exa/unix.rs

56 lines
1.3 KiB
Rust
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use std::str::raw::from_c_str;
use std::ptr::read;
mod c {
#![allow(non_camel_case_types)]
extern crate libc;
use self::libc::{
c_char,
c_int,
uid_t,
time_t
};
pub struct c_passwd {
pub pw_name: *c_char, // login name
pub pw_passwd: *c_char,
pub pw_uid: c_int, // user ID
pub pw_gid: c_int, // group ID
pub pw_change: time_t,
pub pw_class: *c_char,
pub pw_gecos: *c_char, // full name
pub pw_dir: *c_char, // login dir
pub pw_shell: *c_char, // login shell
pub pw_expire: time_t // password expiry time
}
pub struct c_group {
pub gr_name: *c_char // group name
}
extern {
pub fn getpwuid(uid: c_int) -> *c_passwd;
pub fn getgrgid(gid: uid_t) -> *c_group;
}
}
pub fn get_user_name(uid: i32) -> Option<~str> {
let pw = unsafe { c::getpwuid(uid) };
if pw.is_not_null() {
return unsafe { Some(from_c_str(read(pw).pw_name)) };
}
else {
return None;
}
}
pub fn get_group_name(gid: u32) -> Option<~str> {
let gr = unsafe { c::getgrgid(gid) };
if gr.is_not_null() {
return unsafe { Some(from_c_str(read(gr).gr_name)) };
}
else {
return None;
}
}