2 Commits

Author	SHA1	Message	Date
Dmitry V. Levin	38593e942a	Rewrite signal mask decoding without sigset_t ... The sigset_t provided by libc is not quite convenient. In glibc, sigset_t is an array with space for 1024 bits, which is much more than required: all architectures supported by Linux have only 64 signals except MIPS, which has 128. In bionic libc, LP32 sigset_t is only 4 bytes long, which is less than necessary. With this change, signal mask is decoded without use of intermediate sigset_t structure, which saves us some cpu cycles in case of glibc with its inflated sigset_t, and enables build with libcs where sigset_t is broken. Old implementation used to check each signal number in the given signal mask twice using sigismember(). New implementation is based on popcount and next_set_bit() so it's noticeably faster. * configure.ac: Check for __builtin_popcount. * signal.c: Ensure that NSIG >= 32. (sprintsigmask, sprintsigmask_long, printsigmask): Remove. (popcount32, sprintsigmask_n): New functions. (tprintsigmask_addr, sprintsigmask_val, tprintsigmask_val): New macros. (print_sigset_addr_len, sys_sigsetmask, sys_sigreturn, sys_siggetmask, sys_sigsuspend, sys_sigprocmask, decode_new_sigaction): Update to use new signal mask decoding interface. * tests/sigaction.c (main): Add a test with almost filled signal mask. * tests/sigaction.awk: Update.	2014-02-27 00:28:39 +00:00
Dmitry V. Levin	66a15a5bb8	tests: add a test for rt_sigaction output ... Since "struct sigaction" varies between architectures, rt_sigaction decoding sometimes produces incorrect output. This test is expected to catch basic rt_sigaction decoding bugs. Based on a patch proposed by Chris Dearman. * tests/sigaction.c: New file. * tests/sigaction.awk: Likewise. * tests/sigaction.sh: New test. * tests/Makefile.am (check_PROGRAMS): Add sigaction. (TESTS): Add sigaction.sh. (EXTRA_DIST): Add sigaction.awk. * tests/.gitignore: Add sigaction.	2014-01-08 17:48:25 +00:00