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Support other SigStackFlags

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This commit is contained in:
Fabing Li
2024-11-01 06:54:48 +00:00
committed by Tate, Hongliang Tian
parent 561516df98
commit 7a08d9a660
4 changed files with 41 additions and 16 deletions
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22
kernel/src/process/signal/sig_stack.rs
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@ -18,6 +18,8 @@ pub struct SigStack {
bitflags! {
pub struct SigStackFlags: u32 {
const SS_ONSTACK = 1 << 0;
const SS_DISABLE = 1 << 1;
const SS_AUTODISARM = 1 << 31;
}
}
@ -57,16 +59,16 @@ impl SigStack {
}
pub fn status(&self) -> SigStackStatus {
if self.handler_counter == 0 {
return SigStackStatus::SS_INACTIVE;
}
// Learning From [sigaltstack doc](https://man7.org/linux/man-pages/man2/sigaltstack.2.html):
// If the stack is currently executed on,
// 1. If the stack was established with flag SS_AUTODISARM, the stack status is DISABLE,
// 2. otherwise, the stack status is ONSTACK
if self.flags.contains(SigStackFlags::SS_AUTODISARM) {
SigStackStatus::SS_DISABLE
if self.handler_counter == 0 {
if self.flags.contains(SigStackFlags::SS_AUTODISARM) {
SigStackStatus::SS_DISABLE
} else {
SigStackStatus::SS_INACTIVE
}
} else {
SigStackStatus::SS_ONSTACK
}
@ -85,11 +87,13 @@ impl SigStack {
/// Determines whether the stack is executed on by any signal handler
pub fn is_active(&self) -> bool {
// FIXME: can DISABLE stack be used?
self.handler_counter != 0 && !self.flags.contains(SigStackFlags::SS_AUTODISARM)
(self.handler_counter > 0)
&& !(self.flags.intersects(SigStackFlags::SS_AUTODISARM)
|| self.flags.intersects(SigStackFlags::SS_DISABLE))
}
pub fn is_disabled(&self) -> bool {
self.handler_counter != 0 && self.flags.contains(SigStackFlags::SS_AUTODISARM)
self.flags.contains(SigStackFlags::SS_DISABLE)
|| (self.handler_counter > 0 && self.flags.contains(SigStackFlags::SS_AUTODISARM))
}
}