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* add configure check for gnu linker hash style settingRich Felker2012-06-061-1/+20
| | | | | | | | | | | some broken distro-provided toolchains have modified gcc to produce only "gnu hash" dynamic hash table by default. as this is unsupported by musl, that results in a non-working libc.so. we detect and switch this on in configure rather than hard-coding it in the Makefile because it's not supported by old binutils versions, but that might not even be relevant since old binutils versions already fail from -Bsymbolic-functions being missing. at some point I may review whether this should just go in the Makefile...
* make gcc wrapper rewrite link options rather than just extending themRich Felker2012-06-061-3/+1
| | | | | this is not tested yet, but should work to get rid of unwanted --hash-style=gnu hacks present in some distro-patched gcc versions.
* treat failure of mprotect in map_library as a fatal load failureRich Felker2012-06-061-9/+9
| | | | | | | | | | | | | | | | | | | | the error will propagate up and be printed to the user at program start time; at runtime, dlopen will just fail and leave a message for dlerror. previously, if mprotect failed, subsequent attempts to perform relocations would crash the program. this was resulting in an increasing number of false bug reports on grsec systems where rwx permission is not possible in cases where users were wrongly attempting to use non-PIC code in shared libraries. supporting that usage is in theory possible, but the x86_64 toolchain does not even support textrels, and the cost of keeping around the necessary information to handle textrels without rwx permissions is disproportionate to the benefit (which is essentially just supporting broken library setups on grsec machines). also, i unified the error-out code in map_library now that there are 3 places from which munmap might have to be called.
* fix ctype abi junk (pointer should point to 0 slot, not -128 slot)Rich Felker2012-06-053-3/+3
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* _GNU_SOURCE is supposed to imply _LARGEFILE64_SOURCERich Felker2012-06-0415-15/+15
| | | | | | | | | this is ugly and stupid, but now that the *64 symbol names exist, a lot of broken GNU software detects them in configure, then either breaks during build due to missing off64_t definition, or attempts to compile without function declarations/prototypes. "fixing" it here is easier than telling everyone to add yet another feature test macro to their builds.
* release notes for 0.9.1 v0.9.1Rich Felker2012-06-031-0/+34
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* fix configure build/host/target terminology usageRich Felker2012-06-031-13/+14
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* ensure that abort always worksRich Felker2012-06-021-0/+2
| | | | | | | | | | | | | | | | Per POSIX, "The abort() function shall cause abnormal process termination to occur, unless the signal SIGABRT is being caught and the signal handler does not return." If SIGABRT is blocked or if a signal handler is installed and does return, abort is still required to cause abnormal program termination. We cannot use a_crash() to do this, since a SIGILL handler could also be installed (and might even longjmp out of the abort, not expecting to be invoked from within abort), nor can we rely on resetting the signal handler and re-raising the signal (this has race conditions in multi-threaded programs). On the other hand, SIGKILL is a perfectly safe, unblockable way to obtain abnormal program termination, and it requires no ugly loop-and-retry logic.
* add some ugly aliases for LSB ABI compatibilityRich Felker2012-06-027-0/+8
| | | | | | for some nonsensical reason, glibc's headers use inline functions that redirect some of the standard functions to ugly nonstandard names (and likewise for some of their nonstandard functions).
* increase default thread stack size to 80kRich Felker2012-06-021-1/+1
| | | | | | | | | | | | | | | | I've been looking for data that would suggest a good default, and since little has shown up, i'm doing this based on the limited data I have. the value 80k is chosen to accommodate 64k of application data (which happens to be the size of the buffer in git that made it crash without a patch to call pthread_attr_setstacksize) plus the max stack usage of most libc functions (with a few exceptions like crypt, which will be fixed soon to avoid excessive stack usage, and [n]ftw, which inherently uses a fair bit in recursive directory searching). if further evidence emerges suggesting that the default should be larger, I'll consider changing it again, but I'd like to avoid it getting too large to avoid the issues of large commit charge and rapid address space exhaustion on 32-bit machines.
* remove implementation-reserved bits when saving signal maskRich Felker2012-06-021-1/+11
| | | | | | | | this fix is necessary because a program could be started with some of the implementation-reserved signals masked (e.g. due to exec having been called from a signal handler, or from a non-musl program) and then could obtain an invalid-to-use-later sigset_t as the old/saved signal mask.
* remove no-longer-needed unblocking of signals in pthread_createRich Felker2012-06-021-1/+0
| | | | | | | this action is now performed in pthread_self initialization; it must be performed there in case the first call to pthread_create is from a signal handler, in which case the old signal mask could be restored on return from the signal.
* add LSB abi junk for ctype functionsRich Felker2012-06-023-0/+104
| | | | | | | | this should be the last major fix needed to support running glibc-linked conforming POSIX programs with musl in place of glibc, as long as musl provides the features they need and they don't use pthread cancellation (which is implemented as c++ exceptions in glibc, and fundamentally incompatible with musl).
* declare environ in unistd.h when _GNU_SOURCE feature test macro is usedRich Felker2012-06-021-0/+1
| | | | | lots of broken programs expect this, and it's gotten to the point of being a troubleshooting FAQ topic. best to just fix it.
* use fistpll mnemonic instead of fistpq (more widely supported) on x86_64 tooRich Felker2012-06-021-1/+1
| | | | | this was fixed previously on i386 but the corresponding code on x86_64 was missed.
* add LSB ABI __xstat, etc. junkRich Felker2012-05-314-0/+36
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* enable LARGEFILE64 aliasesRich Felker2012-05-312-4/+1
| | | | | | | | these will NOT be used when compiling with -D_LARGEFILE64_SOURCE on musl; instead, they exist in the hopes of eventually being able to run some glibc-linked apps with musl sitting in place of glibc. also remove the (apparently incorrect) fcntl alias.
* fix musl-gcc wrapper to work with -pieRich Felker2012-05-301-1/+1
| | | | linking the wrong crt1.o resulted in textrels and thus crashing
* there is no such GNU function fpurge, only __fpurge.Rich Felker2012-05-281-1/+0
| | | | no idea where I got the idea fpurge should exist...
* add prototype for BSD/GNU stdio *_unlocked extension functionsRich Felker2012-05-281-2/+12
| | | | also fix up distinction of what is GNU-only and what's GNU+BSD
* remove duplicate lfs64 cruft in stdio.hRich Felker2012-05-281-2/+0
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* math: fix nextafter definition in tgmath.hnsz2012-05-281-1/+1
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* add ldd and main program loading support to dynamic linkerRich Felker2012-05-274-21/+89
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* cleanup dynamic linker start code cruftRich Felker2012-05-273-13/+6
| | | | | | | | | | | | | two actual issues: one is that __dynlink no longer wants/needs a GOT pointer argument, so the code to generate that argument can be removed. the other issue was that in the i386 code, argc/argv were being loaded into registers that would be call-clobbered, then copied to preserved registers, rather than just being loaded into the proper call-preserved registers to begin with. this cleanup is in preparation for adding new dynamic linker functionality (ability to explicitly invoke the dynamic linker to run a program).
* fix overrun (n essentially ignored) in wcsncmpRich Felker2012-05-261-1/+1
| | | | bug report and solution by Richard Pennington
* fix failure of mbsinit(0) (not UB; required to return nonzero)Rich Felker2012-05-261-1/+1
| | | | issue reported by Richard Pennington; slightly simpler fix applied
* fix failure of strrchr(str, 0)Rich Felker2012-05-261-1/+1
| | | | bug report and solution by Richard Pennington
* avoid using pthread cleanup push/pop in stdio when not neededRich Felker2012-05-252-6/+14
| | | | | | | | | | | | unfortunately in dynamic-linked programs, these macros cause pthread_self to be initialized, which costs a couple syscalls, and (much worse) would necessarily fail, crash, and burn on ancient (2.4 and earlier) kernels where setting up a thread pointer does not work. i'd like to do this in a more generic way that avoids all use of cleanup push/pop before pthread_self has been successfully called and avoids ugly if/else constructs like the one in this commit, but for now, this will suffice.
* ensure pthread-internal signals are unblocked before threads are usedRich Felker2012-05-251-0/+1
| | | | | | | | | | | if the process started with these signals blocked, cancellation could fail or setxid could deadlock. there is no way to globally unblock them after threads have been created. by unblocking them in the pthread_self initialization for the main thread, we ensure that they're unblocked before any other threads are created and also outside of any signal handler context (sigaction initialized pthread_self), which is important so that return from a signal handler won't re-block them.
* fix regex on armRich Felker2012-05-251-1/+1
| | | | | | | | | | | TRE has a broken assumption that wchar_t is signed, which is a sane expectation, but not required by the standard, and false on ARM's ABI. i leave tre_char_t as wchar_t for now, since a pointer to it is directly passed to functions that need pointer to wchar_t. it does not seem to break anything. and since the maximum unicode scalar value is 0x10ffff, just use that explicitly rather than using the max value of any particular C type.
* remove cruft from pthread structure (old cancellation stuff)Rich Felker2012-05-251-2/+0
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* remove leftover cp_sp cruft from cancellation code, fix small bugRich Felker2012-05-251-3/+1
| | | | | | | | | | | the bug was that cancellation requests which arrived while a cancellation point was interrupted by a signal handler would not be acted upon when the signal handler returns. this was because cp_sp was never set; it's no longer needed or used. instead, just always re-raise the signal when cancellation was not acted upon. this wastes a tiny amount of time in the rare case where it even matters, but it ensures correctness and simplifies the code.
* fix arm syscall.h to reflect which syscalls actually exist (on EABI)Rich Felker2012-05-241-22/+0
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* avoid deprecated (by linux) alarm syscall; use setitimer insteadRich Felker2012-05-241-1/+4
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* linux deprecated SYS_utime on some archs, so use SYS_utimes insteadRich Felker2012-05-241-1/+8
| | | | | | | | the old code could be kept for cases where SYS_utime is available, but it's not really worth the ifdef ugliness. and better to avoid deprecated stuff just in case the kernel devs ever get crazy enough to start removing it from archs where it was part of the ABI and breaking static bins...
* fix bad opcode in arm syscall_cp_asmRich Felker2012-05-231-1/+1
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* fix issue with longjmp out of signal handlers and cancellationRich Felker2012-05-234-52/+35
| | | | | | | | | | | | | | | | | | | stale state information indicating that a thread was possibly blocked at a cancellation point could get left behind if longjmp was used to exit a signal handler that interrupted a cancellation point. to fix the issue, we throw away the state information entirely and simply compare the saved instruction pointer to a range of code addresses in the __syscall_cp_asm function. all the ugly PIC work (which becomes minimal anyway with this approach) is defered to cancellation time instead of happening at every syscall, which should improve performance too. this commit also fixes cancellation on arm, which was mildly broken (race condition, not checking cancellation flag once inside the cancellation point zone). apparently i forgot to implement that. the new arm code is untested, but appears correct; i'll test and fix it later if there are problems.
* simplify cancellation push/pop slightlyRich Felker2012-05-232-12/+9
| | | | | no need to pass unnecessary extra arguments on to the core code in pthread_create.c. this just wastes cycles and code bloat.
* debloat jmp_buf in _GNU_SOURCE modeRich Felker2012-05-231-3/+0
| | | | | | | | i originally made it the same size as the bloated GNU version, which contains space for saved signal mask, but this makes some structures containing jmp_buf become much larger for no benefit. we will never use the signal mask field with plain setjmp; sigsetjmp serves that purpose.
* remove everything related to forkallRich Felker2012-05-224-78/+0
| | | | | | | | | | i made a best attempt, but the intended semantics of this function are fundamentally contradictory. there is no consistent way to handle ownership of locks when forking a multi-threaded process. the code could have worked by accident for programs that only used normal mutexes and nothing else (since they don't actually store or care about their owner), but that's about it. broken-by-design interfaces that aren't even in glibc (only solaris) don't belong in musl.
* some feature test fixes for unistd.hRich Felker2012-05-221-16/+16
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* fix missing _BSD_SOURCE support in bits/*.hRich Felker2012-05-229-12/+12
| | | | | | | | | | | | this is actually rather ugly, and would get even uglier if we ever want to support further feature test macros. at some point i may factor the bits headers into separate files for C base, POSIX base, and nonstandard extensions (the only distinctions that seem to matter now) and then the logic for which to include can go in the main header rather than being duplicated for each arch. the downside of this is that it would result in more files having to be opened during compilation, so as long as the ugliness does not grow, i'm inclined to leave it alone for now.
* _GNU_SOURCE implies all BSD features except ones GNU rejectsRich Felker2012-05-221-1/+1
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* various header cleanups, some related to _BSD_SOURCE additionRich Felker2012-05-223-17/+9
| | | | | | there is no reason to avoid multiple identical macro definitions; this is perfectly legal C, and even with the maximal warning options enabled, gcc does not issue any warning for it.
* bsd_signal is a legacy (removed) XSI function, not needed in _BSD_SOURCERich Felker2012-05-221-4/+1
| | | | | its only purpose was for use on non-BSD systems that implement sysv semantics for signal() by default.
* support _BSD_SOURCE feature test macroRich Felker2012-05-2222-41/+126
| | | | | patch by Isaac Dunham. matched closely (maybe not exact) to glibc's idea of what _BSD_SOURCE should make visible.
* fix typo in utimes function that made it mess up file timesRich Felker2012-05-211-1/+1
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* fix out-of-bounds array access in pthread barriers on 64-bitRich Felker2012-05-211-1/+1
| | | | | it's ok to overlap with integer slot 3 on 32-bit because only slots 0-2 are used on process-local barriers.
* move getpass decl to the right placeRich Felker2012-05-202-1/+1
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* fix misplaced semicolon in preprocessor directive (#undef h_errno)Rich Felker2012-05-161-1/+1
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