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2012-06-14reorder exit code to defer stdio flush until after dtorsRich Felker1-4/+1
this is required in case dtors use stdio. also remove the old comments; one was cruft from when the code used to be using function pointers and conditional calls, and has little motivation now that we're using weak symbols. the other was just complaining about having to support dtors even though the cost was made essentially zero in the non-use case by the way it's done here.
2012-06-13revert one change in time.h; no evidence BSD_SOURCE should expose these..Rich Felker1-1/+1
2012-06-13fix feature test macros in time.hRich Felker1-5/+2
stime is not _XOPEN_SOURCE, and some functions were missing with _BSD_SOURCE..
2012-06-13add timegm function (inverse of gmtime), nonstandardRich Felker2-0/+12
2012-06-13add init_module/delete_module syscall wrappersRich Felker1-0/+11
these are not exposed publicly in any header, but the few programs that use them (modutils/kmod, etc.) are declaring the functions themselves rather than making the syscalls directly, and it doesn't really hurt to have them (same as the capset junk).
2012-06-13add (currently stubbed due to stubbed strverscmp) versionsort functionRich Felker2-0/+13
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 Felker1-0/+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 Felker1-1/+1
2012-06-09add pthread_attr_setstack interface (and get)Rich Felker4-10/+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 Felker1-1/+1
2012-06-08fix signedness errors in stdint.h constant macrosRich Felker1-2/+2
the types of these expressions must match the integer promotions. unsigned 8- and 16-bit values promote to signed int, not unsigned int.
2012-06-08fix %ls breakage in last printf fixRich Felker1-2/+2
signedness issue kept %ls with no precision from working at all
2012-06-08fix printf %ls with precision limit over-read issueRich Felker1-2/+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 sysinfo, try 2. it seems to work this time.Rich Felker1-10/+10
2012-06-07sysinfo struct was utter nonsense; no idea where it came from.Rich Felker1-4/+3
this broke the busybox "free" utility (memory reporting) and possibly other things like uptime.
2012-06-07fix scanf bug reading literals after width-limited fieldRich Felker1-0/+1
the field width limit was not being cleared before reading the literal, causing spurious failures in scanf in cases like "%2d:" scanning "00:".
2012-06-07check for ld support of -Bsymbolic-functions; disable shared if not availRich Felker1-0/+7
this issue affects the last gpl2 version of binutils, which some people are still using out of aversion to gpl3. musl requires -Bsymbolic-functions because it's the only way to make a libc.so that's able to operate prior to dynamic linking but that still behaves correctly with respect to global vars that may be moved to the main program via copy relocations.
2012-06-07use -nostdlib in linker tests to avoid possible missing crt/lib issuesRich Felker1-1/+1
2012-06-07avoid linking main program in linker testsRich Felker1-2/+2
it's possible that the user has provided a compiler that does not have any libc to link to, so linking a main program is a bad idea. instead, generate an empty shared library with no dependencies.
2012-06-06make configure try to disable stack protectorRich Felker1-0/+2
in theory we could support stack protector in the libc itself, and users wanting to experiment with such usage could add -fstack-protector to CFLAGS intentionally. but to avoid breakage in the default case, override broken distro-patched gcc that forces stack protector on.
2012-06-06add configure check for gnu linker hash style settingRich Felker1-1/+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...
2012-06-06make gcc wrapper rewrite link options rather than just extending themRich Felker1-3/+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.
2012-06-06treat failure of mprotect in map_library as a fatal load failureRich Felker1-9/+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 Felker3-3/+3
2012-06-04_GNU_SOURCE is supposed to imply _LARGEFILE64_SOURCERich Felker15-15/+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.
2012-06-03release notes for 0.9.1v0.9.1Rich Felker1-0/+34
2012-06-03fix configure build/host/target terminology usageRich Felker1-13/+14
2012-06-02ensure that abort always worksRich Felker1-0/+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 Felker7-0/+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 Felker1-1/+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 Felker1-1/+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 Felker1-1/+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 Felker3-0/+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).
2012-06-02declare environ in unistd.h when _GNU_SOURCE feature test macro is usedRich Felker1-0/+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.
2012-06-02use fistpll mnemonic instead of fistpq (more widely supported) on x86_64 tooRich Felker1-1/+1
this was fixed previously on i386 but the corresponding code on x86_64 was missed.
2012-05-31add LSB ABI __xstat, etc. junkRich Felker4-0/+36
2012-05-31enable LARGEFILE64 aliasesRich Felker2-4/+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.
2012-05-30fix musl-gcc wrapper to work with -pieRich Felker1-1/+1
linking the wrong crt1.o resulted in textrels and thus crashing
2012-05-28there is no such GNU function fpurge, only __fpurge.Rich Felker1-1/+0
no idea where I got the idea fpurge should exist...
2012-05-28add prototype for BSD/GNU stdio *_unlocked extension functionsRich Felker1-2/+12
also fix up distinction of what is GNU-only and what's GNU+BSD
2012-05-28remove duplicate lfs64 cruft in stdio.hRich Felker1-2/+0
2012-05-28math: fix nextafter definition in tgmath.hnsz1-1/+1
2012-05-27add ldd and main program loading support to dynamic linkerRich Felker4-21/+89
2012-05-27cleanup dynamic linker start code cruftRich Felker3-13/+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 Felker1-1/+1
bug report and solution by Richard Pennington
2012-05-26fix failure of mbsinit(0) (not UB; required to return nonzero)Rich Felker1-1/+1
issue reported by Richard Pennington; slightly simpler fix applied
2012-05-26fix failure of strrchr(str, 0)Rich Felker1-1/+1
bug report and solution by Richard Pennington
2012-05-25avoid using pthread cleanup push/pop in stdio when not neededRich Felker2-6/+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 Felker1-0/+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 Felker1-1/+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.
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