On 01/16/2012 10:08 AM, Luiz Capitulino wrote: >> Strangely enough, POSIX doesn't include strcmp() in its list of >> async-signal-safe functions (which is what you should be restricting >> yourself to, if qemu-ga is multi-threaded), but in practice, I think >> that is a bug of omission in POSIX, and not something you have to change >> in your code. > > memset() ins't either... sigaction() either, which begins to get > annoying.
sigaction() is required by POSIX to be async-signal-safe. Where are you looking when claiming it isn't? memset(), strlen, strcpy, and friends in <string.h> are all in the class of functions that I think are unintentional omissions from the list of async-signal-safe functions (they don't read/modify anything but the pointers passed in, so the _only_ reason I can think of why they _might_ have been omitted from the list is that there might be some machine state that could be observably different if you were interrupted in the middle of one of these operations, such as a processor flag bit when using a rep prefix on x86 controlling which direction to move, but no one has ever pointed me to a definitive answer to why they were omitted). -- Eric Blake ebl...@redhat.com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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