/////////////////////////////////////////////////////////////////////////////
// Name: src/unix/utilsunx.cpp
-// Purpose: generic Unix implementation of many wx functions
+// Purpose: generic Unix implementation of many wx functions (for wxBase)
// Author: Vadim Zeitlin
// Id: $Id$
// Copyright: (c) 1998 Robert Roebling, Vadim Zeitlin
#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/private.h"
return err;
}
-#define WXEXECUTE_NARGS 127
-
-#if defined(__DARWIN__)
-long wxMacExecute(wxChar **argv,
- int flags,
- wxProcess *process);
-#endif
-
-long wxExecute( const wxString& command, int flags, wxProcess *process )
+// Shutdown or reboot the PC
+bool wxShutdown(int flags)
{
- wxCHECK_MSG( !command.empty(), 0, wxT("can't exec empty command") );
+ flags &= ~wxSHUTDOWN_FORCE;
- wxLogTrace(wxT("exec"), wxT("Executing \"%s\""), command.c_str());
+ wxChar level;
+ switch ( flags )
+ {
+ case wxSHUTDOWN_POWEROFF:
+ level = _T('0');
+ break;
-#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
+ case wxSHUTDOWN_REBOOT:
+ level = _T('6');
+ break;
- int argc = 0;
- wxChar *argv[WXEXECUTE_NARGS];
- wxString argument;
- const wxChar *cptr = command.c_str();
- wxChar quotechar = wxT('\0'); // is arg quoted?
- bool escaped = false;
+ case wxSHUTDOWN_LOGOFF:
+ // TODO: use dcop to log off?
+ return false;
- // split the command line in arguments
- do
- {
- argument = wxEmptyString;
- quotechar = wxT('\0');
+ default:
+ wxFAIL_MSG( _T("unknown wxShutdown() flag") );
+ return false;
+ }
- // eat leading whitespace:
- while ( wxIsspace(*cptr) )
- cptr++;
+ return system(wxString::Format("init %c", level).mb_str()) == 0;
+}
- if ( *cptr == wxT('\'') || *cptr == wxT('"') )
- quotechar = *cptr++;
+// ----------------------------------------------------------------------------
+// wxStream classes to support IO redirection in wxExecute
+// ----------------------------------------------------------------------------
- do
- {
- if ( *cptr == wxT('\\') && ! escaped )
- {
- escaped = true;
- cptr++;
- continue;
- }
+#if HAS_PIPE_INPUT_STREAM
- // all other characters:
- argument += *cptr++;
- escaped = false;
+bool wxPipeInputStream::CanRead() const
+{
+ if ( m_lasterror == wxSTREAM_EOF )
+ return false;
- // have we reached the end of the argument?
- if ( (*cptr == quotechar && ! escaped)
- || (quotechar == wxT('\0') && wxIsspace(*cptr))
- || *cptr == wxT('\0') )
- {
- wxASSERT_MSG( argc < WXEXECUTE_NARGS,
- wxT("too many arguments in wxExecute") );
+ // check if there is any input available
+ struct timeval tv;
+ tv.tv_sec = 0;
+ tv.tv_usec = 0;
- argv[argc] = new wxChar[argument.length() + 1];
- wxStrcpy(argv[argc], argument.c_str());
- argc++;
+ const int fd = m_file->fd();
- // if not at end of buffer, swallow last character:
- if(*cptr)
- cptr++;
+ fd_set readfds;
- break; // done with this one, start over
- }
- } while(*cptr);
- } while(*cptr);
- argv[argc] = NULL;
+ wxFD_ZERO(&readfds);
+ wxFD_SET(fd, &readfds);
- long lRc;
-#if defined(__DARWIN__)
- // wxMacExecute only executes app bundles.
- // It returns an error code if the target is not an app bundle, thus falling
- // through to the regular wxExecute for non app bundles.
- lRc = wxMacExecute(argv, flags, process);
- if( lRc != ((flags & wxEXEC_SYNC) ? -1 : 0))
- return lRc;
-#endif
+ switch ( select(fd + 1, &readfds, NULL, NULL, &tv) )
+ {
+ case -1:
+ wxLogSysError(_("Impossible to get child process input"));
+ // fall through
- // do execute the command
- lRc = wxExecute(argv, flags, process);
+ case 0:
+ return false;
- // clean up
- argc = 0;
- while( argv[argc] )
- delete [] argv[argc++];
+ default:
+ wxFAIL_MSG(_T("unexpected select() return value"));
+ // still fall through
- return lRc;
+ 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();
+ }
}
+#endif // HAS_PIPE_INPUT_STREAM
+
// ----------------------------------------------------------------------------
// wxShell
// ----------------------------------------------------------------------------
return wxExecute(wxMakeShellCommand(command), output);
}
-// Shutdown or reboot the PC
-bool wxShutdown(wxShutdownFlags wFlags)
+namespace
{
- wxChar level;
- switch ( wFlags )
+
+// 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)
{
- case wxSHUTDOWN_POWEROFF:
- level = _T('0');
- break;
+ Init(args.size());
- case wxSHUTDOWN_REBOOT:
- level = _T('6');
- break;
+ for ( int i = 0; i < m_argc; i++ )
+ {
+ m_argv[i] = wxStrdup(args[i]);
+ }
+ }
- default:
- wxFAIL_MSG( _T("unknown wxShutdown() flag") );
- return false;
+#if wxUSE_UNICODE
+ ArgsArray(wchar_t **wargv)
+ {
+ int argc = 0;
+ while ( *wargv++ )
+ argc++;
+
+ Init(argc);
+
+ for ( int i = 0; i < m_argc; i++ )
+ {
+ m_argv[i] = wxSafeConvertWX2MB(wargv[i]).release();
+ }
}
+#endif // wxUSE_UNICODE
- return system(wxString::Format(_T("init %c"), level).mb_str()) == 0;
-}
+ ~ArgsArray()
+ {
+ for ( int i = 0; i < m_argc; i++ )
+ {
+ free(m_argv[i]);
+ }
-// ----------------------------------------------------------------------------
-// wxStream classes to support IO redirection in wxExecute
-// ----------------------------------------------------------------------------
+ delete [] m_argv;
+ }
-#if HAS_PIPE_INPUT_STREAM
+ operator char**() const { return m_argv; }
-bool wxPipeInputStream::CanRead() const
-{
- if ( m_lasterror == wxSTREAM_EOF )
- return false;
+private:
+ void Init(int argc)
+ {
+ m_argc = argc;
+ m_argv = new char *[m_argc + 1];
+ m_argv[m_argc] = NULL;
+ }
- // check if there is any input available
- struct timeval tv;
- tv.tv_sec = 0;
- tv.tv_usec = 0;
+ int m_argc;
+ char **m_argv;
- const int fd = m_file->fd();
+ DECLARE_NO_COPY_CLASS(ArgsArray)
+};
- fd_set readfds;
+} // anonymous namespace
- wxFD_ZERO(&readfds);
- wxFD_SET(fd, &readfds);
+// ----------------------------------------------------------------------------
+// wxExecute implementations
+// ----------------------------------------------------------------------------
- switch ( select(fd + 1, &readfds, NULL, NULL, &tv) )
- {
- case -1:
- wxLogSysError(_("Impossible to get child process input"));
- // fall through
+#if defined(__DARWIN__)
+bool wxMacLaunch(char **argv);
+#endif
- case 0:
- return false;
+long wxExecute(const wxString& command, int flags, wxProcess *process)
+{
+ ArgsArray argv(wxCmdLineParser::ConvertStringToArgs(command,
+ wxCMD_LINE_SPLIT_UNIX));
- default:
- wxFAIL_MSG(_T("unexpected select() return value"));
- // still fall through
+ return wxExecute(argv, flags, process);
+}
- 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();
- }
+#if wxUSE_UNICODE
+
+long wxExecute(wchar_t **wargv, int flags, wxProcess *process)
+{
+ ArgsArray argv(wargv);
+
+ return wxExecute(argv, flags, process);
}
-#endif // HAS_PIPE_INPUT_STREAM
+#endif // wxUSE_UNICODE
-// ----------------------------------------------------------------------------
// wxExecute: the real worker function
-// ----------------------------------------------------------------------------
-
-long wxExecute(wxChar **argv, int flags, wxProcess *process)
+long wxExecute(char **argv, int flags, wxProcess *process)
{
// for the sync execution, we return -1 to indicate failure, but for async
// case we return 0 which is never a valid PID
wxCHECK_MSG( *argv, ERROR_RETURN_CODE, wxT("can't exec empty command") );
-#if wxUSE_UNICODE
- int mb_argc = 0;
- char *mb_argv[WXEXECUTE_NARGS];
+#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
- while (argv[mb_argc])
+#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) )
{
- wxWX2MBbuf mb_arg = wxSafeConvertWX2MB(argv[mb_argc]);
- mb_argv[mb_argc] = strdup(mb_arg);
- mb_argc++;
+ // we don't have any PID to return so just make up something non null
+ return -1;
}
- mb_argv[mb_argc] = (char *) NULL;
-
- // this macro will free memory we used above
- #define ARGS_CLEANUP \
- for ( mb_argc = 0; mb_argv[mb_argc]; mb_argc++ ) \
- free(mb_argv[mb_argc])
-#else // ANSI
- // no need for cleanup
- #define ARGS_CLEANUP
-
- wxChar **mb_argv = argv;
-#endif // Unicode/ANSI
-
- // 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;
-
- // this struct contains all information which we pass to and from
- // wxAppTraits methods
+#endif // __DARWIN__
+
+
+ // this struct contains all information which we use for housekeeping
wxExecuteData execData;
execData.flags = flags;
execData.process = process;
// create pipes
- if ( !traits->CreateEndProcessPipe(execData) )
+ if ( !execData.pipeEndProcDetect.Create() )
{
wxLogError( _("Failed to execute '%s'\n"), *argv );
- ARGS_CLEANUP;
-
return ERROR_RETURN_CODE;
}
{
wxLogError( _("Failed to execute '%s'\n"), *argv );
- ARGS_CLEANUP;
-
return ERROR_RETURN_CODE;
}
}
{
wxLogSysError( _("Fork failed") );
- ARGS_CLEANUP;
-
return ERROR_RETURN_CODE;
}
else if ( pid == 0 ) // we're in child
{
- // 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
- // start an xterm executing it.
- if ( !(flags & wxEXEC_SYNC) )
- {
- // FD_SETSIZE is unsigned under BSD, signed under other platforms
- // so we need a cast to avoid warnings on all platforms
- for ( int fd = 0; fd < (int)FD_SETSIZE; fd++ )
- {
- if ( fd == pipeIn[wxPipe::Read]
- || fd == pipeOut[wxPipe::Write]
- || fd == pipeErr[wxPipe::Write]
- || traits->IsWriteFDOfEndProcessPipe(execData, fd) )
- {
- // don't close this one, we still need it
- continue;
- }
-
- // leave stderr opened too, it won't do any harm
- if ( fd != STDERR_FILENO )
- close(fd);
- }
- }
+ // 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
#if !defined(__VMS) && !defined(__EMX__)
if ( flags & wxEXEC_MAKE_GROUP_LEADER )
#endif // !__VMS
// reading side can be safely closed but we should keep the write one
- // opened
- traits->DetachWriteFDOfEndProcessPipe(execData);
+ // opened, it will be only closed when the process terminates resulting
+ // in a read notification to the parent
+ execData.pipeEndProcDetect.Detach(wxPipe::Write);
+ execData.pipeEndProcDetect.Close();
// redirect stdin, stdout and stderr
if ( pipeIn.IsOk() )
pipeErr.Close();
}
- execvp (*mb_argv, mb_argv);
+ execvp(*argv, argv);
fprintf(stderr, "execvp(");
- // CS changed ppc to ppc_ as ppc is not available under mac os CW Mach-O
- for ( char **ppc_ = mb_argv; *ppc_; ppc_++ )
- fprintf(stderr, "%s%s", ppc_ == mb_argv ? "" : ", ", *ppc_);
+ 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()
}
else // we're in parent
{
- ARGS_CLEANUP;
-
// save it for WaitForChild() use
execData.pid = pid;
// called bufOut and not bufIn
wxStreamTempInputBuffer bufOut,
bufErr;
-#endif // HAS_PIPE_INPUT_STREAM
if ( process && process->IsRedirected() )
{
-#if HAS_PIPE_INPUT_STREAM
wxOutputStream *inStream =
new wxFileOutputStream(pipeIn.Detach(wxPipe::Write));
- wxPipeInputStream *outStream =
- new wxPipeInputStream(pipeOut.Detach(wxPipe::Read));
+ const int fdOut = pipeOut.Detach(wxPipe::Read);
+ wxPipeInputStream *outStream = new wxPipeInputStream(fdOut);
- wxPipeInputStream *errStream =
- new wxPipeInputStream(pipeErr.Detach(wxPipe::Read));
+ const int fdErr = pipeErr.Detach(wxPipe::Read);
+ wxPipeInputStream *errStream = new wxPipeInputStream(fdErr);
process->SetPipeStreams(outStream, inStream, errStream);
execData.bufOut = &bufOut;
execData.bufErr = &bufErr;
-#endif // HAS_PIPE_INPUT_STREAM
+
+ execData.fdOut = fdOut;
+ execData.fdErr = fdErr;
}
+#endif // HAS_PIPE_INPUT_STREAM
if ( pipeIn.IsOk() )
{
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);
}
}
#undef ERROR_RETURN_CODE
-#undef ARGS_CLEANUP
// ----------------------------------------------------------------------------
// file and directory functions
bool ok = uname(&uts) != -1;
if ( ok )
{
- wxStrncpy(buf, wxSafeConvertMB2WX(uts.nodename), sz - 1);
- buf[sz] = wxT('\0');
+ wxStrlcpy(buf, wxSafeConvertMB2WX(uts.nodename), sz);
}
#elif defined(HAVE_GETHOSTNAME)
char cbuf[sz];
bool ok = gethostname(cbuf, sz) != -1;
if ( ok )
{
- wxStrncpy(buf, wxSafeConvertMB2WX(cbuf), sz - 1);
- buf[sz] = wxT('\0');
+ wxStrlcpy(buf, wxSafeConvertMB2WX(cbuf), sz);
}
#else // no uname, no gethostname
wxFAIL_MSG(wxT("don't know host name for this machine"));
else
{
// the canonical name
- wxStrncpy(buf, wxSafeConvertMB2WX(host->h_name), sz);
+ wxStrlcpy(buf, wxSafeConvertMB2WX(host->h_name), sz);
}
}
//else: it's already a FQDN (BSD behaves this way)
*buf = wxT('\0');
if ((who = getpwuid(getuid ())) != NULL)
{
- wxStrncpy (buf, wxSafeConvertMB2WX(who->pw_name), sz - 1);
+ wxStrlcpy (buf, wxSafeConvertMB2WX(who->pw_name), sz);
return true;
}
char *comma = strchr(who->pw_gecos, ',');
if (comma)
*comma = '\0'; // cut off non-name comment fields
- wxStrncpy (buf, wxSafeConvertMB2WX(who->pw_gecos), sz - 1);
+ wxStrlcpy(buf, wxSafeConvertMB2WX(who->pw_gecos), sz);
return true;
}
machine.Contains(wxT("alpha"));
}
-// these functions are in mac/utils.cpp for wxMac
+// these functions are in src/osx/utilsexc_base.cpp for wxMac
#ifndef __WXMAC__
wxOperatingSystemId wxGetOsVersion(int *verMaj, int *verMin)
// wxExecute support
// ----------------------------------------------------------------------------
-bool wxAppTraits::CreateEndProcessPipe(wxExecuteData& execData)
-{
- return execData.pipeEndProcDetect.Create();
-}
-
-bool wxAppTraits::IsWriteFDOfEndProcessPipe(wxExecuteData& execData, int fd)
-{
- return fd == (execData.pipeEndProcDetect)[wxPipe::Write];
-}
-
-void wxAppTraits::DetachWriteFDOfEndProcessPipe(wxExecuteData& execData)
-{
- execData.pipeEndProcDetect.Detach(wxPipe::Write);
- execData.pipeEndProcDetect.Close();
-}
-
int wxAppTraits::AddProcessCallback(wxEndProcessData *data, int fd)
{
// define a custom handler processing only the closure of the descriptor
{
wxEndProcessFDIOHandler(wxEndProcessData *data, int fd)
: m_data(data), m_fd(fd)
- {}
+ {
+ }
virtual void OnReadWaiting()
- { wxFAIL_MSG("this isn't supposed to happen"); }
- virtual void OnWriteWaiting()
- { wxFAIL_MSG("this isn't supposed to happen"); }
-
- virtual void OnExceptionWaiting()
{
- const int pid = m_data->pid > 0 ? m_data->pid : -(m_data->pid);
- int status = 0;
-
- // has the process really terminated?
- int rc = waitpid(pid, &status, WNOHANG);
- if ( rc == 0 )
- {
- // 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
- // (OnExceptionWaiting() won't be called again, the descriptor
- // is closed now).
- wxLogDebug("Child process (PID %d) still alive, "
- "even though pipe was closed.", pid);
- }
- else if ( rc == -1 )
- {
- // As above, if waitpid() fails, the best we can do is to log the
- // error and pretend the child terminated:
- wxLogSysError(_("Failed to check child process' status"));
- }
-
- // set exit code to -1 if something bad happened
- m_data->exitcode = rc > 0 && WIFEXITED(status) ? WEXITSTATUS(status)
- : -1;
-
- wxLogTrace("exec",
- "Child process (PID %d) terminated with exit code %d",
- pid, m_data->exitcode);
-
- // child exited, end waiting
wxFDIODispatcher::Get()->UnregisterFD(m_fd);
close(m_fd);
delete this;
}
+ virtual void OnWriteWaiting() { wxFAIL_MSG("unreachable"); }
+ virtual void OnExceptionWaiting() { wxFAIL_MSG("unreachable"); }
+
wxEndProcessData * const m_data;
const int m_fd;
};
(
fd,
new wxEndProcessFDIOHandler(data, fd),
- wxFDIO_EXCEPTION
+ wxFDIO_INPUT
);
return fd; // unused, but return something unique for the tag
}
#endif // HAS_PIPE_INPUT_STREAM/!HAS_PIPE_INPUT_STREAM
}
-int wxAppTraits::WaitForChild(wxExecuteData& execData)
+// helper classes/functions used by WaitForChild()
+namespace
{
- if ( execData.flags & wxEXEC_SYNC )
+
+// 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)
{
- // just block waiting for the child to exit
- int status = 0;
-
- int result = waitpid(execData.pid, &status, 0);
-#ifdef __DARWIN__
- /* DE: waitpid manpage states that waitpid can fail with EINTR
- if the call is interrupted by a caught signal. I suppose
- that means that this ought to be a while loop.
-
- The odd thing is that it seems to fail EVERY time. It fails
- with a quickly exiting process (e.g. echo), and fails with a
- slowly exiting process (e.g. sleep 2) but clearly after
- having waited for the child to exit. Maybe it's a bug in
- my particular version.
-
- It works, however, from the CFSocket callback without this
- trick but in that case it's used only after CFSocket calls
- the callback and with the WNOHANG flag which would seem to
- preclude it from being interrupted or at least make it much
- less likely since it would not then be waiting.
-
- If Darwin's man page is to be believed then this is definitely
- necessary. It's just weird that I've never seen it before
- and apparently no one else has either or you'd think they'd
- have reported it by now. Perhaps blocking the GUI while
- waiting for a child process to exit is simply not that common.
- */
- if ( result == -1 && errno == EINTR )
- {
- result = waitpid(execData.pid, &status, 0);
- }
-#endif // __DARWIN__
+ if ( fd )
+ disp.RegisterFD(fd, this, wxFDIO_INPUT);
+ }
+
+ virtual void OnWriteWaiting() { wxFAIL_MSG("unreachable"); }
+ virtual void OnExceptionWaiting() { wxFAIL_MSG("unreachable"); }
- if ( result == -1 )
+protected:
+ const int m_fd;
+
+ DECLARE_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)
+ {
+ m_terminated = false;
+ }
+
+ bool Terminated() const { return m_terminated; }
+
+ virtual void OnReadWaiting() { m_terminated = true; }
+
+private:
+ bool m_terminated;
+
+ DECLARE_NO_COPY_CLASS(wxEndHandler)
+};
+
+#if HAS_PIPE_INPUT_STREAM
+
+// 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)
+ {
+ }
+
+ virtual void OnReadWaiting()
+ {
+ m_buf->Update();
+ }
+
+private:
+ wxStreamTempInputBuffer * const m_buf;
+
+ DECLARE_NO_COPY_CLASS(wxRedirectedIOHandler)
+};
+
+#endif // HAS_PIPE_INPUT_STREAM
+
+// helper function which calls waitpid() and analyzes the result
+int DoWaitForChild(int pid, int flags = 0)
+{
+ wxASSERT_MSG( pid > 0, "invalid PID" );
+
+ int status, rc;
+
+ // loop while we're getting EINTR
+ for ( ;; )
+ {
+ rc = waitpid(pid, &status, flags);
+
+ if ( rc != -1 || errno != EINTR )
+ break;
+ }
+
+ if ( rc == 0 )
+ {
+ // 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" );
+
+ if ( WIFEXITED(status) )
+ return WEXITSTATUS(status);
+ else if ( WIFSIGNALED(status) )
+ return -WTERMSIG(status);
+ else
{
- wxLogLastError("waitpid");
+ wxLogError("Child process (PID %d) exited for unknown reason, "
+ "status = %d", pid, status);
}
- else // child terminated
- {
- wxASSERT_MSG( result == execData.pid,
- "unexpected waitpid() return value" );
+ }
- if ( WIFEXITED(status) )
- {
- return WEXITSTATUS(status);
- }
- else // abnormal termination?
- {
- wxASSERT_MSG( WIFSIGNALED(status),
- "unexpected child wait status" );
- }
- }
+ return -1;
+}
- wxLogSysError(_("Waiting for subprocess termination failed"));
+} // anonymous namespace
- return -1;
- }
- else // asynchronous execution
+int wxAppTraits::WaitForChild(wxExecuteData& execData)
+{
+ 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->process = execData.process;
+ endProcData->pid = execData.pid;
endProcData->tag = AddProcessCallback
(
endProcData,
- execData.pipeEndProcDetect.Detach(wxPipe::Read)
+ execData.GetEndProcReadFD()
);
+ endProcData->async = true;
- execData.pipeEndProcDetect.Close();
return execData.pid;
+ }
+ //else: synchronous execution case
+#if HAS_PIPE_INPUT_STREAM
+ wxProcess * const process = execData.process;
+ if ( process && process->IsRedirected() )
+ {
+ // 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;
+
+ wxEndHandler endHandler(disp, execData.GetEndProcReadFD());
+
+ wxRedirectedIOHandler outHandler(disp, execData.fdOut, execData.bufOut),
+ errHandler(disp, execData.fdErr, execData.bufErr);
+
+ while ( !endHandler.Terminated() )
+ {
+ disp.Dispatch();
+ }
}
+ //else: no IO redirection, just block waiting for the child to exit
+#endif // HAS_PIPE_INPUT_STREAM
+
+ return DoWaitForChild(execData.pid);
}
-void wxHandleProcessTermination(wxEndProcessData *proc_data)
+void wxHandleProcessTermination(wxEndProcessData *data)
{
+ data->exitcode = DoWaitForChild(data->pid, WNOHANG);
+
// notify user about termination if required
- if ( proc_data->process )
+ if ( data->process )
{
- proc_data->process->OnTerminate(proc_data->pid, proc_data->exitcode);
+ data->process->OnTerminate(data->pid, data->exitcode);
}
- // clean up
- if ( proc_data->pid > 0 )
+ if ( data->async )
{
- // async execution
- delete proc_data;
+ // 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
- proc_data->pid = 0;
+ data->pid = 0;
}
}
projects / wxWidgets.git / blobdiff