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Rich Felker [Fri, 8 Apr 2011 13:21:51 +0000 (09:21 -0400)]
fix ipv6 address printing: 2001 appeared as 201, etc.
Rich Felker [Fri, 8 Apr 2011 12:49:28 +0000 (08:49 -0400)]
fix broken dns response parsing code that made most ipv6 lookups fail
Rich Felker [Fri, 8 Apr 2011 12:14:28 +0000 (08:14 -0400)]
return the requested string as the "canonical name" for numeric addresses
previously NULL was returned in ai_canonname, resulting in crashes in
some callers. this behavior was incorrect. note however that the new
behavior differs from glibc, which performs reverse dns lookups. POSIX
is very clear that a reverse DNS lookup must not be performed for
numeric addresses.
Rich Felker [Fri, 8 Apr 2011 03:18:12 +0000 (23:18 -0400)]
fix uninitialized variables in dns lookup code
Rich Felker [Fri, 8 Apr 2011 03:13:47 +0000 (23:13 -0400)]
fix bug in TRE found by clang (typo && instead of &)
Rich Felker [Thu, 7 Apr 2011 20:19:30 +0000 (16:19 -0400)]
fix misplaced *'s in string functions (harmless)
Rich Felker [Thu, 7 Apr 2011 20:13:47 +0000 (16:13 -0400)]
fix broken unsigned comparison in wcstoumax
Rich Felker [Thu, 7 Apr 2011 20:10:44 +0000 (16:10 -0400)]
fix breakage due to converting a return type to size_t in iconv...
Rich Felker [Thu, 7 Apr 2011 00:43:39 +0000 (20:43 -0400)]
fixed crash in new rsyscall (failure to set sa_flags for signal handler)
Rich Felker [Thu, 7 Apr 2011 00:32:53 +0000 (20:32 -0400)]
consistency: change all remaining syscalls to use SYS_ rather than __NR_ prefix
Rich Felker [Thu, 7 Apr 2011 00:27:07 +0000 (20:27 -0400)]
move rsyscall out of pthread_create module
this is something of a tradeoff, as now set*id() functions, rather
than pthread_create, are what pull in the code overhead for dealing
with linux's refusal to implement proper POSIX thread-vs-process
semantics. my motivations are:
1. it's cleaner this way, especially cleaner to optimize out the
rsyscall locking overhead from pthread_create when it's not needed.
2. it's expected that only a tiny number of core system programs will
ever use set*id() functions, whereas many programs may want to use
threads, and making thread overhead tiny is an incentive for "light"
programs to try threads.
Rich Felker [Wed, 6 Apr 2011 23:47:50 +0000 (19:47 -0400)]
pthread exit stuff: don't bother setting errno when we won't check it.
Rich Felker [Wed, 6 Apr 2011 23:46:46 +0000 (19:46 -0400)]
fix rsyscall handler: must not clobber errno from signal context
Rich Felker [Wed, 6 Apr 2011 21:50:38 +0000 (17:50 -0400)]
fix typo in sys/msg.h
Rich Felker [Wed, 6 Apr 2011 20:40:19 +0000 (16:40 -0400)]
add startup abi functions, dummy for now. eventually needed for c++ support.
Rich Felker [Wed, 6 Apr 2011 19:47:26 +0000 (15:47 -0400)]
add _res (__res_state()) dummy
Rich Felker [Wed, 6 Apr 2011 19:44:39 +0000 (15:44 -0400)]
add IN_LOOPBACKNET constant (nonstandard but in reserved namespace)
Rich Felker [Wed, 6 Apr 2011 18:46:37 +0000 (14:46 -0400)]
document more changes for 0.7.7
Rich Felker [Wed, 6 Apr 2011 18:28:29 +0000 (14:28 -0400)]
fix prototype for strsep
Rich Felker [Wed, 6 Apr 2011 16:35:05 +0000 (12:35 -0400)]
fix completely bogus loop condition in getmntent_r
somehow this worked on my simple fstab, but horribly broke in general,
leading to use of uninitialized offset array and crashes.
Rich Felker [Wed, 6 Apr 2011 16:24:34 +0000 (12:24 -0400)]
major semaphore improvements (performance and correctness)
1. make sem_[timed]wait interruptible by signals, per POSIX
2. keep a waiter count in order to avoid unnecessary futex wake syscalls
Rich Felker [Wed, 6 Apr 2011 13:26:41 +0000 (09:26 -0400)]
fix signal-based timers with null sigevent argument
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.)
Rich Felker [Wed, 6 Apr 2011 04:02:20 +0000 (00:02 -0400)]
fix incorrect (and conflicting on LP64 archs) types for sysv ipc msgq functions
Rich Felker [Wed, 6 Apr 2011 03:58:36 +0000 (23:58 -0400)]
fix (hopefully) statvfs breakage on x86_64 that resulted from fixing i386...
Rich Felker [Tue, 5 Apr 2011 22:58:47 +0000 (18:58 -0400)]
document more changes
Rich Felker [Tue, 5 Apr 2011 22:00:28 +0000 (18:00 -0400)]
new framework to inhibit thread cancellation when needed
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.
Rich Felker [Tue, 5 Apr 2011 21:27:28 +0000 (17:27 -0400)]
add ip6 pktinfo stuff for x86_64
these defs should probably all be moved out of bits and unified...
Rich Felker [Tue, 5 Apr 2011 20:33:55 +0000 (16:33 -0400)]
add sysv ipc message queues (completely untested)
Rich Felker [Tue, 5 Apr 2011 19:45:24 +0000 (15:45 -0400)]
getopt.h is a GNU-getopt-specific header. always expose GNU functions.
Rich Felker [Tue, 5 Apr 2011 19:40:36 +0000 (15:40 -0400)]
add sysexits.h legacy header
Rich Felker [Tue, 5 Apr 2011 19:38:20 +0000 (15:38 -0400)]
implement the adjtime and adjtimex functions (nonstandard)
Rich Felker [Tue, 5 Apr 2011 18:11:14 +0000 (14:11 -0400)]
add getmntent_r interface (all of mntent is nonstandard anyway)
Rich Felker [Tue, 5 Apr 2011 18:05:11 +0000 (14:05 -0400)]
add some missing ipv6 stuff
Rich Felker [Tue, 5 Apr 2011 17:20:08 +0000 (13:20 -0400)]
implement if_indextoname and if_nametoindex functions
Rich Felker [Tue, 5 Apr 2011 16:35:09 +0000 (12:35 -0400)]
add (nonstandard) cfmakeraw function
Rich Felker [Tue, 5 Apr 2011 16:32:10 +0000 (12:32 -0400)]
add pivot_root syscall wrapper
Rich Felker [Tue, 5 Apr 2011 16:25:31 +0000 (12:25 -0400)]
add more legacy functions: setlinebuf and setbuffer
Rich Felker [Tue, 5 Apr 2011 16:13:54 +0000 (12:13 -0400)]
alternate name for syslog.h
Rich Felker [Tue, 5 Apr 2011 16:07:42 +0000 (12:07 -0400)]
uncomment IP_PKTINFO
this was a hack leftover from testing before the initial
check-in to git.
Rich Felker [Tue, 5 Apr 2011 15:16:49 +0000 (11:16 -0400)]
support the nonstandard err.h interfaces
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.
Rich Felker [Tue, 5 Apr 2011 14:28:08 +0000 (10:28 -0400)]
release notes for next bugfix release
Rich Felker [Tue, 5 Apr 2011 13:27:41 +0000 (09:27 -0400)]
fix misaligned read on early string termination in strchr
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.
Rich Felker [Tue, 5 Apr 2011 13:24:03 +0000 (09:24 -0400)]
fix overflow in printf %N$ argument handling
Rich Felker [Tue, 5 Apr 2011 13:16:40 +0000 (09:16 -0400)]
fix various floating point rounding and formatting errors in *printf
Rich Felker [Mon, 4 Apr 2011 22:00:02 +0000 (18:00 -0400)]
release notes for 0.7.6 bugfix release
Rich Felker [Mon, 4 Apr 2011 21:26:41 +0000 (17:26 -0400)]
fix rare but nasty under-allocation bug in malloc with large requests
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).
Rich Felker [Mon, 4 Apr 2011 20:30:39 +0000 (16:30 -0400)]
simplify vdprintf implementation greatly based on recent vfprintf changes
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.
Rich Felker [Mon, 4 Apr 2011 20:24:49 +0000 (16:24 -0400)]
use a local temp buffer for unbuffered streams in vfprintf
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.
Rich Felker [Sun, 3 Apr 2011 23:51:14 +0000 (19:51 -0400)]
fix nl_langinfo to actually use the existing, correct internal version
Rich Felker [Sun, 3 Apr 2011 23:18:43 +0000 (19:18 -0400)]
make ualarm actually work (obsolete function removed from SUS)
Rich Felker [Sun, 3 Apr 2011 22:44:37 +0000 (18:44 -0400)]
fix various bugs in strtold:
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
Rich Felker [Sun, 3 Apr 2011 22:16:11 +0000 (18:16 -0400)]
fix serious bug in strchr - char signedness
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.
Rich Felker [Sun, 3 Apr 2011 22:15:36 +0000 (18:15 -0400)]
prototype getdtablesize (nonstandard function)
Rich Felker [Sun, 3 Apr 2011 20:20:57 +0000 (16:20 -0400)]
add setresuid/setresgid functions (nonstandard)
Rich Felker [Sun, 3 Apr 2011 20:15:15 +0000 (16:15 -0400)]
pthread_create need not set errno
Rich Felker [Sun, 3 Apr 2011 19:42:31 +0000 (15:42 -0400)]
fix statvfs syscalls (missing size argument)
Rich Felker [Sun, 3 Apr 2011 17:15:42 +0000 (13:15 -0400)]
block all signals during rsyscall
otherwise a signal handler could see an inconsistent and nonconformant
program state where different threads have different uids/gids.
Rich Felker [Sun, 3 Apr 2011 17:03:18 +0000 (13:03 -0400)]
fix race condition in rsyscall handler
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.
Rich Felker [Sun, 3 Apr 2011 16:20:51 +0000 (12:20 -0400)]
don't trust siginfo in rsyscall handler
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.
Rich Felker [Sun, 3 Apr 2011 16:10:24 +0000 (12:10 -0400)]
timer threads should sleep and stay asleep... a long time
Rich Felker [Sun, 3 Apr 2011 16:08:34 +0000 (12:08 -0400)]
revert to deleting kernel-level timer from cancellation handler
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.
Rich Felker [Sun, 3 Apr 2011 16:03:58 +0000 (12:03 -0400)]
simplify calling of timer signal handler
Rich Felker [Sun, 3 Apr 2011 14:24:59 +0000 (10:24 -0400)]
d_fileno alias for d_ino in dirent
this is nonstandard but since POSIX reserved d_ prefix in dirent.h we
might as well define it unconditionally. some programs depend on it.
Rich Felker [Sun, 3 Apr 2011 06:40:18 +0000 (02:40 -0400)]
simplify pthread tsd key handling
Rich Felker [Sun, 3 Apr 2011 06:33:50 +0000 (02:33 -0400)]
omit pthread tsd dtor code if tsd is not used
Rich Felker [Sat, 2 Apr 2011 17:55:54 +0000 (13:55 -0400)]
don't disable seeking after first seek failure
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.
Rich Felker [Sat, 2 Apr 2011 17:54:55 +0000 (13:54 -0400)]
apparently fseek should not set the error flag on failed seek
Rich Felker [Sat, 2 Apr 2011 03:15:29 +0000 (23:15 -0400)]
update release notes
Rich Felker [Sat, 2 Apr 2011 03:07:03 +0000 (23:07 -0400)]
avoid over-allocation of brk on first malloc
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.
Rich Felker [Sat, 2 Apr 2011 02:35:20 +0000 (22:35 -0400)]
reorganize the __libc structure for threaded performance issues
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.
Rich Felker [Sat, 2 Apr 2011 02:15:03 +0000 (22:15 -0400)]
simplify setting result on thread cancellation
Rich Felker [Sat, 2 Apr 2011 02:07:59 +0000 (22:07 -0400)]
use bss instead of mmap for main thread's pthread thread-specific data
this simplifies code and removes a failure case
Rich Felker [Sat, 2 Apr 2011 01:10:01 +0000 (21:10 -0400)]
remove obsolete and useless useconds_t type
Rich Felker [Sat, 2 Apr 2011 00:58:40 +0000 (20:58 -0400)]
somehow timespec tv_nsec had the wrong type on x86_64... fixed
Rich Felker [Sat, 2 Apr 2011 00:48:02 +0000 (20:48 -0400)]
fix misspelled PTHREAD_CANCELED constant
Rich Felker [Sat, 2 Apr 2011 00:47:54 +0000 (20:47 -0400)]
document more changes
Rich Felker [Sat, 2 Apr 2011 00:36:01 +0000 (20:36 -0400)]
document changes for upcoming 0.7.5 release
Rich Felker [Fri, 1 Apr 2011 23:53:16 +0000 (19:53 -0400)]
use a_store to set cancel flag in pthread_cancel, to ensure a barrier
Rich Felker [Thu, 31 Mar 2011 23:06:22 +0000 (19:06 -0400)]
simplify pthread_key_delete
calling this function on an uninitialized key value is UB, so there is
no need to check that the table pointer was initialized.
Rich Felker [Thu, 31 Mar 2011 23:04:56 +0000 (19:04 -0400)]
greatly simplify pthread_key_create (~20% size reduction)
Rich Felker [Wed, 30 Mar 2011 18:14:26 +0000 (14:14 -0400)]
add some missing prototypes for nonstandard functions (strsep, clearenv)
Rich Felker [Wed, 30 Mar 2011 17:04:55 +0000 (13:04 -0400)]
avoid all malloc/free in timer creation/destruction
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.
Rich Felker [Wed, 30 Mar 2011 16:06:39 +0000 (12:06 -0400)]
optimize timer creation and possibly protect against some minor races
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.
Rich Felker [Wed, 30 Mar 2011 14:32:45 +0000 (10:32 -0400)]
avoid crash on stupid but allowable usage of pthread_mutex_unlock
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.
Rich Felker [Wed, 30 Mar 2011 13:29:49 +0000 (09:29 -0400)]
rename __simple_malloc.c to lite_malloc.c - yes this affects behavior!
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").
Rich Felker [Wed, 30 Mar 2011 13:06:00 +0000 (09:06 -0400)]
streamline mutex unlock to remove a useless branch, use a_store to unlock
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.
Rich Felker [Wed, 30 Mar 2011 12:58:25 +0000 (08:58 -0400)]
cheap special-case optimization for normal mutexes
cycle-level benchmark on atom cpu showed typical pthread_mutex_lock
call dropping from ~120 cycles to ~90 cycles with this change. benefit
may vary with compiler options and version, but this optimization is
very cheap to make and should always help some.
Rich Felker [Wed, 30 Mar 2011 02:43:13 +0000 (22:43 -0400)]
reorder timer initialization so that timer_create does not depend on free
this allows small programs which only create times, but never delete
them, to use simple_malloc instead of the full malloc.
Rich Felker [Tue, 29 Mar 2011 22:30:27 +0000 (18:30 -0400)]
missing prototype for wcscoll (stub)
Rich Felker [Tue, 29 Mar 2011 19:11:25 +0000 (15:11 -0400)]
revert mutex "optimization" that turned out to be worse
Rich Felker [Tue, 29 Mar 2011 17:01:25 +0000 (13:01 -0400)]
implement POSIX timers
this implementation is superior to the glibc/nptl implementation, in
that it gives true realtime behavior. there is no risk of timer
expiration events being lost due to failed thread creation or failed
malloc, because the thread is created as time creation time, and
reused until the timer is deleted.
Rich Felker [Tue, 29 Mar 2011 16:58:22 +0000 (12:58 -0400)]
major improvements to cancellation handling
- there is no longer any risk of spoofing cancellation requests, since
the cancel flag is set in pthread_cancel rather than in the signal
handler.
- cancellation signal is no longer unblocked when running the
cancellation handlers. instead, pthread_create will cause any new
threads created from a cancellation handler to unblock their own
cancellation signal.
- various tweaks in preparation for POSIX timer support.
Rich Felker [Tue, 29 Mar 2011 14:05:57 +0000 (10:05 -0400)]
some preliminaries for adding POSIX timers
Rich Felker [Tue, 29 Mar 2011 13:00:22 +0000 (09:00 -0400)]
fix tempnam name generation, and a small bug in tmpnam on retry limit
Rich Felker [Tue, 29 Mar 2011 12:37:57 +0000 (08:37 -0400)]
make tmpfile fail after exceeding max tries.
Rich Felker [Tue, 29 Mar 2011 12:34:47 +0000 (08:34 -0400)]
fix tmpnam to generate better names, not depend on non-ISO-C symbols
Rich Felker [Tue, 29 Mar 2011 12:25:59 +0000 (08:25 -0400)]
fix messed-up errno if remove fails for a non-EISDIR reason
Rich Felker [Tue, 29 Mar 2011 12:24:28 +0000 (08:24 -0400)]
learned something new - remove is supposed to support directories on POSIX
Rich Felker [Tue, 29 Mar 2011 02:36:55 +0000 (22:36 -0400)]
revert some more spin optimizations that turned out to be pessimizations
Rich Felker [Tue, 29 Mar 2011 02:34:27 +0000 (22:34 -0400)]
fix bug from syscall overhaul: extra __syscall_ret call for 0-arg syscalls
this mainly just caused bloat, but could corrupt errno if a 0-arg
syscall ever failed.