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Annotation of cci/usr/src/ucb/talk/announce.c, revision 1.1

1.1     ! root        1: /* $Header: announce.c,v 1.2 85/01/09 13:04:28 rcs Exp $ */
        !             2: 
        !             3: #include "ctl.h"
        !             4: 
        !             5: #include <sys/stat.h>
        !             6: #include <sgtty.h>
        !             7: #include <sys/ioctl.h>
        !             8: #include <sys/time.h>
        !             9: #include <sys/signal.h>
        !            10: #include <stdio.h>
        !            11: #include <sys/wait.h>
        !            12: #include <errno.h>
        !            13: 
        !            14: char *sprintf();
        !            15: 
        !            16: extern int errno;
        !            17: extern char hostname[];
        !            18: extern int debug;
        !            19: int trapit();
        !            20: int nofork = 0;                /* to be set from the debugger */
        !            21: 
        !            22: /*
        !            23:  * Changes
        !            24:  *     .  fix fprintf() in print_msg() to include a format statement.
        !            25:  *
        !            26:  *     .  fix announce() and announce_proc() to output weird cases
        !            27:  *        to console.
        !            28:  */
        !            29: /*
        !            30:  * Because the tty driver insists on attaching a terminal-less
        !            31:  * process to any terminal that it writes on, we must fork a child
        !            32:  * to protect ourselves
        !            33:  */
        !            34: 
        !            35: announce(request, remote_machine)
        !            36: CTL_MSG *request;
        !            37: char *remote_machine;
        !            38: {
        !            39:     int pid, val, status;
        !            40:     int i;
        !            41: 
        !            42:     if (debug)
        !            43:            setbuf(stdout, (char *)0);
        !            44: 
        !            45:     if (nofork) {
        !            46:        int   stat;
        !            47:        stat = (announce_proc(request, remote_machine));
        !            48:     }
        !            49: 
        !            50:     if ( pid = fork() ) {
        !            51: 
        !            52:            /* we are the parent, so wait for the child */
        !            53: 
        !            54:        if (pid == -1) {
        !            55:                /* the fork failed */
        !            56:            return(FAILED);
        !            57:        }
        !            58: 
        !            59:        do {
        !            60:            val = wait(&status);
        !            61:            if (val == -1) {
        !            62:                if (errno == EINTR) {
        !            63:                    continue;
        !            64:                } else {
        !            65:                        /* shouldn't happen */
        !            66:                    print_error("wait");
        !            67:                    return(FAILED);
        !            68:                }
        !            69:            }
        !            70:        } while (val != pid);
        !            71: 
        !            72:        if (status&0377 > 0) {
        !            73:            char buf[200];
        !            74:            /* we were killed by some signal */
        !            75:            sprintf(buf,"child killed by signal %d",status&0377);
        !            76:            print_error(buf);
        !            77:            return(FAILED);
        !            78:        }
        !            79: 
        !            80:            /* Get the second byte, this is the exit/return code */
        !            81: 
        !            82:        return((status>>8)&0377);
        !            83: 
        !            84:     } else {
        !            85:        int stat;
        !            86: 
        !            87:        /* we are the child, go and do it */
        !            88:        stat = announce_proc(request, remote_machine);
        !            89:        _exit(stat);
        !            90:     }
        !            91: }
        !            92:        
        !            93: 
        !            94:     /* See if the user is accepting messages. If so, announce that 
        !            95:        a talk is requested.
        !            96:      */
        !            97: 
        !            98: announce_proc(request, remote_machine)
        !            99: CTL_MSG *request;
        !           100: char *remote_machine;
        !           101: {
        !           102:     int pid, status;
        !           103:     char full_tty[32];
        !           104:     FILE *tf;
        !           105:     struct stat stbuf;
        !           106: 
        !           107: 
        !           108:     if (debug)
        !           109:            setbuf(stdout, (char *)0);
        !           110: 
        !           111:     (void) sprintf(full_tty, "/dev/%s", request->ctlm_r_tty);
        !           112: 
        !           113:     if (access(full_tty, 0) != 0) {
        !           114:        char    buf[200];
        !           115:        sprintf(buf,"cannot access /dev/%s",request->ctlm_r_tty);
        !           116:        print_error(buf);
        !           117:        return(FAILED);
        !           118:     }
        !           119: 
        !           120:     if ((tf = fopen(full_tty, "w")) == NULL) {
        !           121:        return(PERMISSION_DENIED);
        !           122:     }
        !           123: 
        !           124:        /* open gratuitously attaches the talkd to
        !           125:           any tty it opens, so disconnect us from the
        !           126:           tty before we catch a signal */
        !           127: 
        !           128:     ioctl(fileno(tf), TIOCNOTTY, (struct sgttyb *) 0);
        !           129: 
        !           130:     if (fstat(fileno(tf), &stbuf) < 0) {
        !           131:        return(PERMISSION_DENIED);
        !           132:     }
        !           133: 
        !           134:     if ((stbuf.st_mode&02) == 0) {
        !           135:        return(PERMISSION_DENIED);
        !           136:     }
        !           137: 
        !           138:     print_mesg(tf, request, remote_machine);
        !           139:     fclose(tf);
        !           140:     return(SUCCESS);
        !           141: }
        !           142: 
        !           143: #define max(a,b) ( (a) > (b) ? (a) : (b) )
        !           144: #define N_LINES 5
        !           145: #define N_CHARS 120
        !           146: 
        !           147:     /*
        !           148:      * build a block of characters containing the message. 
        !           149:      * It is sent blank filled and in a single block to
        !           150:      * try to keep the message in one piece if the recipient
        !           151:      * in in vi at the time
        !           152:      */
        !           153: 
        !           154: print_mesg(tf, request, remote_machine)
        !           155: FILE *tf;
        !           156: CTL_MSG *request;
        !           157: char *remote_machine;
        !           158: {
        !           159:     struct timeval clock;
        !           160:     struct timezone zone;
        !           161:     struct tm *localtime();
        !           162:     struct tm *localclock;
        !           163:     char line_buf[N_LINES][N_CHARS];
        !           164:     int sizes[N_LINES];
        !           165:     char big_buf[N_LINES*N_CHARS];
        !           166:     char *bptr, *lptr;
        !           167:     int i, j, max_size;
        !           168: 
        !           169:     i = 0;
        !           170:     max_size = 0;
        !           171: 
        !           172:     gettimeofday(&clock, &zone);
        !           173:     localclock = localtime( &clock.tv_sec );
        !           174: 
        !           175:     sprintf(line_buf[i], " ");
        !           176: 
        !           177:     sizes[i] = strlen(line_buf[i]);
        !           178:     max_size = max(max_size, sizes[i]);
        !           179:     i++;
        !           180: 
        !           181:     sprintf(line_buf[i], "Message from Talk_Daemon@%s at %d:%02d ...",
        !           182:        hostname, localclock->tm_hour , localclock->tm_min );
        !           183: 
        !           184:     sizes[i] = strlen(line_buf[i]);
        !           185:     max_size = max(max_size, sizes[i]);
        !           186:     i++;
        !           187: 
        !           188:     sprintf(line_buf[i], "talk: connection requested by %s@%s.",
        !           189:                request->ctlm_l_name, remote_machine);
        !           190: 
        !           191:     sizes[i] = strlen(line_buf[i]);
        !           192:     max_size = max(max_size, sizes[i]);
        !           193:     i++;
        !           194: 
        !           195:     sprintf(line_buf[i], "talk: respond with:  talk %s@%s",
        !           196:                request->ctlm_l_name, remote_machine);
        !           197: 
        !           198:     sizes[i] = strlen(line_buf[i]);
        !           199:     max_size = max(max_size, sizes[i]);
        !           200:     i++;
        !           201: 
        !           202:     sprintf(line_buf[i], " ");
        !           203: 
        !           204:     sizes[i] = strlen(line_buf[i]);
        !           205:     max_size = max(max_size, sizes[i]);
        !           206:     i++;
        !           207: 
        !           208:     bptr = big_buf;
        !           209:     *(bptr++) = '';   /* send something to wake them up */
        !           210:     *(bptr++) = '\r';  /* add a \r in case of raw mode */
        !           211:     *(bptr++) = '\n';
        !           212:     for(i = 0; i < N_LINES; i++) {
        !           213: 
        !           214:            /* copy the line into the big buffer */
        !           215: 
        !           216:        lptr = line_buf[i];
        !           217:        while (*lptr != '\0') {
        !           218:            *(bptr++) = *(lptr++);
        !           219:        }
        !           220: 
        !           221:            /* pad out the rest of the lines with blanks */
        !           222: 
        !           223:        for(j = sizes[i]; j < max_size + 2; j++) {
        !           224:            *(bptr++) = ' ';
        !           225:        }
        !           226: 
        !           227:        *(bptr++) = '\r';       /* add a \r in case of raw mode */
        !           228:        *(bptr++) = '\n';
        !           229:     }
        !           230:     *bptr = '\0';
        !           231: 
        !           232:     fprintf(tf, "%s", big_buf);
        !           233:     fflush(tf);
        !           234:     ioctl(fileno(tf), TIOCNOTTY, (struct sgttyb *) 0);
        !           235: }

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