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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 <pthread.h>
#include <sys/types.h>
#include <pthread.h>
#include <stdarg.h>
#include <unistd.h>
#ifdef HAVE_ALLOC_H
#include <alloc.h>
#endif
extern void *alloca();
#ifndef lint
static const char rcsid[] = "$Id: process.c,v 1.1 1998/07/21 13:20:09 peter 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++;
pthread_kernel_lock--;
}
return(ret);
}
#ifdef HAVE_VFORK
/* The semantics of vfork probably won't mix well with the pthread
library code. Don't even try. */
pid_t vfork ()
{
return fork ();
}
#endif
/* ==========================================================================
* 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);
}
/* Variants of execve. Define them here so that the system versions
don't get used and drag in the system version of execve. */
#include <sys/stat.h>
#include <string.h>
#include <sys/param.h>
extern char **environ;
static const char *find (const char *name, char *buf)
{
char *p1, *p2;
extern char *getenv ();
struct stat sb;
if (strchr (name, '/'))
return name;
p1 = getenv ("PATH");
if (p1 == 0)
p1 = "/bin:/usr/bin:";
while (*p1) {
memset (buf, 0, MAXPATHLEN);
p2 = strchr (p1, ':');
if (p2 == 0)
p2 = p1 + strlen (p1);
strncpy (buf, p1, p2 - p1);
buf[p2 - p1] = 0;
strcat (buf, "/");
strcat (buf, name);
if (lstat (buf, &sb) == 0)
return buf;
if (*p2 == ':')
p2++;
p1 = p2;
}
return name;
}
int execl (const char *path, const char *arg, ...)
{
#ifdef SCO_3_5
return execve (path, (char *const *) &arg, environ);
#else
char ** argv;
va_list ap;
int i;
va_start(ap, arg);
for (i = 1; va_arg(ap, char *) != NULL; i++);
va_end(ap);
argv = alloca (i * sizeof (char *));
va_start(ap, arg);
argv[0] = (char *) arg;
for (i = 1; (argv[i] = (char *) va_arg(ap, char *)) != NULL; i++);
va_end(ap);
return execve (path, argv, environ);
#endif
}
int execlp (const char *name, const char *arg, ...)
{
#ifdef SCO_3_5
char buf[MAXPATHLEN];
return execve (find (name, buf), (char *const *) &arg, environ);
#else
char buf[MAXPATHLEN];
char ** argv;
va_list ap;
int i;
va_start(ap, arg);
for (i = 1; va_arg(ap, char *) != NULL; i++);
va_end(ap);
argv = alloca (i * sizeof (char *));
va_start(ap, arg);
argv[0] = (char *) arg;
for (i = 1; (argv[i] = (char *) va_arg(ap, char *)) != NULL; i++);
va_end(ap);
return execve (find (name, buf), argv, environ);
#endif
}
int execle (const char *name, const char *arg, ... /* , char *const envp[] */);
/* This one turns on ptrace-style tracing? */
int exect (const char *path, char *const argv[], char *const envp[]);
int execv (const char *path, char *const argv[]) {
return execve (path, argv, environ);
}
int execvp (const char *name, char *const argv[]) {
char buf[MAXPATHLEN];
return execve (find (name, buf), argv, environ);
}
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