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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::Errno;
use std::mem;
use std::ptr;
use {Error, Result};
pub use libc::consts::os::posix88::{
SIGHUP, // 1
SIGINT, // 2
SIGQUIT, // 3
SIGILL, // 4
SIGABRT, // 6
SIGFPE, // 8
SIGKILL, // 9
SIGSEGV, // 11
SIGPIPE, // 13
SIGALRM, // 14
SIGTERM, // 15
};
pub use self::signal::{
SIGTRAP,
SIGIOT,
SIGBUS,
SIGSYS,
SIGURG,
SIGSTOP,
SIGTSTP,
SIGCONT,
SIGCHLD,
SIGTTIN,
SIGTTOU,
SIGIO,
SIGXCPU,
SIGXFSZ,
SIGVTALRM,
SIGPROF,
SIGWINCH,
SIGUSR1,
SIGUSR2,
NSIG,
};
pub use self::signal::SockFlag;
pub use self::signal::{HowFlag, SIG_BLOCK, SIG_UNBLOCK, SIG_SETMASK};
pub use self::signal::sigset_t;
// This doesn't always exist, but when it does, it's 7
pub const SIGEMT: libc::c_int = 7;
#[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;
bitflags!(
flags SockFlag: libc::c_ulong {
const SA_NOCLDSTOP = 0x00000001,
const SA_NOCLDWAIT = 0x00000002,
const SA_NODEFER = 0x40000000,
const SA_ONSTACK = 0x08000000,
const SA_RESETHAND = 0x80000000,
const SA_RESTART = 0x10000000,
const SA_SIGINFO = 0x00000004,
}
);
bitflags!{
flags HowFlag: libc::c_int {
const SIG_BLOCK = 0,
const SIG_UNBLOCK = 1,
const SIG_SETMASK = 2,
}
}
pub const SIGTRAP: libc::c_int = 5;
pub const SIGIOT: libc::c_int = 6;
pub const SIGBUS: libc::c_int = 7;
pub const SIGUSR1: libc::c_int = 10;
pub const SIGUSR2: libc::c_int = 12;
pub const SIGSTKFLT: libc::c_int = 16;
pub const SIGCHLD: libc::c_int = 17;
pub const SIGCONT: libc::c_int = 18;
pub const SIGSTOP: libc::c_int = 19;
pub const SIGTSTP: libc::c_int = 20;
pub const SIGTTIN: libc::c_int = 21;
pub const SIGTTOU: libc::c_int = 22;
pub const SIGURG: libc::c_int = 23;
pub const SIGXCPU: libc::c_int = 24;
pub const SIGXFSZ: libc::c_int = 25;
pub const SIGVTALRM: libc::c_int = 26;
pub const SIGPROF: libc::c_int = 27;
pub const SIGWINCH: libc::c_int = 28;
pub const SIGIO: libc::c_int = 29;
pub const SIGPOLL: libc::c_int = 29;
pub const SIGPWR: libc::c_int = 30;
pub const SIGSYS: libc::c_int = 31;
pub const SIGUNUSED: libc::c_int = 31;
pub const NSIG: libc::c_int = 32;
// 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;
bitflags!(
flags SockFlag: libc::c_uint {
const SA_NOCLDSTOP = 0x00000001,
const SA_NOCLDWAIT = 0x00001000,
const SA_NODEFER = 0x40000000,
const SA_ONSTACK = 0x08000000,
const SA_RESETHAND = 0x80000000,
const SA_RESTART = 0x10000000,
const SA_SIGINFO = 0x00000008,
}
);
bitflags!{
flags HowFlag: libc::c_int {
const SIG_BLOCK = 1,
const SIG_UNBLOCK = 2,
const SIG_SETMASK = 3,
}
}
pub const SIGTRAP: libc::c_int = 5;
pub const SIGIOT: libc::c_int = 6;
pub const SIGBUS: libc::c_int = 10;
pub const SIGSYS: libc::c_int = 12;
pub const SIGUSR1: libc::c_int = 16;
pub const SIGUSR2: libc::c_int = 17;
pub const SIGCHLD: libc::c_int = 18;
pub const SIGCLD: libc::c_int = 18;
pub const SIGPWR: libc::c_int = 19;
pub const SIGWINCH: libc::c_int = 20;
pub const SIGURG: libc::c_int = 21;
pub const SIGIO: libc::c_int = 22;
pub const SIGPOLL: libc::c_int = 22;
pub const SIGSTOP: libc::c_int = 23;
pub const SIGTSTP: libc::c_int = 24;
pub const SIGCONT: libc::c_int = 25;
pub const SIGTTIN: libc::c_int = 26;
pub const SIGTTOU: libc::c_int = 27;
pub const SIGVTALRM: libc::c_int = 28;
pub const SIGPROF: libc::c_int = 29;
pub const SIGXCPU: libc::c_int = 30;
pub const SIGFSZ: libc::c_int = 31;
pub const NSIG: libc::c_int = 32;
// 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;
bitflags!(
flags SockFlag: libc::c_int {
const SA_NOCLDSTOP = 0x0008,
const SA_NOCLDWAIT = 0x0020,
const SA_NODEFER = 0x0010,
const SA_ONSTACK = 0x0001,
const SA_RESETHAND = 0x0004,
const SA_RESTART = 0x0002,
const SA_SIGINFO = 0x0040,
}
);
bitflags!{
flags HowFlag: libc::c_int {
const SIG_BLOCK = 1,
const SIG_UNBLOCK = 2,
const SIG_SETMASK = 3,
}
}
pub const SIGTRAP: libc::c_int = 5;
pub const SIGIOT: libc::c_int = 6;
pub const SIGBUS: libc::c_int = 10;
pub const SIGSYS: libc::c_int = 12;
pub const SIGURG: libc::c_int = 16;
pub const SIGSTOP: libc::c_int = 17;
pub const SIGTSTP: libc::c_int = 18;
pub const SIGCONT: libc::c_int = 19;
pub const SIGCHLD: libc::c_int = 20;
pub const SIGTTIN: libc::c_int = 21;
pub const SIGTTOU: libc::c_int = 22;
pub const SIGIO: libc::c_int = 23;
pub const SIGXCPU: libc::c_int = 24;
pub const SIGXFSZ: libc::c_int = 25;
pub const SIGVTALRM: libc::c_int = 26;
pub const SIGPROF: libc::c_int = 27;
pub const SIGWINCH: libc::c_int = 28;
pub const SIGINFO: libc::c_int = 29;
pub const SIGUSR1: libc::c_int = 30;
pub const SIGUSR2: libc::c_int = 31;
pub const NSIG: libc::c_int = 32;
#[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;
}
}
#[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) };
if res < 0 {
return Err(Error::Sys(Errno::last()));
}
Ok(())
}
pub fn remove(&mut self, signum: SigNum) -> Result<()> {
let res = unsafe { ffi::sigdelset(&mut self.sigset as *mut sigset_t, signum) };
if res < 0 {
return Err(Error::Sys(Errno::last()));
}
Ok(())
}
pub fn contains(&self, signum: SigNum) -> Result<bool> {
let res = unsafe { ffi::sigismember(&self.sigset as *const sigset_t, signum) };
match res {
1 => Ok(true),
0 => Ok(false),
_ => Err(Error::Sys(Errno::last()))
}
}
/// 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)
}
}
impl AsRef<sigset_t> for SigSet {
fn as_ref(&self) -> &sigset_t {
&self.sigset
}
}
type sigaction_t = self::signal::sigaction;
pub struct SigAction {
sigaction: sigaction_t
}
impl SigAction {
pub fn new(handler: extern fn(libc::c_int), flags: SockFlag, mask: SigSet) -> SigAction {
let mut s = unsafe { mem::uninitialized::<sigaction_t>() };
s.sa_handler = handler;
s.sa_flags = flags;
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);
if res < 0 {
return Err(Error::Sys(Errno::last()));
}
Ok(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))
};
if res != 0 {
return Err(Error::Sys(Errno::last()));
}
Ok(())
}
pub fn kill(pid: libc::pid_t, signum: SigNum) -> Result<()> {
let res = unsafe { ffi::kill(pid, signum) };
if res < 0 {
return Err(Error::Sys(Errno::last()));
}
Ok(())
}
#[cfg(test)]
mod tests {
use super::*;
#[test]
fn test_contains() {
let mut mask = SigSet::empty();
mask.add(signal::SIGUSR1).unwrap();
assert_eq!(mask.contains(signal::SIGUSR1), Ok(true));
assert_eq!(mask.contains(signal::SIGUSR2), Ok(false));
let all = SigSet::all();
assert_eq!(all.contains(signal::SIGUSR1), Ok(true));
assert_eq!(all.contains(signal::SIGUSR2), Ok(true));
}
#[test]
fn test_thread_signal_block() {
let mut mask = SigSet::empty();
mask.add(signal::SIGUSR1).unwrap();
assert!(mask.thread_block().is_ok());
}
#[test]
fn test_thread_signal_swap() {
let mut mask = SigSet::empty();
mask.add(signal::SIGUSR1).unwrap();
mask.thread_block().unwrap();
assert!(SigSet::thread_get_mask().unwrap().contains(SIGUSR1).unwrap());
let mask2 = SigSet::empty();
mask.add(signal::SIGUSR2).unwrap();
let oldmask = mask2.thread_swap_mask(signal::SIG_SETMASK).unwrap();
assert!(oldmask.contains(signal::SIGUSR1).unwrap());
assert!(!oldmask.contains(signal::SIGUSR2).unwrap());
}
}
|