usr/src/lib/libbc/libc/sys/common/setsid.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 1993 Sun Microsystems, Inc.  All rights reserved.
  24  * Use is subject to license terms.
  25  */
  26
  27 #pragma ident   "%Z%%M% %I%     %E% SMI"
  28
  29 #include <errno.h>
  30
  31
  32 static int setsid_called = 0;
  33 static int real_setsid_called=0;
  34 static int setsid_val, setsid_errno;
  35
  36
  37 /* setpgrp system call number, setsid command code */
  38 #define SYS_pgrpsys     39
  39 #define SYS_setsid      3
  40
  41 int
  42 setsid(void)
  43 {
  44         if (setsid_called != getpid()) {
  45                 setsid_called = getpid();
  46                 return (bc_setsid());
  47         } else {
  48                 errno = EPERM;
  49                 return (-1);
  50         }
  51 }
  52
  53
  54
  55 int
  56 bc_setsid(void)
  57 {
  58         if (real_setsid_called != getpid()) {
  59                 real_setsid_called = getpid();
  60                 setsid_val = _syscall(SYS_pgrpsys, SYS_setsid);
  61                 setsid_errno = errno;
  62         }
  63         errno = setsid_errno;
  64         return (setsid_val);
  65 }