FIFO files and read/write

I've been trying to get some insight on FIFO and this low level I/O before my laboratories on monday and I came to this situation I don't quite understand. The program should: Server: - creates FIFOs, - sends 5 messages: "Message #i", with interval of 5 sec, - deletes FIFOs, Client: - reads from FIFO and displays the message, - terminates if there was no msg for 6 seconds, And it does communicate however, client is displaying not exactly what I did send him, and more importantly, seems to be reading from the beginning every time a new msg arrives. I've been trying to figure out, for quite a while, and it just doesn't seem to match what the documentation said... Please help! :( server ``` #include <stdio.h> #include <stdlib.h> #include <fcntl.h> #include <string.h> #include <sys/stat.h> #include <unistd.h> int main(int argc, char* argv[]) { int s2c, c2s, i; char fifo_name1[] = "/tmp/fifo1"; char fifo_name2[] = "/tmp/fifo2"; char msg[80], buf[10]; struct stat st; // if no fifos, create 'em if (stat(fifo_name1, &st) != 0) mkfifo(fifo_name1, 0666); if (stat(fifo_name2, &st) != 0) mkfifo(fifo_name2, 0666); s2c= open(fifo_name1, O_WRONLY); c2s= open(fifo_name2, O_RDONLY); // start sending messages, with 5s interval for (i=0; i<5; i++) { printf("Message #%d \n", i); strcat(msg, "Message #"); strcat(msg, itoa(i, buf, 10)); strcat(msg, "\0"); write(s2c, msg, strlen(msg)+1); sleep(5); } // delete fifos unlink(fifo_name1); unlink(fifo_name2); printf("server exit successfully"); return EXIT_SUCCESS; } ``` client ``` #include <stdio.h> #include <fcntl.h> #include <stdlib.h> #include <unistd.h> int main(int argc, char* argv[]) { int c2s, s2c, c=0; char buf[10]; char fifo_name1[] = "/tmp/fifo1"; char fifo_name2[] = "/tmp/fifo2"; s2c= open(fifo_name1, O_RDONLY); c2s= open(fifo_name2, O_WRONLY); // receive messages while (1) { if (read(s2c, &buf, sizeof(char)*10) > 0) { printf("%s \n", buf); c=0; } sleep(1); c++; if (c>6) break; } printf("client exit successfully"); return EXIT_SUCCESS; } ```