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| author | Rich Felker <dalias@aerifal.cx> | 2011-05-07 23:23:58 -0400 |
|---|---|---|
| committer | Rich Felker <dalias@aerifal.cx> | 2011-05-07 23:23:58 -0400 |
| commit | 99b8a25e941e54537bf39ca2f265c345f393f112 (patch) | |
| tree | 758faba1a20af40b5d09221d008eddbc704636fa /src/stdio/vsprintf.c | |
| parent | 77f15d108ee021d4dfbeebe793661131c4470d4d (diff) | |
| download | musl-99b8a25e941e54537bf39ca2f265c345f393f112.tar.gz | |
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.
Diffstat (limited to 'src/stdio/vsprintf.c')
0 files changed, 0 insertions, 0 deletions