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Rollup merge of #87528 - :stack_overflow_obsd, r=joshtriplett

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stack overflow handler specific openbsd change.
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Guillaume Gomez 2021-10-09 17:08:38 +02:00 committed by GitHub
commit 3e4f95612e
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1 changed files with 9 additions and 8 deletions
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17
library/std/src/sys/unix/stack_overflow.rs
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@ -143,14 +143,15 @@ pub unsafe fn cleanup() {
}
unsafe fn get_stackp() -> *mut libc::c_void {
let stackp = mmap(
ptr::null_mut(),
SIGSTKSZ + page_size(),
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON,
-1,
0,
);
// OpenBSD requires this flag for stack mapping
// otherwise the said mapping will fail as a no-op on most systems
// and has a different meaning on FreeBSD
#[cfg(any(target_os = "openbsd", target_os = "netbsd", target_os = "linux",))]
let flags = MAP_PRIVATE | MAP_ANON | libc::MAP_STACK;
#[cfg(not(any(target_os = "openbsd", target_os = "netbsd", target_os = "linux",)))]
let flags = MAP_PRIVATE | MAP_ANON;
let stackp =
mmap(ptr::null_mut(), SIGSTKSZ + page_size(), PROT_READ | PROT_WRITE, flags, -1, 0);
if stackp == MAP_FAILED {
panic!("failed to allocate an alternative stack: {}", io::Error::last_os_error());
}