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* fix prototype for strsepRich Felker2011-04-061-0/+1
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* fix completely bogus loop condition in getmntent_rRich Felker2011-04-061-1/+1
| | | | | somehow this worked on my simple fstab, but horribly broke in general, leading to use of uninitialized offset array and crashes.
* major semaphore improvements (performance and correctness)Rich Felker2011-04-065-21/+37
| | | | | 1. make sem_[timed]wait interruptible by signals, per POSIX 2. keep a waiter count in order to avoid unnecessary futex wake syscalls
* fix signal-based timers with null sigevent argumentRich Felker2011-04-065-28/+19
| | | | | | | | | | | | | since timer_create is no longer allocating a structure for the timer_t and simply using the kernel timer id, it was impossible to specify the timer_t as the argument to the signal handler. the solution is to pass the null sigevent pointer on to the kernel, rather than filling it in userspace, so that the kernel does the right thing. however, that precludes the clever timerid-versus-threadid encoding we were doing. instead, just assume timerids are below 1M and thread pointers are above 1M. (in perspective: timerids are sequentially allocated and seem limited to 32k, and thread pointers are at roughly 3G.)
* fix incorrect (and conflicting on LP64 archs) types for sysv ipc msgq functionsRich Felker2011-04-061-1/+1
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* fix (hopefully) statvfs breakage on x86_64 that resulted from fixing i386...Rich Felker2011-04-052-2/+10
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* new framework to inhibit thread cancellation when neededRich Felker2011-04-053-5/+17
| | | | | | | with these small changes, libc functions which need to call functions which are cancellation points, but which themselves must not be cancellation points, can use the CANCELPT_INHIBIT and CANCELPT_RESUME macros to temporarily inhibit all cancellation.
* add sysv ipc message queues (completely untested)Rich Felker2011-04-054-0/+58
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* implement the adjtime and adjtimex functions (nonstandard)Rich Felker2011-04-052-0/+34
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* add getmntent_r interface (all of mntent is nonstandard anyway)Rich Felker2011-04-051-12/+17
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* implement if_indextoname and if_nametoindex functionsRich Felker2011-04-052-0/+36
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* add (nonstandard) cfmakeraw functionRich Felker2011-04-051-0/+12
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* add pivot_root syscall wrapperRich Felker2011-04-051-0/+6
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* add more legacy functions: setlinebuf and setbufferRich Felker2011-04-053-1/+15
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* support the nonstandard err.h interfacesRich Felker2011-04-051-0/+60
| | | | | | note that unlike the originals, these do not print the program name/argv[0] because we have not saved it anywhere. this could be changed in __libc_start_main if desired.
* fix misaligned read on early string termination in strchrRich Felker2011-04-051-1/+2
| | | | | | this could actually cause rare crashes in the case where a short string is located at the end of a page and the following page is not readable, and in fact this was seen in gcc compiling certain files.
* fix overflow in printf %N$ argument handlingRich Felker2011-04-051-2/+2
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* fix various floating point rounding and formatting errors in *printfRich Felker2011-04-051-17/+25
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* fix rare but nasty under-allocation bug in malloc with large requestsRich Felker2011-04-041-1/+1
| | | | | | | | | the bug appeared only with requests roughly 2*sizeof(size_t) to 4*sizeof(size_t) bytes smaller than a multiple of the page size, and only for requests large enough to be serviced by mmap instead of the normal heap. it was only ever observed on 64-bit machines but presumably could also affect 32-bit (albeit with a smaller window of opportunity).
* simplify vdprintf implementation greatly based on recent vfprintf changesRich Felker2011-04-041-5/+2
| | | | | | | since vfprintf will provide a temporary buffer in the case where the target FILE has a zero buffer size, don't bother setting up a real buffer for vdprintf. this also allows us to skip the call to fflush since we know everything will be written out before vfprintf returns.
* use a local temp buffer for unbuffered streams in vfprintfRich Felker2011-04-042-0/+14
| | | | | | | | | this change makes it so most calls to fprintf(stderr, ...) will result in a single writev syscall, as opposed to roughly 2*N syscalls (and possibly more) where N is the number of format specifiers. in principle we could use a much larger buffer, but it's best not to increase the stack requirements too much. most messages are under 80 chars.
* fix nl_langinfo to actually use the existing, correct internal versionRich Felker2011-04-032-15/+5
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* make ualarm actually work (obsolete function removed from SUS)Rich Felker2011-04-031-4/+9
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* fix various bugs in strtold:Rich Felker2011-04-031-10/+13
| | | | | | | | | | | 0e10000000000000000000000000000000 was setting ERANGE exponent char e/p was considered part of the match even if not followed by a valid decimal value "1e +10" was parsed as "1e+10" hex digits were misinterpreted as 0..5 instead of 10..15
* fix serious bug in strchr - char signednessRich Felker2011-04-031-9/+11
| | | | | | search for bytes with high bit set was giving (potentially dangerous) wrong results. i've tested, cleaned up, and hopefully sped up this function now.
* add setresuid/setresgid functions (nonstandard)Rich Felker2011-04-032-0/+20
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* pthread_create need not set errnoRich Felker2011-04-031-1/+1
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* fix statvfs syscalls (missing size argument)Rich Felker2011-04-032-2/+2
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* block all signals during rsyscallRich Felker2011-04-031-4/+9
| | | | | otherwise a signal handler could see an inconsistent and nonconformant program state where different threads have different uids/gids.
* fix race condition in rsyscall handlerRich Felker2011-04-031-1/+1
| | | | | | | | | | | | | | | | | | the problem: there is a (single-instruction) race condition window between a thread flagging itself dead and decrementing itself from the thread count. if it receives the rsyscall signal at this exact moment, the rsyscall caller will never succeed in signalling enough flags to succeed, and will deadlock forever. in previous versions of musl, the about-to-terminate thread masked all signals prior to decrementing the thread count, but this cost a whole syscall just to account for extremely rare races. the solution is a huge hack: rather than blocking in the signal handler if the thread is dead, modify the signal mask of the saved context and return in order to prevent further signal handling by the dead thread. this allows the dead thread to continue decrementing the thread count (if it had not yet done so) and exiting, even while the live part of the program blocks for rsyscall.
* don't trust siginfo in rsyscall handlerRich Felker2011-04-031-3/+2
| | | | | | | | for some inexplicable reason, linux allows the sender of realtime signals to spoof its identity. permission checks for sending signals should limit the impact to same-user processes, but just to be safe, we avoid trusting the siginfo structure and instead simply examine the program state to see if we're in the middle of a legitimate rsyscall.
* timer threads should sleep and stay asleep... a long timeRich Felker2011-04-031-1/+1
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* revert to deleting kernel-level timer from cancellation handlerRich Felker2011-04-032-7/+11
| | | | | this is necessary in order to avoid breaking timer_getoverrun in the last run of the timer event handler, if it has not yet finished.
* simplify calling of timer signal handlerRich Felker2011-04-033-12/+6
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* simplify pthread tsd key handlingRich Felker2011-04-033-10/+7
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* omit pthread tsd dtor code if tsd is not usedRich Felker2011-04-032-14/+24
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* don't disable seeking after first seek failureRich Felker2011-04-021-8/+0
| | | | | this could cause problems if the application uses dup2(fd,fileno(f)) to redirect, and the old fd was not seekable but the new fd is.
* apparently fseek should not set the error flag on failed seekRich Felker2011-04-021-4/+1
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* avoid over-allocation of brk on first mallocRich Felker2011-04-011-4/+4
| | | | | | | if init_malloc returns positive (successful first init), malloc will retry getting a chunk from the free bins rather than expanding the heap again. also pass init_malloc a hint for the size of the initial allocation.
* reorganize the __libc structure for threaded performance issuesRich Felker2011-04-011-6/+6
| | | | | | | we want to keep atomically updated fields (locks and thread count) and really anything writable far away from frequently-needed function pointers. stuff some rarely-needed function pointers in between to pad, hopefully up to a cache line boundary.
* simplify setting result on thread cancellationRich Felker2011-04-011-1/+1
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* use bss instead of mmap for main thread's pthread thread-specific dataRich Felker2011-04-012-9/+4
| | | | this simplifies code and removes a failure case
* remove obsolete and useless useconds_t typeRich Felker2011-04-012-2/+2
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* fix misspelled PTHREAD_CANCELED constantRich Felker2011-04-011-1/+1
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* use a_store to set cancel flag in pthread_cancel, to ensure a barrierRich Felker2011-04-011-1/+1
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* simplify pthread_key_deleteRich Felker2011-03-311-1/+1
| | | | | calling this function on an uninitialized key value is UB, so there is no need to check that the table pointer was initialized.
* greatly simplify pthread_key_create (~20% size reduction)Rich Felker2011-03-311-10/+9
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* avoid all malloc/free in timer creation/destructionRich Felker2011-03-305-29/+20
| | | | | | | | | | instead of allocating a userspace structure for signal-based timers, simply use the kernel timer id. we use the fact that thread pointers will always be zero in the low bit (actually more) to encode integer timerid values as pointers. also, this change ensures that the timer_destroy syscall has completed before the library timer_destroy function returns, in case it matters.
* optimize timer creation and possibly protect against some minor racesRich Felker2011-03-302-16/+19
| | | | | | | | | the major idea of this patch is not to depend on having the timer pointer delivered to the signal handler, and instead use the thread pointer to get the callback function address and argument. this way, the parent thread can make the timer_create syscall while the child thread is starting, and it should never have to block waiting for the barrier.
* avoid crash on stupid but allowable usage of pthread_mutex_unlockRich Felker2011-03-301-1/+3
| | | | | | | unlocking an unlocked mutex is not UB for robust or error-checking mutexes, so we must avoid calling __pthread_self (which might crash due to lack of thread-register initialization) until after checking that the mutex is locked.