usr/src/cmd/bnu/shio.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 1988 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 #pragma ident   "%Z%%M% %I%     %E% SMI"
  32
  33 #include "uucp.h"
  34
  35 /*
  36  * use shell to execute command with
  37  * fi, fo, and fe as standard input/output/error
  38  *      cmd     -> command to execute
  39  *      fi      -> standard input
  40  *      fo      -> standard output
  41  *      fe      -> standard error
  42  * return:
  43  *      0               -> success
  44  *      non zero        -> failure  -  status from child
  45                         (Note - -1 means the fork failed)
  46  */
  47 int
  48 shio(cmd, fi, fo, fe)
  49 char *cmd, *fi, *fo, *fe;
  50 {
  51         register pid_t pid, ret;
  52         int status;
  53
  54         if (fi == NULL)
  55                 fi = "/dev/null";
  56         if (fo == NULL)
  57                 fo = "/dev/null";
  58         if (fe == NULL)
  59                 fe = "/dev/null";
  60
  61         DEBUG(3, "shio - %s\n", cmd);
  62         if ((pid = fork()) == 0) {
  63                 (void) signal(SIGINT, SIG_IGN);
  64                 (void) signal(SIGHUP, SIG_IGN);
  65                 (void) signal(SIGQUIT, SIG_IGN);
  66                 ucloselog();
  67                 (void) close(Ifn);      /* close connection fd's */
  68                 (void) close(Ofn);
  69                 (void) close(0);        /* get stdin from file fi */
  70                 if (open(fi, 0) != 0)
  71                         exit(errno);
  72                 (void) close(1);        /* divert stdout to fo */
  73                 if (creat(fo, PUB_FILEMODE) != 1)
  74                         exit(errno);
  75                 (void) close(2);        /* divert stderr to fe */
  76                 if (creat(fe, PUB_FILEMODE) != 2)
  77                         exit(errno);
  78                 (void) execle(SHELL, "sh", "-c", cmd, (char *) 0, Env);
  79                 exit(100);
  80         }
  81
  82         /*
  83          * the status returned from wait can never be -1
  84          * see man page wait(2)
  85          * So we use the -1 value to indicate fork failed
  86          * or the wait failed.
  87          */
  88         if (pid == -1)
  89                 return(-1);
  90
  91         while ((ret = wait(&status)) != pid)
  92             if (ret == -1 && errno != EINTR)
  93                 return(-1);
  94         DEBUG(3, "status %d\n", status);
  95         return(status);
  96 }