c - Message receive program only printing every other message -

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i have implemented 2 programs section 7.6 of http://beej.us/guide/bgipc/output/html/multipage/mq.html.

i have extended there 2 receiving programs , 1 goes determined message type.

the problem arises in receiving program, b , c. supposed print out messages entered program everytime, print messages every other time.

this message sent, reads first 6 chars , if urgent sets the message type.

buf.mtype = 2;  while(fgets(buf.mtext, sizeof buf.mtext, stdin) != null) {         int len = strlen(buf.mtext);          strncpy(typetest, buf.mtext, 6);          if(strncmp(typetest, "urgent", 6) == 0){             buf.mtype = 1;         }                 printf("this message %s \n", buf.mtext);          /* ditch newline @ end, if exists */         if (buf.mtext[len-1] == '\n') buf.mtext[len-1] = '\0';          if (msgsnd(msqid, &buf, len+1, 0) == -1) /* +1 '\0' */             perror("msgsnd");     }

this message received, if statement checks type print out. 

for(;;) { /* spock never quits! */         if (msgrcv(msqid, &buf, sizeof buf.mtext, 0, 0) == -1) {             perror("msgrcv");             exit(1);         }          if(buf.mtype == 2){             printf("spock: \"%s\"\n", buf.mtext);         }     }

can shed light on why prints out every other message?

thanks.

in program must set buf.mtype 2 if input not "urgent..." must in loop, every time.

while(fgets(buf.mtext, sizeof buf.mtext, stdin) != null) {     int len = strlen(buf.mtext);      strncpy(typetest, buf.mtext, 6);      if(strncmp(typetest, "urgent", 6) == 0){         buf.mtype = 1;     }            else buf.mtype= 2;    // set default      printf("this message %s \n", buf.mtext);      /* ditch newline @ end, if exists */     if (buf.mtext[len-1] == '\n') buf.mtext[len-1] = '\0';      if (msgsnd(msqid, &buf, len+1, 0) == -1) /* +1 '\0' */         perror("msgsnd"); }

in programs b , c must set msgtyp 1 or 2 each program right message queue, example:

int main(argc, argv) {     int msgtype;     if (*argv[1]=='a')         msgtype= 1;     else if (*argv[1]=='b')         msgtype= 2;     else         msgtype= 0;     ...     for(;;) { /* spock never quits! */         if (msgrcv(msqid, &buf, sizeof buf.mtext, msgtype, 0) == -1) {             perror("msgrcv");             exit(1);         }          if(buf.mtype == msgtype){             printf("spock: \"%s\"\n", buf.mtext);         }     }     return 0; }

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