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2012-08-17fix extremely rare but dangerous race condition in robust mutexesRich Felker3-20/+33
if new shared mappings of files/devices/shared memory can be made between the time a robust mutex is unlocked and its subsequent removal from the pending slot in the robustlist header, the kernel can inadvertently corrupt data in the newly-mapped pages when the process terminates. i am fixing the bug by using the same global vm lock mechanism that was used to fix the race condition with unmapping barriers after pthread_barrier_wait returns.
2012-08-17fix float parsing logic for long decimal expansionsRich Felker1-1/+1
this affects at least the case of very long inputs, but may also affect shorter inputs that become long due to growth while upscaling. basically, the logic for the circular buffer indices of the initial base-10^9 digit and the slot one past the final digit, and for simplicity of the loop logic, assumes an invariant that they're not equal. the upscale loop, which can increase the length of the base-10^9 representation, attempted to preserve this invariant, but was actually only ensuring that the end index did not loop around past the start index, not that the two never become equal. the main (only?) effect of this bug was that subsequent logic treats the excessively long number as having no digits, leading to junk results.
2012-08-15handle null arguments to legacy bsd err.h functionsRich Felker1-2/+2
2012-08-15add missing xattr functionsRich Felker1-0/+15
not sure why these were originally omitted..
2012-08-13Merge remote-tracking branch 'nsz/exp'Rich Felker2-40/+35
2012-08-13remove significandlRich Felker1-7/+0
this function never existed historically; since the float/double functions it's based on are nonstandard and deprecated, there's really no justification for its existence except that glibc has it. it can be added back if there's ever really a need...
2012-08-13add significand[fl] math functionsRich Felker3-0/+21
2012-08-11memcpy asm for i386 and x86_64Rich Felker2-0/+51
2012-08-11remove unused but buggy code from strstr.cRich Felker1-10/+0
2012-08-11remove buggy short-string wcsstr implementation; always use twowayRich Felker1-9/+0
since this interface is rarely used, it's probably best to lean towards keeping code size down anyway. one-character needles will still be found immediately by the initial wcschr call anyway.
2012-08-11add bsd fgetln functionRich Felker3-1/+21
optimized to avoid allocation and return lines directly out of the stream buffer whenever possible.
2012-08-10minor but worthwhile optimization in printf: avoid expensive strspnRich Felker1-4/+2
the strspn call was made for every format specifier and end-of-string, even though the expected return value was 1-2 for normal usage. replace with simple loop.
2012-08-10trivial optimization to printf: avoid wasted call frameRich Felker1-1/+1
amusingly, this cuts more than 10% off the run time of printf("a"); on the machine i tested it on. sadly the same optimization is not possible for snprintf without duplicating all the pseudo-FILE setup code, which is not worth it.
2012-08-10add blowfish hash support to cryptRich Felker3-8/+806
there are still some discussions going on about tweaking the code, but at least thing brings us to the point of having something working in the repository. hopefully the remaining major hashes (md5,sha) will follow soon.
2012-08-09fix (hopefully) all hard-coded 8's for kernel sigset_t sizeRich Felker14-20/+31
some minor changes to how hard-coded sets for thread-related purposes are handled were also needed, since the old object sizes were not necessarily sufficient. things have gotten a bit ugly in this area, and i think a cleanup is in order at some point, but for now the goal is just to get the code working on all supported archs including mips, which was badly broken by linux rejecting syscalls with the wrong sigset_t size.
2012-08-09make crypt return an unmatchable hash rather than NULL on failureRich Felker1-5/+2
unfortunately, a large portion of programs which call crypt are not prepared for its failure and do not check that the return value is non-null before using it. thus, always "succeeding" but giving an unmatchable hash is reportedly a better behavior than failing on error. it was suggested that we could do this the same way as other implementations and put the null-to-unmatchable translation in the wrapper rather than the individual crypt modules like crypt_des, but when i tried to do it, i found it was making the logic in __crypt_r for keeping track of which hash type we're working with and whether it succeeded or failed much more complex, and potentially error-prone. the way i'm doing it now seems to have essentially zero cost, anyway.
2012-08-08math: fix exp.s on i386 and x86_64 so the exception flags are correctnsz2-40/+35
exp(inf), exp(-inf), exp(nan) used to raise wrong flags
2012-08-07fix bug dlsym bug that slipped in during dynamic linker cleanupRich Felker1-1/+1
2012-08-05dlsym RTLD_NEXT support for mipsRich Felker1-0/+15
untested
2012-08-05more changes that were lost when committing mips dynamic linkerRich Felker1-0/+4
2012-08-05fix change lost in the process of integrating mips dynamic linkerRich Felker1-2/+2
2012-08-05mips dynamic linker supportRich Felker2-0/+49
not heavily tested, but the basics are working. the basic concept is that the dynamic linker entry point code invokes a pure-PIC (no global accesses) C function in reloc.h to perform the early GOT relocations needed to make the dynamic linker itself functional, then invokes __dynlink like on other archs. since mips uses some ugly arch-specific hacks to optimize relocating the GOT (rather than just using the normal DT_REL[A] tables like on other archs), the dynamic linker has been modified slightly to support calling arch-specific relocation code in reloc.h. most of the actual mips-specific behavior was developed by reading the output of readelf on libc.so and simple executable files. i could not find good reference information on which relocation types need to be supported or their semantics, so it's possible that some legitimate usage cases will not work yet.
2012-08-05more cleanup of dynamic linker internalsRich Felker1-8/+9
2012-08-05more dynamic linker internals cleanupRich Felker1-6/+6
changing the string printed for the dso name is not a regression; the old code was simply using the wrong dso name (head rather than the dso currently being relocated). this will be fixed in a later commit.
2012-08-05dynamic linker internals cleanupRich Felker1-5/+7
2012-08-05floating point support for arm setjmp/longjmpRich Felker2-2/+54
not heavily tested, but at least they don't seem to break anything on soft float targets with or without coprocessors. they check the auxv AT_HWCAP flags to determine which coprocessor, if any, is available.
2012-08-02fix argument type error on wcwidth functionRich Felker1-2/+2
since the correct declaration was not visible, and since the representation of the types wchar_t and wint_t always match, a compiler would have to go out of its way to make this bug manifest, but better to fix it anyway.
2012-08-02fix missing static in getusershell (namespace pollution)Rich Felker1-1/+1
2012-07-31optimize mempcpy to minimize need for data saved across the callRich Felker1-2/+1
2012-07-27optimize arm setjmp/longjmp register saving/loadingRich Felker2-6/+2
the original code was wrongly based on how it would be done in thumb mode, but that's not needed because musl's asm only targets arm.
2012-07-27save AT_HWCAP from auxv for subsequent use in machine-specific codeRich Felker3-0/+4
it's expected that this will be needed/useful only in asm, so I've given it its own symbol that can be addressed in pc-relative ways from asm rather than adding a field in the __libc structure which would require hard-coding the offset wherever it's used.
2012-07-24retry on cas failures in sem_trywaitRich Felker1-2/+2
this seems counter-intuitive since sem_trywait is supposed to just try once, not wait for the semaphore. however, the retry loop is not a wait. instead, it's to handle the case where the value changes due to a simultaneous post or wait from another thread while the semaphore value remains positive. in such a case, it's absolutely wrong for sem_trywait to fail with EAGAIN because the semaphore is not busy.
2012-07-23add ioperm/iopl syscallsRich Felker2-0/+18
based on patches by orc and Isaac Dunham, with some fixes. sys/io.h exists and contains prototypes for these functions regardless of whether the target arch has them; this is a bit unorthodox but I don't think it will break anything. the function definitions do not exist unless the appropriate SYS_* syscall number macro is defined, which should make sure configure scripts looking for these functions don't find them on other systems. presently, sys/io.h does not have the inb/outb/etc. port io macros/functions. I'd be surprised if ioperm/iopl are useful without them, so they probably need to be added at some point in appropriate bits/io.h files...
2012-07-23add splice and vmsplice syscallsRich Felker2-0/+16
based on patches by orc and Isaac Dunham.
2012-07-23add extended attributes syscallsRich Felker1-0/+47
based on patch by orc and Isaac Dunham, with some fixes.
2012-07-23add pipe2 syscallRich Felker1-0/+8
based on patch by orc and Isaac Dunham, with some details fixed.
2012-07-22remove scanf dependency from getaddrinfo /etc/services supportRich Felker1-5/+4
2012-07-22getaddrinfo /etc/services lookup supportRich Felker1-3/+16
2012-07-22add floating point register saving/restoring to mips setjmp/longjmpRich Felker2-1/+29
also fix the alignment of jmp_buf to meet the abi. linux always emulates fpu on mips if it's not present, so enabling this code unconditionally is "safe" but may be slow. in the long term it may be preferable to find a way to disable it on soft float builds.
2012-07-22make getservby*_r return error code rather than -1 (and using errno)Rich Felker2-19/+35
untested but should be correct..
2012-07-21fix logic error for skipping failed interfaces in if_nameindexRich Felker1-8/+7
2012-07-14fix getservby*() with null pointer for protocol argumentRich Felker2-0/+8
not sure this is the best fix but it should work
2012-07-14avoid blx instruction which does not exist on armv4t or armv4Rich Felker1-1/+2
2012-07-13make dynamic linker tell the debugger its own pathnameRich Felker1-0/+5
use the main program's PT_INTERP header if possible, since this is sure to be a correct (and hopefully absolute) pathname.
2012-07-12sigsetjmp asm for mipsRich Felker1-0/+27
2012-07-12workaround another sendmsg kernel bug on 64-bit machinesRich Felker1-0/+13
the kernel wrongly expects the cmsg length field to be size_t instead of socklen_t. in order to work around the issue, we have to impose a length limit and copy to a local buffer. the length limit should be more than sufficient for any real-world use; these headers are only used for passing file descriptors and permissions between processes over unix sockets.
2012-07-12fix several locks that weren't updated right for new futex-based __lockRich Felker4-10/+10
these could have caused memory corruption due to invalid accesses to the next field. all should be fixed now; I found the errors with fgrep -r '__lock(&', which is bogus since the argument should be an array.
2012-07-12fix pthread_kill unlockingRich Felker1-1/+1
it had not been updated for the futex-based locks
2012-07-12fix breakage of x86_64 sigaction from recent changes for mipsRich Felker1-1/+1
2012-07-11fix potential race condition in detached threadsRich Felker2-4/+10
after the thread unmaps its own stack/thread structure, the kernel, performing child tid clear and futex wake, could clobber a new mapping made at the same location as the just-removed thread's tid field. disable kernel clearing of child tid to prevent this.
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