#include <stdio.h>
|
#include <string.h>
|
#include <unistd.h>
|
#include <errno.h>
|
#include <sys/types.h>
|
#include <sys/wait.h>
|
|
#define MSG_STR "This message is from parent: Hello, child process!"
|
|
int main(int argc, char **argv)
|
{
|
int pipe_fd[2];
|
int rv;
|
int pid;
|
char buf[512];
|
int wstatus;
|
|
if( pipe(pipe_fd) < 0)
|
{
|
printf("Create pipe failure: %s\n", strerror(errno));
|
return -1;
|
}
|
|
if( (pid=fork()) < 0 )
|
{
|
printf("Create child process failure: %s\n", strerror(errno));
|
return -2;
|
}
|
else if(pid == 0)
|
{
|
/* child process close write endpoint, then read data from parent process */
|
close(pipe_fd[1]);
|
|
memset(buf, 0, sizeof(buf));
|
rv=read(pipe_fd[0], buf, sizeof(buf));
|
if(rv < 0 )
|
{
|
printf("Child process read from pipe failure: %s\n", strerror(errno));
|
return -3;
|
}
|
|
printf("Child process read %d bytes data from pipe: \"%s\"\n", rv, buf);
|
return 0;
|
}
|
|
/* parent process close read endpoint, then write data to child process */
|
close(pipe_fd[0]);
|
if( write(pipe_fd[1], MSG_STR, strlen(MSG_STR)) < 0)
|
{
|
printf("Parent process write data to pipe failure: %s\n", strerror(errno));
|
return -3;
|
}
|
|
|
printf("Parent start wait child process exit...\n");
|
wait(&wstatus);
|
|
return 0;
|
}
|
