getpwnam()

函数功能：获取用户登录相关信息

原型定义: struct passwd *getpwnam(const char *name);

表头文件:

#include <pwd.h>

#include <sys/types.h>

信息存贮在如下的结构体之中

struct passwd {

char * pw_name; /* Username. */

char * pw_passwd; /* 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. */

};

例子：

#include <stdio.h>

#include <pwd.h>

int main()

{

struct passwd * pw;

char *username = "zxl";

pw = getpwnam(username);

if (!pw) {

printf("%s is not exist\", username);

return -1;

}

printf("pw->pw_name = %s\", pw->pw_name);

printf("pw->pw_passwd = %s\", pw->pw_passwd);

printf("pw->pw_uid = %d\", pw->pw_uid);

printf("pw->pw_gid = %d\", pw->pw_gid);

printf("pw->pw_gecos = %s\", pw->pw_gecos);

printf("pw->pw_dir = %s\", pw->pw_dir);

printf("pw->pw_shell = %s\", pw->pw_shell);

}