99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/* $NetBSD: instr.c,v 1.14 2011/09/01 07:18:50 plunky Exp $ */
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/*-
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* Copyright (c) 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)instr.c 8.1 (Berkeley) 5/31/93";
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#else
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__RCSID("$NetBSD: instr.c,v 1.14 2011/09/01 07:18:50 plunky Exp $");
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#endif
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#endif /* not lint */
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#include <sys/types.h>
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#include <sys/wait.h>
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#include <sys/stat.h>
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#include <curses.h>
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#include <err.h>
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include "deck.h"
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#include "cribbage.h"
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#include "pathnames.h"
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void
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instructions(void)
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{
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int pstat;
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int fd;
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pid_t pid;
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const char *path;
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switch (pid = vfork()) {
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case -1:
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err(1, "vfork");
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case 0:
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/* Follow the same behaviour for pagers as defined in POSIX.2
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* for mailx and man. We only use a pager if stdout is
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* a terminal, and we pass the file on stdin to sh -c pager.
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*/
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if (!isatty(1))
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path = "cat";
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else {
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if (!(path = getenv("PAGER")) || (*path == 0))
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path = _PATH_MORE;
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}
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if ((fd = open(_PATH_INSTR, O_RDONLY)) == -1) {
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warn("open %s", _PATH_INSTR);
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_exit(1);
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}
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if (dup2(fd, 0) == -1) {
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warn("dup2");
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_exit(1);
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}
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execl("/bin/sh", "sh", "-c", path, (char *) NULL);
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warn(NULL);
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_exit(1);
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default:
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do {
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pid = waitpid(pid, &pstat, 0);
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} while (pid == -1 && errno == EINTR);
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if (pid == -1 || WEXITSTATUS(pstat))
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exit(1);
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}
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}
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