1 /*- 2 * Copyright (c) 1990, 1993 3 * The Regents of the University of California. All rights reserved. 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 3. Neither the name of the University nor the names of its contributors 14 * may be used to endorse or promote products derived from this software 15 * without specific prior written permission. 16 * 17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 27 * SUCH DAMAGE. 28 * 29 * @(#)instr.c 8.1 (Berkeley) 5/31/93 30 * $FreeBSD: src/games/cribbage/instr.c,v 1.5 1999/12/12 03:04:15 billf Exp $ 31 * $DragonFly: src/games/cribbage/instr.c,v 1.4 2006/09/09 02:21:49 pavalos Exp $ 32 */ 33 34 #include <sys/wait.h> 35 #include <sys/stat.h> 36 37 #include <curses.h> 38 #include <errno.h> 39 #include <stdio.h> 40 #include <stdlib.h> 41 #include <string.h> 42 #include <unistd.h> 43 44 #include "deck.h" 45 #include "cribbage.h" 46 #include "pathnames.h" 47 48 void 49 instructions(void) 50 { 51 struct stat sb; 52 union wait pstat; 53 pid_t pid; 54 const char *pager, *path; 55 56 if (stat(_PATH_INSTR, &sb)) { 57 fprintf(stderr, "cribbage: %s: %s.\n", _PATH_INSTR, 58 strerror(errno)); 59 exit(1); 60 } 61 switch (pid = vfork()) { 62 case -1: 63 fprintf(stderr, "cribbage: %s.\n", strerror(errno)); 64 exit(1); 65 case 0: 66 if (!(path = getenv("PAGER"))) 67 path = _PATH_MORE; 68 if ((pager = rindex(path, '/')) != NULL) 69 ++pager; 70 pager = path; 71 execlp(path, pager, _PATH_INSTR, NULL); 72 fprintf(stderr, "cribbage: %s.\n", strerror(errno)); 73 _exit(1); 74 default: 75 do { 76 pid = waitpid(pid, (int *)&pstat, 0); 77 } while (pid == -1 && errno == EINTR); 78 if (pid == -1 || pstat.w_status) 79 exit(1); 80 } 81 } 82