io_timeout(3) Library Functions Manual io_timeout(3)NAME
io_timeout - set time limit on descriptor
SYNTAX
#include <io.h>
void io_timeout(int64 fd,tai6464 deadline);
DESCRIPTION
The io library keeps track of an optional ``timeout'' for each descriptor. The timeout is a specific moment in time, stored in a tai6464
variable.
io_timeout(d,t) sets the timeout for descriptor d to t.
io_timeout has no return value; it always succeeds. (Space to store the timeout was already allocated as part of the descriptor.) It has no
effect if d is not the number of a descriptor.
Note that you have to call io_timeouted to be notified of timeouts, just like you are calling io_canread or io_canwrite for read and write
notification.
SEE ALSO io_waituntil(3), io_timeouted(3)io_timeout(3)
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io_wait(3) Library Functions Manual io_wait(3)NAME
io_wait - wait for events
SYNTAX
#include <io.h>
void io_wait();
DESCRIPTION
io_wait() checks the descriptors that the program is interested in to see whether any of them are ready. If none of them are ready,
io_wait() tries to pause until one of them is ready, so that it does not take time away from other programs running on the same computer.
io_wait pays attention to timeouts: if a descriptor reaches its timeout, and the program is interested in reading or writing that descrip-
tor, io_wait will return promptly.
Under some circumstances, io_wait will return even though no interesting descriptors are ready. Do not assume that a descriptor is ready
merely because io_wait has returned.
io_wait is not interrupted by the delivery of a signal. Programs that expect interruption are unreliable: they will block if the same sig-
nal is delivered a moment before io_wait. The correct way to handle signals is with the self-pipe trick.
SEE ALSO io_waituntil(3), io_check(3), io_wantread(3), io_wantwrite(3), io_fd(3)io_wait(3)
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