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* implement stub versions of sched_*Rich Felker2012-05-037-0/+49
| | | | | these actually work, but for now they prohibit actually setting priority levels and report min/max priority as 0.
* uglify headers for the sake of junk that compiles with gcc -std=c89/-ansiRich Felker2012-05-032-6/+24
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* add additional compatibility union member for ipv6 addressesRich Felker2012-05-031-0/+2
| | | | in6_* is in the reserved namespace, so this is valid
* overhaul SSP support to use a real canaryRich Felker2012-05-036-12/+25
| | | | | | | | | | | | | pthread structure has been adjusted to match the glibc/GCC abi for where the canary is stored on i386 and x86_64. it will need variants for other archs to provide the added security of the canary's entropy, but even without that it still works as well as the old "minimal" ssp support. eventually such changes will be made anyway, since they are also needed for GCC/C11 thread-local storage support (not yet implemented). care is taken not to attempt initializing the thread pointer unless the program actually uses SSP (by reference to __stack_chk_fail).
* make all .o files depend on *_impl.h and libc.hRich Felker2012-05-031-2/+3
| | | | | | | | | | | | | hopefully the annoyance of this will be minimal. these files all define internal interfaces which can change at any time; if different modules are using different versions of the interfaces, the library will badly break. ideally we would scan and add the dependency only for C files that actually reference the affected interfaces, but for now, err on the side of caution and force a rebuild of everything if any of them have changed. this commit is in preparation for the upcoming ssp overhaul commit, which will change internals of the pthread struct.
* remove some junk from x86_64 start filesRich Felker2012-05-022-4/+0
| | | | | | | | | looks like nik copied these "extra arguments" from the i386 code. they're not actually arguments there, just 1-byte instructions to make sure the stack is aligned to 16 bytes after all the other arguments are pushed. since each push is 8 bytes on x86_64, they happened to have no effect here, but their presence is confusing and a minor waste of space.
* PIE support for x86_64 (untested)Rich Felker2012-05-021-0/+18
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* consistency cleanup: removed redundant size suffixed from i386 asmRich Felker2012-05-022-22/+22
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* PIE support for i386Rich Felker2012-05-023-1/+25
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* remove attempts to be pie-compatible from i386 crt1.sRich Felker2012-05-021-6/+3
| | | | | | | | | | it does not work; after further consideration, a separate Scrt1.s for pie really is essential. it would be nice if the unified approach worked, but the linker fails to generate the correct PLT entries and instead puts textrels in the main program, which don't work because the kernel maps the text read-only. new Scrt1.s will be committed soon in place of this.
* fix longstanding exit logic bugs in mbsnrtowcs and wcsnrtombsRich Felker2012-05-022-4/+9
| | | | | | | | these are POSIX 2008 (previously GNU extension) functions that are rarely used. apparently they had never been tested before, since the end-of-string logic was completely missing. mbsnrtowcs is used by modern versions of bash for its glob implementation, and and this bug was causing tab completion to hang in an infinite loop.
* remove minimal linux kernel headersRich Felker2012-05-015-621/+0
| | | | | | | | | | | these were at best of limited usefulness (for bootstrapping new systems, mainly) and at worst caused real kernel headers to get overwritten when upgrading libc. in case they're needed by anyone, the exact same files are now available in a new git repository: git://git.etalabs.net/mini-lkh
* reorganize Makefile to support "least surprise" config/make semanticsRich Felker2012-05-011-11/+23
| | | | | | | | | | | the major change here is that CFLAGS is now a variable that can be changed entirely under user control, without causing essential flags to be lost. previously, "CFLAGS += ..." was valid in config.mak, but using "CFLAGS = ..." in config.mak would have badly broken the build process unless the user took care to copy the necessary flags out of the main Makefile. I have also added a distclean target that removes config.mak.
* remove objcopy --weaken from the makefileRich Felker2012-05-011-2/+0
| | | | | | | | as far as I can tell, it's not useful and never way. I wrote it way back under the assumption that non-weak symbols in the POSIX or extension namespace could conflict with legitimate uses of the same symbol name in the main program or other libraries, but that does not seem to be the case.
* support alternate glibc name pow10 for exp10Rich Felker2012-05-014-0/+12
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* add C stub for sqrtl (already implemented in asm on i386 and x86_64)Rich Felker2012-04-301-0/+9
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* first try at writing an efficient and "correct" exp10Rich Felker2012-04-304-0/+59
| | | | | | | | | this is a nonstandard function so it's not clear what conditions it should satisfy. my intent is that it be fast and exact for positive integral exponents when the result fits in the destination type, and fast and correctly rounded for small negative integral exponents. otherwise we aim for at most 1ulp error; it seems to differ from pow by at most 1ulp and it's often 2-5 times faster than pow.
* make stack protector work with gcc configured for non-tls canaryRich Felker2012-04-301-0/+2
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* fix off-by-one error that caused uninitialized memory read in floatscanRich Felker2012-04-301-1/+1
| | | | | | this caused misreading of certain floating point values that are exact multiples of large powers of ten, unpredictable depending on prior stack contents.
* fix typo in the x86_64 rounding asmRich Felker2012-04-294-4/+4
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* new math asm (abs/rounding) for x86_64Rich Felker2012-04-296-0/+36
| | | | untested
* fix float_t and double_t defs on x86 when -mfpmath=sse -msse2 is usedRich Felker2012-04-291-0/+5
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* add linux-specific unshare syscall wrapperRich Felker2012-04-292-0/+9
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* fix longstanding missing static in mq_notify (namespace pollution)Rich Felker2012-04-291-1/+1
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* new fnmatch implementationRich Felker2012-04-281-131/+273
| | | | | | | | | | unlike the old one, this one's algorithm does not suffer from potential stack overflow issues or pathologically bad performance on certain patterns. instead of backtracking, it uses a matching algorithm which I have not seen before (unsure whether I invented or re-invented it) that runs in O(1) space and O(nm) time. it may be possible to improve the time to O(n), but not without significantly greater complexity.
* support FLT_EVAL_METHOD changing on x86 with gcc -msse2 -mfpmath=sseRich Felker2012-04-271-0/+4
| | | | | if the compiler provides a value, use it; otherwise fallback to the platform default (2).
* update fnmatch to POSIX 2008 semanticsRich Felker2012-04-261-4/+11
| | | | | | | an invalid bracket expression must be treated as if the opening bracket were just a literal character. this is to fix a bug whereby POSIX left the behavior of the "[" shell command undefined due to it being an invalid bracket expression.
* release notes for 0.8.10 v0.8.10Rich Felker2012-04-251-0/+28
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* gdb shared library debugging supportRich Felker2012-04-251-5/+32
| | | | | provide the minimal level of dynamic linker-to-debugger glue needed to let gdb find loaded libraries and load their symbols.
* first attempt at enabling stack protector supportRich Felker2012-04-243-0/+28
| | | | | | | | the code is written to pre-init the thread pointer in static linked programs that pull in __stack_chk_fail or dynamic-linked programs that lookup the symbol. no explicit canary is set; the canary will be whatever happens to be in the thread structure at the offset gcc hard-coded. this can be improved later.
* use signed char rather than plain char for int8_tRich Felker2012-04-243-12/+12
| | | | otherwise this BADLY breaks if -funsigned-char is passed to gcc
* add another example option to dist/config.makRich Felker2012-04-241-0/+3
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* ditch the priority inheritance locks; use malloc's version of lockRich Felker2012-04-2415-77/+54
| | | | | | | | | | | | | | | | | | | i did some testing trying to switch malloc to use the new internal lock with priority inheritance, and my malloc contention test got 20-100 times slower. if priority inheritance futexes are this slow, it's simply too high a price to pay for avoiding priority inversion. maybe we can consider them somewhere down the road once the kernel folks get their act together on this (and perferably don't link it to glibc's inefficient lock API)... as such, i've switch __lock to use malloc's implementation of lightweight locks, and updated all the users of the code to use an array with a waiter count for their locks. this should give optimal performance in the vast majority of cases, and it's simple. malloc is still using its own internal copy of the lock code because it seems to yield measurably better performance with -O3 when it's inlined (20% or more difference in the contention stress test).
* internal locks: new owner of contended lock must set waiters flagRich Felker2012-04-241-1/+1
| | | | | | | | | | | | | | | | | | | | | | this bug probably would have gone unnoticed since it's only used in the fallback code for systems where priority-inheritance locking fails. unfortunately this approach results in one spurious wake syscall on the final unlock, when there are no waiters remaining. the alternative (possibly better) would be to use broadcast wakes instead of reflagging the waiter unconditionally, and let each waiter reflag itself; this saves one syscall at the expense of invoking the "thundering herd" effect (worse performance degredation) when there are many waiters. ideally we would be able to update all of our locks to use an array of two ints rather than a single int, and use a separate counter system like proper mutexes use; then we could avoid all spurious wake calls without resorting to broadcasts. however, it's not clear to me that priority inheritance futexes support this usage. the kernel sets the waiters flag for them (just like we're doing now) and i can't tell if it's safe to bypass the kernel when unlocking just because we know (from private data, the waiter count) that there are no waiters. this is something that could be explored in the future.
* new internal locking primitive; drop spinlocksRich Felker2012-04-242-7/+29
| | | | | | we use priority inheritance futexes if possible so that the library cannot hit internal priority inversion deadlocks in the presence of realtime priority scheduling (full support to be added later).
* new wcwidth implementation (fast table-based)Rich Felker2012-04-243-179/+125
| | | | | | | | | | | | | | | i tried to go with improving the old binary-search-based algorithm, but between growth in the number of ranges, bad performance, and lack of confidence in the binary search code's stability under changes in the table, i decided it was worth the extra 1.8k to have something clean and maintainable. also note that, like the alpha and punct tables, there's definitely room to optimize the nonspacing/wide tables by overlapping subtables. this is not a high priority, but i've begun looking into how to do it, and i suspect the table sizes can be roughly halved. if that turns out to be true, the new, fast, table-based implementation will be roughly the same size as if i had just extended the old binary search one.
* sync case mappings with unicode 6.1Rich Felker2012-04-232-8/+30
| | | | | | | also special-case ß (U+00DF) as lowercase even though it does not have a mapping to uppercase. unicode added an uppercase version of this character but does not map it, presumably because the uppercase version is not actually used except for some obscure purpose...
* optimize iswprintRich Felker2012-04-231-3/+12
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* fix spurious punct class for some surrogate codepoints (invalid)Rich Felker2012-04-231-59/+56
| | | | this happened due to their entries in UnicodeData.txt
* destubify iswalpha and update iswpunct to unicode 6.1Rich Felker2012-04-235-135/+252
| | | | | | | | | | | | | | | alpha is defined as unicode property "Alphabetic" plus category Nd minus ASCII digits minus 2 special-cased Thai punctuation marks supposedly misclassified by Unicode as letters. punct is defined as all of unicode except control, alphanumeric, and space characters. the tables were generated by a simple tool based on the code posted previously to the mailing list. in the future, this and other code used for maintaining locale/iconv/i18n data will be published either in the main source repository or in a separate locale data generation repository.
* make dlerror produce informative resultsRich Felker2012-04-231-4/+15
| | | | | | | | | | note that dlerror is specified to be non-thread-safe, so no locking is performed on the error flag or message aside from the rwlock already held by dlopen or dlsym. if 2 invocations of dlsym are generating errors at the same time, they could clobber each other's results, but the resulting string, albeit corrupt, will still be null-terminated. any use of dlerror in such a situation could not be expected to give meaningful results anyway.
* implement getusershell, etc. legacy functionsRich Felker2012-04-222-0/+36
| | | | | I actually wrote these a month ago but forgot to integrate them. ugly, probably-harmful-to-use functions, but some legacy apps want them...
* getdtablesize is not standard; move it to its correct spot in unistd.hRich Felker2012-04-221-1/+1
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* new gcc wrapper, entirely specfile basedRich Felker2012-04-224-63/+47
| | | | | | | | | | | | | the _concept_ of this wrapper has been tested extensively, but the integration with the build/install system, and using a persistent specfile rather than one generated at build-time, have not been heavily tested and may need minor tweaks. this approach should be a lot more robust (and easier to improve) than writing a shell script that's responsible for trying to mimic gcc's logic about whether it's compiling or linking, building shared libs or executable files, etc. it's also lighter weight and should result in mildly faster builds when using the wrapper.
* remove redundant (unmaintained) check in floatscanRich Felker2012-04-221-3/+3
| | | | also be extra careful to avoid wrapping the circular buffer early
* fix breakage in endian.hRich Felker2012-04-221-1/+1
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* add some ugly byte swapping cruft in endian.hRich Felker2012-04-221-0/+59
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* add getresuid and getresgid syscall wrappersRich Felker2012-04-223-0/+18
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* fix major breakage in iconv, bogus rejecting of dest charsetsRich Felker2012-04-211-1/+1
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* make floatscan correctly set errno for overflow/underflowRich Felker2012-04-211-4/+16
| | | | | | | | | | | care is taken that the setting of errno correctly reflects underflow condition. scanning exact denormal values does not result in ERANGE, nor does scanning values (such as the usual string definition of FLT_MIN) which are actually less than the smallest normal number but which round to a normal result. only the decimal case is handled so far; hex float require a separate fix to come later.