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.TH iob_send 3
iob_send \- send I/O batch
.B #include <iob.h>
int64 \fBiob_send\fP(int64 s,io_batch* b);
iob_send sends the (rest of) \fIb\fR over the socket \fIs\fR.
iob_send 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 permanent
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_send 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 and
close the socket.
The benefit of the I/O batch API is that it exploits platform specific
APIs like FreeBSD's sendfile. The file contents will always be sent in
a way that allows the operating systems to perform zero copy TCP, and
the buffers will always be sent using as few syscalls as possible and
avoiding unnecessary copying (using writev).
iob_reset(3), iob_send(3), iob_addbuf(3), iob_adds_free(3), iob_addfile(3),