C语言常用代码片断

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#include <stdio.h>  //perror()
#include <stdlib.h> //exit()
#include <dirent.h> //struct dirent,DIR,opendir(),readdir()
#include <string.h> //strcmp()

void die(char * s)
{
    perror(s);
    exit(1);
}

int main()
{
    struct dirent * entry;
    DIR * dir;
    int id;

    dir = opendir("/var/run/netns");
    if (!dir)
    {
        die("opendir");
    }

    while ((entry = readdir(dir)))
    {
        if (strcmp(entry->d_name, ".") == 0)
            continue;
        if (strcmp(entry->d_name, "..") == 0)
            continue;
        printf("%s\n", entry->d_name);
    }

    closedir(dir);
    return 0;
}