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authorRich Felker <dalias@aerifal.cx>2011-05-07 23:23:58 -0400
committerRich Felker <dalias@aerifal.cx>2011-05-07 23:23:58 -0400
commit99b8a25e941e54537bf39ca2f265c345f393f112 (patch)
tree758faba1a20af40b5d09221d008eddbc704636fa /Makefile
parent77f15d108ee021d4dfbeebe793661131c4470d4d (diff)
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overhaul implementation-internal signal protections
the new approach relies on the fact that the only ways to create
sigset_t objects without invoking UB are to use the sig*set()
functions, or from the masks returned by sigprocmask, sigaction, etc.
or in the ucontext_t argument to a signal handler. thus, as long as
sigfillset and sigaddset avoid adding the "protected" signals, there
is no way the application will ever obtain a sigset_t including these
bits, and thus no need to add the overhead of checking/clearing them
when sigprocmask or sigaction is called.

note that the old code actually *failed* to remove the bits from
sa_mask when sigaction was called.

the new implementations are also significantly smaller, simpler, and
faster due to ignoring the useless "GNU HURD signals" 65-1024, which
are not used and, if there's any sanity in the world, never will be
used.
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