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#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#ifndef __MINGW32__
#include <sys/wait.h>
#endif
#include "gis.h"
#include "glocale.h"
/****************************************************************
* G_system (command)
* char *command;
*
* This is essentially the UNIX system() call, except for the signal
* handling. During the call, user generated signals (intr, quit)
* for the parent are ignored, but allowed for the child. Parent
* signals are reset upon completion.
*
* This routine is useful for menu type programs that need to run
* external commands and allow these commands to be interrupted by
* the user without killing the menu itself.
*
* Note: if you want the signal settings to be the same for the
* parent and the command being run, set them yourself and use
* the UNIX system() call instead.
****************************************************************/
#include <signal.h>
#include <stdio.h>
/*!
* \brief run a shell level command
*
* The shell level
* <b>command</b> is executed. Interrupt signals for the parent module are
* ignored during the call. Interrupt signals for the <b>command</b> are
* enabled. The interrupt signals for the parent are restored to their previous
* settings upon return.
* G_system(~) returns the same value as system(~), which is essentially the
* exit status of the <b>command.</b> See UNIX manual system(1) for details.
*
* \param command
* \return int
*/
int G_system ( char *command)
{
int status, pid, w;
void (*sigint)()
#ifdef SIGQUIT
, (*sigquit)()
#endif
;
sigint = signal (SIGINT, SIG_IGN);
#ifdef SIGQUIT
sigquit = signal (SIGQUIT, SIG_IGN);
#endif
fflush (stdout);
fflush (stderr);
#ifdef __MINGW32__
signal (SIGINT, SIG_DFL);
_spawnl ( P_WAIT,
"command",
"command",
"/c",
command,
NULL );
#else
if ( (pid = fork()) == 0)
{
signal (SIGINT, SIG_DFL);
signal (SIGQUIT, SIG_DFL);
execl ("/bin/sh", "sh", "-c", command, 0);
_exit(127);
}
if (pid < 0)
{
fprintf (stderr, _("WARNING: can not create a new process\n"));
status = -1;
}
else
{
while ( (w = wait (&status)) != pid && w != -1);
if (w == -1)
status = -1;
}
#endif
signal (SIGINT, sigint);
#ifdef SIGQUIT
signal (SIGQUIT, sigquit);
#endif
return (status);
}
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