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|
// Portions of this file are Copyright 2014 The Rust Project Developers.
// See http://rust-lang.org/COPYRIGHT.
use libc;
use {Errno, Result};
use std::mem;
use std::ptr;
pub use libc::{
SIGHUP,
SIGINT,
SIGQUIT,
SIGILL,
SIGABRT,
SIGFPE,
SIGKILL,
SIGSEGV,
SIGPIPE,
SIGALRM,
SIGTERM,
SIGTRAP,
SIGIOT,
SIGBUS,
SIGSYS,
SIGURG,
SIGSTOP,
SIGTSTP,
SIGCONT,
SIGCHLD,
SIGTTIN,
SIGTTOU,
SIGIO,
SIGXCPU,
SIGXFSZ,
SIGVTALRM,
SIGPROF,
SIGWINCH,
SIGUSR1,
SIGUSR2,
};
// This doesn't always exist, but when it does, it's 7
pub const SIGEMT: libc::c_int = 7;
pub const NSIG: libc::c_int = 32;
pub use self::signal::sigset_t;
bitflags!{
flags SockFlag: libc::c_int {
const SA_NOCLDSTOP = libc::SA_NOCLDSTOP,
const SA_NOCLDWAIT = libc::SA_NOCLDWAIT,
const SA_NODEFER = libc::SA_NODEFER,
const SA_ONSTACK = libc::SA_ONSTACK,
const SA_RESETHAND = libc::SA_RESETHAND,
const SA_RESTART = libc::SA_RESTART,
const SA_SIGINFO = libc::SA_SIGINFO,
}
}
bitflags!{
flags HowFlag: libc::c_int {
const SIG_BLOCK = libc::SIG_BLOCK,
const SIG_UNBLOCK = libc::SIG_UNBLOCK,
const SIG_SETMASK = libc::SIG_SETMASK,
}
}
#[cfg(any(all(target_os = "linux",
any(target_arch = "x86",
target_arch = "x86_64",
target_arch = "aarch64",
target_arch = "arm")),
target_os = "android"))]
pub mod signal {
use libc;
use super::SockFlag;
// This definition is not as accurate as it could be, {pid, uid, status} is
// actually a giant union. Currently we're only interested in these fields,
// however.
#[repr(C)]
#[derive(Clone, Copy)]
pub struct siginfo {
pub si_signo: libc::c_int,
pub si_errno: libc::c_int,
pub si_code: libc::c_int,
pub pid: libc::pid_t,
pub uid: libc::uid_t,
pub status: libc::c_int,
}
#[repr(C)]
#[allow(missing_copy_implementations)]
pub struct sigaction {
pub sa_handler: extern fn(libc::c_int),
pub sa_mask: sigset_t,
pub sa_flags: SockFlag,
sa_restorer: *mut libc::c_void,
}
#[repr(C)]
#[cfg(target_pointer_width = "32")]
#[derive(Clone, Copy)]
pub struct sigset_t {
__val: [libc::c_ulong; 32],
}
#[repr(C)]
#[cfg(target_pointer_width = "64")]
#[derive(Clone, Copy)]
pub struct sigset_t {
__val: [libc::c_ulong; 16],
}
}
#[cfg(all(target_os = "linux",
any(target_arch = "mips", target_arch = "mipsel")))]
pub mod signal {
use libc;
use super::SockFlag;
// This definition is not as accurate as it could be, {pid, uid, status} is
// actually a giant union. Currently we're only interested in these fields,
// however.
#[repr(C)]
pub struct siginfo {
pub si_signo: libc::c_int,
pub si_code: libc::c_int,
pub si_errno: libc::c_int,
pub pid: libc::pid_t,
pub uid: libc::uid_t,
pub status: libc::c_int,
}
#[repr(C)]
pub struct sigaction {
pub sa_flags: SockFlag,
pub sa_handler: extern fn(libc::c_int),
pub sa_mask: sigset_t,
sa_restorer: *mut libc::c_void,
sa_resv: [libc::c_int; 1],
}
#[repr(C)]
pub struct sigset_t {
__val: [libc::c_ulong; 32],
}
}
#[cfg(any(target_os = "macos",
target_os = "ios",
target_os = "freebsd",
target_os = "openbsd",
target_os = "dragonfly",
target_os = "netbsd"))]
pub mod signal {
use libc;
use super::SockFlag;
#[cfg(any(target_os = "macos", target_os = "ios", target_os = "openbsd"))]
pub type sigset_t = u32;
#[cfg(target_os = "freebsd")]
#[repr(C)]
#[derive(Clone, Copy)]
pub struct sigset_t {
bits: [u32; 4],
}
#[cfg(any(target_os = "dragonfly", target_os = "netbsd"))]
#[repr(C)]
#[derive(Clone, Copy)]
pub struct sigset_t {
bits: [libc::c_uint; 4],
}
// This structure has more fields, but we're not all that interested in
// them.
#[cfg(not(target_os = "dragonfly"))]
#[repr(C)]
#[derive(Clone, Copy)]
pub struct siginfo {
pub si_signo: libc::c_int,
pub si_errno: libc::c_int,
pub si_code: libc::c_int,
pub pid: libc::pid_t,
pub uid: libc::uid_t,
pub status: libc::c_int,
}
#[cfg(target_os = "dragonfly")]
#[repr(C)]
#[derive(Clone, Copy)]
pub struct siginfo {
pub si_signo: libc::c_int,
pub si_errno: libc::c_int,
pub si_code: libc::c_int,
pub pid: libc::c_int,
pub uid: libc::c_uint,
pub status: libc::c_int,
}
#[cfg(any(target_os = "macos", target_os = "ios"))]
#[repr(C)]
#[allow(missing_copy_implementations)]
pub struct sigaction {
pub sa_handler: extern fn(libc::c_int),
pub sa_mask: sigset_t,
pub sa_flags: SockFlag,
}
#[cfg(any(target_os = "freebsd", target_os = "dragonfly"))]
#[repr(C)]
pub struct sigaction {
pub sa_handler: extern fn(libc::c_int),
pub sa_flags: SockFlag,
pub sa_mask: sigset_t,
}
#[cfg(any(target_os = "openbsd", target_os = "netbsd"))]
#[repr(C)]
pub struct sigaction {
pub sa_handler: extern fn(libc::c_int),
pub sa_mask: sigset_t,
pub sa_flags: SockFlag,
}
}
mod ffi {
use libc::{c_int, pid_t};
use super::signal::{sigaction, sigset_t};
#[allow(improper_ctypes)]
extern {
pub fn sigaction(signum: c_int,
act: *const sigaction,
oldact: *mut sigaction) -> c_int;
pub fn sigaddset(set: *mut sigset_t, signum: c_int) -> c_int;
pub fn sigdelset(set: *mut sigset_t, signum: c_int) -> c_int;
pub fn sigemptyset(set: *mut sigset_t) -> c_int;
pub fn sigfillset(set: *mut sigset_t) -> c_int;
pub fn sigismember(set: *const sigset_t, signum: c_int) -> c_int;
pub fn pthread_sigmask(how: c_int, set: *const sigset_t, oldset: *mut sigset_t) -> c_int;
pub fn kill(pid: pid_t, signum: c_int) -> c_int;
pub fn raise(signum: c_int) -> c_int;
pub fn sigwait(set: *const sigset_t, sig: *mut c_int) -> c_int;
}
}
#[derive(Clone, Copy)]
pub struct SigSet {
sigset: sigset_t
}
pub type SigNum = libc::c_int;
impl SigSet {
pub fn all() -> SigSet {
let mut sigset: sigset_t = unsafe { mem::uninitialized() };
let _ = unsafe { ffi::sigfillset(&mut sigset as *mut sigset_t) };
SigSet { sigset: sigset }
}
pub fn empty() -> SigSet {
let mut sigset: sigset_t = unsafe { mem::uninitialized() };
let _ = unsafe { ffi::sigemptyset(&mut sigset as *mut sigset_t) };
SigSet { sigset: sigset }
}
pub fn add(&mut self, signum: SigNum) -> Result<()> {
let res = unsafe { ffi::sigaddset(&mut self.sigset as *mut sigset_t, signum) };
Errno::result(res).map(drop)
}
pub fn remove(&mut self, signum: SigNum) -> Result<()> {
let res = unsafe { ffi::sigdelset(&mut self.sigset as *mut sigset_t, signum) };
Errno::result(res).map(drop)
}
pub fn contains(&self, signum: SigNum) -> Result<bool> {
let res = unsafe { ffi::sigismember(&self.sigset as *const sigset_t, signum) };
match try!(Errno::result(res)) {
1 => Ok(true),
0 => Ok(false),
_ => unreachable!("unexpected value from sigismember"),
}
}
/// Gets the currently blocked (masked) set of signals for the calling thread.
pub fn thread_get_mask() -> Result<SigSet> {
let mut oldmask: SigSet = unsafe { mem::uninitialized() };
try!(pthread_sigmask(HowFlag::empty(), None, Some(&mut oldmask)));
Ok(oldmask)
}
/// Sets the set of signals as the signal mask for the calling thread.
pub fn thread_set_mask(&self) -> Result<()> {
pthread_sigmask(SIG_SETMASK, Some(self), None)
}
/// Adds the set of signals to the signal mask for the calling thread.
pub fn thread_block(&self) -> Result<()> {
pthread_sigmask(SIG_BLOCK, Some(self), None)
}
/// Removes the set of signals from the signal mask for the calling thread.
pub fn thread_unblock(&self) -> Result<()> {
pthread_sigmask(SIG_UNBLOCK, Some(self), None)
}
/// Sets the set of signals as the signal mask, and returns the old mask.
pub fn thread_swap_mask(&self, how: HowFlag) -> Result<SigSet> {
let mut oldmask: SigSet = unsafe { mem::uninitialized() };
try!(pthread_sigmask(how, Some(self), Some(&mut oldmask)));
Ok(oldmask)
}
/// Suspends execution of the calling thread until one of the signals in the
/// signal mask becomes pending, and returns the accepted signal.
pub fn wait(&self) -> Result<SigNum> {
let mut signum: SigNum = unsafe { mem::uninitialized() };
let res = unsafe { ffi::sigwait(&self.sigset as *const sigset_t, &mut signum) };
Errno::result(res).map(|_| signum)
}
}
impl AsRef<sigset_t> for SigSet {
fn as_ref(&self) -> &sigset_t {
&self.sigset
}
}
pub use self::signal::siginfo;
#[allow(unknown_lints)]
#[allow(raw_pointer_derive)]
#[derive(Clone, Copy)]
pub enum SigHandler {
SigDfl,
SigIgn,
Handler(extern fn(SigNum)),
SigAction(extern fn(SigNum, *mut siginfo, *mut libc::c_void))
}
type sigaction_t = self::signal::sigaction;
pub struct SigAction {
sigaction: sigaction_t
}
impl SigAction {
/// This function will set or unset the flag `SA_SIGINFO` depending on the
/// type of the `handler` argument.
pub fn new(handler: SigHandler, flags: SockFlag, mask: SigSet) -> SigAction {
let mut s = unsafe { mem::uninitialized::<sigaction_t>() };
s.sa_handler = match handler {
SigHandler::SigDfl => unsafe { mem::transmute(libc::SIG_DFL) },
SigHandler::SigIgn => unsafe { mem::transmute(libc::SIG_IGN) },
SigHandler::Handler(f) => f,
SigHandler::SigAction(f) => unsafe { mem::transmute(f) },
};
s.sa_flags = match handler {
SigHandler::SigAction(_) => flags | SA_SIGINFO,
_ => flags - SA_SIGINFO,
};
s.sa_mask = mask.sigset;
SigAction { sigaction: s }
}
}
pub unsafe fn sigaction(signum: SigNum, sigaction: &SigAction) -> Result<SigAction> {
let mut oldact = mem::uninitialized::<sigaction_t>();
let res =
ffi::sigaction(signum, &sigaction.sigaction as *const sigaction_t, &mut oldact as *mut sigaction_t);
Errno::result(res).map(|_| SigAction { sigaction: oldact })
}
/// Manages the signal mask (set of blocked signals) for the calling thread.
///
/// If the `set` parameter is `Some(..)`, then the signal mask will be updated with the signal set.
/// The `how` flag decides the type of update. If `set` is `None`, `how` will be ignored,
/// and no modification will take place.
///
/// If the 'oldset' parameter is `Some(..)` then the current signal mask will be written into it.
///
/// If both `set` and `oldset` is `Some(..)`, the current signal mask will be written into oldset,
/// and then it will be updated with `set`.
///
/// If both `set` and `oldset` is None, this function is a no-op.
///
/// For more information, visit the [pthread_sigmask](http://man7.org/linux/man-pages/man3/pthread_sigmask.3.html),
/// or [sigprocmask](http://man7.org/linux/man-pages/man2/sigprocmask.2.html) man pages.
pub fn pthread_sigmask(how: HowFlag,
set: Option<&SigSet>,
oldset: Option<&mut SigSet>) -> Result<()> {
if set.is_none() && oldset.is_none() {
return Ok(())
}
let res = unsafe {
// if set or oldset is None, pass in null pointers instead
ffi::pthread_sigmask(how.bits(),
set.map_or_else(|| ptr::null::<sigset_t>(),
|s| &s.sigset as *const sigset_t),
oldset.map_or_else(|| ptr::null_mut::<sigset_t>(),
|os| &mut os.sigset as *mut sigset_t))
};
Errno::result(res).map(drop)
}
pub fn kill(pid: libc::pid_t, signum: SigNum) -> Result<()> {
let res = unsafe { ffi::kill(pid, signum) };
Errno::result(res).map(drop)
}
pub fn raise(signum: SigNum) -> Result<()> {
let res = unsafe { ffi::raise(signum) };
Errno::result(res).map(drop)
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_contains() {
let mut mask = SigSet::empty();
mask.add(SIGUSR1).unwrap();
assert_eq!(mask.contains(SIGUSR1), Ok(true));
assert_eq!(mask.contains(SIGUSR2), Ok(false));
let all = SigSet::all();
assert_eq!(all.contains(SIGUSR1), Ok(true));
assert_eq!(all.contains(SIGUSR2), Ok(true));
}
#[test]
fn test_thread_signal_block() {
let mut mask = SigSet::empty();
mask.add(SIGUSR1).unwrap();
assert!(mask.thread_block().is_ok());
}
#[test]
fn test_thread_signal_swap() {
let mut mask = SigSet::empty();
mask.add(SIGUSR1).unwrap();
mask.thread_block().unwrap();
assert!(SigSet::thread_get_mask().unwrap().contains(SIGUSR1).unwrap());
let mask2 = SigSet::empty();
mask.add(SIGUSR2).unwrap();
let oldmask = mask2.thread_swap_mask(SIG_SETMASK).unwrap();
assert!(oldmask.contains(SIGUSR1).unwrap());
assert!(!oldmask.contains(SIGUSR2).unwrap());
}
#[test]
fn test_sigwait() {
let mut mask = SigSet::empty();
mask.add(SIGUSR1).unwrap();
mask.add(SIGUSR2).unwrap();
mask.thread_block().unwrap();
raise(SIGUSR1).unwrap();
assert_eq!(mask.wait().unwrap(), SIGUSR1);
}
}
|