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use std::ptr;
use std::c_str::{CString, ToCStr};
use libc::{c_char};
use syscall::{syscall, SysPivotRoot};
use {SysResult, SysError};
mod ffi {
use libc::{c_char, c_int};
extern {
// change working directory
// doc: http://man7.org/linux/man-pages/man2/chdir.2.html
pub fn chdir(path: *const c_char) -> c_int;
// execute program
// doc: http://man7.org/linux/man-pages/man2/execve.2.html
pub fn execve(filename: *const c_char, argv: *const *const c_char, envp: *const *const c_char) -> c_int;
}
}
pub fn chdir<S: ToCStr>(path: S) -> SysResult<()> {
let path = path.to_c_str();
let res = unsafe { ffi::chdir(path.as_ptr()) };
if res != 0 {
return Err(SysError::last());
}
return Ok(())
}
pub fn execve<S: ToCStr, S1: ToCStr, I1: Iterator<S1>, S2: ToCStr, I2: Iterator<S2>>(
filename: S, args: I1, env: I2) -> SysResult<()> {
let args: Vec<CString> = args.map(|s| s.to_c_str()).collect();
let env: Vec<CString> = env.map(|s| s.to_c_str()).collect();
let mut args_p: Vec<*const c_char> = args.iter().map(|s| s.as_ptr()).collect();
args_p.push(ptr::null());
let mut env_p: Vec<*const c_char> = env.iter().map(|s| s.as_ptr()).collect();
env_p.push(ptr::null());
let res = unsafe {
ffi::execve(filename.to_c_str().as_ptr(), args_p.as_ptr(), env_p.as_ptr())
};
if res != 0 {
return Err(SysError::last());
}
// Should never reach here
Ok(())
}
pub fn pivot_root<S1: ToCStr, S2: ToCStr>(new_root: S1, put_old: S2) -> SysResult<()> {
let new_root = new_root.to_c_str();
let put_old = put_old.to_c_str();
let res = unsafe {
syscall(SysPivotRoot, new_root.as_ptr(), put_old.as_ptr())
};
if res == 0 {
return Err(SysError::last());
}
Ok(())
}
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