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* add ldd and main program loading support to dynamic linkerRich Felker2012-05-274-21/+89
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* cleanup dynamic linker start code cruftRich Felker2012-05-273-13/+6
| | | | | | | | | | | | | two actual issues: one is that __dynlink no longer wants/needs a GOT pointer argument, so the code to generate that argument can be removed. the other issue was that in the i386 code, argc/argv were being loaded into registers that would be call-clobbered, then copied to preserved registers, rather than just being loaded into the proper call-preserved registers to begin with. this cleanup is in preparation for adding new dynamic linker functionality (ability to explicitly invoke the dynamic linker to run a program).
* fix overrun (n essentially ignored) in wcsncmpRich Felker2012-05-261-1/+1
| | | | bug report and solution by Richard Pennington
* fix failure of mbsinit(0) (not UB; required to return nonzero)Rich Felker2012-05-261-1/+1
| | | | issue reported by Richard Pennington; slightly simpler fix applied
* fix failure of strrchr(str, 0)Rich Felker2012-05-261-1/+1
| | | | bug report and solution by Richard Pennington
* avoid using pthread cleanup push/pop in stdio when not neededRich Felker2012-05-252-6/+14
| | | | | | | | | | | | unfortunately in dynamic-linked programs, these macros cause pthread_self to be initialized, which costs a couple syscalls, and (much worse) would necessarily fail, crash, and burn on ancient (2.4 and earlier) kernels where setting up a thread pointer does not work. i'd like to do this in a more generic way that avoids all use of cleanup push/pop before pthread_self has been successfully called and avoids ugly if/else constructs like the one in this commit, but for now, this will suffice.
* ensure pthread-internal signals are unblocked before threads are usedRich Felker2012-05-251-0/+1
| | | | | | | | | | | if the process started with these signals blocked, cancellation could fail or setxid could deadlock. there is no way to globally unblock them after threads have been created. by unblocking them in the pthread_self initialization for the main thread, we ensure that they're unblocked before any other threads are created and also outside of any signal handler context (sigaction initialized pthread_self), which is important so that return from a signal handler won't re-block them.
* fix regex on armRich Felker2012-05-251-1/+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.
* remove cruft from pthread structure (old cancellation stuff)Rich Felker2012-05-251-2/+0
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* remove leftover cp_sp cruft from cancellation code, fix small bugRich Felker2012-05-251-3/+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.
* avoid deprecated (by linux) alarm syscall; use setitimer insteadRich Felker2012-05-241-1/+4
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* linux deprecated SYS_utime on some archs, so use SYS_utimes insteadRich Felker2012-05-241-1/+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...
* fix bad opcode in arm syscall_cp_asmRich Felker2012-05-231-1/+1
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* fix issue with longjmp out of signal handlers and cancellationRich Felker2012-05-234-52/+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.
* simplify cancellation push/pop slightlyRich Felker2012-05-232-12/+9
| | | | | no need to pass unnecessary extra arguments on to the core code in pthread_create.c. this just wastes cycles and code bloat.
* remove everything related to forkallRich Felker2012-05-223-77/+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.
* fix typo in utimes function that made it mess up file timesRich Felker2012-05-211-1/+1
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* fix out-of-bounds array access in pthread barriers on 64-bitRich Felker2012-05-211-1/+1
| | | | | it's ok to overlap with integer slot 3 on 32-bit because only slots 0-2 are used on process-local barriers.
* fix misplaced semicolon in preprocessor directive (#undef h_errno)Rich Felker2012-05-161-1/+1
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* remove some no-op end of string tests from regex parserRich Felker2012-05-131-4/+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.
* another BRE fix: in ^*, * is literalRich Felker2012-05-131-0/+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.
* let sysconf accurately report # of cpus availableRich Felker2012-05-131-2/+10
| | | | | i've been trying out openmp and it seems like it won't be much use without this...
* use __h_errno_location for h_errnoRich Felker2012-05-122-0/+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.
* search: add comments to tsearch_avl.cnsz2012-05-131-0/+6
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* search: add tdestroy (gnu extension)nsz2012-05-131-0/+21
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* Merge remote-tracking branch 'nsz/master'Rich Felker2012-05-103-5/+8
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| * math: fix remquo.c when x==-y and a subnormal remainder bug as wellnsz2012-05-083-5/+8
| | | | | | | | | | backported fix from freebsd: http://svnweb.FreeBSD.org/base?view=revision&revision=233973
* | remove __lock dependency from exitRich Felker2012-05-101-2/+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.
* | fix missing static (namespace clash)Rich Felker2012-05-101-1/+1
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* some assemblers don't like fistpq; use the alt. mnemonic fistpllRich Felker2012-05-073-3/+3
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* fix error checking for \ at end of regex (this was broken previously)Rich Felker2012-05-071-1/+1
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* fix copy and paste error in regex code causing mishandling of \) in BRERich Felker2012-05-071-1/+1
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* fix regex breakage in last commit (failure to handle empty regex, etc.)Rich Felker2012-05-071-4/+1
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* fix ugly bugs in TRE regex parserRich Felker2012-05-071-60/+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...
* add FORCE_EVAL macro to evaluate float expr for their side effectnsz2012-05-066-24/+25
| | | | | updated nextafter* to use FORCE_EVAL, it can be used in many other places in the math code to improve readability.
* fix unused variable warnings in new nextafter/nexttoward codeRich Felker2012-05-065-6/+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).
* Merge remote-tracking branch 'nsz/master'Rich Felker2012-05-065-291/+176
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| * math: nextafter and nexttoward cleanupnsz2012-05-065-291/+176
| | | | | | | | | | make nexttoward, nexttowardf independent of long double representation. fix nextafterl: it did not raise underflow flag when the result was 0.
* | add isastream (obsolete STREAMS junk)Rich Felker2012-05-061-0/+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).
* update license of njk contributed code (x86_64 asm)Rich Felker2012-05-055-5/+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."
* make pthread stacks non-executableRich Felker2012-05-041-1/+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.
* Merge remote-tracking branch 'nsz/master'Rich Felker2012-05-042-20/+16
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| * math: change the formula used for acos.snsz2012-05-052-20/+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)
* | fix error reporting for dlsym with global symbolsRich Felker2012-05-041-1/+2
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* fix uninitialized var in vfwprintf printing 0-prec stringRich Felker2012-05-041-1/+1
| | | | this could lead to spurious failures of wide printf functions
* avoid setting nondefault scheduler tooRich Felker2012-05-031-1/+1
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* implement stub versions of sched_*Rich Felker2012-05-037-0/+49
| | | | | these actually work, but for now they prohibit actually setting priority levels and report min/max priority as 0.
* overhaul SSP support to use a real canaryRich Felker2012-05-036-12/+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).
* fix longstanding exit logic bugs in mbsnrtowcs and wcsnrtombsRich Felker2012-05-022-4/+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.
* support alternate glibc name pow10 for exp10Rich Felker2012-05-013-0/+9
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