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- /*-
- * Copyright (c) 1990 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. All advertising materials mentioning features or use of this software
- * must display the following acknowledgement:
- * This product includes software developed by the University of
- * California, Berkeley and its contributors.
- * 4. 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.
- */
-
- #ifndef lint
- static char sccsid[] = "@(#)instr.c 5.2 (Berkeley) 2/28/91";
- #endif /* not lint */
-
- #include <sys/types.h>
- #include <sys/wait.h>
- #include <sys/errno.h>
- #include <sys/stat.h>
- #include <unistd.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include "pathnames.h"
-
- instructions()
- {
- extern int errno;
- struct stat sb;
- union wait pstat;
- pid_t pid;
- char *pager, *path;
-
- if (stat(_PATH_INSTR, &sb)) {
- (void)fprintf(stderr, "cribbage: %s: %s.\n", _PATH_INSTR,
- strerror(errno));
- exit(1);
- }
- switch(pid = vfork()) {
- case -1:
- (void)fprintf(stderr, "cribbage: %s.\n", strerror(errno));
- exit(1);
- case 0:
- if (!(path = getenv("PAGER")))
- path = _PATH_MORE;
- if (pager = rindex(path, '/'))
- ++pager;
- pager = path;
- execlp(path, pager, _PATH_INSTR, (char *)NULL);
- (void)fprintf(stderr, "cribbage: %s.\n", strerror(errno));
- _exit(1);
- default:
- do {
- pid = waitpid(pid, (int *)&pstat, 0);
- } while (pid == -1 && errno == EINTR);
- if (pid == -1 || pstat.w_status)
- exit(1);
- }
- }
-