usr/src/lib/libmail/common/systemvp.c

   1 /*
   2  * CDDL HEADER START
   3  *
   4  * The contents of this file are subject to the terms of the
   5  * Common Development and Distribution License (the "License").
   6  * You may not use this file except in compliance with the License.
   7  *
   8  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
   9  * or http://www.opensolaris.org/os/licensing.
  10  * See the License for the specific language governing permissions
  11  * and limitations under the License.
  12  *
  13  * When distributing Covered Code, include this CDDL HEADER in each
  14  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  15  * If applicable, add the following below this CDDL HEADER, with the
  16  * fields enclosed by brackets "[]" replaced with your own identifying
  17  * information: Portions Copyright [yyyy] [name of copyright owner]
  18  *
  19  * CDDL HEADER END
  20  */
  21
  22 /*
  23  * Copyright 2008 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 /*
  31  *  These routines are based on the standard UNIX stdio popen/pclose
  32  *  routines. This version takes an argv[][] argument instead of a string
  33  *  to be passed to the shell. The routine execvp() is used to call the
  34  *  program, hence the name popenvp() and the argument types.
  35  *
  36  *  This routine avoids an extra shell completely, along with not having
  37  *  to worry about quoting conventions in strings that have spaces,
  38  *  quotes, etc.
  39  */
  40
  41 #pragma ident   "%Z%%M% %I%     %E% SMI"
  42
  43 #include <sys/types.h>
  44 #include "libmail.h"
  45 #include <signal.h>
  46 #include <unistd.h>
  47 #include <wait.h>
  48
  49 pid_t
  50 systemvp(char *file, char **argv, int resetid)
  51 {
  52         int     status;
  53         pid_t   pid, w;
  54         void (*istat)(int), (*qstat)(int);
  55
  56         if ((pid = fork()) == 0) {
  57                 if (resetid) {
  58                         (void) setgid(getgid());
  59                         (void) setuid(getuid());
  60                 }
  61                 (void) execvp(file, argv);
  62                 _exit(127);
  63         }
  64         istat = signal(SIGINT, SIG_IGN);
  65         qstat = signal(SIGQUIT, SIG_IGN);
  66         do {
  67                 w = wait(&status);
  68         } while (w != pid && w != (pid_t)-1);
  69         (void) signal(SIGINT, istat);
  70         (void) signal(SIGQUIT, qstat);
  71         return ((w == (pid_t)-1)? w: (pid_t)status);
  72 }