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2012-05-25fix regex on armRich Felker-1/+1
TRE has a broken assumption that wchar_t is signed, which is a sane expectation, but not required by the standard, and false on ARM's ABI. i leave tre_char_t as wchar_t for now, since a pointer to it is directly passed to functions that need pointer to wchar_t. it does not seem to break anything. and since the maximum unicode scalar value is 0x10ffff, just use that explicitly rather than using the max value of any particular C type.
2012-05-25remove cruft from pthread structure (old cancellation stuff)Rich Felker-2/+0
2012-05-25remove leftover cp_sp cruft from cancellation code, fix small bugRich Felker-3/+1
the bug was that cancellation requests which arrived while a cancellation point was interrupted by a signal handler would not be acted upon when the signal handler returns. this was because cp_sp was never set; it's no longer needed or used. instead, just always re-raise the signal when cancellation was not acted upon. this wastes a tiny amount of time in the rare case where it even matters, but it ensures correctness and simplifies the code.
2012-05-24avoid deprecated (by linux) alarm syscall; use setitimer insteadRich Felker-1/+4
2012-05-24linux deprecated SYS_utime on some archs, so use SYS_utimes insteadRich Felker-1/+8
the old code could be kept for cases where SYS_utime is available, but it's not really worth the ifdef ugliness. and better to avoid deprecated stuff just in case the kernel devs ever get crazy enough to start removing it from archs where it was part of the ABI and breaking static bins...
2012-05-23fix bad opcode in arm syscall_cp_asmRich Felker-1/+1
2012-05-23fix issue with longjmp out of signal handlers and cancellationRich Felker-52/+35
stale state information indicating that a thread was possibly blocked at a cancellation point could get left behind if longjmp was used to exit a signal handler that interrupted a cancellation point. to fix the issue, we throw away the state information entirely and simply compare the saved instruction pointer to a range of code addresses in the __syscall_cp_asm function. all the ugly PIC work (which becomes minimal anyway with this approach) is defered to cancellation time instead of happening at every syscall, which should improve performance too. this commit also fixes cancellation on arm, which was mildly broken (race condition, not checking cancellation flag once inside the cancellation point zone). apparently i forgot to implement that. the new arm code is untested, but appears correct; i'll test and fix it later if there are problems.
2012-05-23simplify cancellation push/pop slightlyRich Felker-12/+9
no need to pass unnecessary extra arguments on to the core code in pthread_create.c. this just wastes cycles and code bloat.
2012-05-22remove everything related to forkallRich Felker-77/+0
i made a best attempt, but the intended semantics of this function are fundamentally contradictory. there is no consistent way to handle ownership of locks when forking a multi-threaded process. the code could have worked by accident for programs that only used normal mutexes and nothing else (since they don't actually store or care about their owner), but that's about it. broken-by-design interfaces that aren't even in glibc (only solaris) don't belong in musl.
2012-05-21fix typo in utimes function that made it mess up file timesRich Felker-1/+1
2012-05-21fix out-of-bounds array access in pthread barriers on 64-bitRich Felker-1/+1
it's ok to overlap with integer slot 3 on 32-bit because only slots 0-2 are used on process-local barriers.
2012-05-16fix misplaced semicolon in preprocessor directive (#undef h_errno)Rich Felker-1/+1
2012-05-13remove some no-op end of string tests from regex parserRich Felker-4/+0
these are cruft from the original code which used an explicit string length rather than null termination. i blindly converted all the checks to null terminator checks, without noticing that in several cases, the subsequent switch statement would automatically handle the null byte correctly.
2012-05-13another BRE fix: in ^*, * is literalRich Felker-0/+2
i don't understand why this has to be conditional on being in BRE mode, but enabling this code unconditionally breaks a huge number of ERE test cases.
2012-05-13let sysconf accurately report # of cpus availableRich Felker-2/+10
i've been trying out openmp and it seems like it won't be much use without this...
2012-05-12use __h_errno_location for h_errnoRich Felker-0/+9
we do not bother making h_errno thread-local since the only interfaces that use it are inherently non-thread-safe. but still use the potentially-thread-local ABI to access it just to avoid lock-in.
2012-05-13search: add comments to tsearch_avl.cnsz-0/+6
2012-05-13search: add tdestroy (gnu extension)nsz-0/+21
2012-05-10Merge remote-tracking branch 'nsz/master'Rich Felker-5/+8
2012-05-10remove __lock dependency from exitRich Felker-2/+4
there's no sense in using a powerful lock in exit, because it will never be unlocked. a thread that arrives at exit while exit is already in progress just needs to hang forever. use the pause syscall for this because it's cheap and easy and universally available.
2012-05-10fix missing static (namespace clash)Rich Felker-1/+1
2012-05-08math: fix remquo.c when x==-y and a subnormal remainder bug as wellnsz-5/+8
backported fix from freebsd: http://svnweb.FreeBSD.org/base?view=revision&revision=233973
2012-05-07some assemblers don't like fistpq; use the alt. mnemonic fistpllRich Felker-3/+3
2012-05-07fix error checking for \ at end of regex (this was broken previously)Rich Felker-1/+1
2012-05-07fix copy and paste error in regex code causing mishandling of \) in BRERich Felker-1/+1
2012-05-07fix regex breakage in last commit (failure to handle empty regex, etc.)Rich Felker-4/+1
2012-05-07fix ugly bugs in TRE regex parserRich Felker-60/+31
1. * in BRE is not special at the beginning of the regex or a subexpression. this broke ncurses' build scripts. 2. \\( in BRE is a literal \ followed by a literal (, not a literal \ followed by a subexpression opener. 3. the ^ in \\(^ in BRE is a literal ^ only at the beginning of the entire BRE. POSIX allows treating it as an anchor at the beginning of a subexpression, but TRE's code for checking if it was at the beginning of a subexpression was wrong, and fixing it for the sake of supporting a non-portable usage was too much trouble when just removing this non-portable behavior was much easier. this patch also moved lots of the ugly logic for empty atom checking out of the default/literal case and into new cases for the relevant characters. this should make parsing faster and make the code smaller. if nothing else it's a lot more readable/logical. at some point i'd like to revisit and overhaul lots of this code...
2012-05-06add FORCE_EVAL macro to evaluate float expr for their side effectnsz-24/+25
updated nextafter* to use FORCE_EVAL, it can be used in many other places in the math code to improve readability.
2012-05-06fix unused variable warnings in new nextafter/nexttoward codeRich Felker-6/+12
apparently initializing a variable is not "using" it but assigning to it is "using" it. i don't really like this fix, but it's better than trying to make a bigger cleanup just before a release, and it should work fine (tested against nsz's math tests).
2012-05-06Merge remote-tracking branch 'nsz/master'Rich Felker-291/+176
2012-05-06add isastream (obsolete STREAMS junk)Rich Felker-0/+7
apparently some packages see stropts.h and want to be able to use this. the implementation checks that the file descriptor is valid by using fcntl/F_GETFD so it can report an error if not (as specified).
2012-05-06math: nextafter and nexttoward cleanupnsz-291/+176
make nexttoward, nexttowardf independent of long double representation. fix nextafterl: it did not raise underflow flag when the result was 0.
2012-05-05update license of njk contributed code (x86_64 asm)Rich Felker-5/+5
these changes are based on the following communication via email: "I hereby grant that all of the code I have contributed to musl on or before April 23, 2012 may be licensed under the terms of the following MIT license: Copyright (c) 2011-2012 Nicholas J. Kain Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE."
2012-05-04make pthread stacks non-executableRich Felker-1/+1
this change is necessary or pthread_create will always fail on security-hardened kernels. i considered first trying to make the stack executable and simply retrying without execute permissions when the first try fails, but (1) this would incur a serious performance penalty on hardened systems, and (2) having the stack be executable is just a bad idea from a security standpoint. if there is real-world "GNU C" code that uses nested functions with threads, and it can't be fixed, we'll have to consider other ways of solving the problem, but for now this seems like the best fix.
2012-05-04Merge remote-tracking branch 'nsz/master'Rich Felker-20/+16
2012-05-04fix error reporting for dlsym with global symbolsRich Felker-1/+2
2012-05-05math: change the formula used for acos.snsz-20/+16
old: 2*atan2(sqrt(1-x),sqrt(1+x)) new: atan2(fabs(sqrt((1-x)*(1+x))),x) improvements: * all edge cases are fixed (sign of zero in downward rounding) * a bit faster (here a single call is about 131ns vs 162ns) * a bit more precise (at most 1ulp error on 1M uniform random samples in [0,1), the old formula gave some 2ulp errors as well)
2012-05-04fix uninitialized var in vfwprintf printing 0-prec stringRich Felker-1/+1
this could lead to spurious failures of wide printf functions
2012-05-03avoid setting nondefault scheduler tooRich Felker-1/+1
2012-05-03implement stub versions of sched_*Rich Felker-0/+49
these actually work, but for now they prohibit actually setting priority levels and report min/max priority as 0.
2012-05-03overhaul SSP support to use a real canaryRich Felker-12/+25
pthread structure has been adjusted to match the glibc/GCC abi for where the canary is stored on i386 and x86_64. it will need variants for other archs to provide the added security of the canary's entropy, but even without that it still works as well as the old "minimal" ssp support. eventually such changes will be made anyway, since they are also needed for GCC/C11 thread-local storage support (not yet implemented). care is taken not to attempt initializing the thread pointer unless the program actually uses SSP (by reference to __stack_chk_fail).
2012-05-02fix longstanding exit logic bugs in mbsnrtowcs and wcsnrtombsRich Felker-4/+9
these are POSIX 2008 (previously GNU extension) functions that are rarely used. apparently they had never been tested before, since the end-of-string logic was completely missing. mbsnrtowcs is used by modern versions of bash for its glob implementation, and and this bug was causing tab completion to hang in an infinite loop.
2012-05-01support alternate glibc name pow10 for exp10Rich Felker-0/+9
2012-04-30add C stub for sqrtl (already implemented in asm on i386 and x86_64)Rich Felker-0/+9
2012-04-30first try at writing an efficient and "correct" exp10Rich Felker-0/+55
this is a nonstandard function so it's not clear what conditions it should satisfy. my intent is that it be fast and exact for positive integral exponents when the result fits in the destination type, and fast and correctly rounded for small negative integral exponents. otherwise we aim for at most 1ulp error; it seems to differ from pow by at most 1ulp and it's often 2-5 times faster than pow.
2012-04-30make stack protector work with gcc configured for non-tls canaryRich Felker-0/+2
2012-04-30fix off-by-one error that caused uninitialized memory read in floatscanRich Felker-1/+1
this caused misreading of certain floating point values that are exact multiples of large powers of ten, unpredictable depending on prior stack contents.
2012-04-29fix typo in the x86_64 rounding asmRich Felker-4/+4
2012-04-29new math asm (abs/rounding) for x86_64Rich Felker-0/+36
untested
2012-04-29add linux-specific unshare syscall wrapperRich Felker-0/+8