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setpgid.c

/***********************************************************************
*                                                                      *
*               This software is part of the ast package               *
*          Copyright (c) 1985-2009 AT&T Intellectual Property          *
*                      and is licensed under the                       *
*                  Common Public License, Version 1.0                  *
*                    by AT&T Intellectual Property                     *
*                                                                      *
*                A copy of the License is available at                 *
*            http://www.opensource.org/licenses/cpl1.0.txt             *
*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
*                                                                      *
*              Information and Software Systems Research               *
*                            AT&T Research                             *
*                           Florham Park NJ                            *
*                                                                      *
*                 Glenn Fowler <gsf@research.att.com>                  *
*                  David Korn <dgk@research.att.com>                   *
*                   Phong Vo <kpv@research.att.com>                    *
*                                                                      *
***********************************************************************/
#pragma prototyped

#include <ast.h>

#if _lib_setpgid

NoN(setpgid)

#else

#include <error.h>

#ifndef ENOSYS
#define ENOSYS          EINVAL
#endif

#if _lib_setpgrp2
#define setpgrp         setpgrp2
#else
#if _lib_BSDsetpgrp
#define _lib_setpgrp2   1
#define setpgrp         BSDsetpgrp
#else
#if _lib_wait3
#define     _lib_setpgrp2     1
#endif
#endif
#endif

#if _lib_setpgrp2
extern int        setpgrp(int, int);
#else
extern int        setpgrp(void);
#endif

/*
 * set process group id
 */

int
setpgid(pid_t pid, pid_t pgid)
{
#if _lib_setpgrp2
      return(setpgrp(pid, pgid));
#else
#if _lib_setpgrp
      int   caller = getpid();

      if ((pid == 0 || pid == caller) && (pgid == 0 || pgid == caller))
            return(setpgrp());
      errno = EINVAL;
#else
      errno = ENOSYS;
#endif
      return(-1);
#endif
}

#endif

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