如果知道一个用户的用户ID或者登录名,可以通过getpwuid或getpwnam函数获得用户的登录信息.

函数原型为:

      

#include <pwd.h>

#include <sys/types.h>

struct passwd *getpwnam(const char *name);

struct passwd *getpwuid(uid_t uid);

The passwd structure is defined in <pwd.h> as follows:

struct passwd {

char *pw_name; /* user name */

char *pw_passwd; /* user password */

uid_t pw_uid; /* user id */

gid_t pw_gid; /* group id */

char *pw_gecos; /* real name */

char *pw_dir; /* home directory */

char *pw_shell; /* shell program */

};

使用举例:

#include <pwd.h>

#include <sys/types.h>

#include <stdio.h>

int main()

{

uid_t my_uid;

my_uid = 500;

struct passwd *my_info;

my_info = getpwuid( my_uid );

//my_info = getpwnam( "fflg" );

printf( "my name = [%s]\n", my_info->pw_name );

printf( "my passwd = [%s]\n", my_info->pw_passwd );

printf( "my uid = [%d]\n", my_info->pw_uid );

printf( "my gid = [%d]\n", my_info->pw_gid );

printf( "my gecos = [%s]\n", my_info->pw_gecos );

printf( "my dir = [%s]\n", my_info->pw_dir );

printf( "my shell = [%s]\n", my_info->pw_shell );

return 0;

}