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Install signal handler only once.

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This commit is contained in:
losfair 2018-11-28 13:21:03 +08:00
parent b9714e1ce1
commit 319bd08905
1 changed files with 6 additions and 2 deletions
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8
src/recovery.rs
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@ -5,6 +5,7 @@
//! unless you have memory unsafety elsewhere in your code.
use std::cell::UnsafeCell;
use std::sync::Once;
extern "C" {
pub fn setjmp(env: *mut ::nix::libc::c_void) -> ::nix::libc::c_int;
@ -12,6 +13,7 @@ extern "C" {
}
const SETJMP_BUFFER_LEN: usize = 27;
pub static SIGHANDLER_INIT: Once = Once::new();
thread_local! {
pub static SETJMP_BUFFER: UnsafeCell<[::nix::libc::c_int; SETJMP_BUFFER_LEN]> = UnsafeCell::new([0; SETJMP_BUFFER_LEN]);
@ -28,7 +30,7 @@ thread_local! {
macro_rules! call_protected {
($x:expr) => {
unsafe {
use crate::recovery::{setjmp, SETJMP_BUFFER};
use crate::recovery::{setjmp, SETJMP_BUFFER, SIGHANDLER_INIT};
use crate::sighandler::install_sighandler;
use crate::webassembly::ErrorKind;
@ -37,7 +39,9 @@ macro_rules! call_protected {
let jmp_buf = SETJMP_BUFFER.with(|buf| buf.get());
let prev_jmp_buf = *jmp_buf;
install_sighandler();
SIGHANDLER_INIT.call_once(|| {
install_sighandler();
});
let signum = setjmp(jmp_buf as *mut ::nix::libc::c_void);
if signum != 0 {