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2013-05-17remove the __STDC_FORMAT_MACROS nonsense from inttypes.hRich Felker-4/+0
somehow I missed this when removing the corresponding __STDC_LIMIT_MACROS and __STDC_CONSTANT_MACROS nonsense from stdint.h. these were all attempts by the C committee to guess what the C++ committee would want, and the guesses turned out to be wrong.
2013-05-16fix mknod and mknodat to accept large dev_t valuesRich Felker-5/+2
support for these was recently added to sysmacros.h. note that the syscall argument is a long, despite dev_t being 64-bit, so on 32-bit archs the high bits will be lost. it appears the high bits are just glibc silliness and not part of the kernel api, anyway, but it's nice that we have them there for future expansion if needed.
2013-05-15math: use double_t for temporaries to avoid stores on i386Szabolcs Nagy-28/+31
When FLT_EVAL_METHOD!=0 (only i386 with x87 fp) the excess precision of an expression must be removed in an assignment. (gcc needs -fexcess-precision=standard or -std=c99 for this) This is done by extra load/store instructions which adds code bloat when lot of temporaries are used and it makes the result less precise in many cases. Using double_t and float_t avoids these issues on i386 and it makes no difference on other archs. For now only a few functions are modified where the excess precision is clearly beneficial (mostly polynomial evaluations with temporaries). object size differences on i386, gcc-4.8: old new __cosdf.o 123 95 __cos.o 199 169 __sindf.o 131 95 __sin.o 225 203 __tandf.o 207 151 __tan.o 605 499 erff.o 1470 1416 erf.o 1703 1649 j0f.o 1779 1745 j0.o 2308 2274 j1f.o 1602 1568 j1.o 2286 2252 tgamma.o 1431 1424 math/*.o 64164 63635
2013-05-15support full range of dev_t major/minor numbers in makedev, etc. macrosRich Felker-3/+10
2013-05-06remove compound literals from math.h to please c++Szabolcs Nagy-5/+10
__FLOAT_BITS and __DOUBLE_BITS macros used union compound literals, now they are changed into static inline functions. A good C compiler generates the same code for both and the later is C++ conformant.
2013-05-05fix incorrect clock tick scaling in fallback case of clock()Rich Felker-1/+1
since CLOCKS_PER_SEC is 1000000 (required by XSI) and the times syscall reports values in 1/100 second units (Linux), the correct scaling factor is 10000, not 100. note that only ancient kernels which lack clock_gettime are affected.
2013-05-05do not interpret errors in return value of times() syscallRich Felker-1/+1
all return values are valid, and on 32-bit systems, values that look like errors can and will occur. since the only actual error this function could return is EFAULT, and it is only returnable when the application has invoked undefined behavior, simply ignore the possibility that the return value is actually an error code.
2013-04-26transition to using functions for internal signal blocking/restoringRich Felker-12/+57
there are several reasons for this change. one is getting rid of the repetition of the syscall signature all over the place. another is sharing the constant masks without costly GOT accesses in PIC. the main motivation, however, is accurately representing whether we want to block signals that might be handled by the application, or all signals.
2013-04-26optimize/debloat raiseRich Felker-2/+2
use __syscall rather than syscall when failure is not possible or not to be considered.
2013-04-26prevent code from running under a thread id which already gave ESRCHRich Felker-1/+7
2013-04-26synccall signal handler need not handle dead threads anymoreRich Felker-9/+0
they have already blocked signals before decrementing the thread count, so the code being removed is unreachable in the case where the thread is no longer counted.
2013-04-26fix clobbering of signal mask when creating thread with sched attributesRich Felker-1/+1
this was simply a case of saving the state in the wrong place.
2013-04-26make last thread's pthread_exit give exit(0) a consistent stateRich Felker-3/+13
the previous few commits ended up leaving the thread count and signal mask wrong for atexit handlers and stdio cleanup.
2013-04-26use atomic decrement rather than cas in pthread_exit thread countRich Felker-4/+1
now that blocking signals prevents any application code from running while the last thread is exiting, the cas logic is no longer needed to prevent decrementing below zero.
2013-04-26add comments on some of the pthread_exit logicRich Felker-2/+15
2013-04-26always block signals in pthread_exit before decrementing thread countRich Felker-2/+2
the thread count (1+libc.threads_minus_1) must always be greater than or equal to the number of threads which could have application code running, even in an async-signal-safe sense. there is at least one dangerous race condition if this invariant fails to hold: dlopen could allocate too little TLS for existing threads, and a signal handler running in the exiting thread could claim the allocated TLS for itself (via __tls_get_addr), leaving too little for the other threads it was allocated for and thereby causing out-of-bounds access. there may be other situations where it's dangerous for the thread count to be too low, particularly in the case where only one thread should be left, in which case locking may be omitted. however, all such code paths seem to arise from undefined behavior, since async-signal-unsafe functions are not permitted to be called from a signal handler that interrupts pthread_exit (which is itself async-signal-unsafe). this change may also simplify logic in __synccall and improve the chances of making __synccall async-signal-safe.
2013-04-26remove explicit locking to prevent __synccall setuid during posix_spawnRich Felker-13/+0
for the duration of the vm-sharing clone used by posix_spawn, all signals are blocked in the parent process, including implementation-internal signals. since __synccall cannot do anything until successfully signaling all threads, the fact that signals are blocked automatically yields the necessary safety. aside from debloating and general simplification, part of the motivation for removing the explicit lock is to simplify the synchronization logic of __synccall in hopes that it can be made async-signal-safe, which is needed to make setuid and setgid, which depend on __synccall, conform to the standard. whether this will be possible remains to be seen.
2013-04-22remove __STDC_LIMIT_MACROS and __STDC_CONSTANT_MACROS checks in stdint.hRich Felker-8/+0
C++11, the first C++ with stdint.h, requires the previously protected macros to be exposed unconditionally by stdint.h. apparently these checks were an early attempt by the C committee to guess what the C++ committee would want, and they guessed wrong.
2013-04-22fix reversed argument order x86_64 sigsetjmp's call to sigprocmaskRich Felker-2/+2
this caused sigsetjmp not to save the signal mask but instead to clobber it with whatever happened to be in the sigjmb_buf prior to the call.
2013-04-20comment potentially-confusing use of struct crypt_data typeRich Felker-1/+10
2013-04-20mention bits headers in another part of copyright fileRich Felker-1/+1
2013-04-20update copyright yearRich Felker-2/+2
2013-04-20clarify that bits headers are included as public headersRich Felker-6/+6
2013-04-20make dynamic linker accept : or \n as path separatorRich Felker-8/+8
this allows /etc/ld-musl-$(ARCH).path to contain one path per line, which is much more convenient for users than the :-delimited format, which was a source of repeated and unnecessary confusion. for simplicity, \n is also accepted in environment variables, though it should probably not be used there. at the same time, issues with overly long paths invoking UB or getting truncated have been fixed. such issues should not have arisen with the environment (which is size-limited) but could have been generated by a path file larger than 2**31 bytes in length.
2013-04-14release notes for 0.9.10v0.9.10Rich Felker-0/+52
2013-04-10make ifaddrs.h expose sys/socket.hRich Felker-0/+1
the getifaddrs interface seems to have been invented by glibc, and they expose socket.h, so for us not to do so is just gratuitous incompatibility with the interface we're mimicing.
2013-04-09getifaddrs: implement proper ipv6 netmasksrofl0r-2/+11
2013-04-08mbrtowc: do not leave mbstate_t in permanent-fail state after EILSEQRich Felker-1/+1
the standard is clear that the old behavior is conforming: "In this case, [EILSEQ] shall be stored in errno and the conversion state is undefined." however, the specification of mbrtowc has one peculiarity when the source argument is a null pointer: in this case, it's required to behave as mbrtowc(NULL, "", 1, ps). no motivation is provided for this requirement, but the natural one that comes to mind is that the intent is to reset the mbstate_t object. for stateful encodings, such behavior is actually specified: "If the corresponding wide character is the null wide character, the resulting state described shall be the initial conversion state." but in the case of UTF-8 where the mbstate_t object contains a partially-decoded character rather than a shift state, a subsequent '\0' byte indicates that the previous partial character is incomplete and thus an illegal sequence. naturally, applications using their own mbstate_t object should clear it themselves after an error, but the standard presently provides no way to clear the builtin mbstate_t object used when the ps argument is a null pointer. I suspect this issue may be addressed in the future by specifying that a null source argument resets the state, as this seems to have been the intent all along. for what it's worth, this change also slightly reduces code size.
2013-04-08implement mbtowc directly, not as a wrapper for mbrtowcRich Felker-5/+39
the interface contract for mbtowc admits a much faster implementation than mbrtowc can achieve; wrapping mbrtowc with an extra call frame only made the situation worse. since the regex implementation uses mbtowc already, this change should improve regex performance too. it may be possible to improve performance in other places internally by switching from mbrtowc to mbtowc.
2013-04-08optimize mbrtowcRich Felker-3/+2
this simple change, in my measurements, makes about a 7% performance improvement. at first glance this change would seem like a compiler-specific hack, since the modified code is not even used. however, I suspect the reason is that I'm eliminating a second path into the main body of the code, allowing the compiler more flexibility to optimize the normal (hot) path into the main body. so even if it weren't for the measurable (and quite notable) difference in performance, I think the change makes sense.
2013-04-08fix out-of-bounds access in UTF-8 decodingRich Felker-1/+1
SA and SB are used as the lowest and highest valid starter bytes, but the value of SB was one-past the last valid starter. this caused access past the end of the state table when the illegal byte '\xf5' was encountered in a starter position. the error did not show up in full-character decoding tests, since the bogus state read from just past the table was unlikely to admit any continuation bytes as valid, but would have shown up had we tested feeding '\xf5' to the byte-at-a-time decoding in mbrtowc: it would cause the funtion to wrongly return -2 rather than -1. I may eventually go back and remove all references to SA and SB, replacing them with the values; this would make the code more transparent, I think. the original motivation for using macros was to allow misguided users of the code to redefine them for the purpose of enlarging the set of accepted sequences past the end of Unicode...
2013-04-07fix signalfd not to ignore flagsRich Felker-1/+12
also include fallback code for broken kernels that don't support the flags. as usual, the fallback has a race condition that can leak file descriptors.
2013-04-06silence nonsensical warnings in timer_createRich Felker-2/+2
2013-04-06add support for program_invocation[_short]_nameRich Felker-2/+18
this is a bit ugly, and the motivation for supporting it is questionable. however the main factors were: 1. it will be useful to have this for certain internal purposes anyway -- things like syslog. 2. applications can just save argv[0] in main, but it's hard to fix non-portable library code that's depending on being able to get the invocation name without the main application's help.
2013-04-06fix argument omission in ABI-compat weak_alias for fscanfRich Felker-1/+1
2013-04-05Add ABI compatability aliases.Isaac Dunham-0/+38
GNU used several extensions that were incompatible with C99 and POSIX, so they used alternate names for the standard functions. The result is that we need these to run standards-conformant programs that were linked with glibc.
2013-04-06fix type error in pthread_create, introduced with pthread_getattr_npRich Felker-1/+1
2013-04-06getifaddrs: remove unused labelrofl0r-1/+0
2013-04-05getifaddrs: use if_nameindex to enumerate interfacesrofl0r-23/+9
2013-04-05getifaddrs: one less indent levelrofl0r-30/+28
2013-04-05getifaddrs: less mallocrofl0r-55/+52
2013-04-05include/ifaddrs.h: add prototypes for get/freeifaddrsrofl0r-0/+3
2013-04-05add getifaddrsrofl0r-0/+222
supports ipv4 and ipv6, but not the "extended" usage where usage statistics and other info are assigned to ifa_data members of duplicate entries with AF_PACKET family.
2013-04-05net/if.h: add some missing IFF_ constantsrofl0r-0/+5
2013-04-04add prototype for dn_skipnameRich Felker-0/+1
2013-04-04implement dn_skipname (legacy resolver function)Rich Felker-0/+12
2013-04-05add arpa/tftp.hrofl0r-0/+31
2013-04-04fix type issues in stdint.h so underlying types of 64-bit types match ABIRich Felker-8/+33
2013-04-04eliminate bits/wchar.hRich Felker-26/+15
the preprocessor can reliably determine the signedness of wchar_t. L'\0' is used for 0 in the expressions so that, if the underlying type of wchar_t is long rather than int, the promoted type of the expression will match the type of wchar_t.
2013-04-04eliminate gcc dependency for testing char signedness in limits.hRich Felker-1/+1