pipe system call
#include <stdio.h>
#include <unistd.h>
int main()
{
int pipeFds[2], status, pId;
char writeMsg[20] = "hello world";
char readMsg[20];
status = pipe(pipeFds);
if (status == -1)
{
printf("Unable to create pipe\n");
return 1;
}
pId = fork();
// child process
if (pId == 0)
{
read(pipeFds[0], readMsg, sizeof(readMsg));
printf("\nChild Process receives data\n%s\n", readMsg);
}
// parent process
else if (pId > 0)
{
printf("Parent Process sends data\n%s", writeMsg);
write(pipeFds[1], writeMsg, sizeof(writeMsg));
}
return 0;
}