X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/f895c3fce291ad1071041b8ddff8ecf283c5b68e..87b621a5b737c09cef079bb4a9ef53be132d2ce0:/src/unix/utilsunx.cpp diff --git a/src/unix/utilsunx.cpp b/src/unix/utilsunx.cpp index 282f439258..07a73e5266 100644 --- a/src/unix/utilsunx.cpp +++ b/src/unix/utilsunx.cpp @@ -69,26 +69,6 @@ #endif // HAS_PIPE_STREAMS -#if defined(__MWERKS__) && defined(__MACH__) - #ifndef WXWIN_OS_DESCRIPTION - #define WXWIN_OS_DESCRIPTION "MacOS X" - #endif - #ifndef HAVE_NANOSLEEP - #define HAVE_NANOSLEEP - #endif - #ifndef HAVE_UNAME - #define HAVE_UNAME - #endif - - // our configure test believes we can use sigaction() if the function is - // available but Metrowekrs with MSL run-time does have the function but - // doesn't have sigaction struct so finally we can't use it... - #ifdef __MSL__ - #undef wxUSE_ON_FATAL_EXCEPTION - #define wxUSE_ON_FATAL_EXCEPTION 0 - #endif -#endif - // 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 @@ -152,6 +132,10 @@ #include // for SAGET and MINFO structures #endif +#ifdef HAVE_SETPRIORITY + #include // for setpriority() +#endif + // ---------------------------------------------------------------------------- // conditional compilation // ---------------------------------------------------------------------------- @@ -337,6 +321,45 @@ bool wxPipeInputStream::CanRead() const } } +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 // ---------------------------------------------------------------------------- @@ -526,6 +549,21 @@ long wxExecute(char **argv, int flags, wxProcess *process, } } + // 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 // // NB: do *not* use vfork() here, it completely breaks this code for some @@ -559,11 +597,12 @@ long wxExecute(char **argv, int flags, wxProcess *process, } #endif // !__VMS - // reading side can be safely closed but we should keep the write one - // 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(); +#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() ) @@ -580,6 +619,39 @@ long wxExecute(char **argv, int flags, wxProcess *process, pipeErr.Close(); } + // 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); + } + } + + // Process additional options if we have any if ( env ) { @@ -662,10 +734,13 @@ long wxExecute(char **argv, int flags, wxProcess *process, // 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 } wxOutputStream *inStream = - new wxFileOutputStream(pipeIn.Detach(wxPipe::Write)); + new wxPipeOutputStream(pipeIn.Detach(wxPipe::Write)); const int fdOut = pipeOut.Detach(wxPipe::Read); wxPipeInputStream *outStream = new wxPipeInputStream(fdOut); @@ -943,7 +1018,7 @@ wxLinuxDistributionInfo wxGetLinuxDistributionInfo() #endif // these functions are in src/osx/utilsexc_base.cpp for wxMac -#ifndef __WXMAC__ +#ifndef __DARWIN__ wxOperatingSystemId wxGetOsVersion(int *verMaj, int *verMin) { @@ -979,7 +1054,7 @@ wxString wxGetOsDescription() return wxGetCommandOutput(wxT("uname -s -r -m")); } -#endif // !__WXMAC__ +#endif // !__DARWIN__ unsigned long wxGetProcessId() {