/* af_unix.c: * * AF_UNIX Socket Example : */#include <stdio.h>#include <unistd.h>#include <stdlib.h>#include <errno.h>#include <string.h>#include <sys/types.h>#include <sys/stat.h>#include <sys/socket.h>#include <sys/un.h>/* * This function reports the error and * exits back to the shell : */static voidbail(const char *on_what) {    perror(on_what);    exit(1);}intmain(int argc,char **argv,char **envp) {    int z;           /* Status return code */    int sck_unix;                /* Socket */    struct sockaddr_un adr_unix;/* AF_UNIX */    int len_unix;                /* length */    const char pth_unix[]      /* pathname */        = "/tmp/my_sock";    /*     * Create a AF_UNIX (aka AF_LOCAL) socket:     */    sck_unix = socket(AF_UNIX,SOCK_STREAM,0);    if ( sck_unix == -1 )        bail("socket()");    /*     * Here we remove the pathname for the     * socket, in case it existed from a     * prior run.. ignore errors (it might     * not exist).     */    unlink(pth_unix);    /*     * Form an AF_UNIX Address :     */    memset(&adr_unix,0,sizeof adr_unix);    adr_unix.sun_family = AF_UNIX;    strncpy(adr_unix.sun_path,pth_unix,        sizeof adr_unix.sun_path-1)        [sizeof adr_unix.sun_path-1] = 0;    len_unix = SUN_LEN(&adr_unix);    /*     * Now bind the address to the socket :     */    z = bind(sck_unix,        (struct sockaddr *)&adr_unix,        len_unix);    if ( z == -1 )        bail("bind()");    /*     * Display all of our bound sockets :     */    system("netstat -pa --unix 2>/dev/null| "        "sed -n '/^Active UNIX/,/^Proto/p;"        "/af_unix/p'");    /*     * Close and unlink our socket path :     */    close(sck_unix);    unlink(pth_unix);    return 0;}