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* add isastream (obsolete STREAMS junk)Rich Felker2012-05-062-1/+9
| | | | | | apparently some packages see stropts.h and want to be able to use this. the implementation checks that the file descriptor is valid by using fcntl/F_GETFD so it can report an error if not (as specified).
* fix definitions of FP_ILOGB constantsRich Felker2012-05-051-2/+2
| | | | | | | | | | | | | | | two issues: (1) the type was wrong (unsigned instead of signed int), and (2) the value of FP_ILOGBNAN should be INT_MIN rather than INT_MAX to match the ABI. this is also much more useful since INT_MAX corresponds to a valid input (infinity). the standard would allow us to set FP_ILOGB0 to -INT_MAX instead of INT_MIN, which would give us distinct values for ilogb(0) and ilogb(NAN), but the benefit seems way too small to justify ignoring the ABI. note that the macro is just a "portable" (to any twos complement system where signed and unsigned int have the same width) way to write INT_MIN without needing limits.h. it's valid to use this method since these macros are not required to work in #if directives.
* add -frounding-math to buildRich Felker2012-05-051-0/+1
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* update readme and release notes for 0.9.0 release (not yet final)Rich Felker2012-05-052-16/+56
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* relicense musl under MIT licenseRich Felker2012-05-052-515/+33
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* update license of njk contributed code (x86_64 asm)Rich Felker2012-05-056-7/+9
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | these changes are based on the following communication via email: "I hereby grant that all of the code I have contributed to musl on or before April 23, 2012 may be licensed under the terms of the following MIT license: Copyright (c) 2011-2012 Nicholas J. Kain Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE."
* update INSTALL file to reflect configure script usageRich Felker2012-05-041-13/+23
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* initial commit of configure scriptRich Felker2012-05-041-0/+275
| | | | | | | | | this script is not based on autoconf; however it attempts to follow the same interface contracts for ease of integration with build systems. it is also not necessary to use musl. manually written config.mak files are still supported, as is building without any config.mak at all as long as you are happy with the default options and you supply at least ARCH on the command line to make.
* make pthread stacks non-executableRich Felker2012-05-041-1/+1
| | | | | | | | | | | | | this change is necessary or pthread_create will always fail on security-hardened kernels. i considered first trying to make the stack executable and simply retrying without execute permissions when the first try fails, but (1) this would incur a serious performance penalty on hardened systems, and (2) having the stack be executable is just a bad idea from a security standpoint. if there is real-world "GNU C" code that uses nested functions with threads, and it can't be fixed, we'll have to consider other ways of solving the problem, but for now this seems like the best fix.
* improve the build rules for installing /lib/ld-musl-$ARCH.soRich Felker2012-05-041-2/+4
| | | | | | these new rules should avoid spurious error messages when the directory (usually /lib) and the dynamic linker symlink already exist, and minimize the spam when they can't be created.
* Merge remote-tracking branch 'nsz/master'Rich Felker2012-05-042-20/+16
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| * math: change the formula used for acos.snsz2012-05-052-20/+16
| | | | | | | | | | | | | | | | | | | | old: 2*atan2(sqrt(1-x),sqrt(1+x)) new: atan2(fabs(sqrt((1-x)*(1+x))),x) improvements: * all edge cases are fixed (sign of zero in downward rounding) * a bit faster (here a single call is about 131ns vs 162ns) * a bit more precise (at most 1ulp error on 1M uniform random samples in [0,1), the old formula gave some 2ulp errors as well)
* | fix error reporting for dlsym with global symbolsRich Felker2012-05-041-1/+2
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* fix uninitialized var in vfwprintf printing 0-prec stringRich Felker2012-05-041-1/+1
| | | | this could lead to spurious failures of wide printf functions
* add *64 junk for sys/*.h headersRich Felker2012-05-047-0/+50
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* add support for ugly *64 functions with _LARGEFILE64_SOURCERich Felker2012-05-048-0/+68
| | | | | | | | | | | | | | | | musl does not support legacy 32-bit-off_t whatsoever. off_t is always 64 bit, and correct programs that use off_t and the standard functions will just work out of the box. (on glibc, they would require -D_FILE_OFFSET_BITS=64 to work.) however, some programs instead define _LARGEFILE64_SOURCE and use alternate versions of all the standard types and functions with "64" appended to their names. we do not want code to actually get linked against these functions (it's ugly and inconsistent), so macros are used instead of prototypes with weak aliases in the library itself. eventually the weak aliases may be added at the library level for the sake of using code that was originally built against glibc, but the macros will still be the desired solution in the headers.
* avoid setting nondefault scheduler tooRich Felker2012-05-031-1/+1
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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).
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