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发信人: althea (稻草人), 信区: Linux
标  题: [part 2] epserver.c
发信站: BBS 水木清华站 (Fri Dec 29 23:46:59 2000)

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

#define MAX_NAME_LENGTH         64
#define DISPLAY_LENGTH          64

char socket_file_name[MAX_NAME_LENGTH];

int make_named_socket (const char *filename)
{
    struct sockaddr_un name;
    int sock;
    size_t size;

    /* Create the socket. */
    sock = socket (PF_LOCAL, SOCK_DGRAM, 0);
    if (sock < 0)
    {
        perror ("socket");
        exit (EXIT_FAILURE);
    }

    /* Bind a name to the socket. */
    name.sun_family = AF_LOCAL;
    strncpy (name.sun_path, filename, sizeof (name.sun_path));

    size = SUN_LEN (&name);

    if (bind (sock, (struct sockaddr *) &name, size) < 0)
    {
        perror ("bind");
        exit (EXIT_FAILURE);
    }

    return sock;
}

void delete_socket (int sig)
{
    signal (sig, SIG_DFL);
    unlink (socket_file_name);
    kill (getpid (), sig);
}

void handle_signals ()
{
    signal (SIGHUP, delete_socket);
    signal (SIGINT, delete_socket);
    signal (SIGQUIT, delete_socket);
    signal (SIGILL, delete_socket);
    signal (SIGTRAP, delete_socket);
    signal (SIGABRT, delete_socket);
    signal (SIGFPE, delete_socket);
    signal (SIGSEGV, delete_socket);
    signal (SIGTERM, delete_socket);
}

int main ()
{
    int status, socket, nbytes;
    char display_name[DISPLAY_LENGTH];

    snprintf (socket_file_name, MAX_NAME_LENGTH, "/tmp/ep-%d", (int) geteuid());
    handle_signals ();
    socket = make_named_socket(socket_file_name);

    while (1) {
        if ((nbytes = read (socket, display_name, DISPLAY_LENGTH)) < 0) {
            if (nbytes == EINTR) continue;
            perror ("read");
            exit (EXIT_FAILURE);
        }

        write (STDOUT_FILENO, display_name, nbytes);
    }

    return 0;
}

--
Look Ma, this man can twist his fingers as if they were made of rubber,
isn't that amazing? -- Not really, he's been using emacs for years...!

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