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2011-05-07optimize compound-literal sigset_t's not to contain useless hurd bitsRich Felker-5/+7
2011-05-07overhaul implementation-internal signal protectionsRich Felker-50/+32
the new approach relies on the fact that the only ways to create sigset_t objects without invoking UB are to use the sig*set() functions, or from the masks returned by sigprocmask, sigaction, etc. or in the ucontext_t argument to a signal handler. thus, as long as sigfillset and sigaddset avoid adding the "protected" signals, there is no way the application will ever obtain a sigset_t including these bits, and thus no need to add the overhead of checking/clearing them when sigprocmask or sigaction is called. note that the old code actually *failed* to remove the bits from sa_mask when sigaction was called. the new implementations are also significantly smaller, simpler, and faster due to ignoring the useless "GNU HURD signals" 65-1024, which are not used and, if there's any sanity in the world, never will be used.
2011-05-06reduce some ridiculously large spin countsRich Felker-2/+2
these should be tweaked according to testing. offhand i know 1000 is too low and 5000 is likely to be sufficiently high. consider trying to add futexes to file locking, too...
2011-05-06remove debug code that was missed in barrier commitRich Felker-1/+0
2011-05-06completely new barrier implementation, addressing major correctness issuesRich Felker-20/+48
the previous implementation had at least 2 problems: 1. the case where additional threads reached the barrier before the first wave was finished leaving the barrier was untested and seemed not to be working. 2. threads leaving the barrier continued to access memory within the barrier object after other threads had successfully returned from pthread_barrier_wait. this could lead to memory corruption or crashes if the barrier object had automatic storage in one of the waiting threads and went out of scope before all threads finished returning, or if one thread unmapped the memory in which the barrier object lived. the new implementation avoids both problems by making the barrier state essentially local to the first thread which enters the barrier wait, and forces that thread to be the last to return.
2011-05-05add SA_NOMASK alias for SA_NODEFER with _GNU_SOURCERich Felker-0/+1
2011-05-02fix fclose return status logic, againRich Felker-1/+2
the previous fix was incorrect, as it would prevent f->close(f) from being called if fflush(f) failed. i believe this was the original motivation for using | rather than ||. so now let's just use a second statement to constrain the order of function calls, and to back to using |.
2011-05-01fix undefined call order in fclose, possible lost output depending on compilerRich Felker-1/+1
pcc turned up this bug by calling f->close(f) before fflush(f), resulting in lost output and error on flush.
2011-05-01workaround for preprocessor bug in pccRich Felker-7/+7
with this patch, musl compiles and mostly works with pcc 1.0.0. a few tests are still failing and i'm uncertain whether they are due to portability problems in musl, or bugs in pcc, but i suspect the latter.
2011-05-01minor optimization in puts: use inline putc_unlocked macro for newlineRich Felker-1/+1
2011-04-29avoid crashing when nel==0 is passed to qsortRich Felker-2/+6
2011-04-27use compiler builtins for variadic macros when availableRich Felker-1/+12
this slightly cuts down on the degree musl "fights with" gcc, but more importantly, it fixes a critical bug when gcc inlines a variadic function and optimizes out the variadic arguments due to noticing that they were "not used" (by __builtin_va_arg). we leave the old code in place if __GNUC__ >= 3 is false; it seems like it might be necessary at least for tinycc support and perhaps if anyone ever gets around to fixing gcc 2.95.3 enough to make it work..
2011-04-27correct variadic prototypes for execl* familyRich Felker-18/+21
the old versions worked, but conflicted with programs which declared their own prototypes and generated warnings with some versions of gcc.
2011-04-27replace heap sort with smoothsort implementation by Valentin OchsRich Felker-32/+197
Smoothsort is an adaptive variant of heapsort. This version was written by Valentin Ochs (apo) specifically for inclusion in musl. I worked with him to get it working in O(1) memory usage even with giant array element widths, and to optimize it heavily for size and speed. It's still roughly 4 times as large as the old heap sort implementation, but roughly 20 times faster given an almost-sorted array of 1M elements (20 being the base-2 log of 1M), i.e. it really does reduce O(n log n) to O(n) in the mostly-sorted case. It's still somewhat slower than glibc's Introsort for random input, but now considerably faster than glibc when the input is already sorted, or mostly sorted.
2011-04-27add word-sized ctz function to atomic.hRich Felker-4/+16
strictly speaking this and a few other ops should be factored into asm.h or the file should just be renamed to asm.h, but whatever. clean it up someday.
2011-04-26function signature fix: add const qualifier to mempcpy src argRich Felker-2/+2
2011-04-26typo in prototype for mempcpyRich Felker-1/+1
2011-04-26prototype for mempcpyRich Felker-0/+1
2011-04-25fix bug in ipv6 parsing that prevented parsing a lone "::"Rich Felker-4/+1
2011-04-25ipv6 parsing code (formerly dummied-out)Rich Felker-8/+62
2011-04-25fix 2 eof-related bugs in scanfRich Felker-3/+4
1. failed match of literal chars from the format string would always return matching failure rather than input failure at eof, leading to infinite loops in some programs. 2. unread of eof would wrongly adjust the character counts reported by %n, yielding an off-by-one error.
2011-04-22update release notes to new format, add morev0.7.9Rich Felker-23/+33
2011-04-22fix initial stack alignment in new threads on x86_64Rich Felker-1/+1
2011-04-21update release notes in prep for 0.7.9 releaseRich Felker-3/+12
2011-04-21omit errno update path for syscalls that cannot failRich Felker-7/+7
2011-04-21fix bogus return values for inet_ptonRich Felker-2/+2
2011-04-21move wait.h macros out of bits. they do not vary.Rich Felker-49/+30
2011-04-21include signal.h to avoid thorny __sigcontext/sigcontext issuesRich Felker-2/+2
this is explicitly allowed by POSIX
2011-04-20fix minor bugs due to incorrect threaded-predicate semanticsRich Felker-6/+6
some functions that should have been testing whether pthread_self() had been called and initialized the thread pointer were instead testing whether pthread_create() had been called and actually made the program "threaded". while it's unlikely any mismatch would occur in real-world problems, this could have introduced subtle bugs. now, we store the address of the main thread's thread descriptor in the libc structure and use its presence as a flag that the thread register is initialized. note that after fork, the calling thread (not necessarily the original main thread) is the new main thread.
2011-04-20workaround bug in linux dup2Rich Felker-1/+4
the linux documentation for dup2 says it can fail with EBUSY due to a race condition with open and dup in the kernel. shield applications (and the rest of libc) from this nonsense by looping until it succeeds
2011-04-20properly create new session/controlling terminal in forkptyRich Felker-1/+4
2011-04-20implement (nonstandard) forkptyRich Felker-0/+23
2011-04-20disallow blank strings as service or host nameRich Felker-0/+3
2011-04-20fix bugs in ipv4 parsingRich Felker-1/+2
2011-04-20fix initgroups (uninitialized count passed to getgrouplist)Rich Felker-1/+1
2011-04-20shadow password fixes: empty fields should read as -1 not 0Rich Felker-7/+13
2011-04-20namespace fixes for sys/mman.hRich Felker-30/+31
2011-04-20fix missing include in posix_madvise.c (compile error)Rich Felker-0/+1
2011-04-20support posix_madvise (previous a stub)Rich Felker-1/+3
the check against MADV_DONTNEED to because linux MADV_DONTNEED semantics conflict dangerously with the POSIX semantics
2011-04-20add syscall wrappers for posix_fadvise, posix_fallocateRich Felker-0/+22
2011-04-19block cancellation in wordexp, handle more errorsRich Felker-2/+17
2011-04-19avoid malloc of potentially-large string in wordexpRich Felker-10/+28
2011-04-19move some more code out of pthread_create.cRich Felker-7/+4
this also de-uglifies the dummy function aliasing a bit.
2011-04-19fix uninitialized waiters field in semaphoresRich Felker-0/+1
2011-04-18dns lookups: protect against cancellation and fix incorrect error codesRich Felker-4/+10
2011-04-18avoid fd leak if opendir is cancelled when calloc has failedRich Felker-1/+2
2011-04-18protect ftw and nftw against cancellationRich Felker-1/+6
2011-04-18protect syslog against cancellationRich Felker-5/+19
these functions are allowed to be cancellation points, but then we would have to install cleanup handlers to avoid termination with locks held.
2011-04-18recheck cancellation disabled flag after syscall returns EINTRRich Felker-1/+1
we already checked before making the syscall, but it's possible that a signal handler interrupted the blocking syscall and disabled cancellation, and that this is the cause of EINTR. in this case, the old behavior was testably wrong.
2011-04-18remove bogus extra logic for close cancellabilityRich Felker-3/+1
like all other syscalls, close should return to the caller if and only if it successfully performed its action. it is necessary that the application be able to determine whether the close succeeded.