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/* ==== process.c ============================================================
* Copyright (c) 1994 by Chris Provenzano, proven@mit.edu
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by Chris Provenzano.
* 4. The name of Chris Provenzano may not be used to endorse or promote
* products derived from this software without specific prior written
* permission.
*
* THIS SOFTWARE IS PROVIDED BY CHRIS PROVENZANO ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL CHRIS PROVENZANO BE LIABLE FOR ANY
* DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
* CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Description : Process functions (fork, exec, ...).
*
* 1.23 94/04/18 proven
* -Started coding this file.
*/
#include <sys/types.h>
#include <pthread.h>
#include <unistd.h>
#ifndef lint
static const char rcsid[] = "process.c,v 1.2 1995/08/06 06:19:04 hjl Exp";
#endif
/* ==========================================================================
* fork()
*
* This function requires a sig_prevent()/sig_check_and_resume() for the
* parent. The child never unlocks.
*/
pid_t fork()
{
pid_t ret;
pthread_sched_prevent();
fd_kern_fork();
if (ret = machdep_sys_fork()) { /* Parent or error */
pthread_sched_resume();
} else { /* Child */
machdep_unset_thread_timer(NULL);
machdep_stop_timer(NULL);
fork_lock++;
}
return(ret);
}
/* ==========================================================================
* execve()
*
* This function requires a sig_prevent()/sig_check_and_resume() if one
* hasn't been done in the fork routine. Normally machdep_sys_execve()
* should never return.
*/
int execve(const char *name, char * const *argv, char * const *envp)
{
int ret;
if (!fork_lock) {
pthread_sched_prevent();
fd_kern_exec(0);
ret = machdep_sys_execve(name, argv, envp);
pthread_sched_resume();
} else {
fd_kern_exec(1);
ret = machdep_sys_execve(name, argv, envp);
}
return(ret);
}
#if defined(__ELF__) || defined(__GNU_LIBRARY__)
#include <gnu-stabs.h>
#ifdef elf_alias
elf_alias (fork, __fork);
elf_alias (execve, __execve);
#endif
#endif
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