path: root/src
AgeCommit message (Collapse)AuthorLines
2012-06-13add (currently stubbed due to stubbed strverscmp) versionsort functionRich Felker-0/+8
based on patch by Emil Renner Berthing, with minor changes to dirent.h for LFS64 and organization of declarations this code should work unmodified once a real strverscmp is added, but I've been hesitant to add it because the GNU strverscmp behavior is harmful in a lot of cases (for instance if you have numeric filenames in hex). at some point I plan on trying to design a variant of the algorithm that behaves better on a mix of filename styles.
2012-06-13add deprecated capabilities functionsRich Felker-0/+11
these were left in glibc for binary compatibility after the public part of the interface was removed, and libcap kept using them (with its own copy of the header files) rather than just making the syscalls directly. might as well add them since they're so small...
2012-06-09fix char signedness bug (arm-specific) in dynamic linkerRich Felker-1/+1
2012-06-09add pthread_attr_setstack interface (and get)Rich Felker-10/+39
i originally omitted these (optional, per POSIX) interfaces because i considered them backwards implementation details. however, someone later brought to my attention a fairly legitimate use case: allocating thread stacks in memory that's setup for sharing and/or fast transfer between CPU and GPU so that the thread can move data to a GPU directly from automatic-storage buffers without having to go through additional buffer copies. perhaps there are other situations in which these interfaces are useful too.
2012-06-08fix scanning of "-0x" pseudo-hex float (must give negative zero)Rich Felker-1/+1
2012-06-08fix %ls breakage in last printf fixRich Felker-2/+2
signedness issue kept %ls with no precision from working at all
2012-06-08fix printf %ls with precision limit over-read issueRich Felker-2/+2
printf was not printing too many characters, but it was reading one too many wchar_t elements from the input. this could lead to crashes if running off the page, or spurious failure if the conversion of the extra wchar_t resulted in EILSEQ.
2012-06-07fix scanf bug reading literals after width-limited fieldRich Felker-0/+1
the field width limit was not being cleared before reading the literal, causing spurious failures in scanf in cases like "%2d:" scanning "00:".
2012-06-06treat failure of mprotect in map_library as a fatal load failureRich Felker-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.
2012-06-05fix ctype abi junk (pointer should point to 0 slot, not -128 slot)Rich Felker-3/+3
2012-06-02ensure that abort always worksRich Felker-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.
2012-06-02add some ugly aliases for LSB ABI compatibilityRich Felker-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).
2012-06-02increase default thread stack size to 80kRich Felker-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.
2012-06-02remove implementation-reserved bits when saving signal maskRich Felker-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.
2012-06-02remove no-longer-needed unblocking of signals in pthread_createRich Felker-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.
2012-06-02add LSB abi junk for ctype functionsRich Felker-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).
2012-06-02use fistpll mnemonic instead of fistpq (more widely supported) on x86_64 tooRich Felker-1/+1
this was fixed previously on i386 but the corresponding code on x86_64 was missed.
2012-05-31add LSB ABI __xstat, etc. junkRich Felker-0/+36
2012-05-31enable LARGEFILE64 aliasesRich Felker-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.
2012-05-27add ldd and main program loading support to dynamic linkerRich Felker-21/+89
2012-05-27cleanup dynamic linker start code cruftRich Felker-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).
2012-05-26fix overrun (n essentially ignored) in wcsncmpRich Felker-1/+1
bug report and solution by Richard Pennington
2012-05-26fix failure of mbsinit(0) (not UB; required to return nonzero)Rich Felker-1/+1
issue reported by Richard Pennington; slightly simpler fix applied
2012-05-26fix failure of strrchr(str, 0)Rich Felker-1/+1
bug report and solution by Richard Pennington
2012-05-25avoid using pthread cleanup push/pop in stdio when not neededRich Felker-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.
2012-05-25ensure pthread-internal signals are unblocked before threads are usedRich Felker-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.
2012-05-25fix regex on armRich Felker-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.
2012-05-25remove cruft from pthread structure (old cancellation stuff)Rich Felker-2/+0
2012-05-25remove leftover cp_sp cruft from cancellation code, fix small bugRich Felker-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.
2012-05-24avoid deprecated (by linux) alarm syscall; use setitimer insteadRich Felker-1/+4
2012-05-24linux deprecated SYS_utime on some archs, so use SYS_utimes insteadRich Felker-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...
2012-05-23fix bad opcode in arm syscall_cp_asmRich Felker-1/+1
2012-05-23fix issue with longjmp out of signal handlers and cancellationRich Felker-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.
2012-05-23simplify cancellation push/pop slightlyRich Felker-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.
2012-05-22remove everything related to forkallRich Felker-77/+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.
2012-05-21fix typo in utimes function that made it mess up file timesRich Felker-1/+1
2012-05-21fix out-of-bounds array access in pthread barriers on 64-bitRich Felker-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.
2012-05-16fix misplaced semicolon in preprocessor directive (#undef h_errno)Rich Felker-1/+1
2012-05-13remove some no-op end of string tests from regex parserRich Felker-4/+0
these are cruft from the original code which used an explicit string length rather than null termination. i blindly converted all the checks to null terminator checks, without noticing that in several cases, the subsequent switch statement would automatically handle the null byte correctly.
2012-05-13another BRE fix: in ^*, * is literalRich Felker-0/+2
i don't understand why this has to be conditional on being in BRE mode, but enabling this code unconditionally breaks a huge number of ERE test cases.
2012-05-13let sysconf accurately report # of cpus availableRich Felker-2/+10
i've been trying out openmp and it seems like it won't be much use without this...
2012-05-12use __h_errno_location for h_errnoRich Felker-0/+9
we do not bother making h_errno thread-local since the only interfaces that use it are inherently non-thread-safe. but still use the potentially-thread-local ABI to access it just to avoid lock-in.
2012-05-13search: add comments to tsearch_avl.cnsz-0/+6
2012-05-13search: add tdestroy (gnu extension)nsz-0/+21
2012-05-10Merge remote-tracking branch 'nsz/master'Rich Felker-5/+8
2012-05-10remove __lock dependency from exitRich Felker-2/+4
there's no sense in using a powerful lock in exit, because it will never be unlocked. a thread that arrives at exit while exit is already in progress just needs to hang forever. use the pause syscall for this because it's cheap and easy and universally available.
2012-05-10fix missing static (namespace clash)Rich Felker-1/+1
2012-05-08math: fix remquo.c when x==-y and a subnormal remainder bug as wellnsz-5/+8
backported fix from freebsd:
2012-05-07some assemblers don't like fistpq; use the alt. mnemonic fistpllRich Felker-3/+3
2012-05-07fix error checking for \ at end of regex (this was broken previously)Rich Felker-1/+1