54 lines
1.3 KiB
C
54 lines
1.3 KiB
C
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//
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// Written for Computer Networks and Systems lab classes
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// AUTHOR : Sergiusz Warga
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#include <fcntl.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <sys/wait.h>
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#include <unistd.h>
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void echo(int parent_to_child, int child_to_parent) {
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while(1) {
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char buff[8000] = {0};
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int read_bytes = read(parent_to_child, &buff, sizeof(buff));
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write(child_to_parent, &buff, read_bytes);
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}
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}
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int main() {
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int parent_to_child[2], child_to_parent[2];
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if (pipe(parent_to_child) < 0 || pipe(child_to_parent) < 0 ){
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fprintf(stderr,"Something went wrong!\n");
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return -1;
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}
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int status;
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pid_t pid;
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pid = fork();
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if (pid == -1) { // If something went wrong.
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perror("Fork: ");
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exit(EXIT_FAILURE);
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}
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if (pid == 0) { // If this is a child process.
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echo(parent_to_child[0], child_to_parent[1]);
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exit(EXIT_SUCCESS);
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}
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char buff[8000];
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char messages[3][32] = {"Hello there!", "Second message.", "Bye!"};
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for (int i = 0; i < 3; ++i) {
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write(parent_to_child[1], &messages[i], sizeof(messages[i]));
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read(child_to_parent[0], buff, sizeof(buff));
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printf("%s\n", buff);
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}
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wait(&status);
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close(parent_to_child[1]);
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close(child_to_parent[0]);
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return 0;
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}
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