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. All advertising materials mentioning features or use of this software 14 * must display the following acknowledgement: 15 * This product includes software developed by the University of 16 * California, Berkeley and its contributors. 17 * 4. Neither the name of the University nor the names of its contributors 18 * may be used to endorse or promote products derived from this software 19 * without specific prior written permission. 20 * 21 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 24 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 31 * SUCH DAMAGE. 32 * 33 * @(#)instr.c 8.1 (Berkeley) 5/31/93 34 * $FreeBSD: src/games/cribbage/instr.c,v 1.5 1999/12/12 03:04:15 billf Exp $ 35 * $DragonFly: src/games/cribbage/instr.c,v 1.4 2006/09/09 02:21:49 pavalos Exp $ 36 */ 37 38 #include <sys/wait.h> 39 #include <sys/stat.h> 40 41 #include <errno.h> 42 #include <stdio.h> 43 #include <stdlib.h> 44 #include <string.h> 45 #include <unistd.h> 46 47 #include "cribbage.h" 48 #include "pathnames.h" 49 50 void 51 instructions(void) 52 { 53 struct stat sb; 54 union wait pstat; 55 pid_t pid; 56 const char *pager, *path; 57 58 if (stat(_PATH_INSTR, &sb)) { 59 fprintf(stderr, "cribbage: %s: %s.\n", _PATH_INSTR, 60 strerror(errno)); 61 exit(1); 62 } 63 switch (pid = vfork()) { 64 case -1: 65 fprintf(stderr, "cribbage: %s.\n", strerror(errno)); 66 exit(1); 67 case 0: 68 if (!(path = getenv("PAGER"))) 69 path = _PATH_MORE; 70 if ((pager = rindex(path, '/')) != NULL) 71 ++pager; 72 pager = path; 73 execlp(path, pager, _PATH_INSTR, (char *) NULL); 74 fprintf(stderr, "cribbage: %s.\n", strerror(errno)); 75 _exit(1); 76 default: 77 do { 78 pid = waitpid(pid, (int *)&pstat, 0); 79 } while (pid == -1 && errno == EINTR); 80 if (pid == -1 || pstat.w_status) 81 exit(1); 82 } 83 } 84