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* move accept4, dup3, and pipe2 to non-linux-specific locationsRich Felker2012-09-293-0/+0
| | | | | these interfaces have been adopted by the Austin Group for inclusion in the next version of POSIX.
* emulate SOCK_CLOEXEC and SOCK_NONBLOCK for old (pre-2.6.27) kernelsRich Felker2012-09-292-3/+15
| | | | | | | | | | | | | | | also update syslog to use SOCK_CLOEXEC rather than separate fcntl step, to make it safe in multithreaded programs that run external programs. emulation is not atomic; it could be made atomic by holding a lock on forking during the operation, but this seems like overkill. my goal is not to achieve perfect behavior on old kernels (which have plenty of other imperfect behavior already) but to avoid catastrophic breakage in (1) syslog, which would give no output on old kernels with the change to use SOCK_CLOEXEC, and (2) programs built on a new kernel where configure scripts detected a working SOCK_CLOEXEC, which later get run on older kernels (they may otherwise fail to work completely).
* sem_open should make process-shared semaphoresRich Felker2012-09-291-1/+1
| | | | | this did not matter because we don't yet treat process-shared special. when private futex support is added, however, it will matter.
* use O_CLOEXEC to open semaphore files in sem_openRich Felker2012-09-291-2/+2
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* fix some indention-with-spaces that crept inRich Felker2012-09-294-9/+9
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* microblaze portRich Felker2012-09-2911-0/+188
| | | | | | based on initial work by rdp, with heavy modifications. some features including threads are untested because qemu app-level emulation seems to be broken and I do not have a proper system image for testing.
* fix arm clone syscall bug (no effect unless app uses clone)Rich Felker2012-09-271-2/+1
| | | | | the code to exit the new thread/process after the start function returns was mixed up in its syscall convention.
* optimize strchrnul/strcspn not to scan string twice on no-matchRich Felker2012-09-273-25/+29
| | | | | | | | | when strchr fails, and important piece of information already computed, the string length, is thrown away. have strchrnul (with namespace protection) be the underlying function so this information can be kept, and let strchr be a wrapper for it. this also allows strcspn to be considerably faster in the case where the match set has a single element that's not matched.
* slightly cleaner strlen, also seems to compile to better codeRich Felker2012-09-271-6/+4
| | | | | | | testing with gcc 4.6.3 on x86, -Os, the old version does a duplicate null byte check after the first loop. this is purely the compiler being stupid, but the old code was also stupid and unintuitive in how it expressed the check.
* fix dirname to handle input of form "foo/" correctlyRich Felker2012-09-261-6/+5
| | | | also optimized a bit.
* fix handling of EINTR during close()Rich Felker2012-09-241-1/+4
| | | | | | | | | | austin group interpretation for defect #529 (http://austingroupbugs.net/view.php?id=529) tightens the requirements on close such that, if it returns with EINTR, the file descriptor must not be closed. the linux kernel developers vehemently disagree with this, and will not change it. we catch and remap EINTR to EINPROGRESS, which the standard allows close() to return when the operation was not finished but the file descriptor has been closed.
* fix getaddrinfo to accept port 0 (zero)Rich Felker2012-09-221-2/+2
| | | | | | | | new behavior can be summarized as: inputs that parse completely as a decimal number are treated as one, and rejected only if the result is out of 16-bit range. inputs that do not parse as a decimal number (where strtoul leaves anything left over in the input) are searched in /etc/services.
* fix remaining IPC_64 issue (shmctl)Rich Felker2012-09-222-4/+2
| | | | also cleanup cruft related to the issue
* fix IPC_64 in msgctl tooRich Felker2012-09-222-6/+2
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* fix broken semctl on systems that don't use IPC_64 flagRich Felker2012-09-221-2/+6
| | | | | not tested on mips and arm; they may still be broken. x86_64 should be ok now.
* LFS64 alias for prlimitRich Felker2012-09-211-0/+3
| | | | issue reported/requested by Justin Cormack
* add clock_adjtime, remap_file_pages, and syncfs syscall wrappersRich Felker2012-09-163-0/+25
| | | | patch by Justin Cormack, with slight modification
* add crypt_md5 password hashRich Felker2012-09-152-2/+285
| | | | contributed by nsz
* revert low rounds-count limits in crypt hashesRich Felker2012-09-154-4/+4
| | | | | | | | | | | | | | | it was determined in discussion that these kind of limits are not sufficient to protect single-threaded servers against denial of service attacks from maliciously large round counts. the time scales simply vary too much; many users will want login passwords with rounds counts on a scale that gives decisecond latency, while highly loaded webservers will need millisecond latency or shorter. still some limit is left in place; the idea is not to protect against attacks, but to avoid the runtime of a single call to crypt being, for all practical purposes, infinite, so that configuration errors can be caught and fixed without bringing down whole systems. these limits are very high, on the order of minute-long runtimes for modest systems.
* update mips cancellation-point syscall asm with 7-arg and r25 fixesRich Felker2012-09-151-2/+5
| | | | | these fixes were already made to the normal syscall asm but not the cancellation point version.
* workaround gcc got-register-reload performance problems in mallocRich Felker2012-09-141-4/+8
| | | | | | | with this patch, the malloc in libc.so built with -Os is nearly the same speed as the one built with -O3. thus it solves the performance regression that resulted from removing the forced -O3 when building libc.so; now libc.so can be both small and fast.
* use vfork if possible in posix_spawnRich Felker2012-09-141-1/+3
| | | | | | vfork is implemented as the fork syscall (with no atfork handlers run) on archs where it is not available, so this change does not introduce any change in behavior or regression for such archs.
* asm for memmove on i386 and x86_64Rich Felker2012-09-102-0/+36
| | | | | | | for the sake of simplicity, I've only used rep movsb rather than breaking up the copy for using rep movsd/q. on all modern cpus, this seems to be fine, but if there are performance problems, there might be a need to go back and add support for rep movsd/q.
* fix another ppoll issue (missing sigset_t size argument)Rich Felker2012-09-101-1/+1
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* reenable word-at-at-time copying in memmoveRich Felker2012-09-101-4/+27
| | | | | | | | | before restrict was added, memove called memcpy for forward copies and used a byte-at-a-time loop for reverse copies. this was changed to avoid invoking UB now that memcpy has an undefined copying order, making memmove considerably slower. performance is still rather bad, so I'll be adding asm soon.
* fix ppoll with null timeout argumentRich Felker2012-09-101-2/+2
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* add setdomainname syscall, fix getdomainname (previously a stub)Rich Felker2012-09-092-1/+17
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* mincore syscall wrapperRich Felker2012-09-091-0/+8
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* fix up lfs64 junk for preadv/pwritevRich Felker2012-09-092-2/+2
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* add preadv/pwritev syscall wrappersRich Felker2012-09-092-0/+26
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* add linux ppoll syscall wrapperRich Felker2012-09-091-0/+9
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* reenable sync_file_range; should no longer break on mipsRich Felker2012-09-091-2/+2
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* add 7-arg syscall support for mipsRich Felker2012-09-092-4/+8
| | | | | | | no syscalls actually use that many arguments; the issue is that some syscalls with 64-bit arguments have them ordered badly so that breaking them into aligned 32-bit half-arguments wastes slots with padding, and a 7th slot is needed for the last argument.
* fix mips syscall_cp_asm code (saved register usage)Rich Felker2012-09-091-2/+2
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* fix broken mips syscall asmRich Felker2012-09-091-2/+2
| | | | | | | this code was using $10 to save the syscall number, but $10 is not necessarily preserved by the kernel across syscalls. only mattered for syscalls that got interrupted by a signal and restarted. as far as i can tell, $25 is preserved by the kernel across syscalls.
* disable sync_file_range for nowRich Felker2012-09-081-2/+3
| | | | | | | something is wrong with the logic for the argument layout, resulting in compile errors on mips due to too many args to syscall... further information on how it's supposed to work will be needed before it can be reactivated.
* syscall organization overhaulRich Felker2012-09-081-5/+138
| | | | | | | | | | | | now public syscall.h only exposes __NR_* and SYS_* constants and the variadic syscall function. no macros or inline functions, no __syscall_ret or other internal details, no 16-/32-bit legacy syscall renaming, etc. this logic has all been moved to src/internal/syscall.h with the arch-specific parts in arch/$(ARCH)/syscall_arch.h, and the amount of arch-specific stuff has been reduced to a minimum. changes still need to be reviewed/double-checked. minimal testing on i386 and mips has already been performed.
* add acct syscall source file, omitted in last syscalls commitRich Felker2012-09-081-0/+9
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* add acct, accept4, setns, and dup3 syscalls (linux extensions)Rich Felker2012-09-083-0/+28
| | | | based on patch by Justin Cormack
* add linux tee syscallRich Felker2012-09-081-0/+8
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* add linux sync_file_range syscallRich Felker2012-09-081-0/+16
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* move fallocate syscall wrapper to linux-specific syscalls dirRich Felker2012-09-081-0/+0
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* add linux readahead syscallRich Felker2012-09-081-0/+8
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* add fallocate (nonstandardized) functionRich Felker2012-09-081-0/+9
| | | | | | this is equivalent to posix_fallocate except that it has an extra mode/flags argument to control its behavior, and stores the error in errno rather than returning an error code.
* fix broken fallocate syscall in posix_fallocateRich Felker2012-09-081-1/+1
| | | | | the syscall takes an extra flag argument which should be zero to meet the POSIX requirements.
* add timerfd interfaces (untested)Rich Felker2012-09-081-0/+17
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* cleanup src/linux and src/misc trees, etc.Rich Felker2012-09-0745-98/+74
| | | | | | | | | | | | previously, it was pretty much random which one of these trees a given function appeared in. they have now been organized into: src/linux: non-POSIX linux syscalls (possibly shard with other nixen) src/legacy: various obsolete/legacy functions, mostly wrappers src/misc: still mostly uncategorized; some misc POSIX, some nonstd src/crypt: crypt hash functions further cleanup will be done later.
* fix constraint violation in ftwRich Felker2012-09-061-1/+4
| | | | void* does not implicitly convert to function pointer types.
* further use of _Noreturn, for non-plain-C functionsRich Felker2012-09-066-10/+10
| | | | | | | | | | | | | | | | | | | note that POSIX does not specify these functions as _Noreturn, because POSIX is aligned with C99, not the new C11 standard. when POSIX is eventually updated to C11, it will almost surely give these functions the _Noreturn attribute. for now, the actual _Noreturn keyword is not used anyway when compiling with a c99 compiler, which is what POSIX requires; the GCC __attribute__ is used instead if it's available, however. in a few places, I've added infinite for loops at the end of _Noreturn functions to silence compiler warnings. presumably __buildin_unreachable could achieve the same thing, but it would only work on newer GCCs and would not be portable. the loops should have near-zero code size cost anyway. like the previous _Noreturn commit, this one is based on patches contributed by philomath.
* fix invalid implicit pointer conversion in gnulib-compat functionsRich Felker2012-09-061-1/+1
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