给一个Unix域套接字bind一个路径名

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

#define     SA      struct sockaddr

int main(int argc, char **argv)
{
    int                    sockfd;
    socklen_t            len;
    struct sockaddr_un    addr1, addr2;

    if (argc != 2)
        err_quit("usage: unixbind <pathname>");

    sockfd = socket(AF_LOCAL, SOCK_STREAM, 0);

    unlink(argv[1]);        /* OK if this fails */

    bzero(&addr1, sizeof(addr1));
    addr1.sun_family = AF_LOCAL;
    strncpy(addr1.sun_path, argv[1], sizeof(addr1.sun_path)-1);
    bind(sockfd, (SA *) &addr1, SUN_LEN(&addr1));

    len = sizeof(addr2);
    getsockname(sockfd, (SA *) &addr2, &len);
    printf("bound name = %s, returned len = %d
", addr2.sun_path, len);
    
    exit(0);
}