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* overhaul cancellation to fix resource leaks and dangerous behavior with signalsRich Felker2011-03-241-0/+3
| | | | | | | | | | | | | | | | | | | | | | | | | | | | 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...
* 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 Felker2011-03-193-115/+69
| | | | | | | | | | | | | | | | 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.
* overhaul syscall interfaceRich Felker2011-03-192-313/+635
| | | | | | | | | | | | | | | 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.
* various legacy and linux-specific stuffRich Felker2011-03-181-0/+1
| | | | | this commit is part of an effort to make more of busybox work out-of-the-box.
* optimize contended normal mutex case; add int compare-and-swap atomicRich Felker2011-03-171-0/+7
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* match dimensions so we can use all slots without invoking OOB-array-accessRich Felker2011-03-111-5/+5
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* fix missing ENOTSUP error codeRich Felker2011-03-111-0/+1
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* make sigaltstack work (missing macros in signal.h, error conditions)Rich Felker2011-03-101-0/+2
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* fill in some missing siginfo stuff in signal.hRich Felker2011-02-201-5/+56
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* add missing WIFCONTINUED macro and improve WIFSIGNALEDRich Felker2011-02-191-1/+2
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* support the ugly and deprecated ucontext and sigcontext header stuff...Rich Felker2011-02-181-0/+32
| | | | | | | | | | | | | | 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...
* reorganize pthread data structures and move the definitions to alltypes.hRich Felker2011-02-171-0/+15
| | | | | | | | 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.
* move stdio stuff that's not arch-specific out of bitsRich Felker2011-02-151-10/+0
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* protect some limit constants with feature test macros on x86_64Rich Felker2011-02-151-1/+3
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* fix the types of some integer constant limits in headersRich Felker2011-02-151-2/+2
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* fix directory reading on x86_64Rich Felker2011-02-151-0/+2
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* fix x86_64 wrongly reporting itself as ILP32 instead of LP64Rich Felker2011-02-151-2/+2
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* remove standalone syscall cruftRich Felker2011-02-151-11/+1
| | | | | | | | | | | this was originally written for an early draft of the library where non-standard functions would reside in a static library separate from the shared libc.so, which would implement a pure standard. the idea was not to depend on an implementation-dependent __syscall_ret function in the main libc. but it turned out to be better to put everything in a single library for both static and dynamic linking uses, and thus the (incomplete) remnants of this feature were just enlarging the source and binary.
* fix some type leakage (timer_t) from x86_64 commitRich Felker2011-02-152-2/+2
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* Optimize x86_64 atomics to take advantage of 64-bitness.Nicholas J. Kain2011-02-151-9/+8
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* Remove __syscall_lseek from x86_64 syscall.h.Nicholas J. Kain2011-02-151-8/+0
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* Update x86_64 bits to mirror (modulo platform differences) the latest changesNicholas J. Kain2011-02-155-15/+20
| | | | to i386.
* Port musl to x86-64. One giant commit!Nicholas J. Kain2011-02-1532-0/+2067