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Annotation of 43BSDReno/games/cribbage/instr.c, revision 1.1.1.1

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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