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#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#define SOCKET_PATHNAME "/root/unixsock"
#define BUFSIZE 200
void consumer()
{
struct sockaddr_un peer_addr;
int len;
int size;
char buf[BUFSIZE];
/* Attach to server socket */
int sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock < 0) {
printf("consumer: error opening socket\n");
exit(1);
}
printf("consumer connecting to producer\n");
peer_addr.sun_family = AF_UNIX;
strcpy(peer_addr.sun_path, SOCKET_PATHNAME);
len = strlen(SOCKET_PATHNAME) + sizeof(peer_addr.sun_family);
if (connect(sock, (struct sockaddr*)&peer_addr, len) < 0) {
printf("consumer: error in connect\n");
exit(1);
}
printf("consumer connected to producer\n");
size = recv(sock, &buf[0], BUFSIZE, 0);
if (size < 0) {
printf("consumer: error in recv\n");
exit(1);
}
printf("consumer received message: %s\n", &buf[0]);
}
void producer()
{
struct sockaddr_un my_addr;
struct sockaddr_un peer_addr;
int status;
int connsock;
int len;
socklen_t peeraddrlen;
char *msg = "this is a message from producer to consumer";
/* Create server socket, UNIX domain */
int sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock < 0) {
printf("producer: error opening socket\n");
exit(1);
}
/* Await connections */
my_addr.sun_family = AF_UNIX;
strcpy(my_addr.sun_path, SOCKET_PATHNAME);
len = strlen(SOCKET_PATHNAME) + sizeof(my_addr.sun_family);
unlink(SOCKET_PATHNAME);
status = bind(sock, (struct sockaddr*)&my_addr, len);
if (status < 0) {
printf("producer failed to bind\n");
exit(1);
}
if (listen(sock, 5) < 0) {
printf("producer failed to listen\n");
exit(1);
}
connsock = accept(sock, (struct sockaddr*)&peer_addr, &peeraddrlen);
if (connsock < 0) {
printf("producer failed to accept\n");
exit(1);
}
/* Send out message on socket */
status = send(connsock, &msg[0], strlen(msg)+1, 0);
if (status < 0) {
printf("producer failed to send\n");
exit(1);
}
}
int main()
{
if (fork() == 0) {
/* start the producer/server first */
producer();
exit(0);
}
/* parent process proceeds here */
sleep(1);
consumer();
exit(0);
}
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