C Named pipe (fifo). Parent process gets stuck
- by Blitzkr1eg
I want to make a simple program, that fork, and the child writes into the named pipe and the parent reads and displays from the named pipe.
The problem is that it enters the parent, does the first printf and then it gets weird, it doesn't do anything else, does not get to the second printf, it just ways for input in the console.
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
void main()
{
char t[100];
mkfifo("myfifo",777);
pid_t pid;
pid = fork();
if (pid==0)
{
//execl("fifo2","fifo2",(char*)0);
char r[100];
printf("scrie2->");
scanf("%s",r);
int fp;
fp = open("myfifo",O_WRONLY);
write(fp,r,99);
close(fp);
printf("exit kid \n");
exit(0);
} else
{
wait(0);
printf("entered parent \n"); // <- this it prints
// whats below this line apparently its not being executed
int fz; printf("1");
fz = open("myfifo",O_RDONLY); printf("2");
printf("fd: %d",fz);
char p[100];
int size;
printf("------");
//struct stat *info;
//stat("myfifo",info); printf("%d",(*info).st_size);
read(fz,p,99);
close(fz);
printf("%s",p);
printf("exit"); exit(0);
}
}
