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use libc::{pid_t, c_int};
use errno::Errno;
use {Error, Result};
use sys::signal;
mod ffi {
use libc::{pid_t, c_int};
extern {
pub fn waitpid(pid: pid_t, status: *mut c_int, options: c_int) -> pid_t;
}
}
#[cfg(not(any(target_os = "linux",
target_os = "android")))]
bitflags!(
flags WaitPidFlag: c_int {
const WNOHANG = 0x00000001,
}
);
#[cfg(any(target_os = "linux",
target_os = "android"))]
bitflags!(
flags WaitPidFlag: c_int {
const WNOHANG = 0x00000001,
const WUNTRACED = 0x00000002,
const WEXITED = 0x00000004,
const WCONTINUED = 0x00000008,
const WNOWAIT = 0x01000000, // Don't reap, just poll status.
const __WNOTHREAD = 0x20000000, // Don't wait on children of other threads in this group
const __WALL = 0x40000000, // Wait on all children, regardless of type
// const __WCLONE = 0x80000000,
}
);
#[cfg(any(target_os = "linux",
target_os = "android"))]
const WSTOPPED: WaitPidFlag = WUNTRACED;
#[derive(Eq, PartialEq, Clone, Copy, Debug)]
pub enum WaitStatus {
Exited(pid_t, i8),
Signaled(pid_t, signal::SigNum, bool),
Stopped(pid_t, signal::SigNum),
Continued(pid_t),
StillAlive
}
#[cfg(any(target_os = "linux",
target_os = "android"))]
mod status {
use sys::signal;
pub fn exited(status: i32) -> bool {
(status & 0x7F) == 0
}
pub fn exit_status(status: i32) -> i8 {
((status & 0xFF00) >> 8) as i8
}
pub fn signaled(status: i32) -> bool {
((((status & 0x7f) + 1) as i8) >> 1) > 0
}
pub fn term_signal(status: i32) -> signal::SigNum {
(status & 0x7f) as signal::SigNum
}
pub fn dumped_core(status: i32) -> bool {
(status & 0x80) != 0
}
pub fn stopped(status: i32) -> bool {
(status & 0xff) == 0x7f
}
pub fn stop_signal(status: i32) -> signal::SigNum {
((status & 0xFF00) >> 8) as signal::SigNum
}
pub fn continued(status: i32) -> bool {
status == 0xFFFF
}
}
#[cfg(any(target_os = "macos",
target_os = "ios"))]
mod status {
use sys::signal;
const WCOREFLAG: i32 = 0x80;
const WSTOPPED: i32 = 0x7f;
fn wstatus(status: i32) -> i32 {
status & 0x7F
}
pub fn exit_status(status: i32) -> i8 {
((status >> 8) & 0xFF) as i8
}
pub fn stop_signal(status: i32) -> signal::SigNum {
(status >> 8) as signal::SigNum
}
pub fn continued(status: i32) -> bool {
wstatus(status) == WSTOPPED && stop_signal(status) == 0x13
}
pub fn stopped(status: i32) -> bool {
wstatus(status) == WSTOPPED && stop_signal(status) != 0x13
}
pub fn exited(status: i32) -> bool {
wstatus(status) == 0
}
pub fn signaled(status: i32) -> bool {
wstatus(status) != WSTOPPED && wstatus(status) != 0
}
pub fn term_signal(status: i32) -> signal::SigNum {
wstatus(status) as signal::SigNum
}
pub fn dumped_core(status: i32) -> bool {
(status & WCOREFLAG) != 0
}
}
#[cfg(any(target_os = "freebsd",
target_os = "openbsd",
target_os = "dragonfly",
target_os = "netbsd"))]
mod status {
use sys::signal;
const WCOREFLAG: i32 = 0x80;
const WSTOPPED: i32 = 0x7f;
fn wstatus(status: i32) -> i32 {
status & 0x7F
}
pub fn stopped(status: i32) -> bool {
wstatus(status) == WSTOPPED
}
pub fn stop_signal(status: i32) -> signal::SigNum {
(status >> 8) as signal::SigNum
}
pub fn signaled(status: i32) -> bool {
wstatus(status) != WSTOPPED && wstatus(status) != 0 && status != 0x13
}
pub fn term_signal(status: i32) -> signal::SigNum {
wstatus(status) as signal::SigNum
}
pub fn exited(status: i32) -> bool {
wstatus(status) == 0
}
pub fn exit_status(status: i32) -> i8 {
(status >> 8) as i8
}
pub fn continued(status: i32) -> bool {
status == 0x13
}
pub fn dumped_core(status: i32) -> bool {
(status & WCOREFLAG) != 0
}
}
fn decode(pid : pid_t, status: i32) -> WaitStatus {
if status::exited(status) {
WaitStatus::Exited(pid, status::exit_status(status))
} else if status::signaled(status) {
WaitStatus::Signaled(pid, status::term_signal(status), status::dumped_core(status))
} else if status::stopped(status) {
WaitStatus::Stopped(pid, status::stop_signal(status))
} else {
assert!(status::continued(status));
WaitStatus::Continued(pid)
}
}
pub fn waitpid(pid: pid_t, options: Option<WaitPidFlag>) -> Result<WaitStatus> {
use self::WaitStatus::*;
let mut status: i32 = 0;
let option_bits = match options {
Some(bits) => bits.bits(),
None => 0
};
let res = unsafe { ffi::waitpid(pid as pid_t, &mut status as *mut c_int, option_bits) };
if res < 0 {
Err(Error::Sys(Errno::last()))
} else if res == 0 {
Ok(StillAlive)
} else {
Ok(decode(res, status))
}
}
pub fn wait() -> Result<WaitStatus> {
waitpid(-1, None)
}
|
