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Annotation of src/games/cribbage/instr.c, Revision 1.12

1.12    ! jmc         1: /*     $NetBSD: instr.c,v 1.11 2005/02/15 12:56:20 jsm Exp $   */
1.3       cgd         2:
1.1       cgd         3: /*-
1.3       cgd         4:  * Copyright (c) 1990, 1993
                      5:  *     The Regents of the University of California.  All rights reserved.
1.1       cgd         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.
1.10      agc        15:  * 3. Neither the name of the University nor the names of its contributors
1.1       cgd        16:  *    may be used to endorse or promote products derived from this software
                     17:  *    without specific prior written permission.
                     18:  *
                     19:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     20:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     21:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     22:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     23:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     24:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     25:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     26:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     27:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     28:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     29:  * SUCH DAMAGE.
                     30:  */
                     31:
1.6       lukem      32: #include <sys/cdefs.h>
1.1       cgd        33: #ifndef lint
1.3       cgd        34: #if 0
                     35: static char sccsid[] = "@(#)instr.c    8.1 (Berkeley) 5/31/93";
                     36: #else
1.12    ! jmc        37: __RCSID("$NetBSD: instr.c,v 1.11 2005/02/15 12:56:20 jsm Exp $");
1.3       cgd        38: #endif
1.1       cgd        39: #endif /* not lint */
                     40:
                     41: #include <sys/types.h>
                     42: #include <sys/wait.h>
                     43: #include <sys/stat.h>
1.3       cgd        44:
                     45: #include <curses.h>
1.7       lukem      46: #include <err.h>
1.8       jsm        47: #include <fcntl.h>
1.1       cgd        48: #include <stdio.h>
                     49: #include <stdlib.h>
                     50: #include <string.h>
1.3       cgd        51: #include <unistd.h>
1.4       jtc        52: #include <errno.h>
1.3       cgd        53:
                     54: #include "deck.h"
                     55: #include "cribbage.h"
1.1       cgd        56: #include "pathnames.h"
                     57:
1.3       cgd        58: void
1.12    ! jmc        59: instructions(void)
1.1       cgd        60: {
1.8       jsm        61:        int pstat;
                     62:        int fd;
1.1       cgd        63:        pid_t pid;
1.8       jsm        64:        const char *path;
1.1       cgd        65:
1.3       cgd        66:        switch (pid = vfork()) {
1.1       cgd        67:        case -1:
1.7       lukem      68:                err(1, "vfork");
1.1       cgd        69:        case 0:
1.8       jsm        70:                /* Follow the same behaviour for pagers as defined in POSIX.2
                     71:                 * for mailx and man.  We only use a pager if stdout is
                     72:                 * a terminal, and we pass the file on stdin to sh -c pager.
                     73:                 */
                     74:                if (!isatty(1))
                     75:                        path = "cat";
                     76:                else {
                     77:                        if (!(path = getenv("PAGER")) || (*path == 0))
                     78:                                path = _PATH_MORE;
                     79:                }
                     80:                if ((fd = open(_PATH_INSTR, O_RDONLY)) == -1) {
                     81:                        warn("open %s", _PATH_INSTR);
                     82:                        _exit(1);
                     83:                }
                     84:                if (dup2(fd, 0) == -1) {
                     85:                        warn("dup2");
                     86:                        _exit(1);
                     87:                }
1.11      jsm        88:                execl("/bin/sh", "sh", "-c", path, (char *) NULL);
1.9       drochner   89:                warn(NULL);
1.1       cgd        90:                _exit(1);
                     91:        default:
                     92:                do {
1.8       jsm        93:                        pid = waitpid(pid, &pstat, 0);
1.1       cgd        94:                } while (pid == -1 && errno == EINTR);
1.8       jsm        95:                if (pid == -1 || WEXITSTATUS(pstat))
1.1       cgd        96:                        exit(1);
                     97:        }
                     98: }