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2011-02-24various changes in preparation for dynamic linking supportRich Felker-8/+24
prefer using visibility=hidden for __libc internal data, rather than an accessor function, if the compiler has visibility. optimize with -O3 for PIC targets (shared library). without heavy inlining, reloading the GOT register in small functions kills performance. 20-30% size increase for a single libc.so is not a big deal, compared to comparaible size increase in every static binaries. use -Bsymbolic-functions, not -Bsymbolic. global variables are subject to COPY relocations, and thus binding their addresses in the library at link time will cause library functions to read the wrong (original) copies instead of the copies made in the main program's bss section. add entry point, _start, for dynamic linker.
2011-02-24apply feature test protection to memccpyRich Felker-1/+4
2011-02-24add implementation of memccpy functionRich Felker-0/+32
2011-02-24fix backwards conditional in stpncpyRich Felker-1/+1
this only made the function unnecessarily slow on systems with unaligned access, but would of course crash on systems that can't do unaligned accesses (none of which have ports yet).
2011-02-22rewind must clear the error indicator in addition to seekingRich Felker-2/+5
2011-02-21change errno to static linkage (improves PIC code generation)Rich Felker-4/+2
2011-02-21cleanup comment cruft in startup codeRich Felker-1/+0
2011-02-21make startup code PIE-compatibleRich Felker-2/+4
2011-02-21remove sample utf-8 code that's not part of the standard libraryRich Felker-47/+0
2011-02-20use an accessor function for __libc data pointer when compiled as PICRich Felker-4/+19
prior to this change, a large portion of libc was unusable prior to relocation by the dynamic linker, due to dependence on the global data in the __libc structure and the need to obtain its address through the GOT. with this patch, the accessor function __libc_loc is now able to obtain the address of __libc via PC-relative addressing without using the GOT. this means the majority of libc functionality is now accessible right away. naturally, the above statements all depend on having an architecture where PC-relative addressing and jumps/calls are feasible, and a compiler that generates the appropriate code.
2011-02-20avoid referencing address of extern function from vdprintfRich Felker-1/+6
this change is in preparation for upcoming PIC/shared library support. the intent is to avoid going through the GOT, mainly so that dprintf is operable immediately, prior to processing of relocations. having dprintf accessible from the dynamic linker will make writing and debugging the dynamic linker much easier.
2011-02-20shave off 2 bytes from crt1.o _startRich Felker-2/+2
2011-02-20cleanup asprintf stuffRich Felker-2/+2
2011-02-20prototypes for GNU asprintf/vasprintfRich Felker-0/+2
2011-02-20fix %n specifier, again. this time it was storing the wrong value.Rich Felker-7/+7
2011-02-20include sys/sysmacros.h from sys/types.h when _GNU_SOURCE is definedRich Felker-0/+1
2011-02-20fix typo in inotify structureRich Felker-1/+1
2011-02-20make malloc(0) return unique pointers rather than NULLRich Felker-6/+10
this change is made with some reluctance, but i think it's for the best. correct programs must handle either behavior, so there is little advantage to having malloc(0) return NULL. and i managed to actually make the malloc code slightly smaller with this change.
2011-02-20fix simple_malloc malloc(0) behavior not to return non-unique pointersRich Felker-0/+1
2011-02-20fix simple_malloc size restrictionsRich Felker-5/+6
do not allow allocations that overflow ptrdiff_t; fix some overflow checks that were not quite right but didn't matter due to address layout implementation.
2011-02-20fix null pointer dereference introduced in last sigprocmask commitRich Felker-1/+1
2011-02-20make real symbols for the legacy (nonstandardized) utmp functionsRich Felker-6/+23
this is needed in the long term for ABI compatibility anyway, and in the immediate, it helps with building broken programs like GNU screen that try to prototype the functions themselves rather than using the header.
2011-02-20resolve some header namespace non-issuesRich Felker-3/+0
after re-reading 2.2.2 of POSIX 2008, all of these are in the correct reserved namespaces and do not need protection.
2011-02-20move the GNU siginfo renaming so it doesn't lead to mismatching namesRich Felker-1/+4
2011-02-20fill in some missing siginfo stuff in signal.hRich Felker-10/+112
2011-02-20make sys/param.h not depend on PATH_MAX and NAME_MAXRich Felker-2/+2
this is a nonstandard header used only by backwards programs, but for some reason it's extremely popular. the recent namespace cleanup fixes broke it, because PATH_MAX and NAME_MAX will not be defined unless an approriate feature test macro has been defined. moreover, it's too late to just #define _GNU_SOURCE in param.h, since limits.h may have already been included. let's just hard-code standard values and be done with it.
2011-02-19workaround gcc bug 46926 by providing a dumb sincos implementationRich Felker-0/+8
note that this library itself is built with -ffreestanding so sincos.c should not be miscompiled even if the gcc used to compile musl has this bug.
2011-02-19use rt_sigprocmask, not legacy sigprocmask, syscall in pthread exit codeRich Felker-1/+1
2011-02-19fix typo in wordexp.h (note that the function is still unimplemented)Rich Felker-1/+1
2011-02-19implement the remaining clock_* interfacesRich Felker-0/+36
2011-02-19race condition fix: block all signals before decrementing thread countRich Felker-22/+2
the existence of a (kernelspace) thread must never have observable effects after the thread count is decremented. if signals are not blocked, it could end up handling the signal for rsyscall and contributing towards the count of threads which have changed ids, causing a thread to be missed. this could lead to one thread retaining unwanted privilege level. this change may also address other subtle race conditions in application code that uses signals.
2011-02-19prevent sigprocmask/pthread_sigmask from blocking implementation signalsRich Felker-3/+5
this code was wrongly disabled because the old version was trying to be too clever and didn't work. replaced it with a simple version for now.
2011-02-19make pthread_exit run dtors for last thread, wait to decrement thread countRich Felker-3/+3
2011-02-19make mktemp match the historic behavior, and update functions that use itRich Felker-5/+8
the historic mktemp is supposed to blank the template string on failure, rather than returning 0. just zero the first character so that mkstemp and mkdtemp can still retry with O(1) space requirement.
2011-02-19fix major bug created from copying mkdtemp logicRich Felker-1/+1
2011-02-19add syscall wrappers for inotifyRich Felker-0/+83
2011-02-19cleanup cruft left from when kernel and user time_t disagreedRich Felker-12/+3
2011-02-19prototype wait3 and wait4Rich Felker-3/+6
2011-02-19add missing WIFCONTINUED macro and improve WIFSIGNALEDRich Felker-2/+4
2011-02-19prototypes for brk and sbrkRich Felker-0/+2
2011-02-18support the ugly and deprecated ucontext and sigcontext header stuff...Rich Felker-20/+69
only the structures, not the functions from ucontext.h, are supported at this point. the main goal of this commit is to make modern gcc with dwarf2 unwinding build without errors. honestly, it probably doesn't matter how we define these as long as they have members with the right names to prevent errors while compiling libgcc. the only time they will be used is for propagating exceptions across signal-handler boundaries, which invokes undefined behavior anyway. but as-is, they're probably correct and may be useful to various low-level applications dealing with virtualization, jit code generation, and so on...
2011-02-18add pthread_atfork interfaceRich Felker-3/+57
note that this presently does not handle consistency of the libc's own global state during forking. as per POSIX 2008, if the parent process was threaded, the child process may only call async-signal-safe functions until one of the exec-family functions is called, so the current behavior is believed to be conformant even if non-ideal. it may be improved at some later time.
2011-02-18major improvements to temp file name generatorRich Felker-16/+21
use current time in nanoseconds and some potentially-random (if aslr is enabled) pointer values for the initial tempfile name generation, and step via a cheap linear prng on collisions. limit the number of retry attempts to prevent denial of service attacks even if an attacker can guess the filenames.
2011-02-18reformat mkstemp like mkdtempRich Felker-7/+5
this is cleaner and makes it easy to impose a limit on the number of retries later if it seems desirable to do so.
2011-02-17add portable lchown (trivial to support and a few ancient things want it..)Rich Felker-0/+10
2011-02-17prepare WHATSNEW for releasev0.6.0Rich Felker-1/+1
2011-02-17document in config.mak sample that x86_64 is supportedRich Felker-1/+1
2011-02-17update WHATSNEW in preparation for releaseRich Felker-2/+9
2011-02-17avoid deleting the lib/empty fileRich Felker-1/+1
2011-02-17reorganize pthread data structures and move the definitions to alltypes.hRich Felker-128/+158
this allows sys/types.h to provide the pthread types, as required by POSIX. this design also facilitates forcing ABI-compatible sizes in the arch-specific alltypes.h, while eliminating the need for developers changing the internals of the pthread types to poke around with arch-specific headers they may not be able to test.