/////////////////////////////////////////////////////////////////////////////
-// Name: utilsunx.cpp
+// Name: unix/utilsunx.cpp
// Purpose: generic Unix implementation of many wx functions
// Author: Vadim Zeitlin
// Id: $Id$
#include "wx/process.h"
#include "wx/thread.h"
-#include "wx/stream.h"
+#include "wx/wfstream.h"
+// 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
-# include <sys/vfs.h>
-# endif
+ #ifdef __BSD__
+ #include <sys/param.h>
+ #include <sys/mount.h>
+ #else // !__BSD__
+ #include <sys/vfs.h>
+ #endif // __BSD__/!__BSD__
+
+ #define wxStatfs statfs
#endif // HAVE_STATFS
#ifdef HAVE_STATVFS
#include <sys/statvfs.h>
- #define statfs statvfs
+ #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
+
#if wxUSE_GUI
#include "wx/unix/execute.h"
#endif
{
wxCHECK_MSG( !command.IsEmpty(), 0, 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(),
+ _T("wxExecute() can be called only from the main thread") );
+#endif // wxUSE_THREADS
+
int argc = 0;
wxChar *argv[WXEXECUTE_NARGS];
wxString argument;
#if wxUSE_STREAMS
-class wxProcessFileInputStream : public wxInputStream
-{
-public:
- wxProcessFileInputStream(int fd) { m_fd = fd; }
- ~wxProcessFileInputStream() { close(m_fd); }
-
- virtual bool Eof() const;
-
-protected:
- size_t OnSysRead(void *buffer, size_t bufsize);
-
-protected:
- int m_fd;
-};
+// ----------------------------------------------------------------------------
+// wxPipeInputStream: stream for reading from a pipe
+// ----------------------------------------------------------------------------
-class wxProcessFileOutputStream : public wxOutputStream
+class wxPipeInputStream : public wxFileInputStream
{
public:
- wxProcessFileOutputStream(int fd) { m_fd = fd; }
- ~wxProcessFileOutputStream() { close(m_fd); }
+ wxPipeInputStream(int fd) : wxFileInputStream(fd) { }
-protected:
- size_t OnSysWrite(const void *buffer, size_t bufsize);
+ // return TRUE if the pipe is still opened
+ bool IsOpened() const { return !Eof(); }
-protected:
- int m_fd;
+ // return TRUE if we have anything to read, don't block
+ virtual bool CanRead() const;
};
-bool wxProcessFileInputStream::Eof() const
+bool wxPipeInputStream::CanRead() const
{
if ( m_lasterror == wxSTREAM_EOF )
- return TRUE;
+ return FALSE;
// check if there is any input available
struct timeval tv;
tv.tv_sec = 0;
tv.tv_usec = 0;
+ const int fd = m_file->fd();
+
fd_set readfds;
FD_ZERO(&readfds);
- FD_SET(m_fd, &readfds);
- switch ( select(m_fd + 1, &readfds, NULL, NULL, &tv) )
+ FD_SET(fd, &readfds);
+ switch ( select(fd + 1, &readfds, NULL, NULL, &tv) )
{
case -1:
wxLogSysError(_("Impossible to get child process input"));
// fall through
case 0:
- return TRUE;
+ return FALSE;
default:
wxFAIL_MSG(_T("unexpected select() return value"));
// still fall through
case 1:
- // input available: check if there is any
- return wxInputStream::Eof();
+ // 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();
}
}
-size_t wxProcessFileInputStream::OnSysRead(void *buffer, size_t bufsize)
-{
- int ret = read(m_fd, buffer, bufsize);
- if ( ret == 0 )
- {
- m_lasterror = wxSTREAM_EOF;
- }
- else if ( ret == -1 )
- {
- m_lasterror = wxSTREAM_READ_ERROR;
- ret = 0;
- }
- else
- {
- m_lasterror = wxSTREAM_NOERROR;
- }
-
- return ret;
-}
-
-size_t wxProcessFileOutputStream::OnSysWrite(const void *buffer, size_t bufsize)
-{
- int ret = write(m_fd, buffer, bufsize);
- if ( ret == -1 )
- {
- m_lasterror = wxSTREAM_WRITE_ERROR;
- ret = 0;
- }
- else
- {
- m_lasterror = wxSTREAM_NOERROR;
- }
+// define this to let wxexec.cpp know that we know what we're doing
+#define _WX_USED_BY_WXEXECUTE_
+#include "../common/execcmn.cpp"
- return ret;
-}
+#endif // wxUSE_STREAMS
// ----------------------------------------------------------------------------
-// wxStreamTempBuffer
+// wxPipe: this encapsulates pipe() system call
// ----------------------------------------------------------------------------
-/*
- Extract of a mail to wx-users to give the context of the problem we are
- trying to solve here:
-
- MC> If I run the command:
- MC> find . -name "*.h" -exec grep linux {} \;
- MC> in the exec sample synchronously from the 'Capture command output'
- MC> menu, wxExecute never returns. I have to xkill it. Has anyone
- MC> else encountered this?
-
- Yes, I can reproduce it too.
-
- I even think I understand why it happens: before launching the external
- command we set up a pipe with a valid file descriptor on the reading side
- when the output is redirected. So the subprocess happily writes to it ...
- until the pipe buffer (which is usually quite big on Unix, I think the
- default is 4Mb) is full. Then the writing process stops and waits until we
- read some data from the pipe to be able to continue writing to it but we
- never do it because we wait until it terminates to start reading and so we
- have a classical deadlock.
-
- Here is the fix: we now read the output as soon as it appears into a temp
- buffer (wxStreamTempBuffer object) and later just stuff it back into the
- stream when the process terminates. See supporting code in wxExecute()
- itself as well.
-*/
-
-class wxStreamTempBuffer
+class wxPipe
{
public:
- wxStreamTempBuffer();
+ // the symbolic names for the pipe ends
+ enum Direction
+ {
+ Read,
+ Write
+ };
- // call to associate a stream with this buffer, otherwise nothing happens
- // at all
- void Init(wxInputStream *stream);
+ enum
+ {
+ INVALID_FD = -1
+ };
- // check for input on our stream and cache it in our buffer if any
- void Update();
+ // default ctor doesn't do anything
+ wxPipe() { m_fds[Read] = m_fds[Write] = INVALID_FD; }
- ~wxStreamTempBuffer();
+ // create the pipe, return TRUE if ok, FALSE on error
+ bool Create()
+ {
+ if ( pipe(m_fds) == -1 )
+ {
+ wxLogSysError(_("Pipe creation failed"));
-private:
- // the stream we're buffering, if NULL we don't do anything at all
- wxInputStream *m_stream;
+ return FALSE;
+ }
- // the buffer of size m_size (NULL if m_size == 0)
- void *m_buffer;
+ return TRUE;
+ }
- // the size of the buffer
- size_t m_size;
-};
+ // return TRUE if we were created successfully
+ bool IsOk() const { return m_fds[Read] != INVALID_FD; }
-wxStreamTempBuffer::wxStreamTempBuffer()
-{
- m_stream = NULL;
- m_buffer = NULL;
- m_size = 0;
-}
+ // return the descriptor for one of the pipe ends
+ int operator[](Direction which) const
+ {
+ wxASSERT_MSG( which >= 0 && (size_t)which < WXSIZEOF(m_fds),
+ _T("invalid pipe index") );
-void wxStreamTempBuffer::Init(wxInputStream *stream)
-{
- m_stream = stream;
-}
+ return m_fds[which];
+ }
-void wxStreamTempBuffer::Update()
-{
- if ( m_stream && !m_stream->Eof() )
+ // detach a descriptor, meaning that the pipe dtor won't close it, and
+ // return it
+ int Detach(Direction which)
{
- // realloc in blocks of 1Kb - surely not the best strategy but which
- // one is?
- static const size_t incSize = 1024;
+ wxASSERT_MSG( which >= 0 && (size_t)which < WXSIZEOF(m_fds),
+ _T("invalid pipe index") );
- void *buf = realloc(m_buffer, m_size + incSize);
- if ( !buf )
- {
- // don't read any more, we don't have enough memory to do it
- m_stream = NULL;
- }
- else // got memory for the buffer
- {
- m_buffer = buf;
- m_stream->Read((char *)m_buffer + m_size, incSize);
- m_size += incSize;
- }
+ int fd = m_fds[which];
+ m_fds[which] = INVALID_FD;
+
+ return fd;
}
-}
-wxStreamTempBuffer::~wxStreamTempBuffer()
-{
- if ( m_buffer )
+ // close the pipe descriptors
+ void Close()
{
- m_stream->Ungetch(m_buffer, m_size);
- free(m_buffer);
+ for ( size_t n = 0; n < WXSIZEOF(m_fds); n++ )
+ {
+ if ( m_fds[n] != INVALID_FD )
+ close(m_fds[n]);
+ }
}
-}
-#endif // wxUSE_STREAMS
+ // dtor closes the pipe descriptors
+ ~wxPipe() { Close(); }
+
+private:
+ int m_fds[2];
+};
+
+// ----------------------------------------------------------------------------
+// wxExecute: the real worker function
+// ----------------------------------------------------------------------------
+
+#ifdef __VMS
+ #pragma message disable codeunreachable
+#endif
long wxExecute(wxChar **argv,
int flags,
#if wxUSE_GUI
// create pipes
- int end_proc_detect[2];
- if ( pipe(end_proc_detect) == -1 )
+ wxPipe pipeEndProcDetect;
+ if ( !pipeEndProcDetect.Create() )
{
- wxLogSysError( _("Pipe creation failed") );
wxLogError( _("Failed to execute '%s'\n"), *argv );
ARGS_CLEANUP;
#endif // wxUSE_GUI
// pipes for inter process communication
- int pipeIn[2], // stdin
- pipeOut[2], // stdout
- pipeErr[2]; // stderr
-
- pipeIn[0] = pipeIn[1] =
- pipeOut[0] = pipeOut[1] =
- pipeErr[0] = pipeErr[1] = -1;
+ wxPipe pipeIn, // stdin
+ pipeOut, // stdout
+ pipeErr; // stderr
if ( process && process->IsRedirected() )
{
- if ( pipe(pipeIn) == -1 || pipe(pipeOut) == -1 || pipe(pipeErr) == -1 )
+ if ( !pipeIn.Create() || !pipeOut.Create() || !pipeErr.Create() )
{
-#if wxUSE_GUI
- // free previously allocated resources
- close(end_proc_detect[0]);
- close(end_proc_detect[1]);
-#endif // wxUSE_GUI
-
- wxLogSysError( _("Pipe creation failed") );
wxLogError( _("Failed to execute '%s'\n"), *argv );
ARGS_CLEANUP;
}
// fork the process
-#ifdef 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
- pid_t pid = fork();
+ pid_t pid = fork();
#endif
-
- if ( pid == -1 ) // error?
+ if ( pid == -1 ) // error?
{
-#if wxUSE_GUI
- close(end_proc_detect[0]);
- close(end_proc_detect[1]);
- close(pipeIn[0]);
- close(pipeIn[1]);
- close(pipeOut[0]);
- close(pipeOut[1]);
- close(pipeErr[0]);
- close(pipeErr[1]);
-#endif // wxUSE_GUI
-
wxLogSysError( _("Fork failed") );
ARGS_CLEANUP;
}
else if ( pid == 0 ) // we're in child
{
-#if wxUSE_GUI
- close(end_proc_detect[0]); // close reading side
-#endif // wxUSE_GUI
-
// These 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
{
for ( int fd = 0; fd < FD_SETSIZE; fd++ )
{
- if ( fd == pipeIn[0] || fd == pipeOut[1] || fd == pipeErr[1]
+ if ( fd == pipeIn[wxPipe::Read]
+ || fd == pipeOut[wxPipe::Write]
+ || fd == pipeErr[wxPipe::Write]
#if wxUSE_GUI
- || fd == end_proc_detect[1]
+ || fd == pipeEndProcDetect[wxPipe::Write]
#endif // wxUSE_GUI
)
{
continue;
}
- // leave stderr opened too, it won't do any hurm
+ // leave stderr opened too, it won't do any harm
if ( fd != STDERR_FILENO )
close(fd);
}
+ }
-#ifndef __VMS
- if ( flags & wxEXEC_MAKE_GROUP_LEADER )
- {
- // Set process group to child process' pid. Then killing -pid
- // of the parent will kill the process and all of its children.
- setsid();
- }
-#endif
+#if !defined(__VMS) && !defined(__EMX__)
+ if ( flags & wxEXEC_MAKE_GROUP_LEADER )
+ {
+ // 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 wxUSE_GUI
+ // reading side can be safely closed but we should keep the write one
+ // opened
+ pipeEndProcDetect.Detach(wxPipe::Write);
+ pipeEndProcDetect.Close();
+#endif // wxUSE_GUI
- // redirect stdio, stdout and stderr
- if ( pipeIn[0] != -1 )
+ // redirect stdin, stdout and stderr
+ if ( pipeIn.IsOk() )
{
- if ( dup2(pipeIn[0], STDIN_FILENO) == -1 ||
- dup2(pipeOut[1], STDOUT_FILENO) == -1 ||
- dup2(pipeErr[1], STDERR_FILENO) == -1 )
+ if ( dup2(pipeIn[wxPipe::Read], STDIN_FILENO) == -1 ||
+ dup2(pipeOut[wxPipe::Write], STDOUT_FILENO) == -1 ||
+ dup2(pipeErr[wxPipe::Write], STDERR_FILENO) == -1 )
{
wxLogSysError(_("Failed to redirect child process input/output"));
}
- close(pipeIn[0]);
- close(pipeOut[1]);
- close(pipeErr[1]);
+ pipeIn.Close();
+ pipeOut.Close();
+ pipeErr.Close();
}
execvp (*mb_argv, mb_argv);
+ fprintf(stderr, "execvp(");
+ for ( char **ppc = mb_argv; *ppc; ppc++ )
+ fprintf(stderr, "%s%s", ppc == mb_argv ? "" : ", ", *ppc);
+ fprintf(stderr, ") failed with error %d!\n", errno);
+
// there is no return after successful exec()
_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
{
ARGS_CLEANUP;
- // pipe initialization: construction of the wxStreams
+ // prepare for IO redirection
+
#if wxUSE_STREAMS
- wxStreamTempBuffer bufIn, bufErr;
+ // the input buffer bufOut is connected to stdout, this is why it is
+ // called bufOut and not bufIn
+ wxStreamTempInputBuffer bufOut,
+ bufErr;
#endif // wxUSE_STREAMS
if ( process && process->IsRedirected() )
{
#if wxUSE_STREAMS
- // in/out for subprocess correspond to our out/in
- wxOutputStream *outStream = new wxProcessFileOutputStream(pipeIn[1]);
- wxInputStream *inStream = new wxProcessFileInputStream(pipeOut[0]);
- wxInputStream *errStream = new wxProcessFileInputStream(pipeErr[0]);
+ wxOutputStream *inStream =
+ new wxFileOutputStream(pipeIn.Detach(wxPipe::Write));
+
+ wxPipeInputStream *outStream =
+ new wxPipeInputStream(pipeOut.Detach(wxPipe::Read));
- process->SetPipeStreams(inStream, outStream, errStream);
+ wxPipeInputStream *errStream =
+ new wxPipeInputStream(pipeErr.Detach(wxPipe::Read));
- bufIn.Init(inStream);
- bufErr.Init(inStream);
+ process->SetPipeStreams(outStream, inStream, errStream);
+
+ bufOut.Init(outStream);
+ bufErr.Init(errStream);
#endif // wxUSE_STREAMS
+ }
- close(pipeIn[0]); // close reading side
- close(pipeOut[1]); // close writing side
- close(pipeErr[1]); // close writing side
+ if ( pipeIn.IsOk() )
+ {
+ pipeIn.Close();
+ pipeOut.Close();
+ pipeErr.Close();
}
#if wxUSE_GUI && !defined(__WXMICROWIN__)
wxEndProcessData *data = new wxEndProcessData;
+ data->tag = wxAddProcessCallback
+ (
+ data,
+ pipeEndProcDetect.Detach(wxPipe::Read)
+ );
+
+ pipeEndProcDetect.Close();
+
if ( flags & wxEXEC_SYNC )
{
// we may have process for capturing the program output, but it's
// sync execution: indicate it by negating the pid
data->pid = -pid;
- data->tag = wxAddProcessCallback(data, end_proc_detect[0]);
-
- close(end_proc_detect[1]); // close writing side
wxBusyCursor bc;
wxWindowDisabler wd;
while ( data->pid != 0 )
{
#if wxUSE_STREAMS
- bufIn.Update();
+ bufOut.Update();
bufErr.Update();
#endif // wxUSE_STREAMS
// will be deleted in GTK_EndProcessDetector
data->process = process;
data->pid = pid;
- data->tag = wxAddProcessCallback(data, end_proc_detect[0]);
-
- close(end_proc_detect[1]); // close writing side
return pid;
}
return exitcode;
#endif // wxUSE_GUI
}
+
+ return ERROR_RETURN_CODE;
}
+#ifdef __VMS
+ #pragma message enable codeunreachable
+#endif
+
#undef ERROR_RETURN_CODE
#undef ARGS_CLEANUP
const wxChar* wxGetHomeDir( wxString *home )
{
*home = wxGetUserHome( wxString() );
- wxString tmp;
+ wxString tmp;
if ( home->IsEmpty() )
*home = wxT("/");
#ifdef __VMS
- tmp = *home;
- if ( tmp.Last() != wxT(']'))
- if ( tmp.Last() != wxT('/')) *home << wxT('/');
+ tmp = *home;
+ if ( tmp.Last() != wxT(']'))
+ if ( tmp.Last() != wxT('/')) *home << wxT('/');
#endif
return home->c_str();
}
if ((ptr = wxGetenv(wxT("HOME"))) != NULL)
{
+#if wxUSE_UNICODE
+ wxWCharBuffer buffer( ptr );
+ return buffer;
+#else
return ptr;
+#endif
}
if ((ptr = wxGetenv(wxT("USER"))) != NULL || (ptr = wxGetenv(wxT("LOGNAME"))) != NULL)
{
#ifndef WXWIN_OS_DESCRIPTION
#error WXWIN_OS_DESCRIPTION should be defined in config.h by configure
#else
- return WXWIN_OS_DESCRIPTION;
+ return wxString::FromAscii( WXWIN_OS_DESCRIPTION );
#endif
}
#endif
#endif // !wxUSE_GUI
+unsigned long wxGetProcessId()
+{
+ return (unsigned long)getpid();
+}
+
long wxGetFreeMemory()
{
#if defined(__LINUX__)
{
#if defined(HAVE_STATFS) || defined(HAVE_STATVFS)
// the case to "char *" is needed for AIX 4.3
- struct statfs fs;
- if ( statfs((char *)path.fn_str(), &fs) != 0 )
+ wxStatfs_t fs;
+ if ( wxStatfs((char *)(const char*)path.fn_str(), &fs) != 0 )
{
- wxLogSysError("Failed to get file system statistics");
+ wxLogSysError( wxT("Failed to get file system statistics") );
return FALSE;
}
- // under Solaris we might have to use fs.f_frsize instead as I think it
- // may be a multiple of the block size in general (TODO)
+ // 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
+ wxLongLong blockSize = fs.f_frsize;
+#else // HAVE_STATFS
+ wxLongLong blockSize = fs.f_bsize;
+#endif // HAVE_STATVFS/HAVE_STATFS
if ( pTotal )
{
- *pTotal = wxLongLong(fs.f_blocks) * fs.f_bsize;
+ *pTotal = wxLongLong(fs.f_blocks) * blockSize;
}
if ( pFree )
{
- *pFree = wxLongLong(fs.f_bavail) * fs.f_bsize;
+ *pFree = wxLongLong(fs.f_bavail) * blockSize;
}
return TRUE;
-#endif // HAVE_STATFS
-
+#else // !HAVE_STATFS && !HAVE_STATVFS
return FALSE;
+#endif // HAVE_STATFS
}
// ----------------------------------------------------------------------------
projects / wxWidgets.git / blobdiff