Create wxCURSOR_RIGHT_ARROW on the fly from normal arrow cursor under MSW.

[wxWidgets.git] / src / unix / utilsunx.cpp

diff --git a/src/unix/utilsunx.cpp b/src/unix/utilsunx.cpp
index 80c29861c76a4fd3f3720facfd742e6203e64a1b..07a73e52662533ff683f00dd5d382fbe5fecc6d8 100644 (file)
--- a/src/unix/utilsunx.cpp
+++ b/src/unix/utilsunx.cpp
@@ -1,6 +1,6 @@
 /////////////////////////////////////////////////////////////////////////////
 /////////////////////////////////////////////////////////////////////////////

-// Name:        utilsunx.cpp
-// Purpose:     generic Unix implementation of many wx functions
+// Name:        src/unix/utilsunx.cpp
+// Purpose:     generic Unix implementation of many wx functions (for wxBase)

 // Author:      Vadim Zeitlin
 // Id:          $Id$
 // Copyright:   (c) 1998 Robert Roebling, Vadim Zeitlin
 // Author:      Vadim Zeitlin
 // Id:          $Id$
 // Copyright:   (c) 1998 Robert Roebling, Vadim Zeitlin


@@ -15,39 +15,127 @@
 // headers
 // ----------------------------------------------------------------------------
 
 // headers
 // ----------------------------------------------------------------------------
 

-#include "wx/defs.h"
-#include "wx/string.h"
-
-#include "wx/intl.h"
-#include "wx/log.h"
+// for compilers that support precompilation, includes "wx.h".
+#include "wx/wxprec.h"

 
 #include "wx/utils.h"
 
 #include "wx/utils.h"

+
+#define USE_PUTENV (!defined(HAVE_SETENV) && defined(HAVE_PUTENV))
+
+#ifndef WX_PRECOMP
+    #include "wx/string.h"
+    #include "wx/intl.h"
+    #include "wx/log.h"
+    #include "wx/app.h"
+    #include "wx/wxcrtvararg.h"
+    #if USE_PUTENV
+        #include "wx/module.h"
+        #include "wx/hashmap.h"
+    #endif
+#endif
+
+#include "wx/apptrait.h"
+

 #include "wx/process.h"
 #include "wx/process.h"

+#include "wx/thread.h"
+
+#include "wx/cmdline.h"
+
+#include "wx/wfstream.h"

 
 

+#include "wx/private/selectdispatcher.h"
+#include "wx/private/fdiodispatcher.h"

 #include "wx/unix/execute.h"
 #include "wx/unix/execute.h"

+#include "wx/unix/private.h"
+
+#ifdef wxHAS_GENERIC_PROCESS_CALLBACK
+#include "wx/private/fdiodispatcher.h"
+#endif
+
+#include <pwd.h>
+#include <sys/wait.h>       // waitpid()
+
+#ifdef HAVE_SYS_SELECT_H
+#   include <sys/select.h>
+#endif
+
+#define HAS_PIPE_STREAMS (wxUSE_STREAMS && wxUSE_FILE)
+
+#if HAS_PIPE_STREAMS
+
+// define this to let wxexec.cpp know that we know what we're doing
+#define _WX_USED_BY_WXEXECUTE_
+#include "../common/execcmn.cpp"
+
+#endif // HAS_PIPE_STREAMS
+
+// not only the statfs syscall is called differently depending on platform, but
+// one of its incarnations, statvfs(), takes different arguments under
+// different platforms and even different versions of the same system (Solaris
+// 7 and 8): if you want to test for this, don't forget that the problems only
+// appear if the large files support is enabled
+#ifdef HAVE_STATFS
+    #ifdef __BSD__
+        #include <sys/param.h>
+        #include <sys/mount.h>
+    #else // !__BSD__
+        #include <sys/vfs.h>
+    #endif // __BSD__/!__BSD__
+
+    #define wxStatfs statfs
+
+    #ifndef HAVE_STATFS_DECL
+        // some systems lack statfs() prototype in the system headers (AIX 4)
+        extern "C" int statfs(const char *path, struct statfs *buf);
+    #endif
+#endif // HAVE_STATFS
+
+#ifdef HAVE_STATVFS
+    #include <sys/statvfs.h>
+
+    #define wxStatfs statvfs
+#endif // HAVE_STATVFS
+
+#if defined(HAVE_STATFS) || defined(HAVE_STATVFS)
+    // WX_STATFS_T is detected by configure
+    #define wxStatfs_t WX_STATFS_T
+#endif
+
+// SGI signal.h defines signal handler arguments differently depending on
+// whether _LANGUAGE_C_PLUS_PLUS is set or not - do set it
+#if defined(__SGI__) && !defined(_LANGUAGE_C_PLUS_PLUS)
+    #define _LANGUAGE_C_PLUS_PLUS 1
+#endif // SGI hack

 
 #include <stdarg.h>
 #include <dirent.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 
 #include <stdarg.h>
 #include <dirent.h>
 #include <string.h>
 #include <sys/stat.h>
 #include <sys/types.h>

-#include <unistd.h>

 #include <sys/wait.h>
 #include <sys/wait.h>

-#include <pwd.h>
+#include <unistd.h>

 #include <errno.h>
 #include <netdb.h>
 #include <signal.h>
 #include <fcntl.h>          // for O_WRONLY and friends
 #include <time.h>           // nanosleep() and/or usleep()
 #include <ctype.h>          // isspace()
 #include <errno.h>
 #include <netdb.h>
 #include <signal.h>
 #include <fcntl.h>          // for O_WRONLY and friends
 #include <time.h>           // nanosleep() and/or usleep()
 #include <ctype.h>          // isspace()

+#include <sys/time.h>       // needed for FD_SETSIZE

 
 

-// JACS: needed for FD_SETSIZE
-#include <sys/time.h>
-
-#if HAVE_UNAME
+#ifdef HAVE_UNAME

     #include <sys/utsname.h> // for uname()
 #endif // HAVE_UNAME
 
     #include <sys/utsname.h> // for uname()
 #endif // HAVE_UNAME
 

+// Used by wxGetFreeMemory().
+#ifdef __SGI__
+    #include <sys/sysmp.h>
+    #include <sys/sysinfo.h>   // for SAGET and MINFO structures
+#endif
+
+#ifdef HAVE_SETPRIORITY
+    #include <sys/resource.h>   // for setpriority()
+#endif
+

 // ----------------------------------------------------------------------------
 // conditional compilation
 // ----------------------------------------------------------------------------
 // ----------------------------------------------------------------------------
 // conditional compilation
 // ----------------------------------------------------------------------------


@@ -56,28 +144,25 @@
 // headers - please add your system here if it is the case for your OS.
 // SunOS < 5.6 (i.e. Solaris < 2.6) and DG-UX are like this.
 #if !defined(HAVE_USLEEP) && \
 // headers - please add your system here if it is the case for your OS.
 // SunOS < 5.6 (i.e. Solaris < 2.6) and DG-UX are like this.
 #if !defined(HAVE_USLEEP) && \

-    (defined(__SUN__) && !defined(__SunOs_5_6) && \
+    ((defined(__SUN__) && !defined(__SunOs_5_6) && \

                          !defined(__SunOs_5_7) && !defined(__SUNPRO_CC)) || \
                          !defined(__SunOs_5_7) && !defined(__SUNPRO_CC)) || \

-     defined(__osf__) || defined(__EMX__)
+     defined(__osf__) || defined(__EMX__))

     extern "C"
     {
     extern "C"
     {

-        #ifdef __SUN__
-            int usleep(unsigned int usec);
-        #else // !Sun
-       #ifdef __EMX
+        #ifdef __EMX__

             /* I copied this from the XFree86 diffs. AV. */
             #define INCL_DOSPROCESS
             #include <os2.h>
             /* I copied this from the XFree86 diffs. AV. */
             #define INCL_DOSPROCESS
             #include <os2.h>

-            void usleep(unsigned long delay)
+            inline void usleep(unsigned long delay)

             {
                 DosSleep(delay ? (delay/1000l) : 1l);
             }
             {
                 DosSleep(delay ? (delay/1000l) : 1l);
             }

-       #else
-           void usleep(unsigned long usec);
-       #endif
-        #endif // Sun/EMX/Something else
+        #else // Unix
+            int usleep(unsigned int usec);
+        #endif // __EMX__/Unix

     };
     };

-#define HAVE_USLEEP 1
+
+    #define HAVE_USLEEP 1

 #endif // Unices without usleep()
 
 // ============================================================================
 #endif // Unices without usleep()
 
 // ============================================================================


@@ -93,16 +178,16 @@ void wxSleep(int nSecs)
     sleep(nSecs);
 }
 
     sleep(nSecs);
 }
 

-void wxUsleep(unsigned long milliseconds)
+void wxMicroSleep(unsigned long microseconds)

 {
 {

-#if HAVE_NANOSLEEP
+#if defined(HAVE_NANOSLEEP)

     timespec tmReq;
     timespec tmReq;

-    tmReq.tv_sec = milliseconds / 1000;
-    tmReq.tv_nsec = (milliseconds % 1000) * 1000 * 1000;
+    tmReq.tv_sec = (time_t)(microseconds / 1000000);
+    tmReq.tv_nsec = (microseconds % 1000000) * 1000;

 
     // we're not interested in remaining time nor in return value
 
     // we're not interested in remaining time nor in return value

-    (void)nanosleep(&tmReq, (timespec *)NULL);
-#elif HAVE_USLEEP
+    (void)nanosleep(&tmReq, NULL);
+#elif defined(HAVE_USLEEP)

     // uncomment this if you feel brave or if you are sure that your version
     // of Solaris has a safe usleep() function but please notice that usleep()
     // is known to lead to crashes in MT programs in Solaris 2.[67] and is not
     // uncomment this if you feel brave or if you are sure that your version
     // of Solaris has a safe usleep() function but please notice that usleep()
     // is known to lead to crashes in MT programs in Solaris 2.[67] and is not


@@ -111,304 +196,634 @@ void wxUsleep(unsigned long milliseconds)
         #error "usleep() cannot be used in MT programs under Solaris."
     #endif // Sun
 
         #error "usleep() cannot be used in MT programs under Solaris."
     #endif // Sun
 

-    usleep(milliseconds * 1000); // usleep(3) wants microseconds
+    usleep(microseconds);
+#elif defined(HAVE_SLEEP)
+    // under BeOS sleep() takes seconds (what about other platforms, if any?)
+    sleep(microseconds * 1000000);

 #else // !sleep function
 #else // !sleep function

-    #error "usleep() or nanosleep() function required for wxUsleep"
+    #error "usleep() or nanosleep() function required for wxMicroSleep"

 #endif // sleep function
 }
 
 #endif // sleep function
 }
 

+void wxMilliSleep(unsigned long milliseconds)
+{
+    wxMicroSleep(milliseconds*1000);
+}
+

 // ----------------------------------------------------------------------------
 // process management
 // ----------------------------------------------------------------------------
 
 // ----------------------------------------------------------------------------
 // process management
 // ----------------------------------------------------------------------------
 

-int wxKill(long pid, wxSignal sig)
+int wxKill(long pid, wxSignal sig, wxKillError *rc, int flags)

 {
 {

-    return kill(pid, (int)sig);
-}
+    int err = kill((pid_t) (flags & wxKILL_CHILDREN) ? -pid : pid, (int)sig);
+    if ( rc )
+    {
+        switch ( err ? errno : 0 )
+        {
+            case 0:
+                *rc = wxKILL_OK;
+                break;

 
 

-#define WXEXECUTE_NARGS   127
+            case EINVAL:
+                *rc = wxKILL_BAD_SIGNAL;
+                break;

 
 

-long wxExecute( const wxString& command, bool sync, wxProcess *process )
-{
-    wxCHECK_MSG( !command.IsEmpty(), 0, _T("can't exec empty command") );
+            case EPERM:
+                *rc = wxKILL_ACCESS_DENIED;
+                break;

 
 

-    int argc = 0;
-    wxChar *argv[WXEXECUTE_NARGS];
-    wxString argument;
-    const wxChar *cptr = command.c_str();
-    wxChar quotechar = _T('\0'); // is arg quoted?
-    bool escaped = FALSE;
+            case ESRCH:
+                *rc = wxKILL_NO_PROCESS;
+                break;

 
 

-    // split the command line in arguments
-    do
+            default:
+                // this goes against Unix98 docs so log it
+                wxLogDebug(wxT("unexpected kill(2) return value %d"), err);
+
+                // something else...
+                *rc = wxKILL_ERROR;
+        }
+    }
+
+    return err;
+}
+
+// Shutdown or reboot the PC
+bool wxShutdown(int flags)
+{
+    flags &= ~wxSHUTDOWN_FORCE;
+
+    wxChar level;
+    switch ( flags )

     {
     {

-        argument=_T("");
-        quotechar = _T('\0');
+        case wxSHUTDOWN_POWEROFF:
+            level = wxT('0');
+            break;

 
 

-        // eat leading whitespace:
-        while ( wxIsspace(*cptr) )
-            cptr++;
+        case wxSHUTDOWN_REBOOT:
+            level = wxT('6');
+            break;

 
 

-        if ( *cptr == _T('\'') || *cptr == _T('"') )
-            quotechar = *cptr++;
+        case wxSHUTDOWN_LOGOFF:
+            // TODO: use dcop to log off?
+            return false;

 
 

-        do
-        {
-            if ( *cptr == _T('\\') && ! escaped )
-            {
-                escaped = TRUE;
-                cptr++;
-                continue;
-            }
+        default:
+            wxFAIL_MSG( wxT("unknown wxShutdown() flag") );
+            return false;
+    }

 
 

-            // all other characters:
-            argument += *cptr++;
-            escaped = FALSE;
+    return system(wxString::Format("init %c", level).mb_str()) == 0;
+}

 
 

-            // have we reached the end of the argument?
-            if ( (*cptr == quotechar && ! escaped)
-                 || (quotechar == _T('\0') && wxIsspace(*cptr))
-                 || *cptr == _T('\0') )
-            {
-                wxASSERT_MSG( argc < WXEXECUTE_NARGS,
-                              _T("too many arguments in wxExecute") );
+// ----------------------------------------------------------------------------
+// wxStream classes to support IO redirection in wxExecute
+// ----------------------------------------------------------------------------

 
 

-                argv[argc] = new wxChar[argument.length() + 1];
-                wxStrcpy(argv[argc], argument.c_str());
-                argc++;
+#if HAS_PIPE_STREAMS

 
 

-                // if not at end of buffer, swallow last character:
-                if(*cptr)
-                    cptr++;
+bool wxPipeInputStream::CanRead() const
+{
+    if ( m_lasterror == wxSTREAM_EOF )
+        return false;

 
 

-                break; // done with this one, start over
-            }
-        } while(*cptr);
-    } while(*cptr);
-    argv[argc] = NULL;
+    // check if there is any input available
+    struct timeval tv;
+    tv.tv_sec = 0;
+    tv.tv_usec = 0;
+
+    const int fd = m_file->fd();

 
 

-    // do execute the command
-    long lRc = wxExecute(argv, sync, process);
+    fd_set readfds;

 
 

-    // clean up
-    argc = 0;
-    while( argv[argc] )
-        delete [] argv[argc++];
+    wxFD_ZERO(&readfds);
+    wxFD_SET(fd, &readfds);

 
 

-    return lRc;
+    switch ( select(fd + 1, &readfds, NULL, NULL, &tv) )
+    {
+        case -1:
+            wxLogSysError(_("Impossible to get child process input"));
+            // fall through
+
+        case 0:
+            return false;
+
+        default:
+            wxFAIL_MSG(wxT("unexpected select() return value"));
+            // still fall through
+
+        case 1:
+            // input available -- or maybe not, as select() returns 1 when a
+            // read() will complete without delay, but it could still not read
+            // anything
+            return !Eof();
+    }

 }
 
 }
 

-bool wxShell(const wxString& command)
+size_t wxPipeOutputStream::OnSysWrite(const void *buffer, size_t size)
+{
+    // We need to suppress error logging here, because on writing to a pipe
+    // which is full, wxFile::Write reports a system error. However, this is
+    // not an extraordinary situation, and it should not be reported to the
+    // user (but if really needed, the program can recognize it by checking
+    // whether LastRead() == 0.) Other errors will be reported below.
+    size_t ret;
+    {
+        wxLogNull logNo;
+        ret = m_file->Write(buffer, size);
+    }
+
+    switch ( m_file->GetLastError() )
+    {
+       // pipe is full
+#ifdef EAGAIN
+       case EAGAIN:
+#endif
+#if defined(EWOULDBLOCK) && (EWOULDBLOCK != EAGAIN)
+       case EWOULDBLOCK:
+#endif
+           // do not treat it as an error
+           m_file->ClearLastError();
+           // fall through
+
+       // no error
+       case 0:
+           break;
+
+       // some real error
+       default:
+           wxLogSysError(_("Can't write to child process's stdin"));
+           m_lasterror = wxSTREAM_WRITE_ERROR;
+    }
+
+    return ret;
+}
+
+#endif // HAS_PIPE_STREAMS
+
+// ----------------------------------------------------------------------------
+// wxShell
+// ----------------------------------------------------------------------------
+
+static wxString wxMakeShellCommand(const wxString& command)

 {
     wxString cmd;
 {
     wxString cmd;

-    if ( !!command )
-        cmd.Printf(_T("xterm -e %s"), command.c_str());
+    if ( !command )
+    {
+        // just an interactive shell
+        cmd = wxT("xterm");
+    }

     else
     else

-        cmd = command;
+    {
+        // execute command in a shell
+        cmd << wxT("/bin/sh -c '") << command << wxT('\'');
+    }

 
 

-    return wxExecute(cmd) != 0;
+    return cmd;

 }
 
 }
 

-void wxHandleProcessTermination(wxEndProcessData *proc_data)
+bool wxShell(const wxString& command)
+{
+    return wxExecute(wxMakeShellCommand(command), wxEXEC_SYNC) == 0;
+}
+
+bool wxShell(const wxString& command, wxArrayString& output)
+{
+    wxCHECK_MSG( !command.empty(), false, wxT("can't exec shell non interactively") );
+
+    return wxExecute(wxMakeShellCommand(command), output);
+}
+
+namespace

 {
 {

-    int pid = (proc_data->pid > 0) ? proc_data->pid : -(proc_data->pid);

 
 

-    // waitpid is POSIX so should be available everywhere, however on older
-    // systems wait() might be used instead in a loop (until the right pid
-    // terminates)
-    int status = 0;
-    if ( waitpid(pid, &status, 0) == -1 || !WIFEXITED(status) )
+// helper class for storing arguments as char** array suitable for passing to
+// execvp(), whatever form they were passed to us
+class ArgsArray
+{
+public:
+    ArgsArray(const wxArrayString& args)

     {
     {

-        wxLogSysError(_("Waiting for subprocess termination failed"));
+        Init(args.size());
+
+        for ( int i = 0; i < m_argc; i++ )
+        {
+            m_argv[i] = wxStrdup(args[i]);
+        }

     }
     }

-    else
+
+#if wxUSE_UNICODE
+    ArgsArray(wchar_t **wargv)

     {
     {

-        // notify user about termination if required
-        if (proc_data->process)
+        int argc = 0;
+        while ( wargv[argc] )
+            argc++;
+
+        Init(argc);
+
+        for ( int i = 0; i < m_argc; i++ )

         {
         {

-            proc_data->process->OnTerminate(proc_data->pid,
-                                            WEXITSTATUS(status));
+            m_argv[i] = wxSafeConvertWX2MB(wargv[i]).release();

         }
     }
         }
     }

+#endif // wxUSE_UNICODE

 
 

-    // clean up
-    if ( proc_data->pid > 0 )
+    ~ArgsArray()

     {
     {

-        delete proc_data;
+        for ( int i = 0; i < m_argc; i++ )
+        {
+            free(m_argv[i]);
+        }
+
+        delete [] m_argv;

     }
     }

-    else
-    {
-        // wxExecute() will know about it
-        proc_data->exitcode = status;

 
 

-        proc_data->pid = 0;
+    operator char**() const { return m_argv; }
+
+private:
+    void Init(int argc)
+    {
+        m_argc = argc;
+        m_argv = new char *[m_argc + 1];
+        m_argv[m_argc] = NULL;

     }
     }

-}

 
 

-long wxExecute( wxChar **argv, bool sync, wxProcess *process )
+    int m_argc;
+    char **m_argv;
+
+    wxDECLARE_NO_COPY_CLASS(ArgsArray);
+};
+
+} // anonymous namespace
+
+// ----------------------------------------------------------------------------
+// wxExecute implementations
+// ----------------------------------------------------------------------------
+
+#if defined(__DARWIN__)
+bool wxMacLaunch(char **argv);
+#endif
+
+long wxExecute(const wxString& command, int flags, wxProcess *process,
+        const wxExecuteEnv *env)

 {
 {

-    wxCHECK_MSG( *argv, 0, _T("can't exec empty command") );
+    ArgsArray argv(wxCmdLineParser::ConvertStringToArgs(command,
+                                                        wxCMD_LINE_SPLIT_UNIX));
+
+    return wxExecute(argv, flags, process, env);
+}

 
 

-    int end_proc_detect[2];

 #if wxUSE_UNICODE
 #if wxUSE_UNICODE

-    int mb_argc = 0;
-    char *mb_argv[WXEXECUTE_NARGS];

 
 

-    while (argv[mb_argc]) {
-      wxWX2MBbuf mb_arg = wxConvCurrent->cWX2MB(argv[mb_argc]);
-      mb_argv[mb_argc] = strdup(mb_arg);
-      mb_argc++;
+long wxExecute(wchar_t **wargv, int flags, wxProcess *process,
+        const wxExecuteEnv *env)
+{
+    ArgsArray argv(wargv);
+
+    return wxExecute(argv, flags, process, env);
+}
+
+#endif // wxUSE_UNICODE
+
+// wxExecute: the real worker function
+long wxExecute(char **argv, int flags, wxProcess *process,
+        const wxExecuteEnv *env)
+{
+    // for the sync execution, we return -1 to indicate failure, but for async
+    // case we return 0 which is never a valid PID
+    //
+    // we define this as a macro, not a variable, to avoid compiler warnings
+    // about "ERROR_RETURN_CODE value may be clobbered by fork()"
+    #define ERROR_RETURN_CODE ((flags & wxEXEC_SYNC) ? -1 : 0)
+
+    wxCHECK_MSG( *argv, ERROR_RETURN_CODE, wxT("can't exec empty command") );
+
+#if wxUSE_THREADS
+    // fork() doesn't mix well with POSIX threads: on many systems the program
+    // deadlocks or crashes for some reason. Probably our code is buggy and
+    // doesn't do something which must be done to allow this to work, but I
+    // don't know what yet, so for now just warn the user (this is the least we
+    // can do) about it
+    wxASSERT_MSG( wxThread::IsMain(),
+                    wxT("wxExecute() can be called only from the main thread") );
+#endif // wxUSE_THREADS
+
+#if defined(__WXCOCOA__) || ( defined(__WXOSX_MAC__) && wxOSX_USE_COCOA_OR_CARBON )
+    // wxMacLaunch() only executes app bundles and only does it asynchronously.
+    // It returns false if the target is not an app bundle, thus falling
+    // through to the regular code for non app bundles.
+    if ( !(flags & wxEXEC_SYNC) && wxMacLaunch(argv) )
+    {
+        // we don't have any PID to return so just make up something non null
+        return -1;

     }
     }

-    mb_argv[mb_argc] = (char *) NULL;
-#else
-    wxChar **mb_argv = argv;
-#endif
+#endif // __DARWIN__
+
+
+    // this struct contains all information which we use for housekeeping
+    wxExecuteData execData;
+    execData.flags = flags;
+    execData.process = process;

 
     // create pipes
 
     // create pipes

-    if (pipe(end_proc_detect) == -1)
+    if ( !execData.pipeEndProcDetect.Create() )

     {
     {

-        wxLogSysError( _("Pipe creation failed") );
-#if wxUSE_UNICODE
-       mb_argc = 0;
-       while (mb_argv[mb_argc])
-         free(mb_argv[mb_argc++]);
-#endif
-        return 0;
+        wxLogError( _("Failed to execute '%s'\n"), *argv );
+
+        return ERROR_RETURN_CODE;
+    }
+
+    // pipes for inter process communication
+    wxPipe pipeIn,      // stdin
+           pipeOut,     // stdout
+           pipeErr;     // stderr
+
+    if ( process && process->IsRedirected() )
+    {
+        if ( !pipeIn.Create() || !pipeOut.Create() || !pipeErr.Create() )
+        {
+            wxLogError( _("Failed to execute '%s'\n"), *argv );
+
+            return ERROR_RETURN_CODE;
+        }

     }
 
     }
 

+    // priority: we need to map wxWidgets priority which is in the range 0..100
+    // to Unix nice value which is in the range -20..19. As there is an odd
+    // number of elements in our range and an even number in the Unix one, we
+    // have to do it in this rather ugly way to guarantee that:
+    //  1. wxPRIORITY_{MIN,DEFAULT,MAX} map to -20, 0 and 19 respectively.
+    //  2. The mapping is monotonously increasing.
+    //  3. The mapping is onto the target range.
+    int prio = process ? process->GetPriority() : 0;
+    if ( prio <= 50 )
+        prio = (2*prio)/5 - 20;
+    else if ( prio < 55 )
+        prio = 1;
+    else
+        prio = (2*prio)/5 - 21;
+

     // fork the process
     // fork the process

-#if HAVE_VFORK
-    pid_t pid = vfork();
+    //
+    // NB: do *not* use vfork() here, it completely breaks this code for some
+    //     reason under Solaris (and maybe others, although not under Linux)
+    //     But on OpenVMS we do not have fork so we have to use vfork and
+    //     cross our fingers that it works.
+#ifdef __VMS
+   pid_t pid = vfork();

 #else
 #else

-    pid_t pid = fork();
+   pid_t pid = fork();

 #endif
 #endif

-    if (pid == -1)
+   if ( pid == -1 )     // error?

     {
         wxLogSysError( _("Fork failed") );
     {
         wxLogSysError( _("Fork failed") );

-#if wxUSE_UNICODE
-       mb_argc = 0;
-       while (mb_argv[mb_argc])
-         free(mb_argv[mb_argc++]);
-#endif
-        return 0;
+
+        return ERROR_RETURN_CODE;

     }
     }

-    else if (pid == 0)
+    else if ( pid == 0 )  // we're in child

     {
     {

-        // we're in child
-        close(end_proc_detect[0]); // close reading side
+        // NB: we used to close all the unused descriptors of the child here
+        //     but this broke some programs which relied on e.g. FD 1 being
+        //     always opened so don't do it any more, after all there doesn't
+        //     seem to be any real problem with keeping them opened

 
 

-        // These three lines close the open file descriptors to to avoid any
-        // input/output which might block the process or irritate the user. If
-        // one wants proper IO for the subprocess, the right thing to do is
-        // to start an xterm executing it.
-        if (sync == 0)
+#if !defined(__VMS) && !defined(__EMX__)
+        if ( flags & wxEXEC_MAKE_GROUP_LEADER )

         {
         {

-            // leave stderr opened, it won't do any hurm
-            for ( int fd = 0; fd < FD_SETSIZE; fd++ )
+            // Set process group to child process' pid.  Then killing -pid
+            // of the parent will kill the process and all of its children.
+            setsid();
+        }
+#endif // !__VMS
+
+#if defined(HAVE_SETPRIORITY)
+        if ( prio && setpriority(PRIO_PROCESS, 0, prio) != 0 )
+        {
+            wxLogSysError(_("Failed to set process priority"));
+        }
+#endif // HAVE_SETPRIORITY
+
+        // redirect stdin, stdout and stderr
+        if ( pipeIn.IsOk() )
+        {
+            if ( dup2(pipeIn[wxPipe::Read], STDIN_FILENO) == -1 ||
+                 dup2(pipeOut[wxPipe::Write], STDOUT_FILENO) == -1 ||
+                 dup2(pipeErr[wxPipe::Write], STDERR_FILENO) == -1 )

             {
             {

-                if ( fd != end_proc_detect[1] && fd != STDERR_FILENO )
-                    close(fd);
+                wxLogSysError(_("Failed to redirect child process input/output"));

             }
             }

+
+            pipeIn.Close();
+            pipeOut.Close();
+            pipeErr.Close();

         }
 
         }
 

-#if 0
-        close(STDERR_FILENO);
+        // Close all (presumably accidentally) inherited file descriptors to
+        // avoid descriptor leaks. This means that we don't allow inheriting
+        // them purposefully but this seems like a lesser evil in wx code.
+        // Ideally we'd provide some flag to indicate that none (or some?) of
+        // the descriptors do not need to be closed but for now this is better
+        // than never closing them at all as wx code never used FD_CLOEXEC.
+
+        // Note that while the reading side of the end process detection pipe
+        // can be safely closed, we should keep the write one opened, it will
+        // be only closed when the process terminates resulting in a read
+        // notification to the parent
+        const int fdEndProc = execData.pipeEndProcDetect.Detach(wxPipe::Write);
+        execData.pipeEndProcDetect.Close();
+
+        // TODO: Iterating up to FD_SETSIZE is both inefficient (because it may
+        //       be quite big) and incorrect (because in principle we could
+        //       have more opened descriptions than this number). Unfortunately
+        //       there is no good portable solution for closing all descriptors
+        //       above a certain threshold but non-portable solutions exist for
+        //       most platforms, see [http://stackoverflow.com/questions/899038/
+        //          getting-the-highest-allocated-file-descriptor]
+        for ( int fd = 0; fd < (int)FD_SETSIZE; ++fd )
+        {
+            if ( fd != STDIN_FILENO  &&
+                 fd != STDOUT_FILENO &&
+                 fd != STDERR_FILENO &&
+                 fd != fdEndProc )
+            {
+                close(fd);
+            }
+        }

 
 

-        // some programs complain about stderr not being open, so redirect
-        // them:
-        open("/dev/null", O_RDONLY);  // stdin
-        open("/dev/null", O_WRONLY);  // stdout
-        open("/dev/null", O_WRONLY);  // stderr
-#endif

 
 

-        execvp (*mb_argv, mb_argv);
+        // Process additional options if we have any
+        if ( env )
+        {
+            // Change working directory if it is specified
+            if ( !env->cwd.empty() )
+                wxSetWorkingDirectory(env->cwd);
+
+            // Change environment if needed.
+            //
+            // NB: We can't use execve() currently because we allow using
+            //     non full paths to wxExecute(), i.e. we want to search for
+            //     the program in PATH. However it just might be simpler/better
+            //     to do the search manually and use execve() envp parameter to
+            //     set up the environment of the child process explicitly
+            //     instead of doing what we do below.
+            if ( !env->env.empty() )
+            {
+                wxEnvVariableHashMap oldenv;
+                wxGetEnvMap(&oldenv);

 
 

-        // there is no return after successful exec()
-        wxFprintf(stderr, _("Can't execute '%s'\n"), *argv);
+                // Remove unwanted variables
+                wxEnvVariableHashMap::const_iterator it;
+                for ( it = oldenv.begin(); it != oldenv.end(); ++it )
+                {
+                    if ( env->env.find(it->first) == env->env.end() )
+                        wxUnsetEnv(it->first);
+                }
+
+                // And add the new ones (possibly replacing the old values)
+                for ( it = env->env.begin(); it != env->env.end(); ++it )
+                    wxSetEnv(it->first, it->second);
+            }
+        }
+
+        execvp(*argv, argv);
+
+        fprintf(stderr, "execvp(");
+        for ( char **a = argv; *a; a++ )
+            fprintf(stderr, "%s%s", a == argv ? "" : ", ", *a);
+        fprintf(stderr, ") failed with error %d!\n", errno);

 
 

+        // there is no return after successful exec()

         _exit(-1);
         _exit(-1);

+
+        // some compilers complain about missing return - of course, they
+        // should know that exit() doesn't return but what else can we do if
+        // they don't?
+        //
+        // and, sure enough, other compilers complain about unreachable code
+        // after exit() call, so we can just always have return here...
+#if defined(__VMS) || defined(__INTEL_COMPILER)
+        return 0;
+#endif

     }
     }

-    else
+    else // we're in parent

     {
     {

-        // we're in parent
-        close(end_proc_detect[1]); // close writing side
+        // save it for WaitForChild() use
+        execData.pid = pid;
+        if (execData.process)
+            execData.process->SetPid(pid);  // and also in the wxProcess

 
 

-        wxEndProcessData *data = new wxEndProcessData;
-        data->tag = wxAddProcessCallback(data, end_proc_detect[0]);
+        // prepare for IO redirection

 
 

-#if wxUSE_UNICODE
-       mb_argc = 0;
-       while (mb_argv[mb_argc])
-         free(mb_argv[mb_argc++]);
-#endif
+#if HAS_PIPE_STREAMS
+        // the input buffer bufOut is connected to stdout, this is why it is
+        // called bufOut and not bufIn
+        wxStreamTempInputBuffer bufOut,
+                                bufErr;

 
 

-        if ( sync )
+        if ( process && process->IsRedirected() )

         {
         {

-            wxASSERT_MSG( !process, _T("wxProcess param ignored for sync exec") );
-            data->process = NULL;
+            // Avoid deadlocks which could result from trying to write to the
+            // child input pipe end while the child itself is writing to its
+            // output end and waiting for us to read from it.
+            if ( !pipeIn.MakeNonBlocking(wxPipe::Write) )
+            {
+                // This message is not terrible useful for the user but what
+                // else can we do? Also, should we fail here or take the risk
+                // to continue and deadlock? Currently we choose the latter but
+                // it might not be the best idea.
+                wxLogSysError(_("Failed to set up non-blocking pipe, "
+                                "the program might hang."));
+#if wxUSE_LOG
+                wxLog::FlushActive();
+#endif
+            }

 
 

-            // sync execution: indicate it by negating the pid
-            data->pid = -pid;
+            wxOutputStream *inStream =
+                new wxPipeOutputStream(pipeIn.Detach(wxPipe::Write));

 
 

-            // it will be set to 0 from GTK_EndProcessDetector
-            while (data->pid != 0)
-                wxYield();
+            const int fdOut = pipeOut.Detach(wxPipe::Read);
+            wxPipeInputStream *outStream = new wxPipeInputStream(fdOut);

 
 

-            int exitcode = data->exitcode;
+            const int fdErr = pipeErr.Detach(wxPipe::Read);
+            wxPipeInputStream *errStream = new wxPipeInputStream(fdErr);

 
 

-            delete data;
+            process->SetPipeStreams(outStream, inStream, errStream);

 
 

-            return exitcode;
+            bufOut.Init(outStream);
+            bufErr.Init(errStream);
+
+            execData.bufOut = &bufOut;
+            execData.bufErr = &bufErr;
+
+            execData.fdOut = fdOut;
+            execData.fdErr = fdErr;

         }
         }

-        else
-        {
-            // async execution, nothing special to do - caller will be
-            // notified about the process terminationif process != NULL, data
-            // will be deleted in GTK_EndProcessDetector
-            data->process = process;
-            data->pid = pid;
+#endif // HAS_PIPE_STREAMS

 
 

-            return pid;
+        if ( pipeIn.IsOk() )
+        {
+            pipeIn.Close();
+            pipeOut.Close();
+            pipeErr.Close();

         }
         }

+
+        // we want this function to work even if there is no wxApp so ensure
+        // that we have a valid traits pointer
+        wxConsoleAppTraits traitsConsole;
+        wxAppTraits *traits = wxTheApp ? wxTheApp->GetTraits() : NULL;
+        if ( !traits )
+            traits = &traitsConsole;
+
+        return traits->WaitForChild(execData);

     }
     }

+
+#if !defined(__VMS) && !defined(__INTEL_COMPILER)
+    return ERROR_RETURN_CODE;
+#endif

 }
 
 }
 

+#undef ERROR_RETURN_CODE
+

 // ----------------------------------------------------------------------------
 // file and directory functions
 // ----------------------------------------------------------------------------
 
 const wxChar* wxGetHomeDir( wxString *home  )
 {
 // ----------------------------------------------------------------------------
 // file and directory functions
 // ----------------------------------------------------------------------------
 
 const wxChar* wxGetHomeDir( wxString *home  )
 {

-    *home = wxGetUserHome( wxString() );
-    if ( home->IsEmpty() )
-        *home = _T("/");
-
+    *home = wxGetUserHome();
+    wxString tmp;
+    if ( home->empty() )
+        *home = wxT("/");
+#ifdef __VMS
+    tmp = *home;
+    if ( tmp.Last() != wxT(']'))
+        if ( tmp.Last() != wxT('/')) *home << wxT('/');
+#endif

     return home->c_str();
 }
 
     return home->c_str();
 }
 

-#if wxUSE_UNICODE
-const wxMB2WXbuf wxGetUserHome( const wxString &user )
-#else // just for binary compatibility
-char *wxGetUserHome( const wxString &user )
-#endif
+wxString wxGetUserHome( const wxString &user )

 {
     struct passwd *who = (struct passwd *) NULL;
 
     if ( !user )
     {
 {
     struct passwd *who = (struct passwd *) NULL;
 
     if ( !user )
     {

-        register wxChar *ptr;
+        wxChar *ptr;

 
 

-        if ((ptr = wxGetenv(_T("HOME"))) != NULL)
+        if ((ptr = wxGetenv(wxT("HOME"))) != NULL)

         {
             return ptr;
         }
         {
             return ptr;
         }

-        if ((ptr = wxGetenv(_T("USER"))) != NULL || (ptr = wxGetenv(_T("LOGNAME"))) != NULL)
+
+        if ((ptr = wxGetenv(wxT("USER"))) != NULL ||
+             (ptr = wxGetenv(wxT("LOGNAME"))) != NULL)

         {
         {

-            who = getpwnam(wxConvCurrent->cWX2MB(ptr));
+            who = getpwnam(wxSafeConvertWX2MB(ptr));

         }
 
         }
 

-        // We now make sure the the user exists!
-        if (who == NULL)
+        // make sure the user exists!
+        if ( !who )

         {
             who = getpwuid(getuid());
         }
         {
             who = getpwuid(getuid());
         }


@@ -418,25 +833,50 @@ char *wxGetUserHome( const wxString &user )
       who = getpwnam (user.mb_str());
     }
 
       who = getpwnam (user.mb_str());
     }
 

-#if wxUSE_UNICODE
-    return who ? wxConvCurrent->cMB2WX(who->pw_dir) : (wxMB2WXbuf)((wxChar*)NULL);
-#else
-    return who ? who->pw_dir : ((char*)NULL);
-#endif
+    return wxSafeConvertMB2WX(who ? who->pw_dir : 0);

 }
 
 // ----------------------------------------------------------------------------
 // network and user id routines
 // ----------------------------------------------------------------------------
 
 }
 
 // ----------------------------------------------------------------------------
 // network and user id routines
 // ----------------------------------------------------------------------------
 

+// private utility function which returns output of the given command, removing
+// the trailing newline
+static wxString wxGetCommandOutput(const wxString &cmd)
+{
+    FILE *f = popen(cmd.ToAscii(), "r");
+    if ( !f )
+    {
+        wxLogSysError(wxT("Executing \"%s\" failed"), cmd.c_str());
+        return wxEmptyString;
+    }
+
+    wxString s;
+    char buf[256];
+    while ( !feof(f) )
+    {
+        if ( !fgets(buf, sizeof(buf), f) )
+            break;
+
+        s += wxString::FromAscii(buf);
+    }
+
+    pclose(f);
+
+    if ( !s.empty() && s.Last() == wxT('\n') )
+        s.RemoveLast();
+
+    return s;
+}
+

 // retrieve either the hostname or FQDN depending on platform (caller must
 // check whether it's one or the other, this is why this function is for
 // private use only)
 static bool wxGetHostNameInternal(wxChar *buf, int sz)
 {
 // retrieve either the hostname or FQDN depending on platform (caller must
 // check whether it's one or the other, this is why this function is for
 // private use only)
 static bool wxGetHostNameInternal(wxChar *buf, int sz)
 {

-    wxCHECK_MSG( buf, FALSE, _T("NULL pointer in wxGetHostNameInternal") );
+    wxCHECK_MSG( buf, false, wxT("NULL pointer in wxGetHostNameInternal") );

 
 

-    *buf = _T('\0');
+    *buf = wxT('\0');

 
     // we're using uname() which is POSIX instead of less standard sysinfo()
 #if defined(HAVE_UNAME)
 
     // we're using uname() which is POSIX instead of less standard sysinfo()
 #if defined(HAVE_UNAME)


@@ -444,15 +884,19 @@ static bool wxGetHostNameInternal(wxChar *buf, int sz)
     bool ok = uname(&uts) != -1;
     if ( ok )
     {
     bool ok = uname(&uts) != -1;
     if ( ok )
     {

-        wxStrncpy(buf, wxConvCurrent->cMB2WX(uts.nodename), sz - 1);
-        buf[sz] = _T('\0');
+        wxStrlcpy(buf, wxSafeConvertMB2WX(uts.nodename), sz);

     }
 #elif defined(HAVE_GETHOSTNAME)
     }
 #elif defined(HAVE_GETHOSTNAME)

-    bool ok = gethostname(buf, sz) != -1;
+    char cbuf[sz];
+    bool ok = gethostname(cbuf, sz) != -1;
+    if ( ok )
+    {
+        wxStrlcpy(buf, wxSafeConvertMB2WX(cbuf), sz);
+    }

 #else // no uname, no gethostname
 #else // no uname, no gethostname

-    wxFAIL_MSG(_T("don't know host name for this machine"));
+    wxFAIL_MSG(wxT("don't know host name for this machine"));

 
 

-    bool ok = FALSE;
+    bool ok = false;

 #endif // uname/gethostname
 
     if ( !ok )
 #endif // uname/gethostname
 
     if ( !ok )


@@ -471,11 +915,11 @@ bool wxGetHostName(wxChar *buf, int sz)
     {
         // BSD systems return the FQDN, we only want the hostname, so extract
         // it (we consider that dots are domain separators)
     {
         // BSD systems return the FQDN, we only want the hostname, so extract
         // it (we consider that dots are domain separators)

-        wxChar *dot = wxStrchr(buf, _T('.'));
+        wxChar *dot = wxStrchr(buf, wxT('.'));

         if ( dot )
         {
             // nuke it
         if ( dot )
         {
             // nuke it

-            *dot = _T('\0');
+            *dot = wxT('\0');

         }
     }
 
         }
     }
 


@@ -488,19 +932,19 @@ bool wxGetFullHostName(wxChar *buf, int sz)
 
     if ( ok )
     {
 
     if ( ok )
     {

-        if ( !wxStrchr(buf, _T('.')) )
+        if ( !wxStrchr(buf, wxT('.')) )

         {
         {

-            struct hostent *host = gethostbyname(wxConvCurrent->cWX2MB(buf));
+            struct hostent *host = gethostbyname(wxSafeConvertWX2MB(buf));

             if ( !host )
             {
                 wxLogSysError(_("Cannot get the official hostname"));
 
             if ( !host )
             {
                 wxLogSysError(_("Cannot get the official hostname"));
 

-                ok = FALSE;
+                ok = false;

             }
             else
             {
                 // the canonical name
             }
             else
             {
                 // the canonical name

-                wxStrncpy(buf, wxConvCurrent->cMB2WX(host->h_name), sz);
+                wxStrlcpy(buf, wxSafeConvertMB2WX(host->h_name), sz);

             }
         }
         //else: it's already a FQDN (BSD behaves this way)
             }
         }
         //else: it's already a FQDN (BSD behaves this way)


@@ -513,305 +957,643 @@ bool wxGetUserId(wxChar *buf, int sz)
 {
     struct passwd *who;
 
 {
     struct passwd *who;
 

-    *buf = _T('\0');
+    *buf = wxT('\0');

     if ((who = getpwuid(getuid ())) != NULL)
     {
     if ((who = getpwuid(getuid ())) != NULL)
     {

-        wxStrncpy (buf, wxConvCurrent->cMB2WX(who->pw_name), sz - 1);
-        return TRUE;
+        wxStrlcpy (buf, wxSafeConvertMB2WX(who->pw_name), sz);
+        return true;

     }
 
     }
 

-    return FALSE;
+    return false;

 }
 
 bool wxGetUserName(wxChar *buf, int sz)
 {
 }
 
 bool wxGetUserName(wxChar *buf, int sz)
 {

+#ifdef HAVE_PW_GECOS

     struct passwd *who;
     struct passwd *who;

-    char *comma;

 
 

-    *buf = _T('\0');
-    if ((who = getpwuid (getuid ())) != NULL) {
-       comma = strchr(who->pw_gecos, ',');
+    *buf = wxT('\0');
+    if ((who = getpwuid (getuid ())) != NULL)
+    {
+       char *comma = strchr(who->pw_gecos, ',');

        if (comma)
            *comma = '\0'; // cut off non-name comment fields
        if (comma)
            *comma = '\0'; // cut off non-name comment fields

-       wxStrncpy (buf, wxConvCurrent->cMB2WX(who->pw_gecos), sz - 1);
-       return TRUE;
+       wxStrlcpy(buf, wxSafeConvertMB2WX(who->pw_gecos), sz);
+       return true;

     }
 
     }
 

-    return FALSE;
+    return false;
+#else // !HAVE_PW_GECOS
+    return wxGetUserId(buf, sz);
+#endif // HAVE_PW_GECOS/!HAVE_PW_GECOS

 }
 
 }
 

-// ----------------------------------------------------------------------------
-// error and debug output routines (deprecated, use wxLog)
-// ----------------------------------------------------------------------------
+bool wxIsPlatform64Bit()
+{
+    const wxString machine = wxGetCommandOutput(wxT("uname -m"));

 
 

-void wxDebugMsg( const char *format, ... )
+    // the test for "64" is obviously not 100% reliable but seems to work fine
+    // in practice
+    return machine.Contains(wxT("64")) ||
+                machine.Contains(wxT("alpha"));
+}
+
+#ifdef __LINUX__
+wxLinuxDistributionInfo wxGetLinuxDistributionInfo()

 {
 {

-  va_list ap;
-  va_start( ap, format );
-  vfprintf( stderr, format, ap );
-  fflush( stderr );
-  va_end(ap);
+    const wxString id = wxGetCommandOutput(wxT("lsb_release --id"));
+    const wxString desc = wxGetCommandOutput(wxT("lsb_release --description"));
+    const wxString rel = wxGetCommandOutput(wxT("lsb_release --release"));
+    const wxString codename = wxGetCommandOutput(wxT("lsb_release --codename"));
+
+    wxLinuxDistributionInfo ret;
+
+    id.StartsWith("Distributor ID:\t", &ret.Id);
+    desc.StartsWith("Description:\t", &ret.Description);
+    rel.StartsWith("Release:\t", &ret.Release);
+    codename.StartsWith("Codename:\t", &ret.CodeName);
+
+    return ret;

 }
 }

+#endif

 
 

-void wxError( const wxString &msg, const wxString &title )
+// these functions are in src/osx/utilsexc_base.cpp for wxMac
+#ifndef __DARWIN__
+
+wxOperatingSystemId wxGetOsVersion(int *verMaj, int *verMin)

 {
 {

-  wxFprintf( stderr, _("Error ") );
-  if (!title.IsNull()) wxFprintf( stderr, _T("%s "), WXSTRINGCAST(title) );
-  if (!msg.IsNull()) wxFprintf( stderr, _T(": %s"), WXSTRINGCAST(msg) );
-  wxFprintf( stderr, _T(".\n") );
+    // get OS version
+    int major, minor;
+    wxString release = wxGetCommandOutput(wxT("uname -r"));
+    if ( release.empty() ||
+         wxSscanf(release.c_str(), wxT("%d.%d"), &major, &minor) != 2 )
+    {
+        // failed to get version string or unrecognized format
+        major =
+        minor = -1;
+    }
+
+    if ( verMaj )
+        *verMaj = major;
+    if ( verMin )
+        *verMin = minor;
+
+    // try to understand which OS are we running
+    wxString kernel = wxGetCommandOutput(wxT("uname -s"));
+    if ( kernel.empty() )
+        kernel = wxGetCommandOutput(wxT("uname -o"));
+
+    if ( kernel.empty() )
+        return wxOS_UNKNOWN;
+
+    return wxPlatformInfo::GetOperatingSystemId(kernel);

 }
 
 }
 

-void wxFatalError( const wxString &msg, const wxString &title )
+wxString wxGetOsDescription()

 {
 {

-  wxFprintf( stderr, _("Error ") );
-  if (!title.IsNull()) wxFprintf( stderr, _T("%s "), WXSTRINGCAST(title) );
-  if (!msg.IsNull()) wxFprintf( stderr, _T(": %s"), WXSTRINGCAST(msg) );
-  wxFprintf( stderr, _T(".\n") );
-  exit(3); // the same exit code as for abort()
+    return wxGetCommandOutput(wxT("uname -s -r -m"));

 }
 
 }
 

-// ----------------------------------------------------------------------------
-// font-related functions
-// ----------------------------------------------------------------------------
+#endif // !__DARWIN__

 
 

-// define the functions to create and destroy native fonts for this toolkit
-#ifdef __X__
-    static inline wxNativeFont wxLoadFont(const wxString& fontSpec)
+unsigned long wxGetProcessId()
+{
+    return (unsigned long)getpid();
+}
+
+wxMemorySize wxGetFreeMemory()
+{
+#if defined(__LINUX__)
+    // get it from /proc/meminfo
+    FILE *fp = fopen("/proc/meminfo", "r");
+    if ( fp )

     {
     {

-        return XLoadQueryFont((Display *)wxGetDisplay(), fontSpec);
+        long memFree = -1;
+
+        char buf[1024];
+        if ( fgets(buf, WXSIZEOF(buf), fp) && fgets(buf, WXSIZEOF(buf), fp) )
+        {
+            // /proc/meminfo changed its format in kernel 2.6
+            if ( wxPlatformInfo().CheckOSVersion(2, 6) )
+            {
+                unsigned long cached, buffers;
+                sscanf(buf, "MemFree: %ld", &memFree);
+
+                fgets(buf, WXSIZEOF(buf), fp);
+                sscanf(buf, "Buffers: %lu", &buffers);
+
+                fgets(buf, WXSIZEOF(buf), fp);
+                sscanf(buf, "Cached: %lu", &cached);
+
+                // add to "MemFree" also the "Buffers" and "Cached" values as
+                // free(1) does as otherwise the value never makes sense: for
+                // kernel 2.6 it's always almost 0
+                memFree += buffers + cached;
+
+                // values here are always expressed in kB and we want bytes
+                memFree *= 1024;
+            }
+            else // Linux 2.4 (or < 2.6, anyhow)
+            {
+                long memTotal, memUsed;
+                sscanf(buf, "Mem: %ld %ld %ld", &memTotal, &memUsed, &memFree);
+            }
+        }
+
+        fclose(fp);
+
+        return (wxMemorySize)memFree;

     }
     }

+#elif defined(__SGI__)
+    struct rminfo realmem;
+    if ( sysmp(MP_SAGET, MPSA_RMINFO, &realmem, sizeof realmem) == 0 )
+        return ((wxMemorySize)realmem.physmem * sysconf(_SC_PAGESIZE));
+#elif defined(_SC_AVPHYS_PAGES)
+    return ((wxMemorySize)sysconf(_SC_AVPHYS_PAGES))*sysconf(_SC_PAGESIZE);
+//#elif defined(__FREEBSD__) -- might use sysctl() to find it out, probably
+#endif
+
+    // can't find it out
+    return -1;
+}

 
 

-    static inline void wxFreeFont(wxNativeFont font)
+bool wxGetDiskSpace(const wxString& path, wxDiskspaceSize_t *pTotal, wxDiskspaceSize_t *pFree)
+{
+#if defined(HAVE_STATFS) || defined(HAVE_STATVFS)
+    // the case to "char *" is needed for AIX 4.3
+    wxStatfs_t fs;
+    if ( wxStatfs((char *)(const char*)path.fn_str(), &fs) != 0 )

     {
     {

-        XFreeFont((Display *)wxGetDisplay(), font);
+        wxLogSysError( wxT("Failed to get file system statistics") );
+
+        return false;

     }
     }

-#elif defined(__WXGTK__)
-    static inline wxNativeFont wxLoadFont(const wxString& fontSpec)
+
+    // under Solaris we also have to use f_frsize field instead of f_bsize
+    // which is in general a multiple of f_frsize
+#ifdef HAVE_STATVFS
+    wxDiskspaceSize_t blockSize = fs.f_frsize;
+#else // HAVE_STATFS
+    wxDiskspaceSize_t blockSize = fs.f_bsize;
+#endif // HAVE_STATVFS/HAVE_STATFS
+
+    if ( pTotal )

     {
     {

-        return gdk_font_load( wxConvCurrent->cWX2MB(fontSpec) );
+        *pTotal = wxDiskspaceSize_t(fs.f_blocks) * blockSize;

     }
 
     }
 

-    static inline void wxFreeFont(wxNativeFont font)
+    if ( pFree )

     {
     {

-        gdk_font_unref(font);
+        *pFree = wxDiskspaceSize_t(fs.f_bavail) * blockSize;

     }
     }

-#else
-    #error "Unknown GUI toolkit"
-#endif

 
 

-// returns TRUE if there are any fonts matching this font spec
-static bool wxTestFontSpec(const wxString& fontspec)
+    return true;
+#else // !HAVE_STATFS && !HAVE_STATVFS
+    return false;
+#endif // HAVE_STATFS
+}
+
+// ----------------------------------------------------------------------------
+// env vars
+// ----------------------------------------------------------------------------
+
+#if USE_PUTENV
+
+WX_DECLARE_STRING_HASH_MAP(char *, wxEnvVars);
+
+static wxEnvVars gs_envVars;
+
+class wxSetEnvModule : public wxModule

 {
 {

-    wxNativeFont test = wxLoadFont(fontspec);
-    if ( test )
+public:
+    virtual bool OnInit() { return true; }
+    virtual void OnExit()

     {
     {

-        wxFreeFont(test);
+        for ( wxEnvVars::const_iterator i = gs_envVars.begin();
+              i != gs_envVars.end();
+              ++i )
+        {
+            free(i->second);
+        }

 
 

-        return TRUE;
+        gs_envVars.clear();

     }
     }

-    else
+
+    DECLARE_DYNAMIC_CLASS(wxSetEnvModule)
+};
+
+IMPLEMENT_DYNAMIC_CLASS(wxSetEnvModule, wxModule)
+
+#endif // USE_PUTENV
+
+bool wxGetEnv(const wxString& var, wxString *value)
+{
+    // wxGetenv is defined as getenv()
+    char *p = wxGetenv(var);
+    if ( !p )
+        return false;
+
+    if ( value )

     {
     {

-        return FALSE;
+        *value = p;

     }
     }

+
+    return true;

 }
 
 }
 

-// TODO encoding test logic should be moved to wxLoadQueryNearestFont()
-static wxNativeFont wxLoadQueryFont(int pointSize,
-                                    int family,
-                                    int style,
-                                    int weight,
-                                    bool WXUNUSED(underlined),
-                                    const wxString &facename,
-                                    wxFontEncoding encoding )
+static bool wxDoSetEnv(const wxString& variable, const char *value)
+{
+#if defined(HAVE_SETENV)
+    if ( !value )
+    {
+#ifdef HAVE_UNSETENV
+        // don't test unsetenv() return value: it's void on some systems (at
+        // least Darwin)
+        unsetenv(variable.mb_str());
+        return true;
+#else
+        value = ""; // we can't pass NULL to setenv()
+#endif
+    }
+
+    return setenv(variable.mb_str(), value, 1 /* overwrite */) == 0;
+#elif defined(HAVE_PUTENV)
+    wxString s = variable;
+    if ( value )
+        s << wxT('=') << value;
+
+    // transform to ANSI
+    const wxWX2MBbuf p = s.mb_str();
+
+    char *buf = (char *)malloc(strlen(p) + 1);
+    strcpy(buf, p);
+
+    // store the string to free() it later
+    wxEnvVars::iterator i = gs_envVars.find(variable);
+    if ( i != gs_envVars.end() )
+    {
+        free(i->second);
+        i->second = buf;
+    }
+    else // this variable hadn't been set before
+    {
+        gs_envVars[variable] = buf;
+    }
+
+    return putenv(buf) == 0;
+#else // no way to set an env var
+    return false;
+#endif
+}
+
+bool wxSetEnv(const wxString& variable, const wxString& value)
+{
+    return wxDoSetEnv(variable, value.mb_str());
+}
+
+bool wxUnsetEnv(const wxString& variable)
+{
+    return wxDoSetEnv(variable, NULL);
+}
+
+// ----------------------------------------------------------------------------
+// signal handling
+// ----------------------------------------------------------------------------
+
+#if wxUSE_ON_FATAL_EXCEPTION
+
+#include <signal.h>
+
+extern "C" void wxFatalSignalHandler(wxTYPE_SA_HANDLER)

 {
 {

-    wxString xfamily;
-    switch (family)
+    if ( wxTheApp )

     {
     {

-        case wxDECORATIVE: xfamily = _T("lucida"); break;
-        case wxROMAN:      xfamily = _T("times");  break;
-        case wxMODERN:     xfamily = _T("courier"); break;
-        case wxSWISS:      xfamily = _T("helvetica"); break;
-        case wxTELETYPE:   xfamily = _T("lucidatypewriter"); break;
-        case wxSCRIPT:     xfamily = _T("utopia"); break;
-        default:           xfamily = _T("*");
+        // give the user a chance to do something special about this
+        wxTheApp->OnFatalException();

     }
 
     }
 

-    wxString fontSpec;
-    if (!facename.IsEmpty())
+    abort();
+}
+
+bool wxHandleFatalExceptions(bool doit)
+{
+    // old sig handlers
+    static bool s_savedHandlers = false;
+    static struct sigaction s_handlerFPE,
+                            s_handlerILL,
+                            s_handlerBUS,
+                            s_handlerSEGV;
+
+    bool ok = true;
+    if ( doit && !s_savedHandlers )

     {
     {

-        fontSpec.Printf(_T("-*-%s-*-*-normal-*-*-*-*-*-*-*-*-*"),
-                        facename.c_str());
+        // install the signal handler
+        struct sigaction act;
+
+        // some systems extend it with non std fields, so zero everything
+        memset(&act, 0, sizeof(act));
+
+        act.sa_handler = wxFatalSignalHandler;
+        sigemptyset(&act.sa_mask);
+        act.sa_flags = 0;

 
 

-        if ( wxTestFontSpec(fontSpec) )
+        ok &= sigaction(SIGFPE, &act, &s_handlerFPE) == 0;
+        ok &= sigaction(SIGILL, &act, &s_handlerILL) == 0;
+        ok &= sigaction(SIGBUS, &act, &s_handlerBUS) == 0;
+        ok &= sigaction(SIGSEGV, &act, &s_handlerSEGV) == 0;
+        if ( !ok )

         {
         {

-            xfamily = facename;
+            wxLogDebug(wxT("Failed to install our signal handler."));

         }
         }

-        //else: no such family, use default one instead
+
+        s_savedHandlers = true;
+    }
+    else if ( s_savedHandlers )
+    {
+        // uninstall the signal handler
+        ok &= sigaction(SIGFPE, &s_handlerFPE, NULL) == 0;
+        ok &= sigaction(SIGILL, &s_handlerILL, NULL) == 0;
+        ok &= sigaction(SIGBUS, &s_handlerBUS, NULL) == 0;
+        ok &= sigaction(SIGSEGV, &s_handlerSEGV, NULL) == 0;
+        if ( !ok )
+        {
+            wxLogDebug(wxT("Failed to uninstall our signal handler."));
+        }
+
+        s_savedHandlers = false;

     }
     }

+    //else: nothing to do
+
+    return ok;
+}
+
+#endif // wxUSE_ON_FATAL_EXCEPTION
+
+// ----------------------------------------------------------------------------
+// wxExecute support
+// ----------------------------------------------------------------------------
+
+int wxAppTraits::AddProcessCallback(wxEndProcessData *data, int fd)
+{
+    // define a custom handler processing only the closure of the descriptor
+    struct wxEndProcessFDIOHandler : public wxFDIOHandler
+    {
+        wxEndProcessFDIOHandler(wxEndProcessData *data, int fd)
+            : m_data(data), m_fd(fd)
+        {
+        }
+
+        virtual void OnReadWaiting()
+        {
+            wxFDIODispatcher::Get()->UnregisterFD(m_fd);
+            close(m_fd);
+
+            wxHandleProcessTermination(m_data);
+
+            delete this;
+        }
+
+        virtual void OnWriteWaiting() { wxFAIL_MSG("unreachable"); }
+        virtual void OnExceptionWaiting() { wxFAIL_MSG("unreachable"); }
+
+        wxEndProcessData * const m_data;
+        const int m_fd;
+    };
+
+    wxFDIODispatcher::Get()->RegisterFD
+                             (
+                                 fd,
+                                 new wxEndProcessFDIOHandler(data, fd),
+                                 wxFDIO_INPUT
+                             );
+    return fd; // unused, but return something unique for the tag
+}
+
+bool wxAppTraits::CheckForRedirectedIO(wxExecuteData& execData)
+{
+#if HAS_PIPE_STREAMS
+    bool hasIO = false;
+
+    if ( execData.bufOut && execData.bufOut->Update() )
+        hasIO = true;
+
+    if ( execData.bufErr && execData.bufErr->Update() )
+        hasIO = true;

 
 

-    wxString xstyle;
-    switch (style)
+    return hasIO;
+#else // !HAS_PIPE_STREAMS
+    wxUnusedVar(execData);
+
+    return false;
+#endif // HAS_PIPE_STREAMS/!HAS_PIPE_STREAMS
+}
+
+// helper classes/functions used by WaitForChild()
+namespace
+{
+
+// convenient base class for IO handlers which are registered for read
+// notifications only and which also stores the FD we're reading from
+//
+// the derived classes still have to implement OnReadWaiting()
+class wxReadFDIOHandler : public wxFDIOHandler
+{
+public:
+    wxReadFDIOHandler(wxFDIODispatcher& disp, int fd) : m_fd(fd)

     {
     {

-        case wxITALIC:     xstyle = _T("i"); break;
-        case wxSLANT:      xstyle = _T("o"); break;
-        case wxNORMAL:     xstyle = _T("r"); break;
-        default:           xstyle = _T("*"); break;
+        if ( fd )
+            disp.RegisterFD(fd, this, wxFDIO_INPUT);

     }
 
     }
 

-    wxString xweight;
-    switch (weight)
+    virtual void OnWriteWaiting() { wxFAIL_MSG("unreachable"); }
+    virtual void OnExceptionWaiting() { wxFAIL_MSG("unreachable"); }
+
+protected:
+    const int m_fd;
+
+    wxDECLARE_NO_COPY_CLASS(wxReadFDIOHandler);
+};
+
+// class for monitoring our end of the process detection pipe, simply sets a
+// flag when input on the pipe (which must be due to EOF) is detected
+class wxEndHandler : public wxReadFDIOHandler
+{
+public:
+    wxEndHandler(wxFDIODispatcher& disp, int fd)
+        : wxReadFDIOHandler(disp, fd)

     {
     {

-        case wxBOLD:       xweight = _T("bold"); break;
-        case wxLIGHT:
-        case wxNORMAL:     xweight = _T("medium"); break;
-        default:           xweight = _T("*"); break;
+        m_terminated = false;

     }
 
     }
 

-    wxString xregistry, xencoding;
-    if ( encoding == wxFONTENCODING_DEFAULT )
+    bool Terminated() const { return m_terminated; }
+
+    virtual void OnReadWaiting() { m_terminated = true; }
+
+private:
+    bool m_terminated;
+
+    wxDECLARE_NO_COPY_CLASS(wxEndHandler);
+};
+
+#if HAS_PIPE_STREAMS
+
+// class for monitoring our ends of child stdout/err, should be constructed
+// with the FD and stream from wxExecuteData and will do nothing if they're
+// invalid
+//
+// unlike wxEndHandler this class registers itself with the provided dispatcher
+class wxRedirectedIOHandler : public wxReadFDIOHandler
+{
+public:
+    wxRedirectedIOHandler(wxFDIODispatcher& disp,
+                          int fd,
+                          wxStreamTempInputBuffer *buf)
+        : wxReadFDIOHandler(disp, fd),
+          m_buf(buf)

     {
     {

-        // use the apps default
-        encoding = wxFont::GetDefaultEncoding();

     }
 
     }
 

-    bool test = TRUE;   // should we test for availability of encoding?
-    switch ( encoding )
+    virtual void OnReadWaiting()

     {
     {

-        case wxFONTENCODING_ISO8859_1:
-        case wxFONTENCODING_ISO8859_2:
-        case wxFONTENCODING_ISO8859_3:
-        case wxFONTENCODING_ISO8859_4:
-        case wxFONTENCODING_ISO8859_5:
-        case wxFONTENCODING_ISO8859_6:
-        case wxFONTENCODING_ISO8859_7:
-        case wxFONTENCODING_ISO8859_8:
-        case wxFONTENCODING_ISO8859_9:
-        case wxFONTENCODING_ISO8859_10:
-        case wxFONTENCODING_ISO8859_11:
-        case wxFONTENCODING_ISO8859_13:
-        case wxFONTENCODING_ISO8859_14:
-        case wxFONTENCODING_ISO8859_15:
-            {
-                int cp = encoding - wxFONTENCODING_ISO8859_1 + 1;
-                xregistry = _T("iso8859");
-                xencoding.Printf(_T("%d"), cp);
-            }
-            break;
+        m_buf->Update();
+    }

 
 

-        case wxFONTENCODING_KOI8:
-            xregistry = _T("koi8");
-            if ( wxTestFontSpec(_T("-*-*-*-*-*-*-*-*-*-*-*-*-koi8-1")) )
-            {
-                xencoding = _T("1");
+private:
+    wxStreamTempInputBuffer * const m_buf;

 
 

-                // test passed, no need to do it once more
-                test = FALSE;
-            }
-            else
-            {
-                xencoding = _T("*");
-            }
-            break;
+    wxDECLARE_NO_COPY_CLASS(wxRedirectedIOHandler);
+};

 
 

-        case wxFONTENCODING_CP1250:
-        case wxFONTENCODING_CP1251:
-        case wxFONTENCODING_CP1252:
-            {
-                int cp = encoding - wxFONTENCODING_CP1250 + 1250;
-                fontSpec.Printf(_T("-*-*-*-*-*-*-*-*-*-*-*-*-microsoft-cp%d"),
-                                cp);
-                if ( wxTestFontSpec(fontSpec) )
-                {
-                    xregistry = _T("microsoft");
-                    xencoding.Printf(_T("cp%d"), cp);
+#endif // HAS_PIPE_STREAMS

 
 

-                    // test passed, no need to do it once more
-                    test = FALSE;
-                }
-                else
-                {
-                    // fall back to LatinX
-                    xregistry = _T("iso8859");
-                    xencoding.Printf(_T("%d"), cp - 1249);
-                }
-            }
-            break;
+// helper function which calls waitpid() and analyzes the result
+int DoWaitForChild(int pid, int flags = 0)
+{
+    wxASSERT_MSG( pid > 0, "invalid PID" );

 
 

-        case wxFONTENCODING_SYSTEM:
-        default:
-            test = FALSE;
-            xregistry =
-            xencoding = _T("*");
+    int status, rc;
+
+    // loop while we're getting EINTR
+    for ( ;; )
+    {
+        rc = waitpid(pid, &status, flags);
+
+        if ( rc != -1 || errno != EINTR )
+            break;

     }
 
     }
 

-    if ( test )
+    if ( rc == 0 )

     {
     {

-        fontSpec.Printf(_T("-*-*-*-*-*-*-*-*-*-*-*-*-%s-%s"),
-                        xregistry.c_str(), xencoding.c_str());
-        if ( !wxTestFontSpec(fontSpec) )
+        // This can only happen if the child application closes our dummy pipe
+        // that is used to monitor its lifetime; in that case, our best bet is
+        // to pretend the process did terminate, because otherwise wxExecute()
+        // would hang indefinitely (OnReadWaiting() won't be called again, the
+        // descriptor is closed now).
+        wxLogDebug("Child process (PID %d) still alive but pipe closed so "
+                   "generating a close notification", pid);
+    }
+    else if ( rc == -1 )
+    {
+        wxLogLastError(wxString::Format("waitpid(%d)", pid));
+    }
+    else // child did terminate
+    {
+        wxASSERT_MSG( rc == pid, "unexpected waitpid() return value" );
+
+        // notice that the caller expects the exit code to be signed, e.g. -1
+        // instead of 255 so don't assign WEXITSTATUS() to an int
+        signed char exitcode;
+        if ( WIFEXITED(status) )
+            exitcode = WEXITSTATUS(status);
+        else if ( WIFSIGNALED(status) )
+            exitcode = -WTERMSIG(status);
+        else

         {
         {

-            // this encoding isn't available - what to do?
-            xregistry =
-            xencoding = _T("*");
+            wxLogError("Child process (PID %d) exited for unknown reason, "
+                       "status = %d", pid, status);
+            exitcode = -1;

         }
         }

-    }

 
 

-    // construct the X font spec from our data
-    fontSpec.Printf(_T("-*-%s-%s-%s-normal-*-*-%d-*-*-*-*-%s-%s"),
-                    xfamily.c_str(), xweight.c_str(), xstyle.c_str(),
-                    pointSize, xregistry.c_str(), xencoding.c_str());
+        return exitcode;
+    }

 
 

-    return wxLoadFont(fontSpec);
+    return -1;

 }
 
 }
 

-wxNativeFont wxLoadQueryNearestFont(int pointSize,
-                                    int family,
-                                    int style,
-                                    int weight,
-                                    bool underlined,
-                                    const wxString &facename,
-                                    wxFontEncoding encoding)
+} // anonymous namespace
+
+int wxAppTraits::WaitForChild(wxExecuteData& execData)

 {
 {

-    wxNativeFont font = wxLoadQueryFont( pointSize, family, style, weight,
-                                         underlined, facename, encoding );
+    if ( !(execData.flags & wxEXEC_SYNC) )
+    {
+        // asynchronous execution: just launch the process and return,
+        // endProcData will be destroyed when it terminates (currently we leak
+        // it if the process doesn't terminate before we do and this should be
+        // fixed but it's not a real leak so it's not really very high
+        // priority)
+        wxEndProcessData *endProcData = new wxEndProcessData;
+        endProcData->process = execData.process;
+        endProcData->pid = execData.pid;
+        endProcData->tag = AddProcessCallback
+                           (
+                             endProcData,
+                             execData.GetEndProcReadFD()
+                           );
+        endProcData->async = true;
+
+        return execData.pid;
+    }
+    //else: synchronous execution case

 
 

-    if (!font)
+#if HAS_PIPE_STREAMS && wxUSE_SOCKETS
+    wxProcess * const process = execData.process;
+    if ( process && process->IsRedirected() )

     {
     {

-        // search up and down by stepsize 10
-        int max_size = pointSize + 20 * (1 + (pointSize/180));
-        int min_size = pointSize - 20 * (1 + (pointSize/180));
+        // we can't simply block waiting for the child to terminate as we would
+        // dead lock if it writes more than the pipe buffer size (typically
+        // 4KB) bytes of output -- it would then block waiting for us to read
+        // the data while we'd block waiting for it to terminate
+        //
+        // so multiplex here waiting for any input from the child or closure of
+        // the pipe used to indicate its termination
+        wxSelectDispatcher disp;

 
 

-        int i;
+        wxEndHandler endHandler(disp, execData.GetEndProcReadFD());

 
 

-        // Search for smaller size (approx.)
-        for ( i = pointSize - 10; !font && i >= 10 && i >= min_size; i -= 10 )
-        {
-            font = wxLoadQueryFont(i, family, style, weight, underlined,
-                                   facename, encoding );
-        }
+        wxRedirectedIOHandler outHandler(disp, execData.fdOut, execData.bufOut),
+                              errHandler(disp, execData.fdErr, execData.bufErr);

 
 

-        // Search for larger size (approx.)
-        for ( i = pointSize + 10; !font && i <= max_size; i += 10 )
+        while ( !endHandler.Terminated() )

         {
         {

-            font = wxLoadQueryFont( i, family, style, weight, underlined,
-                                    facename, encoding );
+            disp.Dispatch();

         }
         }

+    }
+    //else: no IO redirection, just block waiting for the child to exit
+#endif // HAS_PIPE_STREAMS

 
 

-        // Try default family
-        if ( !font && family != wxDEFAULT )
-        {
-            font = wxLoadQueryFont( pointSize, wxDEFAULT, style, weight,
-                                    underlined, facename, encoding );
-        }
+    return DoWaitForChild(execData.pid);
+}

 
 

-        // Bogus font
-        if ( !font )
-        {
-            font = wxLoadQueryFont(120, wxDEFAULT, wxNORMAL, wxNORMAL,
-                                   underlined, facename, encoding );
-        }
+void wxHandleProcessTermination(wxEndProcessData *data)
+{
+    data->exitcode = DoWaitForChild(data->pid, WNOHANG);
+
+    // notify user about termination if required
+    if ( data->process )
+    {
+        data->process->OnTerminate(data->pid, data->exitcode);

     }
 
     }
 

-    return font;
+    if ( data->async )
+    {
+        // in case of asynchronous execution we don't need this data any more
+        // after the child terminates
+        delete data;
+    }
+    else // sync execution
+    {
+        // let wxExecute() know that the process has terminated
+        data->pid = 0;
+    }

 }
 
 }