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Annotation of 43BSDTahoe/ucb/leave.c, revision 1.1

1.1     ! root        1: /*
        !             2:  * Copyright (c) 1980, 1988 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 the above copyright notice and this paragraph are
        !             7:  * duplicated in all such forms and that any documentation,
        !             8:  * advertising materials, and other materials related to such
        !             9:  * distribution and use acknowledge that the software was developed
        !            10:  * by the University of California, Berkeley.  The name of the
        !            11:  * University may not be used to endorse or promote products derived
        !            12:  * from this software without specific prior written permission.
        !            13:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
        !            14:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
        !            15:  * WARRANTIES OF MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
        !            16:  */
        !            17: 
        !            18: #ifndef lint
        !            19: char copyright[] =
        !            20: "@(#) Copyright (c) 1980, 1988 Regents of the University of California.\n\
        !            21:  All rights reserved.\n";
        !            22: #endif /* not lint */
        !            23: 
        !            24: #ifndef lint
        !            25: static char sccsid[] = "@(#)leave.c    5.4 (Berkeley) 7/7/88";
        !            26: #endif /* not lint */
        !            27: 
        !            28: #include <sys/param.h>
        !            29: #include <sys/time.h>
        !            30: #include <stdio.h>
        !            31: #include <ctype.h>
        !            32: 
        !            33: /*
        !            34:  * leave [[+]hhmm]
        !            35:  *
        !            36:  * Reminds you when you have to leave.
        !            37:  * Leave prompts for input and goes away if you hit return.
        !            38:  * It nags you like a mother hen.
        !            39:  */
        !            40: main(argc, argv)
        !            41:        int argc;
        !            42:        char **argv;
        !            43: {
        !            44:        register u_int secs;
        !            45:        register int hours, minutes;
        !            46:        register char c, *cp;
        !            47:        struct tm *t, *localtime();
        !            48:        time_t now, time();
        !            49:        int plusnow;
        !            50:        char buf[50];
        !            51: 
        !            52:        if (argc < 2) {
        !            53: #define        MSG1    "When do you have to leave? "
        !            54:                (void)write(1, MSG1, sizeof(MSG1) - 1);
        !            55:                cp = fgets(buf, sizeof(buf), stdin);
        !            56:                if (*cp == '\n')
        !            57:                        exit(0);
        !            58:        } else
        !            59:                cp = argv[1];
        !            60: 
        !            61:        if (*cp == '+') {
        !            62:                plusnow = 1;
        !            63:                ++cp;
        !            64:        } else {
        !            65:                plusnow = 0;
        !            66:                (void)time(&now);
        !            67:                t = localtime(&now);
        !            68:        }
        !            69: 
        !            70:        for (hours = 0; (c = *cp) && c != '\n'; ++cp) {
        !            71:                if (!isdigit(c))
        !            72:                        usage();
        !            73:                hours = hours * 10 + (c - '0');
        !            74:        }
        !            75:        minutes = hours % 100;
        !            76:        hours /= 100;
        !            77: 
        !            78:        if (minutes < 0 || minutes > 59)
        !            79:                usage();
        !            80:        if (plusnow)
        !            81:                secs = hours * 60 * 60 + minutes * 60;
        !            82:        else {
        !            83:                if (hours > 23 || t->tm_hour > hours ||
        !            84:                    t->tm_hour == hours && minutes <= t->tm_min)
        !            85:                        usage();
        !            86:                secs = (hours - t->tm_hour) * 60 * 60;
        !            87:                secs += (minutes - t->tm_min) * 60;
        !            88:        }
        !            89:        doalarm(secs);
        !            90:        exit(0);
        !            91: }
        !            92: 
        !            93: static
        !            94: doalarm(secs)
        !            95:        u_int secs;
        !            96: {
        !            97:        register int bother;
        !            98:        time_t daytime, time();
        !            99:        int pid;
        !           100:        char *ctime();
        !           101: 
        !           102:        if (pid = fork()) {
        !           103:                (void)time(&daytime);
        !           104:                daytime += secs;
        !           105:                printf("Alarm set for %.16s. (pid %d)\n",
        !           106:                    ctime(&daytime), pid);
        !           107:                exit(0);
        !           108:        }
        !           109:        sleep((u_int)2);                /* let parent print set message */
        !           110: 
        !           111:        /*
        !           112:         * if write fails, we've lost the terminal through someone else
        !           113:         * causing a vhangup by logging in.
        !           114:         */
        !           115: #define        FIVEMIN (5 * 60)
        !           116: #define        MSG2    "\07\07You have to leave in 5 minutes.\n"
        !           117:        if (secs >= FIVEMIN) {
        !           118:                sleep(secs - FIVEMIN);
        !           119:                if (write(1, MSG2, sizeof(MSG2) - 1) != sizeof(MSG2) - 1)
        !           120:                        exit(0);
        !           121:                secs = FIVEMIN;
        !           122:        }
        !           123: 
        !           124: #define        ONEMIN  (60)
        !           125: #define        MSG3    "\07\07Just one more minute!\n"
        !           126:        if (secs >= ONEMIN) {
        !           127:                sleep(secs - ONEMIN);
        !           128:                if (write(1, MSG3, sizeof(MSG3) - 1) != sizeof(MSG3) - 1)
        !           129:                        exit(0);
        !           130:        }
        !           131: 
        !           132: #define        MSG4    "\07\07Time to leave!\n"
        !           133:        for (bother = 10; bother--;) {
        !           134:                sleep((u_int)ONEMIN);
        !           135:                if (write(1, MSG4, sizeof(MSG4) - 1) != sizeof(MSG4) - 1)
        !           136:                        exit(0);
        !           137:        }
        !           138: 
        !           139: #define        MSG5    "\07\07That was the last time I'll tell you.  Bye.\n"
        !           140:        (void)write(1, MSG5, sizeof(MSG5) - 1);
        !           141:        exit(0);
        !           142: }
        !           143: 
        !           144: static
        !           145: usage()
        !           146: {
        !           147:        fprintf(stderr, "usage: leave [[+]hhmm]\n");
        !           148:        exit(1);
        !           149: }

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