/*
 * $ gcc -Wall -Wextra -std=c11 fifo.c -o fifo
 *
 * Linux:
 * $ ./fifo
 * $ echo $?
 * 0
 *
 * Cygwin:
 * $ ./fifo
 * fread: Communication error on send
 * $ echo $?
 * 1
 */

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>

int main(void) {
	const char path[] = "/tmp/fifo";
	const char sent[] = "msg";
	const size_t len = strlen(sent);
	char *const read = (char *)malloc(len);

	int r;
	size_t s;

	r = mkfifo(path, 0666);
	if (r != 0) {
		perror("mkfifo");
		return 1;
	}

	FILE* f = fopen(path, "w+");
	if (f == NULL) {
		perror("fopen");
		return 1;
	}

	s = fwrite(sent, 1, len, f);
	if (s != len) {
		perror("fwrite");
		return 1;
	}

	s = fread(read, 1, len, f);
	if (s != len) {
		perror("fread");
		return 1;
	}

	return 0;
}