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* revert some more spin optimizations that turned out to be pessimizationsRich Felker2011-03-283-4/+3
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* fix bug from syscall overhaul: extra __syscall_ret call for 0-arg syscallsRich Felker2011-03-281-1/+1
| | | | | this mainly just caused bloat, but could corrupt errno if a 0-arg syscall ever failed.
* fix broken spinlock due to miscompilationRich Felker2011-03-281-1/+1
| | | | actually this trick also seems to have made the uncontended case slower.
* prototype for getpassRich Felker2011-03-281-0/+4
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* remove useless field in pthread struct (wasted a good bit of space)Rich Felker2011-03-281-1/+0
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* fix getc - the classic error of trying to store EOF+0-255 in a char type..Rich Felker2011-03-281-3/+3
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* major stdio overhaul, using readv/writev, plus other changesRich Felker2011-03-2837-281/+258
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | the biggest change in this commit is that stdio now uses readv to fill the caller's buffer and the FILE buffer with a single syscall, and likewise writev to flush the FILE buffer and write out the caller's buffer in a single syscall. making this change required fundamental architectural changes to stdio, so i also made a number of other improvements in the process: - the implementation no longer assumes that further io will fail following errors, and no longer blocks io when the error flag is set (though the latter could easily be changed back if desired) - unbuffered mode is no longer implemented as a one-byte buffer. as a consequence, scanf unreading has to use ungetc, to the unget buffer has been enlarged to hold at least 2 wide characters. - the FILE structure has been rearranged to maintain the locations of the fields that might be used in glibc getc/putc type macros, while shrinking the structure to save some space. - error cases for fflush, fseek, etc. should be more correct. - library-internal macros are used for getc_unlocked and putc_unlocked now, eliminating some ugly code duplication. __uflow and __overflow are no longer used anywhere but these macros. switch to read or write mode is also separated so the code can be better shared, e.g. with ungetc. - lots of other small things.
* match glibc/lsb cancellation abi on i386Rich Felker2011-03-258-0/+57
| | | | | | | | glibc made the ridiculous choice to use pass-by-register calling convention for these functions, which is impossible to duplicate directly on non-gcc compilers. instead, we use ugly asm to wrap and convert the calling convention. presumably this works with every compiler anyone could potentially want to use.
* remove -Wno-pointer-sign example from dist/config.makRich Felker2011-03-251-1/+0
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* fix all implicit conversion between signed/unsigned pointersRich Felker2011-03-2519-48/+44
| | | | | | | sadly the C language does not specify any such implicit conversion, so this is not a matter of just fixing warnings (as gcc treats it) but actual errors. i would like to revisit a number of these changes and possibly revise the types used to reduce the number of casts required.
* simplify and optimize FILE lock handlingRich Felker2011-03-245-14/+14
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* prepare pthread_spin_unlock for archs that need memory barriersRich Felker2011-03-241-1/+2
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* optimize contended case for pthread_spin_trylockRich Felker2011-03-241-1/+2
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* optimize spinlock spinRich Felker2011-03-241-1/+1
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* fix non-atomicity of putsRich Felker2011-03-241-1/+5
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* overhaul cancellation to fix resource leaks and dangerous behavior with signalsRich Felker2011-03-2414-13/+49
| | | | | | | | | | | | | | | | | | | | | | | | | | | | this commit addresses two issues: 1. a race condition, whereby a cancellation request occurring after a syscall returned from kernelspace but before the subsequent CANCELPT_END would cause cancellable resource-allocating syscalls (like open) to leak resources. 2. signal handlers invoked while the thread was blocked at a cancellation point behaved as if asynchronous cancellation mode wer in effect, resulting in potentially dangerous state corruption if a cancellation request occurs. the glibc/nptl implementation of threads shares both of these issues. with this commit, both are fixed. however, cancellation points encountered in a signal handler will not be acted upon if the signal was received while the thread was already at a cancellation point. they will of course be acted upon after the signal handler returns, so in real-world usage where signal handlers quickly return, it should not be a problem. it's possible to solve this problem too by having sigaction() wrap all signal handlers with a function that uses a pthread_cleanup handler to catch cancellation, patch up the saved context, and return into the cancellable function that will catch and act upon the cancellation. however that would be a lot of complexity for minimal if any benefit...
* very cheap double-free checks in mallocRich Felker2011-03-231-0/+4
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* global cleanup to use the new syscall interfaceRich Felker2011-03-20160-238/+180
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* if returning errno value directly from a syscall, we need to negate it.Rich Felker2011-03-193-3/+3
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* honor namespace for i386 syscall.h, even though it's not a standard headerRich Felker2011-03-191-50/+50
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* fix typo in x86_64 part of syscall overhaulRich Felker2011-03-191-1/+1
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* syscall overhaul part two - unify public and internal syscall interfaceRich Felker2011-03-1926-316/+275
| | | | | | | | | | | | | | | | with this patch, the syscallN() functions are no longer needed; a variadic syscall() macro allows syscalls with anywhere from 0 to 6 arguments to be made with a single macro name. also, manually casting each non-integer argument with (long) is no longer necessary; the casts are hidden in the macros. some source files which depended on being able to define the old macro SYSCALL_RETURNS_ERRNO have been modified to directly use __syscall() instead of syscall(). references to SYSCALL_SIGSET_SIZE and SYSCALL_LL have also been changed. x86_64 has not been tested, and may need a follow-up commit to fix any minor bugs/oversights.
* remove comment cruft that got left behind in x86_64 syscall.sRich Felker2011-03-191-1/+0
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* add some ioctl stuff to sys/mount.hRich Felker2011-03-191-0/+18
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* overhaul syscall interfaceRich Felker2011-03-1911-749/+1577
| | | | | | | | | | | | | | | this commit shuffles around the location of syscall definitions so that we can make a syscall() library function with both SYS_* and __NR_* style syscall names available to user applications, provides the syscall() library function, and optimizes the code that performs the actual inline syscalls in the library itself. previously on i386 when built as PIC (shared library), syscalls were incurring bus lock (lock prefix) overhead at entry and exit, due to the way the ebx register was being loaded (xchg instruction with a memory operand). now the xchg takes place between two registers. further cleanup to arch/$(ARCH)/syscall.h is planned.
* some linux headers useful from user apps.Rich Felker2011-03-183-0/+550
| | | | | | | i'm still not sure whether it's a good idea to include or use any of these, but i'll add them for now. it may make more sense to just add official kernel headers to the include path for compiling programs that need them.
* various legacy and linux-specific stuffRich Felker2011-03-187-1/+122
| | | | | this commit is part of an effort to make more of busybox work out-of-the-box.
* document changes for 0.7.1 v0.7.1Rich Felker2011-03-181-0/+9
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* implement [v]swprintfRich Felker2011-03-184-3/+63
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* implement wprintf family of functionsRich Felker2011-03-174-0/+387
| | | | | | | | | this implementation is extremely ugly and inefficient, but it avoids a good deal of code duplication and bloat. it may be cleaned up later to eliminate the remaining code duplication and some of the warts, but i don't really care about its performance. note that swprintf is not yet implemented.
* fix broken wmemchr (unbounded search)Rich Felker2011-03-171-1/+1
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* implement robust mutexesRich Felker2011-03-1710-10/+84
| | | | | | some of this code should be cleaned up, e.g. using macros for some of the bit flags, masks, etc. nonetheless, the code is believed to be working and correct at this point.
* avoid function call to pthread_self in mutex unlockRich Felker2011-03-171-1/+1
| | | | | | if the mutex was previously locked, we can assume pthread_self was already called at the time of locking, and thus that the thread pointer is initialized.
* reorder mutex struct fields to make room for pointers (upcoming robust mutexes)Rich Felker2011-03-171-1/+3
| | | | | | the layout has been chosen so that pointer slots 3 and 4 fit between the integer slots on 32-bit archs, and come after the integer slots on 64-bit archs.
* unify lock and owner fields of mutex structureRich Felker2011-03-174-8/+6
| | | | | | this change is necessary to free up one slot in the mutex structure so that we can use doubly-linked lists in the implementation of robust mutexes.
* optimize contended normal mutex case; add int compare-and-swap atomicRich Felker2011-03-173-1/+15
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* simplify logic, slightly optimize contended case for non-default mutex typesRich Felker2011-03-161-4/+2
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* correct error returns for error-checking mutexesRich Felker2011-03-162-2/+6
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* cut out a syscall on thread creation in the case where guard size is 0Rich Felker2011-03-161-1/+1
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* don't expose EAGAIN, etc. from timed futex wait to callerRich Felker2011-03-161-1/+4
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* optimize file locking: avoid cache-polluting writes to global storageRich Felker2011-03-162-3/+5
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* partially-written draft of fmemopen, still in #if 0Rich Felker2011-03-141-3/+48
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* remove some old cruft from sys/types.hRich Felker2011-03-141-1/+0
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* misplaced & in times() made it fail to work, and clobber the stackRich Felker2011-03-121-1/+1
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* implement flockfile api, rework stdio lockingRich Felker2011-03-129-15/+66
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* pthread.h needs clockid_tRich Felker2011-03-121-0/+1
| | | | | actually it gets this from time.h if _POSIX_C_SOURCE or any other feature test macros are defined, but it breaks if they're not.
* document some additional important changes v0.7.0Rich Felker2011-03-111-1/+2
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* update whatsnew file for release of 0.7.0Rich Felker2011-03-111-2/+4
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* match dimensions so we can use all slots without invoking OOB-array-accessRich Felker2011-03-112-10/+10
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* implement dummy pthread_attr_[gs]etschedparam functionsRich Felker2011-03-112-0/+14
| | | | | | | | for some reason these functions are not shaded by the PS/TPS option in POSIX, so presumably they are mandatory, even though the functionality they offer is optional. for now, provide them in case any programs depend on their existence, but disallow any priority except the default.