1/***********************************************************************
2*                                                                      *
3*               This software is part of the ast package               *
4*          Copyright (c) 1985-2010 AT&T Intellectual Property          *
5*                      and is licensed under the                       *
6*                  Common Public License, Version 1.0                  *
7*                    by AT&T Intellectual Property                     *
8*                                                                      *
9*                A copy of the License is available at                 *
10*            http://www.opensource.org/licenses/cpl1.0.txt             *
11*         (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9)         *
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
28NoN(execve)
29
30#else
31
32#include <sig.h>
33#include <wait.h>
34#include <error.h>
35
36static pid_t		childpid;
37
38static void
39execsig(int sig)
40{
41	kill(childpid, sig);
42	signal(sig, execsig);
43}
44
45#if defined(__EXPORT__)
46#define extern	__EXPORT__
47#endif
48
49extern int
50execve(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