1 /***********************************************************************
2 *                                                                      *
3 *               This software is part of the ast package               *
4 *          Copyright (c) 1985-2011 AT&T Intellectual Property          *
5 *                      and is licensed under the                       *
6 *                 Eclipse Public License, Version 1.0                  *
7 *                    by AT&T Intellectual Property                     *
8 *                                                                      *
9 *                A copy of the License is available at                 *
10 *          http://www.eclipse.org/org/documents/epl-v10.html           *
11 *         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
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_execve
27 
28 NoN(execve)
29 
30 #else
31 
32 #include <sig.h>
33 #include <wait.h>
34 #include <error.h>
35 
36 static pid_t		childpid;
37 
38 static void
39 execsig(int sig)
40 {
41 	kill(childpid, sig);
42 	signal(sig, execsig);
43 }
44 
45 #if defined(__EXPORT__)
46 #define extern	__EXPORT__
47 #endif
48 
49 extern int
50 execve(const char* path, char* const argv[], char* const arge[])
51 {
52 	int	status;
53 
54 	if ((childpid = spawnve(path, argv, arge)) < 0)
55 		return(-1);
56 	for (status = 0; status < 64; status++)
57 		signal(status, execsig);
58 	while (waitpid(childpid, &status, 0) == -1)
59 		if (errno != EINTR) return(-1);
60 	if (WIFSIGNALED(status))
61 	{
62 		signal(WTERMSIG(status), SIG_DFL);
63 		kill(getpid(), WTERMSIG(status));
64 		pause();
65 	}
66 	else status = WEXITSTATUS(status);
67 	exit(status);
68 }
69 
70 #endif
71