stdio to unix socket

server.c

#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>

#define SOCK_PATH "echo_socket"
#define nop() asm volatile("nop")

int main(void){
	int s, s2, t, len;
	struct sockaddr_un local, remote;
	pid_t child_pid;
	char str[100];

	if ((s = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
		perror("socket");
		exit(1);
	}

	local.sun_family = AF_UNIX;
	strcpy(local.sun_path, SOCK_PATH);
	unlink(local.sun_path);
	len = strlen(local.sun_path) + sizeof(local.sun_family);
	if (bind(s, (struct sockaddr *)&local, len) == -1) {
		perror("bind");
		exit(1);
	}

	if (listen(s, 5) == -1) {
		perror("listen");
		exit(1);
	}

	for(;;) {
		int status, n;
		printf("Waiting for a connection...\n");
		t = sizeof(remote);
		if ((s2 = accept(s, (struct sockaddr *)&remote, &t)) == -1) {
			perror("accept");
			exit(1);
		}
		printf("Connected\n");
		child_pid = fork();
		if(child_pid < 0){
			perror("fork failed");
			exit(1);
		} else if(child_pid == 0){
			if(handle(s2) < 0){
				perror("something failed in child process");
				_exit(1);
			}
			_exit(0);
		} else {
			while(wait(&status) != child_pid) nop();
			close(s2);
		}
	}
	return 0;
}

int handle(int s){
	/* Close stdio */
	close(0);
	close(1);
	close(2);
	if(dup(s) != 0 || dup(s) != 1 || dup(s) != 2 ) {
		return -1;
	}
	char *argv[] = {"/bin/bash", "/home/mark/coding/stdio-to-unix-socket/test.sh", 0};
	char *env[] = {"PATH=/bin:/usr/bin", 0};
	if (execve(*argv, argv, env) < 0) {
		return -1;
	}
}