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* fix race condition in raise - just mask signalsRich Felker2011-03-091-9/+9
| | | | | | | | a signal handler could fork after the pid/tid were read, causing the wrong process to be signalled. i'm not sure if this is supposed to have UB or not, but raise is async-signal-safe, so it probably is allowed. the current solution is slightly expensive so this implementation is likely to be changed in the future.
* fix raise semantics with threads.Rich Felker2011-03-091-1/+12
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* simplify and optimize pthread_mutex_trylockRich Felker2011-03-081-17/+16
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* rwlock trylock functions were wrongly returning EAGAIN instead of EBUSYRich Felker2011-03-082-3/+3
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* fix major breakage in pthread_once (it was always deadlocking)Rich Felker2011-03-081-8/+7
| | | | | | the issue was a break statement that was breaking only from the switch, not the enclosing for loop, and a failure to set the final success state.
* fix and optimize non-default-type mutex behaviorRich Felker2011-03-084-25/+19
| | | | | | | | | problem 1: mutex type from the attribute was being ignored by pthread_mutex_init, so recursive/errorchecking mutexes were never being used at all. problem 2: ownership of recursive mutexes was not being enforced at unlock time.
* implement pthread_mutexattr_[gs]etpshared functionsRich Felker2011-03-082-0/+16
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* disallow cpu time clocks as condattr clock valuesRich Felker2011-03-081-1/+1
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* fix off-by-one error in sem_(timed)wait (using old sem value instead of new)Rich Felker2011-03-071-1/+1
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* use the selected clock from the condattr for pthread_cond_timedwaitRich Felker2011-03-073-1/+3
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* implement pthread_rwlockattr_* (essentially no-ops)Rich Felker2011-03-074-0/+28
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* implement pthread_condattr_* interfacesRich Felker2011-03-076-0/+45
| | | | | note that, while the attributes are stored, they are not used in pthread_cond_init yet.
* reject invalid attribute settingsRich Felker2011-03-072-0/+2
| | | | | note that this is a pedantic conformance issue and waste of code. it only affects broken code or code that is probing for conformance.
* implement barrier attribute functions (essentially no-ops)Rich Felker2011-03-074-0/+27
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* enforce stack size min in pthread_attr_setstacksizeRich Felker2011-03-041-1/+1
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* implement POSIX semaphoresRich Felker2011-03-0410-0/+201
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* optimize POSIX TSD for fast pthread_getspecificRich Felker2011-03-034-9/+14
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* implement POSIX shared memoryRich Felker2011-03-032-0/+42
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* depends on settimeofday which needs _GNU_SOURCE feature testRich Felker2011-03-011-0/+1
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* implement futimens and utimensatRich Felker2011-02-272-0/+13
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* implement fexecveRich Felker2011-02-271-0/+10
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* cleanup utf-8 multibyte code, use visibility if possibleRich Felker2011-02-273-84/+5
| | | | | | | | | | | | | this code was written independently of musl, with support for a the backwards, nonstandard "31-bit unicode" some libraries/apps might want. unfortunately the extra code (inside #ifdef) makes the source harder to read and makes code that should be simple look complex, so i'm removing it. anyone who wants to use the old code can find it in the history or from elsewhere. also, change the visibility of the __fsmu8 state machine table to hidden, if supported. this should improve performance slightly in shared-library builds.
* fix missing prototype for strsignalRich Felker2011-02-261-0/+1
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* various changes in preparation for dynamic linking supportRich Felker2011-02-243-5/+21
| | | | | | | | | | | | | | | | | prefer using visibility=hidden for __libc internal data, rather than an accessor function, if the compiler has visibility. optimize with -O3 for PIC targets (shared library). without heavy inlining, reloading the GOT register in small functions kills performance. 20-30% size increase for a single libc.so is not a big deal, compared to comparaible size increase in every static binaries. use -Bsymbolic-functions, not -Bsymbolic. global variables are subject to COPY relocations, and thus binding their addresses in the library at link time will cause library functions to read the wrong (original) copies instead of the copies made in the main program's bss section. add entry point, _start, for dynamic linker.
* add implementation of memccpy functionRich Felker2011-02-241-0/+32
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* fix backwards conditional in stpncpyRich Felker2011-02-241-1/+1
| | | | | | this only made the function unnecessarily slow on systems with unaligned access, but would of course crash on systems that can't do unaligned accesses (none of which have ports yet).
* rewind must clear the error indicator in addition to seekingRich Felker2011-02-221-2/+5
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* change errno to static linkage (improves PIC code generation)Rich Felker2011-02-211-4/+2
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* remove sample utf-8 code that's not part of the standard libraryRich Felker2011-02-211-47/+0
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* use an accessor function for __libc data pointer when compiled as PICRich Felker2011-02-202-4/+19
| | | | | | | | | | | | | | prior to this change, a large portion of libc was unusable prior to relocation by the dynamic linker, due to dependence on the global data in the __libc structure and the need to obtain its address through the GOT. with this patch, the accessor function __libc_loc is now able to obtain the address of __libc via PC-relative addressing without using the GOT. this means the majority of libc functionality is now accessible right away. naturally, the above statements all depend on having an architecture where PC-relative addressing and jumps/calls are feasible, and a compiler that generates the appropriate code.
* avoid referencing address of extern function from vdprintfRich Felker2011-02-201-1/+6
| | | | | | | | this change is in preparation for upcoming PIC/shared library support. the intent is to avoid going through the GOT, mainly so that dprintf is operable immediately, prior to processing of relocations. having dprintf accessible from the dynamic linker will make writing and debugging the dynamic linker much easier.
* cleanup asprintf stuffRich Felker2011-02-202-2/+2
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* fix %n specifier, again. this time it was storing the wrong value.Rich Felker2011-02-201-7/+7
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* make malloc(0) return unique pointers rather than NULLRich Felker2011-02-202-6/+10
| | | | | | | this change is made with some reluctance, but i think it's for the best. correct programs must handle either behavior, so there is little advantage to having malloc(0) return NULL. and i managed to actually make the malloc code slightly smaller with this change.
* fix simple_malloc malloc(0) behavior not to return non-unique pointersRich Felker2011-02-201-0/+1
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* fix simple_malloc size restrictionsRich Felker2011-02-201-5/+6
| | | | | | do not allow allocations that overflow ptrdiff_t; fix some overflow checks that were not quite right but didn't matter due to address layout implementation.
* fix null pointer dereference introduced in last sigprocmask commitRich Felker2011-02-201-1/+1
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* make real symbols for the legacy (nonstandardized) utmp functionsRich Felker2011-02-201-0/+8
| | | | | | | this is needed in the long term for ABI compatibility anyway, and in the immediate, it helps with building broken programs like GNU screen that try to prototype the functions themselves rather than using the header.
* workaround gcc bug 46926 by providing a dumb sincos implementationRich Felker2011-02-191-0/+8
| | | | | | note that this library itself is built with -ffreestanding so sincos.c should not be miscompiled even if the gcc used to compile musl has this bug.
* use rt_sigprocmask, not legacy sigprocmask, syscall in pthread exit codeRich Felker2011-02-191-1/+1
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* implement the remaining clock_* interfacesRich Felker2011-02-195-0/+36
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* race condition fix: block all signals before decrementing thread countRich Felker2011-02-193-22/+2
| | | | | | | | | | | | the existence of a (kernelspace) thread must never have observable effects after the thread count is decremented. if signals are not blocked, it could end up handling the signal for rsyscall and contributing towards the count of threads which have changed ids, causing a thread to be missed. this could lead to one thread retaining unwanted privilege level. this change may also address other subtle race conditions in application code that uses signals.
* prevent sigprocmask/pthread_sigmask from blocking implementation signalsRich Felker2011-02-191-3/+5
| | | | | | this code was wrongly disabled because the old version was trying to be too clever and didn't work. replaced it with a simple version for now.
* make pthread_exit run dtors for last thread, wait to decrement thread countRich Felker2011-02-191-3/+3
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* make mktemp match the historic behavior, and update functions that use itRich Felker2011-02-193-5/+8
| | | | | | the historic mktemp is supposed to blank the template string on failure, rather than returning 0. just zero the first character so that mkstemp and mkdtemp can still retry with O(1) space requirement.
* fix major bug created from copying mkdtemp logicRich Felker2011-02-191-1/+1
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* add syscall wrappers for inotifyRich Felker2011-02-194-0/+28
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* cleanup cruft left from when kernel and user time_t disagreedRich Felker2011-02-192-12/+3
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* add pthread_atfork interfaceRich Felker2011-02-183-3/+55
| | | | | | | | | note that this presently does not handle consistency of the libc's own global state during forking. as per POSIX 2008, if the parent process was threaded, the child process may only call async-signal-safe functions until one of the exec-family functions is called, so the current behavior is believed to be conformant even if non-ideal. it may be improved at some later time.
* major improvements to temp file name generatorRich Felker2011-02-183-16/+21
| | | | | | | | use current time in nanoseconds and some potentially-random (if aslr is enabled) pointer values for the initial tempfile name generation, and step via a cheap linear prng on collisions. limit the number of retry attempts to prevent denial of service attacks even if an attacker can guess the filenames.
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