X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/8b33ae2d5a6ed14ab4b89391b2a1cb5e9f164e90..16d38102e8ad5534d185cc532b9aa8077a75e0a4:/src/unix/utilsunx.cpp?ds=sidebyside diff --git a/src/unix/utilsunx.cpp b/src/unix/utilsunx.cpp index fe4abae50e..0581126a28 100644 --- a/src/unix/utilsunx.cpp +++ b/src/unix/utilsunx.cpp @@ -20,6 +20,7 @@ #include "wx/intl.h" #include "wx/log.h" +#include "wx/app.h" #include "wx/utils.h" #include "wx/process.h" @@ -27,10 +28,25 @@ #include "wx/stream.h" +#ifdef HAVE_STATFS +# ifdef __DARWIN__ +# include +# include +# else +# include +# endif +#endif // HAVE_STATFS + #if wxUSE_GUI #include "wx/unix/execute.h" #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 #include #include @@ -128,9 +144,39 @@ void wxUsleep(unsigned long milliseconds) // process management // ---------------------------------------------------------------------------- -int wxKill(long pid, wxSignal sig) +int wxKill(long pid, wxSignal sig, wxKillError *rc) { - return kill((pid_t)pid, (int)sig); + int err = kill((pid_t)pid, (int)sig); + if ( rc ) + { + switch ( err ) + { + case 0: + *rc = wxKILL_OK; + break; + + case EINVAL: + *rc = wxKILL_BAD_SIGNAL; + break; + + case EPERM: + *rc = wxKILL_ACCESS_DENIED; + break; + + case ESRCH: + *rc = wxKILL_NO_PROCESS; + break; + + default: + // this goes against Unix98 docs so log it + wxLogDebug(_T("unexpected kill(2) return value %d"), err); + + // something else... + *rc = wxKILL_ERROR; + } + } + + return err; } #define WXEXECUTE_NARGS 127 @@ -205,159 +251,279 @@ long wxExecute( const wxString& command, bool sync, wxProcess *process ) return lRc; } -bool wxShell(const wxString& command) +// ---------------------------------------------------------------------------- +// wxShell +// ---------------------------------------------------------------------------- + +static wxString wxMakeShellCommand(const wxString& command) { wxString cmd; - if ( !!command ) - cmd.Printf(wxT("xterm -e %s"), command.c_str()); + if ( !command ) + { + // just an interactive shell + cmd = _T("xterm"); + } else - cmd = command; + { + // execute command in a shell + cmd << _T("/bin/sh -c '") << command << _T('\''); + } - return wxExecute(cmd) != 0; + return cmd; } -#if wxUSE_GUI +bool wxShell(const wxString& command) +{ + return wxExecute(wxMakeShellCommand(command), TRUE /* sync */) == 0; +} -void wxHandleProcessTermination(wxEndProcessData *proc_data) +bool wxShell(const wxString& command, wxArrayString& output) { - int pid = (proc_data->pid > 0) ? proc_data->pid : -(proc_data->pid); + wxCHECK_MSG( !!command, FALSE, _T("can't exec shell non interactively") ); - // 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; - int rc; + return wxExecute(wxMakeShellCommand(command), output); +} - // wait for child termination and if waitpid() was interrupted, try again - do +#if wxUSE_GUI + +void wxHandleProcessTermination(wxEndProcessData *proc_data) +{ + // notify user about termination if required + if ( proc_data->process ) { - rc = waitpid(pid, &status, 0); + proc_data->process->OnTerminate(proc_data->pid, proc_data->exitcode); } - while ( rc == -1 && errno == EINTR ); - - if( rc == -1 || ! (WIFEXITED(status) || WIFSIGNALED(status)) ) + // clean up + if ( proc_data->pid > 0 ) { - wxLogSysError(_("Waiting for subprocess termination failed")); - /* AFAIK, this can only happen if something went wrong within - wxGTK, i.e. due to a race condition or some serious bug. - After having fixed the order of statements in - GTK_EndProcessDetector(). (KB) - */ + delete proc_data; } else { - // notify user about termination if required - if (proc_data->process) - { - proc_data->process->OnTerminate(proc_data->pid, - WEXITSTATUS(status)); - } - // clean up - if ( proc_data->pid > 0 ) - { - delete proc_data; - } - else - { - // wxExecute() will know about it - proc_data->exitcode = status; - - proc_data->pid = 0; - } + // let wxExecute() know that the process has terminated + proc_data->pid = 0; } } #endif // wxUSE_GUI -#if wxUSE_GUI - #define WXUNUSED_UNLESS_GUI(p) p -#else - #define WXUNUSED_UNLESS_GUI(p) -#endif +// ---------------------------------------------------------------------------- +// wxStream classes to support IO redirection in wxExecute +// ---------------------------------------------------------------------------- -// New wxStream classes to clean up the data when the process terminates +#if wxUSE_STREAMS -#if wxUSE_GUI -class wxProcessFileInputStream: public wxInputStream { - public: - wxProcessFileInputStream(int fd); - ~wxProcessFileInputStream(); +class wxProcessFileInputStream : public wxInputStream +{ +public: + wxProcessFileInputStream(int fd) { m_fd = fd; } + ~wxProcessFileInputStream() { close(m_fd); } + + virtual bool Eof() const; - protected: +protected: size_t OnSysRead(void *buffer, size_t bufsize); - protected: +protected: int m_fd; }; -class wxProcessFileOutputStream: public wxOutputStream { - public: - wxProcessFileOutputStream(int fd); - ~wxProcessFileOutputStream(); +class wxProcessFileOutputStream : public wxOutputStream +{ +public: + wxProcessFileOutputStream(int fd) { m_fd = fd; } + ~wxProcessFileOutputStream() { close(m_fd); } - protected: +protected: size_t OnSysWrite(const void *buffer, size_t bufsize); - protected: +protected: int m_fd; }; -wxProcessFileInputStream::wxProcessFileInputStream(int fd) +bool wxProcessFileInputStream::Eof() const { - m_fd = fd; -} + if ( m_lasterror == wxSTREAM_EOF ) + return TRUE; -wxProcessFileInputStream::~wxProcessFileInputStream() -{ - close(m_fd); + // check if there is any input available + struct timeval tv; + tv.tv_sec = 0; + tv.tv_usec = 0; + + fd_set readfds; + FD_ZERO(&readfds); + FD_SET(m_fd, &readfds); + switch ( select(m_fd + 1, &readfds, NULL, NULL, &tv) ) + { + case -1: + wxLogSysError(_("Impossible to get child process input")); + // fall through + + case 0: + return TRUE; + + default: + wxFAIL_MSG(_T("unexpected select() return value")); + // still fall through + + case 1: + // input available: check if there is any + return wxInputStream::Eof(); + } } size_t wxProcessFileInputStream::OnSysRead(void *buffer, size_t bufsize) { - int ret; + 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; + } - ret = read(m_fd, buffer, bufsize); - m_lasterror = wxSTREAM_NOERROR; - if (ret == 0) - m_lasterror = wxSTREAM_EOF; - if (ret == -1) { - m_lasterror = wxSTREAM_READ_ERROR; - ret = 0; + 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; + } + return ret; } -wxProcessFileOutputStream::wxProcessFileOutputStream(int fd) +// ---------------------------------------------------------------------------- +// wxStreamTempBuffer +// ---------------------------------------------------------------------------- + +/* + 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 { - m_fd = fd; +public: + wxStreamTempBuffer(); + + // call to associate a stream with this buffer, otherwise nothing happens + // at all + void Init(wxInputStream *stream); + + // check for input on our stream and cache it in our buffer if any + void Update(); + + ~wxStreamTempBuffer(); + +private: + // the stream we're buffering, if NULL we don't do anything at all + wxInputStream *m_stream; + + // the buffer of size m_size (NULL if m_size == 0) + void *m_buffer; + + // the size of the buffer + size_t m_size; +}; + +wxStreamTempBuffer::wxStreamTempBuffer() +{ + m_stream = NULL; + m_buffer = NULL; + m_size = 0; } -wxProcessFileOutputStream::~wxProcessFileOutputStream() +void wxStreamTempBuffer::Init(wxInputStream *stream) { - close(m_fd); + m_stream = stream; } -size_t wxProcessFileOutputStream::OnSysWrite(const void *buffer, size_t bufsize) +void wxStreamTempBuffer::Update() { - int ret; + if ( m_stream && !m_stream->Eof() ) + { + // realloc in blocks of 1Kb - surely not the best strategy but which + // one is? + static const size_t incSize = 1024; + + 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; + } + } +} - ret = write(m_fd, buffer, bufsize); - m_lasterror = wxSTREAM_NOERROR; - if (ret == -1) { - m_lasterror = wxSTREAM_WRITE_ERROR; - ret = 0; +wxStreamTempBuffer::~wxStreamTempBuffer() +{ + if ( m_buffer ) + { + m_stream->Ungetch(m_buffer, m_size); + free(m_buffer); } - return ret; } -#endif - +#endif // wxUSE_STREAMS + long wxExecute(wxChar **argv, bool sync, - wxProcess * WXUNUSED_UNLESS_GUI(process)) + wxProcess *process) { - wxCHECK_MSG( *argv, 0, wxT("can't exec empty command") ); + // 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 ((sync) ? -1 : 0) + + wxCHECK_MSG( *argv, ERROR_RETURN_CODE, wxT("can't exec empty command") ); #if wxUSE_UNICODE int mb_argc = 0; @@ -365,9 +531,9 @@ long wxExecute(wxChar **argv, while (argv[mb_argc]) { - wxWX2MBbuf mb_arg = wxConvertWX2MB(argv[mb_argc]); - mb_argv[mb_argc] = strdup(mb_arg); - mb_argc++; + wxWX2MBbuf mb_arg = wxConvertWX2MB(argv[mb_argc]); + mb_argv[mb_argc] = strdup(mb_arg); + mb_argc++; } mb_argv[mb_argc] = (char *) NULL; @@ -385,35 +551,44 @@ long wxExecute(wxChar **argv, #if wxUSE_GUI // create pipes int end_proc_detect[2]; - if (pipe(end_proc_detect) == -1) + if ( pipe(end_proc_detect) == -1 ) { wxLogSysError( _("Pipe creation failed") ); + wxLogError( _("Failed to execute '%s'\n"), *argv ); ARGS_CLEANUP; - return 0; + return ERROR_RETURN_CODE; } #endif // wxUSE_GUI -#if wxUSE_GUI - int in_pipe[2] = { -1, -1 }; - int out_pipe[2] = { -1, -1 }; - // Only asynchronous mode is interresting - if (!sync && process && process->NeedPipe()) + // 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; + + if ( process && process->IsRedirected() ) { - if (pipe(in_pipe) == -1 || pipe(out_pipe) == -1) + if ( pipe(pipeIn) == -1 || pipe(pipeOut) == -1 || pipe(pipeErr) == -1 ) { - /* Free fds */ +#if wxUSE_GUI + // free previously allocated resources close(end_proc_detect[0]); close(end_proc_detect[1]); - wxLogSysError( _("Pipe creation failed (Console pipes)") ); +#endif // wxUSE_GUI + + wxLogSysError( _("Pipe creation failed") ); + wxLogError( _("Failed to execute '%s'\n"), *argv ); ARGS_CLEANUP; - return 0; + return ERROR_RETURN_CODE; } } -#endif // wxUSE_GUI // fork the process #ifdef HAVE_VFORK @@ -421,96 +596,142 @@ long wxExecute(wxChar **argv, #else pid_t pid = fork(); #endif - if (pid == -1) + + if ( pid == -1 ) // error? { #if wxUSE_GUI close(end_proc_detect[0]); close(end_proc_detect[1]); - close(in_pipe[0]); - close(in_pipe[1]); - close(out_pipe[0]); - close(out_pipe[1]); -#endif + 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; - return 0; + return ERROR_RETURN_CODE; } - else if (pid == 0) + else if ( pid == 0 ) // we're in child { #if wxUSE_GUI - // we're in child close(end_proc_detect[0]); // close reading side #endif // wxUSE_GUI - // These three lines close the open file descriptors to to avoid any + // 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 (sync == 0) + // one wants proper IO for the subprocess, the right thing to do is to + // start an xterm executing it. + if ( !sync ) { - // leave stderr opened, it won't do any hurm for ( int fd = 0; fd < FD_SETSIZE; fd++ ) { + if ( fd == pipeIn[0] || fd == pipeOut[1] || fd == pipeErr[1] #if wxUSE_GUI - if ( fd == end_proc_detect[1] || fd == in_pipe[0] || fd == out_pipe[1] ) - continue; + || fd == end_proc_detect[1] #endif // wxUSE_GUI + ) + { + // don't close this one, we still need it + continue; + } + // leave stderr opened too, it won't do any hurm if ( fd != STDERR_FILENO ) close(fd); } } - // Fake a console by duplicating pipes -#if wxUSE_GUI - if (in_pipe[0] != -1) { - dup2(in_pipe[0], STDIN_FILENO); - dup2(out_pipe[1], STDOUT_FILENO); - close(in_pipe[0]); - close(out_pipe[1]); - } -#endif // wxUSE_GUI - -#if 0 - close(STDERR_FILENO); + // redirect stdio, stdout and stderr + if ( pipeIn[0] != -1 ) + { + if ( dup2(pipeIn[0], STDIN_FILENO) == -1 || + dup2(pipeOut[1], STDOUT_FILENO) == -1 || + dup2(pipeErr[1], STDERR_FILENO) == -1 ) + { + wxLogSysError(_("Failed to redirect child process input/output")); + } - // 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 + close(pipeIn[0]); + close(pipeOut[1]); + close(pipeErr[1]); + } execvp (*mb_argv, mb_argv); // there is no return after successful exec() - wxFprintf(stderr, _("Can't execute '%s'\n"), *argv); - _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? +#if defined(__VMS) || defined(__INTEL_COMPILER) + return 0; +#endif } - else + else // we're in parent { -#if wxUSE_GUI - wxEndProcessData *data = new wxEndProcessData; - ARGS_CLEANUP; + // pipe initialization: construction of the wxStreams +#if wxUSE_STREAMS + wxStreamTempBuffer bufIn, 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]); + + process->SetPipeStreams(inStream, outStream, errStream); + + bufIn.Init(inStream); + bufErr.Init(inStream); +#endif // wxUSE_STREAMS + + close(pipeIn[0]); // close reading side + close(pipeOut[1]); // close writing side + close(pipeErr[1]); // close writing side + } + +#if wxUSE_GUI && !defined(__WXMICROWIN__) + wxEndProcessData *data = new wxEndProcessData; + if ( sync ) { - wxASSERT_MSG( !process, wxT("wxProcess param ignored for sync exec") ); + // we may have process for capturing the program output, but it's + // not used in wxEndProcessData in the case of sync execution data->process = NULL; // sync execution: indicate it by negating the pid - data->pid = -pid; - data->tag = wxAddProcessCallback(data, end_proc_detect[0]); - // we're in parent + data->pid = -pid; + data->tag = wxAddProcessCallback(data, end_proc_detect[0]); + close(end_proc_detect[1]); // close writing side - // it will be set to 0 from GTK_EndProcessDetector - while (data->pid != 0) + wxBusyCursor bc; + wxWindowDisabler wd; + + // data->pid will be set to 0 from GTK_EndProcessDetector when the + // process terminates + while ( data->pid != 0 ) + { +#if wxUSE_STREAMS + bufIn.Update(); + bufErr.Update(); +#endif // wxUSE_STREAMS + + // give GTK+ a chance to call GTK_EndProcessDetector here and + // also repaint the GUI wxYield(); + } int exitcode = data->exitcode; @@ -518,29 +739,15 @@ long wxExecute(wxChar **argv, return exitcode; } - else + else // async execution { - // pipe initialization: construction of the wxStreams - if (process && process->NeedPipe()) { - // These two streams are relative to this process. - wxOutputStream *my_output_stream; - wxInputStream *my_input_stream; - - my_output_stream = new wxProcessFileOutputStream(in_pipe[1]); - my_input_stream = new wxProcessFileInputStream(out_pipe[0]); - close(in_pipe[0]); // close reading side - close(out_pipe[1]); // close writing side - - process->SetPipeStreams(my_input_stream, my_output_stream); - } - // async execution, nothing special to do - caller will be // notified about the process termination if process != NULL, data // will be deleted in GTK_EndProcessDetector data->process = process; data->pid = pid; data->tag = wxAddProcessCallback(data, end_proc_detect[0]); - // we're in parent + close(end_proc_detect[1]); // close writing side return pid; @@ -557,11 +764,11 @@ long wxExecute(wxChar **argv, return exitcode; #endif // wxUSE_GUI } - return 0; - - #undef ARGS_CLEANUP } +#undef ERROR_RETURN_CODE +#undef ARGS_CLEANUP + // ---------------------------------------------------------------------------- // file and directory functions // ---------------------------------------------------------------------------- @@ -569,9 +776,14 @@ long wxExecute(wxChar **argv, const wxChar* wxGetHomeDir( wxString *home ) { *home = wxGetUserHome( wxString() ); + wxString tmp; if ( home->IsEmpty() ) *home = wxT("/"); - +#ifdef __VMS + tmp = *home; + if ( tmp.Last() != wxT(']')) + if ( tmp.Last() != wxT('/')) *home << wxT('/'); +#endif return home->c_str(); } @@ -716,7 +928,7 @@ bool wxGetUserName(wxChar *buf, int sz) if ((who = getpwuid (getuid ())) != NULL) { // pw_gecos field in struct passwd is not standard -#if HAVE_PW_GECOS +#ifdef HAVE_PW_GECOS char *comma = strchr(who->pw_gecos, ','); if (comma) *comma = '\0'; // cut off non-name comment fields @@ -739,6 +951,203 @@ wxString wxGetOsDescription() #endif } +// this function returns the GUI toolkit version in GUI programs, but OS +// version in non-GUI ones +#if !wxUSE_GUI + +int wxGetOsVersion(int *majorVsn, int *minorVsn) +{ + int major, minor; + char name[256]; + + if ( sscanf(WXWIN_OS_DESCRIPTION, "%s %d.%d", name, &major, &minor) != 3 ) + { + // unreckognized uname string format + major = minor = -1; + } + + if ( majorVsn ) + *majorVsn = major; + if ( minorVsn ) + *minorVsn = minor; + + return wxUNIX; +} + +#endif // !wxUSE_GUI + +long wxGetFreeMemory() +{ +#if defined(__LINUX__) + // get it from /proc/meminfo + FILE *fp = fopen("/proc/meminfo", "r"); + if ( fp ) + { + long memFree = -1; + + char buf[1024]; + if ( fgets(buf, WXSIZEOF(buf), fp) && fgets(buf, WXSIZEOF(buf), fp) ) + { + long memTotal, memUsed; + sscanf(buf, "Mem: %ld %ld %ld", &memTotal, &memUsed, &memFree); + } + + fclose(fp); + + return memFree; + } +#elif defined(__SUN__) && defined(_SC_AVPHYS_PAGES) + return 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; +} + +bool wxGetDiskSpace(const wxString& path, wxLongLong *pTotal, wxLongLong *pFree) +{ +#ifdef HAVE_STATFS + + struct statfs fs; + if ( statfs(path, &fs) != 0 ) + { + wxLogSysError("Failed to get file system statistics"); + + return FALSE; + } + + if ( pTotal ) + { + *pTotal = wxLongLong(fs.f_blocks) * fs.f_bsize; + } + + if ( pFree ) + { + *pFree = wxLongLong(fs.f_bavail) * fs.f_bsize; + } + + return TRUE; +#endif // HAVE_STATFS + + return FALSE; +} + +// ---------------------------------------------------------------------------- +// env vars +// ---------------------------------------------------------------------------- + +bool wxGetEnv(const wxString& var, wxString *value) +{ + // wxGetenv is defined as getenv() + wxChar *p = wxGetenv(var); + if ( !p ) + return FALSE; + + if ( value ) + { + *value = p; + } + + return TRUE; +} + +bool wxSetEnv(const wxString& variable, const wxChar *value) +{ +#if defined(HAVE_SETENV) + return setenv(variable.mb_str(), value ? wxString(value).mb_str().data() + : NULL, 1 /* overwrite */) == 0; +#elif defined(HAVE_PUTENV) + wxString s = variable; + if ( value ) + s << _T('=') << value; + + // transform to ANSI + const char *p = s.mb_str(); + + // the string will be free()d by libc + char *buf = (char *)malloc(strlen(p) + 1); + strcpy(buf, p); + + return putenv(buf) == 0; +#else // no way to set an env var + return FALSE; +#endif +} + +// ---------------------------------------------------------------------------- +// signal handling +// ---------------------------------------------------------------------------- + +#if wxUSE_ON_FATAL_EXCEPTION + +#include + +static void wxFatalSignalHandler(wxTYPE_SA_HANDLER) +{ + if ( wxTheApp ) + { + // give the user a chance to do something special about this + wxTheApp->OnFatalException(); + } + + 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 ) + { + // 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; + + 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 ) + { + wxLogDebug(_T("Failed to install our signal handler.")); + } + + 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(_T("Failed to uninstall our signal handler.")); + } + + s_savedHandlers = FALSE; + } + //else: nothing to do + + return ok; +} + +#endif // wxUSE_ON_FATAL_EXCEPTION + // ---------------------------------------------------------------------------- // error and debug output routines (deprecated, use wxLog) // ----------------------------------------------------------------------------