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Polyfill SA_RESETHAND on MacOS ARM64

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This change solves the XNU crash loop mystery. Apple's documentation
claims to support this feature, but they only define the constant in
their header files. The kernel acknowledges thi SA_RESETHAND bit, by
clearing it from the sa_flags state, returns zero, and does nothing.
This commit is contained in:
Justine Tunney 2024-05-08 03:47:43 -07:00
parent 952b9009e8
commit 793393a341
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GPG key ID: BE714B4575D6E328
3 changed files with 23 additions and 2 deletions
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6
libc/calls/sigaction.c
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@ -252,6 +252,12 @@ static int __sigaction(int sig, const struct sigaction *act,
rc = sys_sigaction(sig, ap, oldact, arg4, arg5);
} else {
rc = _sysret(__syslib->__sigaction(sig, ap, oldact));
// xnu silicon claims to support sa_resethand but it does nothing
// this can be tested, since it clears the bit from flags as well
if (!rc && oldact &&
(((struct sigaction_silicon *)ap)->sa_flags & SA_RESETHAND)) {
((struct sigaction_silicon *)oldact)->sa_flags |= SA_RESETHAND;
}
}
if (rc != -1) {
sigaction_native2cosmo((union metasigaction *)oldact);