/////////////////////////////////////////////////////////////////////////////
// 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 <sys/select.h>
#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
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()
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;
switch ( flags )
{
case wxSHUTDOWN_POWEROFF:
- level = _T('0');
+ level = wxT('0');
break;
case wxSHUTDOWN_REBOOT:
- level = _T('6');
+ level = wxT('6');
break;
case wxSHUTDOWN_LOGOFF:
return false;
default:
- wxFAIL_MSG( _T("unknown wxShutdown() flag") );
+ wxFAIL_MSG( wxT("unknown wxShutdown() flag") );
return false;
}
// wxStream classes to support IO redirection in wxExecute
// ----------------------------------------------------------------------------
-#if HAS_PIPE_INPUT_STREAM
+#if HAS_PIPE_STREAMS
bool wxPipeInputStream::CanRead() const
{
return false;
default:
- wxFAIL_MSG(_T("unexpected select() return value"));
+ wxFAIL_MSG(wxT("unexpected select() return value"));
// still fall through
case 1:
}
}
-#endif // HAS_PIPE_INPUT_STREAM
+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
// ----------------------------------------------------------------------------
// wxShell
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;
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);
}
ArgsArray(wchar_t **wargv)
{
int argc = 0;
- while ( *wargv++ )
+ while ( wargv[argc] )
argc++;
Init(argc);
int m_argc;
char **m_argv;
- DECLARE_NO_COPY_CLASS(ArgsArray)
+ wxDECLARE_NO_COPY_CLASS(ArgsArray);
};
} // anonymous namespace
bool wxMacLaunch(char **argv);
#endif
-long wxExecute(const wxString& command, int flags, wxProcess *process)
+long wxExecute(const wxString& command, int flags, wxProcess *process,
+ const wxExecuteEnv *env)
{
ArgsArray argv(wxCmdLineParser::ConvertStringToArgs(command,
wxCMD_LINE_SPLIT_UNIX));
- return wxExecute(argv, flags, process);
+ return wxExecute(argv, flags, process, env);
}
#if wxUSE_UNICODE
-long wxExecute(wchar_t **wargv, int flags, wxProcess *process)
+long wxExecute(wchar_t **wargv, int flags, wxProcess *process,
+ const wxExecuteEnv *env)
{
ArgsArray argv(wargv);
- return wxExecute(argv, flags, process);
+ return wxExecute(argv, flags, process, env);
}
#endif // wxUSE_UNICODE
// wxExecute: the real worker function
-long wxExecute(char **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
// 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") );
+ wxT("wxExecute() can be called only from the main thread") );
#endif // wxUSE_THREADS
#if defined(__WXCOCOA__) || ( defined(__WXOSX_MAC__) && wxOSX_USE_COCOA_OR_CARBON )
}
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 )
}
#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() )
{
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 )
+ {
+ // 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(");
{
// 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,
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."));
+ wxLog::FlushActive();
+ }
+
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);
execData.fdOut = fdOut;
execData.fdErr = fdErr;
}
-#endif // HAS_PIPE_INPUT_STREAM
+#endif // HAS_PIPE_STREAMS
if ( pipeIn.IsOk() )
{
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;
}
pclose(f);
- if ( !s.empty() && s.Last() == _T('\n') )
+ if ( !s.empty() && s.Last() == wxT('\n') )
s.RemoveLast();
return s;
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)
#elif defined(HAVE_PUTENV)
wxString s = variable;
if ( value )
- s << _T('=') << value;
+ s << wxT('=') << value;
// transform to ANSI
const wxWX2MBbuf p = s.mb_str();
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;
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;
bool wxAppTraits::CheckForRedirectedIO(wxExecuteData& execData)
{
-#if HAS_PIPE_INPUT_STREAM
+#if HAS_PIPE_STREAMS
bool hasIO = false;
if ( execData.bufOut && execData.bufOut->Update() )
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()
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
private:
bool m_terminated;
- DECLARE_NO_COPY_CLASS(wxEndHandler)
+ wxDECLARE_NO_COPY_CLASS(wxEndHandler);
};
-#if HAS_PIPE_INPUT_STREAM
+#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
private:
wxStreamTempInputBuffer * const m_buf;
- DECLARE_NO_COPY_CLASS(wxRedirectedIOHandler)
+ wxDECLARE_NO_COPY_CLASS(wxRedirectedIOHandler);
};
-#endif // HAS_PIPE_INPUT_STREAM
+#endif // HAS_PIPE_STREAMS
// helper function which calls waitpid() and analyzes the result
int DoWaitForChild(int pid, int flags = 0)
{
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) )
- return WEXITSTATUS(status);
+ exitcode = WEXITSTATUS(status);
else if ( WIFSIGNALED(status) )
- return -WTERMSIG(status);
+ exitcode = -WTERMSIG(status);
else
{
wxLogError("Child process (PID %d) exited for unknown reason, "
"status = %d", pid, status);
+ exitcode = -1;
}
+
+ return exitcode;
}
return -1;
}
//else: synchronous execution case
-#if HAS_PIPE_INPUT_STREAM
+#if HAS_PIPE_STREAMS && wxUSE_SOCKETS
wxProcess * const process = execData.process;
if ( process && process->IsRedirected() )
{
}
}
//else: no IO redirection, just block waiting for the child to exit
-#endif // HAS_PIPE_INPUT_STREAM
+#endif // HAS_PIPE_STREAMS
return DoWaitForChild(execData.pid);
}
projects / wxWidgets.git / blobdiff