You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
|
|
|
|
.TH iob_send 3
|
|
|
|
|
.SH NAME
|
|
|
|
|
iob_send \- send I/O batch
|
|
|
|
|
.SH SYNTAX
|
|
|
|
|
.B #include <iob.h>
|
|
|
|
|
|
|
|
|
|
int64 \fBiob_send\fP(int64 s,io_batch* b);
|
|
|
|
|
.SH DESCRIPTION
|
|
|
|
|
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).
|
|
|
|
|
.SH "SEE ALSO"
|
|
|
|
|
iob_reset(3), iob_send(3), iob_addbuf(3), iob_adds_free(3), iob_addfile(3),
|
|
|
|
|
iob_prefetch(3)
|
