apue 16.2

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

int main()
{
    int sock_fd;

    if(sock_fd = socket(AF_INET, SOCK_STREAM, 0) < 0)
    {
        perror(NULL);
        exit(1);
    }

    struct stat sock_stat;

    if(fstat(sock_fd, &sock_stat) < 0)
    {
        perror("fstat");
        exit(2);
    }
    printf("the socket fd is %d\n", sock_fd);

    printf("fstat:    sock_stat.st_dev %d\n    sock_stat.st_ino %ld\n    sock_stat.st_dev %d\n    sock_stat.st_mode %d\n    sock_stat.st_nlink %d\n",
            (int)sock_stat.st_dev, sock_stat.st_ino, sock_stat.st_mode, sock_stat.st_mode, sock_stat.st_nlink);
    printf("    sock_stat.st_uid %d\n    sock_stat.st_gid %d\n    sock_stat.st_rdev %d\n    sock_stat.st_size %ld\n    sock_stat.st_blksize %ld\n",
            sock_stat.st_uid, sock_stat.st_gid, (int)sock_stat.st_rdev, sock_stat.st_size, sock_stat.st_blksize);
    printf("    sock_stat.st_blocks %d\n    sock_stat.st_atime %ld\n    sock_stat.st_ctime %ld\n    sock_stat.st_mtime %ld\n    ",
            (int)sock_stat.st_blocks, sock_stat.st_atime, sock_stat.st_ctime, sock_stat.st_mtime);

    return 0;


}

在ubuntu 12.4里结果是每一个都有