X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/3bbd09c34c773caa1210ffd441059c05b94cbbbc..977c53206a4be411999140b514507e161e1f0a04:/src/unix/utilsunx.cpp diff --git a/src/unix/utilsunx.cpp b/src/unix/utilsunx.cpp index 305c194cf7..ec550fcf24 100644 --- a/src/unix/utilsunx.cpp +++ b/src/unix/utilsunx.cpp @@ -1,6 +1,6 @@ ///////////////////////////////////////////////////////////////////////////// // 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 @@ -39,6 +39,8 @@ #include "wx/process.h" #include "wx/thread.h" +#include "wx/cmdline.h" + #include "wx/wfstream.h" #include "wx/private/selectdispatcher.h" @@ -57,15 +59,15 @@ # include #endif -#define HAS_PIPE_INPUT_STREAM (wxUSE_STREAMS && wxUSE_FILE) +#define HAS_PIPE_STREAMS (wxUSE_STREAMS && wxUSE_FILE) -#if HAS_PIPE_INPUT_STREAM +#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_INPUT_STREAM +#endif // HAS_PIPE_STREAMS #if defined(__MWERKS__) && defined(__MACH__) #ifndef WXWIN_OS_DESCRIPTION @@ -200,7 +202,7 @@ void wxMicroSleep(unsigned long microseconds) tmReq.tv_nsec = (microseconds % 1000000) * 1000; // we're not interested in remaining time nor in return value - (void)nanosleep(&tmReq, (timespec *)NULL); + (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() @@ -253,7 +255,7 @@ int wxKill(long pid, wxSignal sig, wxKillError *rc, int flags) default: // this goes against Unix98 docs so log it - wxLogDebug(_T("unexpected kill(2) return value %d"), err); + wxLogDebug(wxT("unexpected kill(2) return value %d"), err); // something else... *rc = wxKILL_ERROR; @@ -263,106 +265,119 @@ int wxKill(long pid, wxSignal sig, wxKillError *rc, int flags) return err; } -#define WXEXECUTE_NARGS 127 +// Shutdown or reboot the PC +bool wxShutdown(int flags) +{ + flags &= ~wxSHUTDOWN_FORCE; -#if defined(__DARWIN__) -long wxMacExecute(wxChar **argv, - int flags, - wxProcess *process); -#endif + wxChar level; + switch ( flags ) + { + case wxSHUTDOWN_POWEROFF: + level = wxT('0'); + break; -long wxExecute( const wxString& command, int flags, wxProcess *process ) -{ - wxCHECK_MSG( !command.empty(), 0, wxT("can't exec empty command") ); + case wxSHUTDOWN_REBOOT: + level = wxT('6'); + break; - wxLogTrace(wxT("exec"), wxT("Executing \"%s\""), command.c_str()); + case wxSHUTDOWN_LOGOFF: + // TODO: use dcop to log off? + return false; -#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 + default: + wxFAIL_MSG( wxT("unknown wxShutdown() flag") ); + return false; + } - 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; + return system(wxString::Format("init %c", level).mb_str()) == 0; +} - // split the command line in arguments - do - { - argument = wxEmptyString; - quotechar = wxT('\0'); +// ---------------------------------------------------------------------------- +// wxStream classes to support IO redirection in wxExecute +// ---------------------------------------------------------------------------- - // eat leading whitespace: - while ( wxIsspace(*cptr) ) - cptr++; +#if HAS_PIPE_STREAMS - if ( *cptr == wxT('\'') || *cptr == wxT('"') ) - quotechar = *cptr++; +bool wxPipeInputStream::CanRead() const +{ + if ( m_lasterror == wxSTREAM_EOF ) + return false; - do - { - if ( *cptr == wxT('\\') && ! escaped ) - { - escaped = true; - cptr++; - continue; - } + // check if there is any input available + struct timeval tv; + tv.tv_sec = 0; + tv.tv_usec = 0; - // all other characters: - argument += *cptr++; - escaped = false; + const int fd = m_file->fd(); - // 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") ); + fd_set readfds; - argv[argc] = new wxChar[argument.length() + 1]; - wxStrcpy(argv[argc], argument.c_str()); - argc++; + wxFD_ZERO(&readfds); + wxFD_SET(fd, &readfds); - // if not at end of buffer, swallow last character: - if(*cptr) - cptr++; + switch ( select(fd + 1, &readfds, NULL, NULL, &tv) ) + { + case -1: + wxLogSysError(_("Impossible to get child process input")); + // fall through - break; // done with this one, start over - } - } while(*cptr); - } while(*cptr); - argv[argc] = NULL; + case 0: + return false; - 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 + default: + wxFAIL_MSG(wxT("unexpected select() return value")); + // still fall through - // do execute the command - lRc = 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(); + } +} - // clean up - argc = 0; - while( argv[argc] ) - delete [] argv[argc++]; +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 lRc; + return ret; } +#endif // HAS_PIPE_STREAMS + // ---------------------------------------------------------------------------- // wxShell // ---------------------------------------------------------------------------- @@ -373,12 +388,12 @@ static wxString wxMakeShellCommand(const wxString& command) if ( !command ) { // just an interactive shell - cmd = _T("xterm"); + cmd = wxT("xterm"); } else { // execute command in a shell - cmd << _T("/bin/sh -c '") << command << _T('\''); + cmd << wxT("/bin/sh -c '") << command << wxT('\''); } return cmd; @@ -391,84 +406,105 @@ bool wxShell(const wxString& command) bool wxShell(const wxString& command, wxArrayString& output) { - wxCHECK_MSG( !command.empty(), false, _T("can't exec shell non interactively") ); + wxCHECK_MSG( !command.empty(), false, wxT("can't exec shell non interactively") ); 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] ) + 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(); + wxDECLARE_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, + const wxExecuteEnv *env) +{ + 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, env); +} - 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, + const wxExecuteEnv *env) +{ + ArgsArray argv(wargv); + + return wxExecute(argv, flags, process, env); } -#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, + 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 @@ -479,38 +515,29 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process) 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(), + wxT("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; @@ -520,8 +547,6 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process) { wxLogError( _("Failed to execute '%s'\n"), *argv ); - ARGS_CLEANUP; - return ERROR_RETURN_CODE; } @@ -536,8 +561,6 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process) { wxLogError( _("Failed to execute '%s'\n"), *argv ); - ARGS_CLEANUP; - return ERROR_RETURN_CODE; } } @@ -557,36 +580,14 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process) { 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] - || fd == (execData.pipeEndProcDetect)[wxPipe::Write] ) - { - // 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 ) @@ -597,12 +598,6 @@ long wxExecute(wxChar **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(); - // redirect stdin, stdout and stderr if ( pipeIn.IsOk() ) { @@ -618,12 +613,78 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process) pipeErr.Close(); } - execvp (*mb_argv, mb_argv); + // 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 ) + { + // 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); + + // 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("); - // 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() @@ -641,14 +702,14 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process) } else // we're in parent { - ARGS_CLEANUP; - // save it for WaitForChild() use execData.pid = pid; + if (execData.process) + execData.process->SetPid(pid); // and also in the wxProcess // prepare for IO redirection -#if HAS_PIPE_INPUT_STREAM +#if HAS_PIPE_STREAMS // the input buffer bufOut is connected to stdout, this is why it is // called bufOut and not bufIn wxStreamTempInputBuffer bufOut, @@ -656,8 +717,24 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process) if ( process && process->IsRedirected() ) { + // 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 + } + 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); @@ -676,7 +753,7 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process) execData.fdOut = fdOut; execData.fdErr = fdErr; } -#endif // HAS_PIPE_INPUT_STREAM +#endif // HAS_PIPE_STREAMS if ( pipeIn.IsOk() ) { @@ -685,6 +762,13 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process) 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); } @@ -694,7 +778,6 @@ long wxExecute(wxChar **argv, int flags, wxProcess *process) } #undef ERROR_RETURN_CODE -#undef ARGS_CLEANUP // ---------------------------------------------------------------------------- // file and directory functions @@ -758,7 +841,7 @@ static wxString wxGetCommandOutput(const wxString &cmd) FILE *f = popen(cmd.ToAscii(), "r"); if ( !f ) { - wxLogSysError(_T("Executing \"%s\" failed"), cmd.c_str()); + wxLogSysError(wxT("Executing \"%s\" failed"), cmd.c_str()); return wxEmptyString; } @@ -774,7 +857,7 @@ static wxString wxGetCommandOutput(const wxString &cmd) pclose(f); - if ( !s.empty() && s.Last() == _T('\n') ) + if ( !s.empty() && s.Last() == wxT('\n') ) s.RemoveLast(); return s; @@ -795,16 +878,14 @@ static bool wxGetHostNameInternal(wxChar *buf, int sz) 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")); @@ -857,7 +938,7 @@ bool wxGetFullHostName(wxChar *buf, int sz) 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) @@ -873,7 +954,7 @@ bool wxGetUserId(wxChar *buf, int sz) *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; } @@ -891,7 +972,7 @@ bool wxGetUserName(wxChar *buf, int sz) 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; } @@ -911,7 +992,26 @@ bool wxIsPlatform64Bit() machine.Contains(wxT("alpha")); } -// these functions are in mac/utils.cpp for wxMac +#ifdef __LINUX__ +wxLinuxDistributionInfo wxGetLinuxDistributionInfo() +{ + 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 + +// these functions are in src/osx/utilsexc_base.cpp for wxMac #ifndef __WXMAC__ wxOperatingSystemId wxGetOsVersion(int *verMaj, int *verMin) @@ -1114,7 +1214,7 @@ static bool wxDoSetEnv(const wxString& variable, const char *value) #elif defined(HAVE_PUTENV) wxString s = variable; if ( value ) - s << _T('=') << value; + s << wxT('=') << value; // transform to ANSI const wxWX2MBbuf p = s.mb_str(); @@ -1197,7 +1297,7 @@ bool wxHandleFatalExceptions(bool doit) ok &= sigaction(SIGSEGV, &act, &s_handlerSEGV) == 0; if ( !ok ) { - wxLogDebug(_T("Failed to install our signal handler.")); + wxLogDebug(wxT("Failed to install our signal handler.")); } s_savedHandlers = true; @@ -1211,7 +1311,7 @@ bool wxHandleFatalExceptions(bool doit) ok &= sigaction(SIGSEGV, &s_handlerSEGV, NULL) == 0; if ( !ok ) { - wxLogDebug(_T("Failed to uninstall our signal handler.")); + wxLogDebug(wxT("Failed to uninstall our signal handler.")); } s_savedHandlers = false; @@ -1234,47 +1334,11 @@ int wxAppTraits::AddProcessCallback(wxEndProcessData *data, int fd) { 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); @@ -1283,6 +1347,9 @@ int wxAppTraits::AddProcessCallback(wxEndProcessData *data, int fd) delete this; } + virtual void OnWriteWaiting() { wxFAIL_MSG("unreachable"); } + virtual void OnExceptionWaiting() { wxFAIL_MSG("unreachable"); } + wxEndProcessData * const m_data; const int m_fd; }; @@ -1291,14 +1358,14 @@ int wxAppTraits::AddProcessCallback(wxEndProcessData *data, int fd) ( fd, new wxEndProcessFDIOHandler(data, fd), - wxFDIO_EXCEPTION + wxFDIO_INPUT ); return fd; // unused, but return something unique for the tag } bool wxAppTraits::CheckForRedirectedIO(wxExecuteData& execData) { -#if HAS_PIPE_INPUT_STREAM +#if HAS_PIPE_STREAMS bool hasIO = false; if ( execData.bufOut && execData.bufOut->Update() ) @@ -1308,11 +1375,21 @@ bool wxAppTraits::CheckForRedirectedIO(wxExecuteData& execData) hasIO = true; return hasIO; -#else // !HAS_PIPE_INPUT_STREAM +#else // !HAS_PIPE_STREAMS + wxUnusedVar(execData); + return false; -#endif // HAS_PIPE_INPUT_STREAM/!HAS_PIPE_INPUT_STREAM +#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: @@ -1322,17 +1399,17 @@ public: disp.RegisterFD(fd, this, wxFDIO_INPUT); } - int GetFD() const { return m_fd; } - virtual void OnWriteWaiting() { wxFAIL_MSG("unreachable"); } virtual void OnExceptionWaiting() { wxFAIL_MSG("unreachable"); } -private: +protected: const int m_fd; - DECLARE_NO_COPY_CLASS(wxReadFDIOHandler) + 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: @@ -1349,11 +1426,16 @@ public: private: bool m_terminated; - DECLARE_NO_COPY_CLASS(wxEndHandler) + wxDECLARE_NO_COPY_CLASS(wxEndHandler); }; -#if wxUSE_STREAMS +#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: @@ -1373,29 +1455,91 @@ public: private: wxStreamTempInputBuffer * const m_buf; - DECLARE_NO_COPY_CLASS(wxRedirectedIOHandler) + wxDECLARE_NO_COPY_CLASS(wxRedirectedIOHandler); }; -#endif // wxUSE_STREAMS +#endif // HAS_PIPE_STREAMS + +// 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" ); + + // 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 + { + wxLogError("Child process (PID %d) exited for unknown reason, " + "status = %d", pid, status); + exitcode = -1; + } + + return exitcode; + } + + return -1; +} + +} // anonymous namespace int wxAppTraits::WaitForChild(wxExecuteData& execData) { if ( !(execData.flags & wxEXEC_SYNC) ) { - // asynchronous execution: just launch the process and return + // 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.GetEndProcReadFD() ); + endProcData->async = true; return execData.pid; } + //else: synchronous execution case -#if wxUSE_STREAMS +#if HAS_PIPE_STREAMS && wxUSE_SOCKETS wxProcess * const process = execData.process; if ( process && process->IsRedirected() ) { @@ -1419,83 +1563,31 @@ int wxAppTraits::WaitForChild(wxExecuteData& execData) } } //else: no IO redirection, just block waiting for the child to exit -#endif // wxUSE_STREAMS - - 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 ( result == -1 ) - { - wxLogLastError("waitpid"); - } - 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" ); - } - } - - wxLogSysError(_("Waiting for subprocess termination failed")); +#endif // HAS_PIPE_STREAMS - return -1; + 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; } }