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/* Setpgid.c - Emulate setpgid for systems that don't have it.
Copyright (C) 1996 Malc Arnold.
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2, or (at your option)
any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */
#include <stdio.h>
#include <errno.h>
#include <sys/types.h>
/****************************************************************************/
/* RCS info */
#ifndef lint
static char *RcsId = "$Id: setpgid.c,v 2.0 1997/09/06 11:56:40 malc Rel $";
#endif /* ! lint */
/****************************************************************************/
/*LINTLIBRARY*/
/****************************************************************************/
/* Global function declarations */
extern int getpid(), setpgrp(), getpgrp();
/****************************************************************************/
/* Import the system error number */
extern int errno;
/****************************************************************************/
int setpgid(pid, pgid)
int pid, pgid;
{
/* Emulate setpgid by using setpgrp */
#ifdef PGRP_FUNCS_NEED_ARGS
/* This is a straightforward substitution */
return(setpgrp(pid, pgid));
#else /* ! PGRP_FUNCS_NEED_ARGS */
/* In this case, there are things this library can't do */
if (pid != 0 && pid != getpid() || pgid != 0 && pgid != pid) {
/* This is valid, but we can't emulate it */
errno = EINVAL;
return(-1);
}
return(setpgrp());
#endif /* ! PGRP_FUNCS_NEED_ARGS */
}
/****************************************************************************/
int getpgid(pid)
int pid;
{
/* Emulate setpgid by using setpgrp */
#ifdef PGRP_FUNCS_NEED_ARGS
/* This is a straightforward substitution */
return(getpgrp(pid));
#else /* ! PGRP_FUNCS_NEED_ARGS */
/* In this case, there are things this library can't do */
if (pid != 0 && pid != getpid()) {
/* This is valid, but we can't emulate it */
errno = EINVAL;
return(-1);
}
return(getpgrp());
#endif /* ! PGRP_FUNCS_NEED_ARGS */
}
/****************************************************************************/
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