56 lines
1.2 KiB
C
56 lines
1.2 KiB
C
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#include <stdlib.h>
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#include <stdio.h>
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#include <unistd.h>
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#include <sys/wait.h>
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#include <errno.h>
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#include <string.h>
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#define PREAD 0 // index of read end of pipe
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#define PWRITE 1 // index of write end of pipe
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#define BUFSIZE 1024
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int main(int argc, char *argv[]) {
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int par_child_pipe[2];
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int pipe_result = pipe(par_child_pipe);
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if(pipe_result != 0) {
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perror("Failed to create pipe");
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exit(1);
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}
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pid_t child_pid = fork();
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if(child_pid <0){
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perror("Failed to fork");
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exit(1);
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}
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// CHILD CODE
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if(child_pid == 0){
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char *msg = "Send $$$ please!";
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int msg_len = strlen(msg)+1;
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int bytes_written = write(par_child_pipe[PWRITE], msg, msg_len);
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printf("Child wrote %d bytes\n",bytes_written);
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fflush(stdout);
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close(par_child_pipe[PWRITE]);
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close(par_child_pipe[PREAD]);
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exit(0);
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}
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// PARENT CODE
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wait(NULL);
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char buffer[BUFSIZE];
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// printf("Child %d started\n",child_pid);
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int bytes_read = read(par_child_pipe[PREAD], buffer, BUFSIZE);
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close(par_child_pipe[PWRITE]);
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close(par_child_pipe[PREAD]);
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printf("Parent read %d bytes\n",bytes_read);
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printf("Child said: '%s'\n",buffer);
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// wait(NULL);
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return 0;
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}
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