/*
* This program creates a socket in the UNIX domain and binds a
* name to it. After printing the socket's name, a loop begins.
* Each time through the loop it accepts a connection and prints
* out messages from it. When the connection breaks, or a
* termination message comes through, the program accepts a new
* connection.
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
#define NAME "socket"
main()
{
int sock, msgsock, rval;
struct sockaddr_un server;
char buf[1024];
/* Create socket. */
sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock < 0) {
perror("opening stream socket");
exit(1);
}
/* Name socket using file system name. */
server.sun_family = AF_UNIX;
strcpy(server.sun_path, NAME);
server.sun_len = strlen(server.sun_path);
if (bind(sock, (struct sockaddr *)&server, SUN_LEN(&server))) {
perror("binding stream socket");
exit(1);
}
printf("Socket has name %s\n", server.sun_path);
/* Start accepting connections. */
listen(sock, 5);
for (;;) {
msgsock = accept(sock, 0, 0); if (msgsock == -1) perror("accept");
else do {
bzero(buf, sizeof(buf));
if ((rval = read(msgsock, buf, 1024)) < 0)
perror("reading stream message");
else if (rval == 0)
printf("Ending connection\n");
else
printf("-->%s\n", buf);
} while (rval > 0);
close(msgsock);
}
/* The following statements are not executed, because they * follow an infinite loop. However, most ordinary programs * will not run forever. In the UNIX domain it is necessary to * tell the file system that you are through using NAME. In * most programs you use the call unlink() as below. Since * the user will have to kill this program, it will be * necessary to remove the name with a shell command. */ close(sock); unlink(NAME); }