async-system-wrapper.c

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////////////////////////////////////////////////////////////////////////
//
// Copyright (C) 2016-2021 The Octave Project Developers
//
// See the file COPYRIGHT.md in the top-level directory of this
// distribution or <https://octave.org/copyright/>.
//
// This file is part of Octave.
//
// Octave is free software: you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by
// the Free Software Foundation, either version 3 of the License, or
// (at your option) any later version.
//
// Octave is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with Octave; see the file COPYING.  If not, see
// <https://www.gnu.org/licenses/>.
//
////////////////////////////////////////////////////////////////////////
 
// areadlink is provided by gnulib.  We don't include gnulib headers
// directly in Octave's C++ source files to avoid problems that may be
// caused by the way that gnulib overrides standard library functions.
 
#if defined (HAVE_CONFIG_H)
#  include "config.h"
#endif
 
#if defined (__WIN32__) && ! defined (__CYGWIN__)
#  include <stdlib.h>
#  include <string.h>
#  define WIN32_LEAN_AND_MEAN 1
#  include <windows.h>
#else
#  include <sys/types.h>
#  include <unistd.h>
#endif
 
#include "async-system-wrapper.h"
 
pid_t
octave_async_system_wrapper (const char *cmd)
{
  int retval = -1;
 
  if (! cmd)
    return retval;
 
#if defined (OCTAVE_USE_WINDOWS_API)
 
  STARTUPINFO si;
  PROCESS_INFORMATION pi;
 
  ZeroMemory (&si, sizeof (si));
  ZeroMemory (&pi, sizeof (pi));
 
  char *xcmd = (char *) malloc (strlen (cmd) + 1);
 
  strcpy (xcmd, cmd);
 
  if (! CreateProcess (0, xcmd, 0, 0, FALSE, 0, 0, 0, &si, &pi))
    retval = -1;
  else
    {
      retval = pi.dwProcessId;
 
      CloseHandle (pi.hProcess);
      CloseHandle (pi.hThread);
    }
 
  free (xcmd);
 
#else
 
  pid_t pid = fork ();
 
  if (pid == 0)
    execl (SHELL_PATH, "sh", "-c", cmd, (char *) (0));
  else
    retval = pid;
 
#endif
 
  return retval;
}