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Implement raise() with getcontext() / setcontext()

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Justine Tunney 2023-11-05 17:52:30 -08:00
parent dd83db9567
commit 736fdb757a
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GPG key ID: BE714B4575D6E328
12 changed files with 73 additions and 97 deletions
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14
libc/calls/sigaction.c
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@ -479,13 +479,6 @@ static int __sigaction(int sig, const struct sigaction *act,
* spawned your process, happened to call `setrlimit()`. Doing this is
* a wonderful idea.
*
* Using signals might make your C runtime slower. Upon successfully
* installing its first signal handling function, sigaction() will set
* the global variable `__interruptible` to true, to let everything else
* know that signals are in play. That way code which would otherwise be
* frequently calling sigprocmask() out of an abundance of caution, will
* no longer need to pay its outrageous cost.
*
* Signal handlers should avoid clobbering global variables like `errno`
* because most signals are asynchronous, i.e. the signal handler might
* be called at any assembly instruction. If something like a `SIGCHLD`
@ -506,13 +499,6 @@ int sigaction(int sig, const struct sigaction *act, struct sigaction *oldact) {
rc = einval();
} else {
rc = __sigaction(sig, act, oldact);
if (!rc && act && (uintptr_t)act->sa_handler >= kSigactionMinRva) {
static bool once;
if (!once) {
__interruptible = true;
once = true;
}
}
}
STRACE("sigaction(%G, %s, [%s]) → %d% m", sig, DescribeSigaction(0, act),
DescribeSigaction(rc, oldact), rc);