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* remove comment cruft that got left behind in x86_64 syscall.sRich Felker2011-03-191-1/+0
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* overhaul syscall interfaceRich Felker2011-03-196-13/+67
| | | | | | | | | | | | | | | this commit shuffles around the location of syscall definitions so that we can make a syscall() library function with both SYS_* and __NR_* style syscall names available to user applications, provides the syscall() library function, and optimizes the code that performs the actual inline syscalls in the library itself. previously on i386 when built as PIC (shared library), syscalls were incurring bus lock (lock prefix) overhead at entry and exit, due to the way the ebx register was being loaded (xchg instruction with a memory operand). now the xchg takes place between two registers. further cleanup to arch/$(ARCH)/syscall.h is planned.
* various legacy and linux-specific stuffRich Felker2011-03-181-0/+5
| | | | | this commit is part of an effort to make more of busybox work out-of-the-box.
* implement [v]swprintfRich Felker2011-03-183-1/+61
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* implement wprintf family of functionsRich Felker2011-03-174-0/+387
| | | | | | | | | this implementation is extremely ugly and inefficient, but it avoids a good deal of code duplication and bloat. it may be cleaned up later to eliminate the remaining code duplication and some of the warts, but i don't really care about its performance. note that swprintf is not yet implemented.
* fix broken wmemchr (unbounded search)Rich Felker2011-03-171-1/+1
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* implement robust mutexesRich Felker2011-03-179-10/+83
| | | | | | some of this code should be cleaned up, e.g. using macros for some of the bit flags, masks, etc. nonetheless, the code is believed to be working and correct at this point.
* avoid function call to pthread_self in mutex unlockRich Felker2011-03-171-1/+1
| | | | | | if the mutex was previously locked, we can assume pthread_self was already called at the time of locking, and thus that the thread pointer is initialized.
* reorder mutex struct fields to make room for pointers (upcoming robust mutexes)Rich Felker2011-03-171-1/+3
| | | | | | the layout has been chosen so that pointer slots 3 and 4 fit between the integer slots on 32-bit archs, and come after the integer slots on 64-bit archs.
* unify lock and owner fields of mutex structureRich Felker2011-03-174-8/+6
| | | | | | this change is necessary to free up one slot in the mutex structure so that we can use doubly-linked lists in the implementation of robust mutexes.
* optimize contended normal mutex case; add int compare-and-swap atomicRich Felker2011-03-171-1/+1
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* simplify logic, slightly optimize contended case for non-default mutex typesRich Felker2011-03-161-4/+2
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* correct error returns for error-checking mutexesRich Felker2011-03-162-2/+6
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* cut out a syscall on thread creation in the case where guard size is 0Rich Felker2011-03-161-1/+1
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* don't expose EAGAIN, etc. from timed futex wait to callerRich Felker2011-03-161-1/+4
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* optimize file locking: avoid cache-polluting writes to global storageRich Felker2011-03-162-3/+5
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* partially-written draft of fmemopen, still in #if 0Rich Felker2011-03-141-3/+48
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* misplaced & in times() made it fail to work, and clobber the stackRich Felker2011-03-121-1/+1
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* implement flockfile api, rework stdio lockingRich Felker2011-03-129-15/+66
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* implement dummy pthread_attr_[gs]etschedparam functionsRich Felker2011-03-112-0/+14
| | | | | | | | for some reason these functions are not shaded by the PS/TPS option in POSIX, so presumably they are mandatory, even though the functionality they offer is optional. for now, provide them in case any programs depend on their existence, but disallow any priority except the default.
* fix pthread_attr_* implementations to match corrected prototypesRich Felker2011-03-114-4/+4
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* fix failure behavior of sem_open when sem does not existRich Felker2011-03-101-1/+5
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* fix some semaphore wait semantics (race condition deadlock and error checking)Rich Felker2011-03-102-1/+7
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* fix sem_open and sem_close to obey posix semanticsRich Felker2011-03-103-38/+85
| | | | | | | | | multiple opens of the same named semaphore must return the same pointer, and only the last close can unmap it. thus the ugly global state keeping track of mappings. the maximum number of distinct named semaphores that can be opened is limited sufficiently small that the linear searches take trivial time, especially compared to the syscall overhead of these functions.
* optimize pthread termination in the non-detached caseRich Felker2011-03-102-4/+16
| | | | | | | we can avoid blocking signals by simply using a flag to mark that the thread has exited and prevent it from getting counted in the rsyscall signal-pingpong. this restores the original pthread create/join throughput from before the sigprocmask call was added.
* fix errors in sigqueue (potential information leak, wrong behavior)Rich Felker2011-03-101-5/+7
| | | | | | | | 1. any padding in the siginfo struct was not necessarily zero-filled, so it might have contained private data off the caller's stack. 2. the uid and pid must be filled in from userspace. the previous rsyscall fix broke rsyscalls because the values were always incorrect.
* security fix: check that cancel/rsyscall signal was sent by the process itselfRich Felker2011-03-101-0/+3
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* more cancellation points: tcdrain, clock_nanosleepRich Felker2011-03-102-2/+12
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* remove useless return value checks for functions that cannot failRich Felker2011-03-101-3/+2
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* make sigsuspend a cancellation pointRich Felker2011-03-101-1/+6
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* make sigtimedwait a cancellation pointRich Felker2011-03-101-0/+3
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* don't fail with EINTR in sigtimedwaitRich Felker2011-03-101-6/+6
| | | | | POSIX allows either behavior, but sigwait is not allowed to fail with EINTR, so the retry loop would have to be in one or the other anyway.
* fix sigsuspend syscallRich Felker2011-03-101-1/+1
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* make sigaltstack work (missing macros in signal.h, error conditions)Rich Felker2011-03-101-1/+11
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* fix errno behavior in clock_* functionsRich Felker2011-03-103-3/+0
| | | | | | these functions are specified inconsistent in whether they're specified to return an error value, or return -1 and set errno. hopefully now they all match what POSIX requires.
* fix error handling for pthread_sigmaskRich Felker2011-03-092-1/+15
| | | | it must return errno, not -1, and should reject invalud values for how.
* make fork properly initialize the main thread in the child processRich Felker2011-03-091-0/+7
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* optimize pthread initializationRich Felker2011-03-091-2/+2
| | | | | | the set_tid_address returns the tid (which is also the pid when called from the initial thread) so there is no need to make a separate syscall to get pid/tid.
* 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.
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