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UNIX for Dummies Questions & Answers
Need Some Advice - Best Distro For My System
Post 302763171 by Pyramist on Tuesday 29th of January 2013 04:02:03 PM
01-29-2013
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LEARN ABOUT DEBIAN
io_nonblock
io_nonblock(3) Library Functions Manual io_nonblock(3) NAME
io_nonblock - switch to non-blocking I/O SYNTAX
#include <io.h> void io_nonblock(int64 fd); DESCRIPTION
io_nonblock puts UNIX descriptor fd into ``non-blocking mode.'' Calling io_nonblock(fd) before io_fd(fd) makes io_tryread and io_trywrite faster and more efficient. Actually, current UNIX kernels do not support non-blocking descriptors; they support non-blocking open files. Furthermore, many programs will break if they encounter non-blocking mode. This means that you must not use io_nonblock for a descriptor inherited from another pro- gram. io_nonblock has no return value; it always succeeds. If d is not the number of a UNIX descriptor, io_nonblock has no effect. If io_fd is given a descriptor in blocking mode, io_tryread and io_trywrite go through the following contortions to avoid blocking: 1 Stop if poll says that the descriptor is not ready. Otherwise there's a good chance, but not a guarantee: even if poll says the descrip- tor is ready, the descriptor might not be ready a moment later. (Furthermore, poll can fail on some systems.) 2 Catch SIGALRM. SIGALRM must not be blocked, and must not be used elsewhere in the program. 3 Set an interval timer so that any blocking call will be interrupted by SIGALRM within 10 milliseconds. (Current UNIX kernels do not allow any shorter interval.) Of course, this may still mean a 10-millisecond delay. If io_fd is given a descriptor in non-blocking mode (or a descriptor for a regular disk file), io_tryread and io_trywrite avoid these con- tortions. SEE ALSO
io_wait(3), io_canwrite(3) io_nonblock(3)