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Annotation of src/games/cribbage/instr.c, Revision 1.1

1.1     ! cgd         1: /*-
        !             2:  * Copyright (c) 1990 The Regents of the University of California.
        !             3:  * 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:
        !            34: #ifndef lint
        !            35: static char sccsid[] = "@(#)instr.c    5.2 (Berkeley) 2/28/91";
        !            36: #endif /* not lint */
        !            37:
        !            38: #include <sys/types.h>
        !            39: #include <sys/wait.h>
        !            40: #include <sys/errno.h>
        !            41: #include <sys/stat.h>
        !            42: #include <unistd.h>
        !            43: #include <stdio.h>
        !            44: #include <stdlib.h>
        !            45: #include <string.h>
        !            46: #include "pathnames.h"
        !            47:
        !            48: instructions()
        !            49: {
        !            50:        extern int errno;
        !            51:        struct stat sb;
        !            52:        union wait pstat;
        !            53:        pid_t pid;
        !            54:        char *pager, *path;
        !            55:
        !            56:        if (stat(_PATH_INSTR, &sb)) {
        !            57:                (void)fprintf(stderr, "cribbage: %s: %s.\n", _PATH_INSTR,
        !            58:                    strerror(errno));
        !            59:                exit(1);
        !            60:        }
        !            61:        switch(pid = vfork()) {
        !            62:        case -1:
        !            63:                (void)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, '/'))
        !            69:                        ++pager;
        !            70:                pager = path;
        !            71:                execlp(path, pager, _PATH_INSTR, (char *)NULL);
        !            72:                (void)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: }