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Annotation of 43BSDReno/games/cribbage/instr.c, revision 1.1

1.1     ! root        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 are permitted
        !             6:  * provided that: (1) source distributions retain this entire copyright
        !             7:  * notice and comment, and (2) distributions including binaries display
        !             8:  * the following acknowledgement:  ``This product includes software
        !             9:  * developed by the University of California, Berkeley and its contributors''
        !            10:  * in the documentation or other materials provided with the distribution
        !            11:  * and in all advertising materials mentioning features or use of this
        !            12:  * software. Neither the name of the University nor the names of its
        !            13:  * contributors may be used to endorse or promote products derived
        !            14:  * from this software without specific prior written permission.
        !            15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            18:  */
        !            19: 
        !            20: #ifndef lint
        !            21: static char sccsid[] = "@(#)instr.c    5.1 (Berkeley) 6/1/90";
        !            22: #endif /* not lint */
        !            23: 
        !            24: #include <sys/types.h>
        !            25: #include <sys/wait.h>
        !            26: #include <sys/errno.h>
        !            27: #include <sys/stat.h>
        !            28: #include <sys/file.h>
        !            29: #include <stdio.h>
        !            30: #include "pathnames.h"
        !            31: 
        !            32: instructions()
        !            33: {
        !            34:        extern int errno;
        !            35:        struct stat sb;
        !            36:        union wait pstat;
        !            37:        pid_t pid, waitpid();
        !            38:        char *pager, *path, *getenv(), *rindex(), *strerror();
        !            39: 
        !            40:        if (stat(_PATH_INSTR, &sb)) {
        !            41:                (void)fprintf(stderr, "cribbage: %s: %s.\n", _PATH_INSTR,
        !            42:                    strerror(errno));
        !            43:                exit(1);
        !            44:        }
        !            45:        switch(pid = vfork()) {
        !            46:        case -1:
        !            47:                (void)fprintf(stderr, "cribbage: %s.\n", strerror(errno));
        !            48:                exit(1);
        !            49:        case 0:
        !            50:                if (!(path = getenv("PAGER")))
        !            51:                        path = _PATH_MORE;
        !            52:                if (pager = rindex(path, '/'))
        !            53:                        ++pager;
        !            54:                pager = path;
        !            55:                execlp(path, pager, _PATH_INSTR, (char *)NULL);
        !            56:                (void)fprintf(stderr, "cribbage: %s.\n", strerror(errno));
        !            57:                _exit(1);
        !            58:        default:
        !            59:                do {
        !            60:                        pid = waitpid(pid, &pstat, 0);
        !            61:                } while (pid == -1 && errno == EINTR);
        !            62:                if (pid == -1 || pstat.w_status)
        !            63:                        exit(1);
        !            64:        }
        !            65: }

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