gnome/gutil.c

   1 /* Various utilities - Unix variants
   2    Copyright (C) 1998 the Free Software Foundation.
   3
   4    Written 1998 by:
   5    Miguel de Icaza
   6
   7    This program is free software; you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation; either version 2 of the License, or
  10    (at your option) any later version.
  11
  12    This program is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with this program; if not, write to the Free Software
  19    Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.  */
  20
  21 #include <config.h>
  22 #include <stdio.h>
  23 #include <sys/types.h>
  24 #ifdef HAVE_UNISTD_H
  25 #include <unistd.h>
  26 #endif
  27 #include <fcntl.h>
  28 #include <signal.h>             /* my_system */
  29 #include <limits.h>             /* INT_MAX */
  30 #include <sys/time.h>           /* select: timeout */
  31 #include <sys/param.h>
  32 #include <sys/types.h>
  33 #include <sys/stat.h>
  34 #include <stdarg.h>
  35 #ifdef HAVE_SYS_WAIT_H
  36 #    include <sys/wait.h>       /* my_system */
  37 #endif
  38 #include <errno.h>              /* my_system */
  39 #include <pwd.h>
  40 #include <grp.h>
  41 #include <string.h>
  42 #include <ctype.h>
  43 #ifdef HAVE_SYS_SELECT_H
  44 #  include <sys/select.h>
  45 #endif
  46 #include <gnome.h>
  47 #include <X11/Xlib.h>
  48 #include <gdk/gdkprivate.h>
  49 #include "global.h"
  50
  51 int my_system (int flags, const char *shell, const char *command)
  52 {
  53         pid_t pid;
  54         struct sigaction ignore, save_intr, save_quit, save_stop;
  55         int status = 0, i;
  56
  57         ignore.sa_handler = SIG_IGN;
  58         sigemptyset (&ignore.sa_mask);
  59         ignore.sa_flags = 0;
  60
  61         sigaction (SIGINT, &ignore, &save_intr);
  62         sigaction (SIGQUIT, &ignore, &save_quit);
  63
  64         if ((pid = fork ()) < 0){
  65                 return -1;
  66         }
  67         if (pid == 0){
  68                 const int top = max_open_files ();
  69                 struct sigaction default_pipe;
  70
  71                 sigaction (SIGINT,  &save_intr, NULL);
  72                 sigaction (SIGQUIT, &save_quit, NULL);
  73
  74                 /*
  75                  * reset sigpipe
  76                  */
  77                 default_pipe.sa_handler = SIG_DFL;
  78                 sigemptyset (&default_pipe.sa_mask);
  79                 default_pipe.sa_flags = 0;
  80
  81                 sigaction (SIGPIPE, &default_pipe, NULL);
  82
  83                 for (i = 0; i < top; i++)
  84                         close (i);
  85
  86                 /* Setup the file descriptor for the child */
  87
  88                 /* stdin */
  89                 open ("/dev/null", O_RDONLY);
  90
  91                 /* stdout */
  92                 open ("/dev/null", O_WRONLY);
  93
  94                 /* stderr */
  95                 open ("/dev/null", O_WRONLY);
  96
  97                 if (!(flags & EXECUTE_WAIT))
  98                         pid = fork ();
  99
 100                 if (pid == 0){
 101                         if (flags & EXECUTE_AS_SHELL)
 102                                 execl (shell, shell, "-c", command, (char *) 0);
 103                         else
 104                                 execlp (shell, shell, command, (char *) 0);
 105                         /* See note below for why we use _exit () */
 106                         _exit (127);            /* Exec error */
 107                 } else {
 108                         int status;
 109
 110                         if (flags & EXECUTE_WAIT)
 111                                 waitpid (pid, &status, 0);
 112                 }
 113                 /* We need to use _exit instead of exit to avoid
 114                  * calling the atexit handlers (specifically the gdk atexit
 115                  * handler
 116                  */
 117                 _exit (0);
 118         }
 119         waitpid (pid, &status, 0);
 120         sigaction (SIGINT,  &save_intr, NULL);
 121         sigaction (SIGQUIT, &save_quit, NULL);
 122         sigaction (SIGTSTP, &save_stop, NULL);
 123
 124         return WEXITSTATUS(status);
 125 }