xref: /dragonfly/usr.bin/window/wwspawn.c (revision 984263bc)
1 /*
2  * Copyright (c) 1983, 1993
3  *	The Regents of the University of California.  All rights reserved.
4  *
5  * This code is derived from software contributed to Berkeley by
6  * Edward Wang at The University of California, Berkeley.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  * 1. Redistributions of source code must retain the above copyright
12  *    notice, this list of conditions and the following disclaimer.
13  * 2. Redistributions in binary form must reproduce the above copyright
14  *    notice, this list of conditions and the following disclaimer in the
15  *    documentation and/or other materials provided with the distribution.
16  * 3. All advertising materials mentioning features or use of this software
17  *    must display the following acknowledgement:
18  *	This product includes software developed by the University of
19  *	California, Berkeley and its contributors.
20  * 4. Neither the name of the University nor the names of its contributors
21  *    may be used to endorse or promote products derived from this software
22  *    without specific prior written permission.
23  *
24  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
25  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
26  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
27  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
28  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
29  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
30  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
31  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
32  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
33  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
34  * SUCH DAMAGE.
35  */
36 
37 #ifndef lint
38 static char sccsid[] = "@(#)wwspawn.c	8.1 (Berkeley) 6/6/93";
39 static char rcsid[] =
40   "$FreeBSD: src/usr.bin/window/wwspawn.c,v 1.4.2.1 2001/05/17 09:45:02 obrien Exp $";
41 #endif /* not lint */
42 
43 #include "ww.h"
44 #include <signal.h>
45 
46 /*
47  * There is a dead lock with vfork and closing of pseudo-ports.
48  * So we have to be sneaky about error reporting.
49  */
50 wwspawn(wp, file, argv)
51 register struct ww *wp;
52 char *file;
53 char **argv;
54 {
55 	int pid;
56 	int ret;
57 	char erred = 0;
58 	int s;
59 
60 	s = sigblock(sigmask(SIGCHLD));
61 	switch (pid = vfork()) {
62 	case -1:
63 		wwerrno = WWE_SYS;
64 		ret = -1;
65 		break;
66 	case 0:
67 		if (wwenviron(wp) >= 0)
68 			execvp(file, argv);
69 		erred = 1;
70 		_exit(1);
71 	default:
72 		if (erred) {
73 			wwerrno = WWE_SYS;
74 			ret = -1;
75 		} else {
76 			wp->ww_pid = pid;
77 			wp->ww_state = WWS_HASPROC;
78 			ret = pid;
79 		}
80 	}
81 	(void) sigsetmask(s);
82 	if (wp->ww_socket >= 0) {
83 		(void) close(wp->ww_socket);
84 		wp->ww_socket = -1;
85 	}
86 	return ret;
87 }
88