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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
2012-04-29fix longstanding missing static in mq_notify (namespace pollution)Rich Felker-1/+1
2012-04-28new fnmatch implementationRich Felker-131/+273
unlike the old one, this one's algorithm does not suffer from potential stack overflow issues or pathologically bad performance on certain patterns. instead of backtracking, it uses a matching algorithm which I have not seen before (unsure whether I invented or re-invented it) that runs in O(1) space and O(nm) time. it may be possible to improve the time to O(n), but not without significantly greater complexity.
2012-04-26update fnmatch to POSIX 2008 semanticsRich Felker-4/+11
an invalid bracket expression must be treated as if the opening bracket were just a literal character. this is to fix a bug whereby POSIX left the behavior of the "[" shell command undefined due to it being an invalid bracket expression.
2012-04-25gdb shared library debugging supportRich Felker-5/+32
provide the minimal level of dynamic linker-to-debugger glue needed to let gdb find loaded libraries and load their symbols.
2012-04-24first attempt at enabling stack protector supportRich Felker-0/+28
the code is written to pre-init the thread pointer in static linked programs that pull in __stack_chk_fail or dynamic-linked programs that lookup the symbol. no explicit canary is set; the canary will be whatever happens to be in the thread structure at the offset gcc hard-coded. this can be improved later.
2012-04-24ditch the priority inheritance locks; use malloc's version of lockRich Felker-77/+54
i did some testing trying to switch malloc to use the new internal lock with priority inheritance, and my malloc contention test got 20-100 times slower. if priority inheritance futexes are this slow, it's simply too high a price to pay for avoiding priority inversion. maybe we can consider them somewhere down the road once the kernel folks get their act together on this (and perferably don't link it to glibc's inefficient lock API)... as such, i've switch __lock to use malloc's implementation of lightweight locks, and updated all the users of the code to use an array with a waiter count for their locks. this should give optimal performance in the vast majority of cases, and it's simple. malloc is still using its own internal copy of the lock code because it seems to yield measurably better performance with -O3 when it's inlined (20% or more difference in the contention stress test).
2012-04-24internal locks: new owner of contended lock must set waiters flagRich Felker-1/+1
this bug probably would have gone unnoticed since it's only used in the fallback code for systems where priority-inheritance locking fails. unfortunately this approach results in one spurious wake syscall on the final unlock, when there are no waiters remaining. the alternative (possibly better) would be to use broadcast wakes instead of reflagging the waiter unconditionally, and let each waiter reflag itself; this saves one syscall at the expense of invoking the "thundering herd" effect (worse performance degredation) when there are many waiters. ideally we would be able to update all of our locks to use an array of two ints rather than a single int, and use a separate counter system like proper mutexes use; then we could avoid all spurious wake calls without resorting to broadcasts. however, it's not clear to me that priority inheritance futexes support this usage. the kernel sets the waiters flag for them (just like we're doing now) and i can't tell if it's safe to bypass the kernel when unlocking just because we know (from private data, the waiter count) that there are no waiters. this is something that could be explored in the future.
2012-04-24new internal locking primitive; drop spinlocksRich Felker-7/+29
we use priority inheritance futexes if possible so that the library cannot hit internal priority inversion deadlocks in the presence of realtime priority scheduling (full support to be added later).
2012-04-24new wcwidth implementation (fast table-based)Rich Felker-179/+125
i tried to go with improving the old binary-search-based algorithm, but between growth in the number of ranges, bad performance, and lack of confidence in the binary search code's stability under changes in the table, i decided it was worth the extra 1.8k to have something clean and maintainable. also note that, like the alpha and punct tables, there's definitely room to optimize the nonspacing/wide tables by overlapping subtables. this is not a high priority, but i've begun looking into how to do it, and i suspect the table sizes can be roughly halved. if that turns out to be true, the new, fast, table-based implementation will be roughly the same size as if i had just extended the old binary search one.
2012-04-23sync case mappings with unicode 6.1Rich Felker-8/+30
also special-case ß (U+00DF) as lowercase even though it does not have a mapping to uppercase. unicode added an uppercase version of this character but does not map it, presumably because the uppercase version is not actually used except for some obscure purpose...
2012-04-23optimize iswprintRich Felker-3/+12
2012-04-23fix spurious punct class for some surrogate codepoints (invalid)Rich Felker-59/+56
this happened due to their entries in UnicodeData.txt
2012-04-23destubify iswalpha and update iswpunct to unicode 6.1Rich Felker-135/+252
alpha is defined as unicode property "Alphabetic" plus category Nd minus ASCII digits minus 2 special-cased Thai punctuation marks supposedly misclassified by Unicode as letters. punct is defined as all of unicode except control, alphanumeric, and space characters. the tables were generated by a simple tool based on the code posted previously to the mailing list. in the future, this and other code used for maintaining locale/iconv/i18n data will be published either in the main source repository or in a separate locale data generation repository.
2012-04-23make dlerror produce informative resultsRich Felker-4/+15
note that dlerror is specified to be non-thread-safe, so no locking is performed on the error flag or message aside from the rwlock already held by dlopen or dlsym. if 2 invocations of dlsym are generating errors at the same time, they could clobber each other's results, but the resulting string, albeit corrupt, will still be null-terminated. any use of dlerror in such a situation could not be expected to give meaningful results anyway.
2012-04-22implement getusershell, etc. legacy functionsRich Felker-0/+33
I actually wrote these a month ago but forgot to integrate them. ugly, probably-harmful-to-use functions, but some legacy apps want them...
2012-04-22remove redundant (unmaintained) check in floatscanRich Felker-3/+3
also be extra careful to avoid wrapping the circular buffer early
2012-04-22add getresuid and getresgid syscall wrappersRich Felker-0/+16