usr/src/lib/libast/common/comp/setpgid.c

   1 /***********************************************************************
   2 *                                                                      *
   3 *               This software is part of the ast package               *
   4 *          Copyright (c) 1985-2010 AT&T Intellectual Property          *
   5 *                      and is licensed under the                       *
   6 *                  Common Public License, Version 1.0                  *
   7 *                    by AT&T Intellectual Property                     *
   8 *                                                                      *
   9 *                A copy of the License is available at                 *
  10 *            http://www.opensource.org/licenses/cpl1.0.txt             *
  11 *         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
  12 *                                                                      *
  13 *              Information and Software Systems Research               *
  14 *                            AT&T Research                             *
  15 *                           Florham Park NJ                            *
  16 *                                                                      *
  17 *                 Glenn Fowler <gsf@research.att.com>                  *
  18 *                  David Korn <dgk@research.att.com>                   *
  19 *                   Phong Vo <kpv@research.att.com>                    *
  20 *                                                                      *
  21 ***********************************************************************/
  22 #pragma prototyped
  23
  24 #include <ast.h>
  25
  26 #if _lib_setpgid
  27
  28 NoN(setpgid)
  29
  30 #else
  31
  32 #include <error.h>
  33
  34 #ifndef ENOSYS
  35 #define ENOSYS          EINVAL
  36 #endif
  37
  38 #if _lib_setpgrp2
  39 #define setpgrp         setpgrp2
  40 #else
  41 #if _lib_BSDsetpgrp
  42 #define _lib_setpgrp2   1
  43 #define setpgrp         BSDsetpgrp
  44 #else
  45 #if _lib_wait3
  46 #define _lib_setpgrp2   1
  47 #endif
  48 #endif
  49 #endif
  50
  51 #if _lib_setpgrp2
  52 extern int              setpgrp(int, int);
  53 #else
  54 extern int              setpgrp(void);
  55 #endif
  56
  57 /*
  58  * set process group id
  59  */
  60
  61 int
  62 setpgid(pid_t pid, pid_t pgid)
  63 {
  64 #if _lib_setpgrp2
  65         return(setpgrp(pid, pgid));
  66 #else
  67 #if _lib_setpgrp
  68         int     caller = getpid();
  69
  70         if ((pid == 0 || pid == caller) && (pgid == 0 || pgid == caller))
  71                 return(setpgrp());
  72         errno = EINVAL;
  73 #else
  74         errno = ENOSYS;
  75 #endif
  76         return(-1);
  77 #endif
  78 }
  79
  80 #endif