usr/src/lib/libbc/libc/gen/sys5/system.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, Version 1.0 only
   6  * (the "License").  You may not use this file except in compliance
   7  * with the License.
   8  *
   9  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
  10  * or http://www.opensolaris.org/os/licensing.
  11  * See the License for the specific language governing permissions
  12  * and limitations under the License.
  13  *
  14  * When distributing Covered Code, include this CDDL HEADER in each
  15  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
  16  * If applicable, add the following below this CDDL HEADER, with the
  17  * fields enclosed by brackets "[]" replaced with your own identifying
  18  * information: Portions Copyright [yyyy] [name of copyright owner]
  19  *
  20  * CDDL HEADER END
  21  */
  22 /*
  23  * Copyright 1992 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 /*      Copyright (c) 1984 AT&T */
  28 /*        All Rights Reserved   */
  29
  30 #pragma ident   "%Z%%M% %I%     %E% SMI"  /* from S5R2 1.2 */
  31
  32 /*LINTLIBRARY*/
  33 #include <signal.h>
  34 #include <sys/types.h>
  35 #include <sys/wait.h>
  36 #include <string.h>
  37 #include <sys/file.h>
  38
  39 extern int execl();
  40
  41 int
  42 system(s)
  43 char    *s;
  44 {
  45         int     status;
  46         pid_t   pid, w;
  47         register void (*istat)(), (*qstat)();
  48         char    path[256];
  49         char    *c;
  50
  51         while (*s == ' ' || *s == '\t')
  52                 s++;
  53
  54         if (strncmp(s, "/usr/ucb", strlen("/usr/ucb")) == 0) {
  55                 /* check if command is under /usr/ucb, if not
  56                  * replace /usr/ucb with /usr/bin.
  57                  */
  58                 strcpy(path, s);
  59                 if ((c = strchr(path, ' ')) != NULL)
  60                         *c ='\0';
  61                 if (access(path, F_OK) == -1) {
  62                         strncpy(path, "/usr/bin", strlen("/usr/bin"));
  63                         if (c != NULL) *c = ' ';
  64                         s = path;
  65                 }
  66         }
  67         else if (strncmp(s, "/bin", strlen("/bin")) == 0 ||
  68                  strncmp(s, "/usr/bin", strlen("/usr/bin")) == 0) {
  69                 /* if /usr/bin is specified, first check if the command
  70                  * exists under /usr/bin, otherwise try /usr/ucb */
  71                 if (access(path, F_OK) == -1) {
  72                         strcpy(path, "/usr/ucb");
  73                         if (strncmp(s, "/bin", strlen("/bin")) == 0)
  74                                 strcat(path, strchr(s+1, '/'));
  75                         else {
  76                                 c = strchr(s+1, '/');
  77                                 strcat(path, strchr(c+1, '/'));
  78                         }
  79                         if (c != NULL) *c = ' ';
  80                         s = path;
  81                 }
  82         }
  83
  84         if ((pid = vfork()) == 0) {
  85                 (void) execl("/bin/sh", "sh", "-c", s, (char *)0);
  86                 _exit(127);
  87         }
  88         if (pid == -1) {
  89                 return (-1);
  90         }
  91         istat = signal(SIGINT, SIG_IGN);
  92         qstat = signal(SIGQUIT, SIG_IGN);
  93         w = waitpid(pid, &status, 0);
  94         (void) signal(SIGINT, istat);
  95         (void) signal(SIGQUIT, qstat);
  96         return ((w == -1) ? -1: status);
  97 }