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refactoring get_stack to be cleaner

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This commit is contained in:
Dave Huseby 2016-01-27 16:46:45 -08:00
parent c83128eb60
commit 7803c8d688
1 changed files with 20 additions and 27 deletions
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47
src/libstd/sys/unix/stack_overflow.rs
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@ -140,46 +140,39 @@ mod imp {
target_os = "bitrig",
target_os = "netbsd",
target_os = "openbsd"))]
unsafe fn get_stack() -> *mut libc::c_void {
let stack = mmap(ptr::null_mut(),
SIGSTKSZ,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON,
-1,
0);
if stack == MAP_FAILED {
unsafe fn get_stack() -> libc::stack_t {
let stackp = mmap(ptr::null_mut(),
SIGSTKSZ,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON,
-1,
0);
if stackp == MAP_FAILED {
panic!("failed to allocate an alternative stack");
}
stack
libc::stack_t { ss_sp: stackp, ss_flags: 0, ss_size: SIGSTKSZ }
}
#[cfg(any(target_os = "dragonfly",
target_os = "freebsd"))]
unsafe fn get_stack() -> *mut i8 {
let stack = mmap(ptr::null_mut(),
SIGSTKSZ,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON,
-1,
0);
if stack == MAP_FAILED {
unsafe fn get_stack() -> libc::stack_t {
let stackp = mmap(ptr::null_mut(),
SIGSTKSZ,
PROT_READ | PROT_WRITE,
MAP_PRIVATE | MAP_ANON,
-1,
0);
if stackp == MAP_FAILED {
panic!("failed to allocate an alternative stack");
}
stack as *mut i8
libc::stack_t { ss_sp: stackp as *mut i8, ss_flags: 0, ss_size: SIGSTKSZ }
}
pub unsafe fn make_handler() -> Handler {
let alt_stack = get_stack();
let mut stack: libc::stack_t = mem::zeroed();
stack.ss_sp = alt_stack;
stack.ss_flags = 0;
stack.ss_size = SIGSTKSZ;
let stack = get_stack();
sigaltstack(&stack, ptr::null_mut());
Handler { _data: alt_stack as *mut libc::c_void }
Handler { _data: stack.ss_sp as *mut libc::c_void }
}
pub unsafe fn drop_handler(handler: &mut Handler) {