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io_wait(3) [debian man page]

io_wait(3)						     Library Functions Manual							io_wait(3)

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)

Check Out this Related Man Page

iob_write(3)						     Library Functions Manual						      iob_write(3)

iob_write - send I/O batch through callback SYNTAX
#include <iob.h> typedef int64 (*io_write_callback)(int64 s,const void* buf,uint64 n); int64 iob_write(int64 s,io_batch* b,io_write_callback cb); DESCRIPTION
iob_write sends the (rest of) b through the callback cb, passing s as first argument. cb is expected to behave like io_trywrite(2). This interface is intended to send an I/O batch through a filter, for example to encrypt or compress it. If you just want to send an I/O batch to a socket, use iob_send instead. iob_write returns the number of bytes written, 0 if there were no more bytes to be written in the batch, -1 for EAGAIN, or -3 for a perma- nent error (for example "connection reset by peer"). The normal usage pattern is using io_wait to know when a descriptor is writable, and then calling iob_write until it returns 0, -1 or -3. If it returns 0, terminate the loop (everything was written OK). If it returns -1, call io_wait again. If it returned -3, signal an error. NOTE
iob_write will continue to call your callback until it returns an error. So if you are in a state machine, for example a web server using this for SSL support, make sure to write at most n bytes at a time (e.g. 64k) and the next time you are called return -1. Otherwise iob_write might not return until the whole file is served. SEE ALSO
iob_send(3) iob_write(3)
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