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Discard ignored signals on New Technology (#592)

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Gavin Hayes 2022-09-05 12:17:56 -04:00 • committed by GitHub
parent 4b4ea046c4
commit 7de2f229a7
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4 changed files with 57 additions and 1 deletions
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37
libc/calls/sig2.c
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@ -246,7 +246,7 @@ textwindows int __sig_add(int sig, int si_code) {
}
/**
* Enqueues generic signal for delivery on New Technology.
* Checks for unblocked signals and delivers them on New Technology.
*
* @param restartable is for functions like read() but not poll()
* @return true if EINTR should be returned by caller
@ -264,3 +264,38 @@ textwindows bool __sig_check(bool restartable) {
}
return delivered;
}
/**
* Determines if a signal should be ignored and if so discards existing
* instances of said signal on New Technology.
*
* Even blocked signals are discarded.
*
* @param sig the signal number to remove
* @threadsafe
*/
textwindows void __sig_check_ignore(const int sig, const unsigned rva) {
struct Signal *cur, *prev, *next;
if (rva != (unsigned)(intptr_t)SIG_IGN &&
(rva != (unsigned)(intptr_t)SIG_DFL || __sig_isfatal(sig))) {
return;
}
if (__sig.queue) {
__sig_lock();
for (prev = 0, cur = __sig.queue; cur; cur = next) {
next = cur->next;
if (sig == cur->sig) {
if (cur == __sig.queue) {
__sig.queue = cur->next;
} else if (prev) {
prev->next = cur->next;
}
__sig_handle(false, cur->sig, cur->si_code, 0);
__sig_free(cur);
} else {
prev = cur;
}
}
__sig_unlock();
}
}