- 11 4月, 2011 1 次提交
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由 Rich Felker 提交于
actually FLT_ROUNDS needs to expand to a static inline function that obtains the current rounding mode and returns it, but that will be added later with fenv.h stuff.
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- 09 4月, 2011 6 次提交
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由 Rich Felker 提交于
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由 Rich Felker 提交于
calling pthread_exit from, or pthread_cancel on, the timer callback thread will no longer destroy the timer.
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由 Rich Felker 提交于
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由 Rich Felker 提交于
according to posix, readv "shall be equivalent to read(), except..." that it places the data into the buffers specified by the iov array. however on linux, when reading from a terminal, each iov element behaves almost like a separate read. this means that if the first iov exactly satisfied the request (e.g. a length-one read of '\n') and the second iov is nonzero length, the syscall will block again after getting the blank line from the terminal until another line is read. simply put, entering a single blank line becomes impossible. the solution, fortunately, is simple. whenever the buffer size is nonzero, reduce the length of the requested read by one byte and let the last byte go through the buffer. this way, readv will already be in the second (and last) iov, and won't re-block on the second iov.
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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- 08 4月, 2011 10 次提交
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由 Rich Felker 提交于
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由 Rich Felker 提交于
POSIX clearly specifies the type of msg_iovlen and msg_controllen, and Linux ignores it and makes them both size_t instead. to work around this we add padding (instead of just using the wrong types like glibc does), but we also need to patch-up the struct before passing it to the kernel in case the caller did not zero-fill it. if i could trust the kernel to just ignore the upper 32 bits, this would not be necessary, but i don't think it will ignore them...
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
previously NULL was returned in ai_canonname, resulting in crashes in some callers. this behavior was incorrect. note however that the new behavior differs from glibc, which performs reverse dns lookups. POSIX is very clear that a reverse DNS lookup must not be performed for numeric addresses.
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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- 07 4月, 2011 13 次提交
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
this is something of a tradeoff, as now set*id() functions, rather than pthread_create, are what pull in the code overhead for dealing with linux's refusal to implement proper POSIX thread-vs-process semantics. my motivations are: 1. it's cleaner this way, especially cleaner to optimize out the rsyscall locking overhead from pthread_create when it's not needed. 2. it's expected that only a tiny number of core system programs will ever use set*id() functions, whereas many programs may want to use threads, and making thread overhead tiny is an incentive for "light" programs to try threads.
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
somehow this worked on my simple fstab, but horribly broke in general, leading to use of uninitialized offset array and crashes.
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由 Rich Felker 提交于
1. make sem_[timed]wait interruptible by signals, per POSIX 2. keep a waiter count in order to avoid unnecessary futex wake syscalls
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- 06 4月, 2011 10 次提交
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由 Rich Felker 提交于
since timer_create is no longer allocating a structure for the timer_t and simply using the kernel timer id, it was impossible to specify the timer_t as the argument to the signal handler. the solution is to pass the null sigevent pointer on to the kernel, rather than filling it in userspace, so that the kernel does the right thing. however, that precludes the clever timerid-versus-threadid encoding we were doing. instead, just assume timerids are below 1M and thread pointers are above 1M. (in perspective: timerids are sequentially allocated and seem limited to 32k, and thread pointers are at roughly 3G.)
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
with these small changes, libc functions which need to call functions which are cancellation points, but which themselves must not be cancellation points, can use the CANCELPT_INHIBIT and CANCELPT_RESUME macros to temporarily inhibit all cancellation.
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由 Rich Felker 提交于
these defs should probably all be moved out of bits and unified...
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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由 Rich Felker 提交于
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