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2011-04-05add more legacy functions: setlinebuf and setbufferRich Felker-1/+17
2011-04-05alternate name for syslog.hRich Felker-0/+1
2011-04-05uncomment IP_PKTINFORich Felker-2/+2
this was a hack leftover from testing before the initial check-in to git.
2011-04-05support the nonstandard err.h interfacesRich Felker-0/+84
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.
2011-04-05release notes for next bugfix releaseRich Felker-0/+14
2011-04-05fix misaligned read on early string termination in strchrRich Felker-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.
2011-04-05fix overflow in printf %N$ argument handlingRich Felker-2/+2
2011-04-05fix various floating point rounding and formatting errors in *printfRich Felker-17/+25
2011-04-04release notes for 0.7.6 bugfix releasev0.7.6Rich Felker-0/+24
2011-04-04fix rare but nasty under-allocation bug in malloc with large requestsRich Felker-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).
2011-04-04simplify vdprintf implementation greatly based on recent vfprintf changesRich Felker-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.
2011-04-04use a local temp buffer for unbuffered streams in vfprintfRich Felker-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.
2011-04-03fix nl_langinfo to actually use the existing, correct internal versionRich Felker-15/+5
2011-04-03make ualarm actually work (obsolete function removed from SUS)Rich Felker-4/+9
2011-04-03fix various bugs in strtold:Rich Felker-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
2011-04-03fix serious bug in strchr - char signednessRich Felker-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.
2011-04-03prototype getdtablesize (nonstandard function)Rich Felker-0/+1
2011-04-03add setresuid/setresgid functions (nonstandard)Rich Felker-0/+22
2011-04-03pthread_create need not set errnoRich Felker-1/+1
2011-04-03fix statvfs syscalls (missing size argument)Rich Felker-3/+3
2011-04-03block all signals during rsyscallRich Felker-4/+9
otherwise a signal handler could see an inconsistent and nonconformant program state where different threads have different uids/gids.
2011-04-03fix race condition in rsyscall handlerRich Felker-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.
2011-04-03don't trust siginfo in rsyscall handlerRich Felker-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.
2011-04-03timer threads should sleep and stay asleep... a long timeRich Felker-1/+1
2011-04-03revert to deleting kernel-level timer from cancellation handlerRich Felker-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.
2011-04-03simplify calling of timer signal handlerRich Felker-12/+6
2011-04-03d_fileno alias for d_ino in direntRich Felker-0/+2
this is nonstandard but since POSIX reserved d_ prefix in dirent.h we might as well define it unconditionally. some programs depend on it.
2011-04-03simplify pthread tsd key handlingRich Felker-10/+7
2011-04-03omit pthread tsd dtor code if tsd is not usedRich Felker-14/+24
2011-04-02don't disable seeking after first seek failureRich Felker-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.
2011-04-02apparently fseek should not set the error flag on failed seekRich Felker-4/+1
2011-04-01update release notesv0.7.5Rich Felker-1/+2
2011-04-01avoid over-allocation of brk on first mallocRich Felker-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.
2011-04-01reorganize the __libc structure for threaded performance issuesRich Felker-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.
2011-04-01simplify setting result on thread cancellationRich Felker-1/+1
2011-04-01use bss instead of mmap for main thread's pthread thread-specific dataRich Felker-9/+4
this simplifies code and removes a failure case
2011-04-01remove obsolete and useless useconds_t typeRich Felker-7/+4
2011-04-01somehow timespec tv_nsec had the wrong type on x86_64... fixedRich Felker-1/+1
2011-04-01fix misspelled PTHREAD_CANCELED constantRich Felker-2/+2
2011-04-01document more changesRich Felker-0/+6
2011-04-01document changes for upcoming 0.7.5 releaseRich Felker-0/+19
2011-04-01use a_store to set cancel flag in pthread_cancel, to ensure a barrierRich Felker-1/+1
2011-03-31simplify pthread_key_deleteRich Felker-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.
2011-03-31greatly simplify pthread_key_create (~20% size reduction)Rich Felker-10/+9
2011-03-30add some missing prototypes for nonstandard functions (strsep, clearenv)Rich Felker-0/+2
2011-03-30avoid all malloc/free in timer creation/destructionRich Felker-31/+22
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.
2011-03-30optimize timer creation and possibly protect against some minor racesRich Felker-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.
2011-03-30avoid crash on stupid but allowable usage of pthread_mutex_unlockRich Felker-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.
2011-03-30rename __simple_malloc.c to lite_malloc.c - yes this affects behavior!Rich Felker-0/+0
why does this affect behavior? well, the linker seems to traverse archive files starting from its current position when resolving symbols. since calloc.c comes alphabetically (and thus in sequence in the archive file) between __simple_malloc.c and malloc.c, attempts to resolve the "malloc" symbol for use by calloc.c were pulling in the full malloc.c implementation rather than the __simple_malloc.c implementation. as of now, lite_malloc.c and malloc.c are adjacent in the archive and in the correct order, so malloc.c should never be used to resolve "malloc" unless it's already needed to resolve another symbol ("free" or "realloc").
2011-03-30streamline mutex unlock to remove a useless branch, use a_store to unlockRich Felker-2/+6
this roughly halves the cost of pthread_mutex_unlock, at least for non-robust, normal-type mutexes. the a_store change is in preparation for future support of archs which require a memory barrier or special atomic store operation, and also should prevent the possibility of the compiler misordering writes.