musl - musl - an implementation of the standard library for Linux-based systems

Age	Commit message (Collapse)	Author	Lines
2011-03-24	overhaul cancellation to fix resource leaks and dangerous behavior with signals	Rich Felker	-0/+1
	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...
2011-03-20	global cleanup to use the new syscall interface	Rich Felker	-11/+6

2011-03-19	if returning errno value directly from a syscall, we need to negate it.	Rich Felker	-1/+1

2011-03-19	syscall overhaul part two - unify public and internal syscall interface	Rich Felker	-6/+3
	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.
2011-03-12	misplaced & in times() made it fail to work, and clobber the stack	Rich Felker	-1/+1

2011-03-10	more cancellation points: tcdrain, clock_nanosleep	Rich Felker	-1/+6

2011-03-10	fix errno behavior in clock_* functions	Rich Felker	-3/+0
	these functions are specified inconsistent in whether they're specified to return an error value, or return -1 and set errno. hopefully now they all match what POSIX requires.
2011-02-19	implement the remaining clock_* interfaces	Rich Felker	-0/+36

2011-02-12	initial check-in, version 0.5.0v0.5.0	Rich Felker	-0/+874