99 lines
2.9 KiB
C
99 lines
2.9 KiB
C
/* $NetBSD: instr.c,v 1.12 2005/07/02 08:32:32 jmc Exp $ */
|
|
|
|
/*-
|
|
* Copyright (c) 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
#if 0
|
|
static char sccsid[] = "@(#)instr.c 8.1 (Berkeley) 5/31/93";
|
|
#else
|
|
__RCSID("$NetBSD: instr.c,v 1.12 2005/07/02 08:32:32 jmc Exp $");
|
|
#endif
|
|
#endif /* not lint */
|
|
|
|
#include <sys/types.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/stat.h>
|
|
|
|
#include <curses.h>
|
|
#include <err.h>
|
|
#include <fcntl.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <errno.h>
|
|
|
|
#include "deck.h"
|
|
#include "cribbage.h"
|
|
#include "pathnames.h"
|
|
|
|
void
|
|
instructions(void)
|
|
{
|
|
int pstat;
|
|
int fd;
|
|
pid_t pid;
|
|
const char *path;
|
|
|
|
switch (pid = vfork()) {
|
|
case -1:
|
|
err(1, "vfork");
|
|
case 0:
|
|
/* Follow the same behaviour for pagers as defined in POSIX.2
|
|
* for mailx and man. We only use a pager if stdout is
|
|
* a terminal, and we pass the file on stdin to sh -c pager.
|
|
*/
|
|
if (!isatty(1))
|
|
path = "cat";
|
|
else {
|
|
if (!(path = getenv("PAGER")) || (*path == 0))
|
|
path = _PATH_MORE;
|
|
}
|
|
if ((fd = open(_PATH_INSTR, O_RDONLY)) == -1) {
|
|
warn("open %s", _PATH_INSTR);
|
|
_exit(1);
|
|
}
|
|
if (dup2(fd, 0) == -1) {
|
|
warn("dup2");
|
|
_exit(1);
|
|
}
|
|
execl("/bin/sh", "sh", "-c", path, (char *) NULL);
|
|
warn(NULL);
|
|
_exit(1);
|
|
default:
|
|
do {
|
|
pid = waitpid(pid, &pstat, 0);
|
|
} while (pid == -1 && errno == EINTR);
|
|
if (pid == -1 || WEXITSTATUS(pstat))
|
|
exit(1);
|
|
}
|
|
}
|