C语言setpwent()函数：从头读取密码文件中的账号数据

相关函数：getpwent, endpwent

头文件：#include <pwd.h>   #include <sys/types.h>

定义函数：void setpwent(void);

函数说明：setpwent()用来将getpwent()的读写地址指回密码文件开头。

范例
#include <pwd.h>
#include <sys/types.h>
main()
{
    struct passwd *user;
    int i;
    for(i = 0; i < 4; i++)
    {
        user = getpwent();
        printf("%s :%d :%d :%s:%s:%s\n", user->pw_name, user->pw_uid, user->pw_gid,
        user->pw_gecos, user->pw_dir, user->pw_shell);
    }

    setpwent();
    user = getpwent();
    printf("%s :%d :%d :%s:%s:%s\n", user->pw_name, user->pw_uid, user->pw_gid,
    user->pw_gecos, user->pw_dir, user->pw_shell);
    endpwent();
}

执行结果：
root:0:0:root:/root:/bin/bash
bin:1:1:bin:/bin
daemon:2:2:daemon:/sbin
adm:3:4:adm:/var/adm
root:0:0:root:/root:/bin/bash