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Annotation of 41BSD/cmd/wall.c, revision 1.1

1.1     ! root        1: static char *sccsid = "@(#)wall.c      4.1 (Berkeley) 10/1/80";
        !             2: /*
        !             3:  * wall.c - Broadcast a message to all users.
        !             4:  *
        !             5:  * This program is not related to David Wall, whose Stanford Ph.D. thesis
        !             6:  * is entitled "Mechanisms for Broadcast and Selective Broadcast".
        !             7:  */
        !             8: 
        !             9: #include <stdio.h>
        !            10: #include <utmp.h>
        !            11: #include <time.h>
        !            12: #define        USERS   128
        !            13: 
        !            14: char   mesg[3000];
        !            15: int    msize,sline;
        !            16: struct utmp utmp[USERS];
        !            17: char   *strcpy();
        !            18: char   *strcat();
        !            19: char who[9] = "???";
        !            20: long   clock;
        !            21: struct tm *localtime();
        !            22: struct tm *localclock;
        !            23: 
        !            24: main(argc, argv)
        !            25: char *argv[];
        !            26: {
        !            27:        register i;
        !            28:        register char c;
        !            29:        register struct utmp *p;
        !            30:        FILE *f;
        !            31: 
        !            32:        if((f = fopen("/etc/utmp", "r")) == NULL) {
        !            33:                fprintf(stderr, "Cannot open /etc/utmp\n");
        !            34:                exit(1);
        !            35:        }
        !            36:        clock = time( 0 );
        !            37:        localclock = localtime( &clock );
        !            38:        fread((char *)utmp, sizeof(struct utmp), USERS, f);
        !            39:        fclose(f);
        !            40:        f = stdin;
        !            41:        if(argc >= 2) {
        !            42:                /* take message from unix file instead of standard input */
        !            43:                if((f = fopen(argv[1], "r")) == NULL) {
        !            44:                        fprintf(stderr,"Cannot open %s\n", argv[1]);
        !            45:                        exit(1);
        !            46:                }
        !            47:        }
        !            48:        while((i = getc(f)) != EOF) mesg[msize++] = i;
        !            49:        fclose(f);
        !            50:        sline = ttyslot(2); /* 'utmp' slot no. of sender */
        !            51:        if (sline) {
        !            52:                for (i=0;(c=utmp[sline].ut_name[i]) && i<sizeof(utmp[0].ut_name);i++)
        !            53:                        who[i]=c;
        !            54:                who[i] = '\0'; /* sender initials */
        !            55:                }
        !            56:        for(i=0; i<USERS; i++) {
        !            57:                p = &utmp[i];
        !            58:                if(p->ut_name[0] == 0)
        !            59:                        continue;
        !            60:                sleep(1);
        !            61:                sendmes(p->ut_line);
        !            62:        }
        !            63:        exit(0);
        !            64: }
        !            65: 
        !            66: sendmes(tty)
        !            67: char *tty;
        !            68: {
        !            69:        register i;
        !            70:        char t[50], buf[BUFSIZ];
        !            71:        register char *cp;
        !            72:        register int c, ch;
        !            73:        FILE *f;
        !            74: 
        !            75:        i = fork();
        !            76:        if(i == -1) {
        !            77:                fprintf(stderr, "Try again\n");
        !            78:                return;
        !            79:        }
        !            80:        if(i)
        !            81:                return;
        !            82:        strcpy(t, "/dev/");
        !            83:        strcat(t, tty);
        !            84: 
        !            85:        if((f = fopen(t, "w")) == NULL) {
        !            86:                fprintf(stderr,"cannot open %s\n", t);
        !            87:                exit(1);
        !            88:        }
        !            89:        setbuf(f, buf);
        !            90:        fprintf(f, "\nBroadcast Message from %s (%s) at %d:%02d ...\r\n\n"
        !            91:               ,who, utmp[sline].ut_line
        !            92:               , localclock -> tm_hour , localclock -> tm_min );
        !            93:        /* fwrite(mesg, msize, 1, f); */
        !            94:        for (cp = mesg, c = msize; c-- > 0; cp++) {
        !            95:                ch = *cp;
        !            96:                if (ch == '\n')
        !            97:                        putc('\r', f);
        !            98:                putc(ch, f);
        !            99:        }
        !           100: 
        !           101:        /*
        !           102:         * Bitchin'.
        !           103:         */
        !           104: 
        !           105:        exit(0);
        !           106: }

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