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1 /* $NetBSD: instr.c,v 1.9 1999/11/09 15:06:32 drochner Exp $ */
2
3 /*-
4 * Copyright (c) 1990, 1993
5 * The Regents of the University of California. All rights reserved.
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in the
14 * documentation and/or other materials provided with the distribution.
15 * 3. All advertising materials mentioning features or use of this software
16 * must display the following acknowledgement:
17 * This product includes software developed by the University of
18 * California, Berkeley and its contributors.
19 * 4. Neither the name of the University nor the names of its contributors
20 * may be used to endorse or promote products derived from this software
21 * without specific prior written permission.
22 *
23 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
24 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
25 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
26 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
27 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
28 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
29 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
31 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
32 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
33 * SUCH DAMAGE.
34 */
35
36 #include <sys/cdefs.h>
37 #ifndef lint
38 #if 0
39 static char sccsid[] = "@(#)instr.c 8.1 (Berkeley) 5/31/93";
40 #else
41 __RCSID("$NetBSD: instr.c,v 1.9 1999/11/09 15:06:32 drochner Exp $");
42 #endif
43 #endif /* not lint */
44
45 #include <sys/types.h>
46 #include <sys/wait.h>
47 #include <sys/stat.h>
48
49 #include <curses.h>
50 #include <err.h>
51 #include <fcntl.h>
52 #include <stdio.h>
53 #include <stdlib.h>
54 #include <string.h>
55 #include <unistd.h>
56 #include <errno.h>
57
58 #include "deck.h"
59 #include "cribbage.h"
60 #include "pathnames.h"
61
62 void
63 instructions()
64 {
65 int pstat;
66 int fd;
67 pid_t pid;
68 const char *path;
69
70 switch (pid = vfork()) {
71 case -1:
72 err(1, "vfork");
73 case 0:
74 /* Follow the same behaviour for pagers as defined in POSIX.2
75 * for mailx and man. We only use a pager if stdout is
76 * a terminal, and we pass the file on stdin to sh -c pager.
77 */
78 if (!isatty(1))
79 path = "cat";
80 else {
81 if (!(path = getenv("PAGER")) || (*path == 0))
82 path = _PATH_MORE;
83 }
84 if ((fd = open(_PATH_INSTR, O_RDONLY)) == -1) {
85 warn("open %s", _PATH_INSTR);
86 _exit(1);
87 }
88 if (dup2(fd, 0) == -1) {
89 warn("dup2");
90 _exit(1);
91 }
92 execl("/bin/sh", "sh", "-c", path, NULL);
93 warn(NULL);
94 _exit(1);
95 default:
96 do {
97 pid = waitpid(pid, &pstat, 0);
98 } while (pid == -1 && errno == EINTR);
99 if (pid == -1 || WEXITSTATUS(pstat))
100 exit(1);
101 }
102 }