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.
23 lines
862 B
Groff
23 lines
862 B
Groff
.TH io_fd_canwrite 3
|
|
.SH NAME
|
|
io_fd_canwrite \- prepare descriptor for io_wait
|
|
.SH SYNTAX
|
|
.B #include <libowfat/io.h>
|
|
|
|
int \fBio_fd\fP(int64 fd);
|
|
int \fBio_fd_canwrite\fP(int64 fd);
|
|
.SH DESCRIPTION
|
|
io_fd_canwrite is just like io_fd, except that it assumes the descriptor
|
|
is writable, which may save a syscall or two. This assumption is true
|
|
in most cases, because the kernel buffers writes. Noteworthy cases in
|
|
which you need to use io_fd instead of io_fd_canwrite are unconnected
|
|
sockets, i.e. when you queued a non-blocking connect() and want to ask
|
|
for writability to get notified when it went through.
|
|
|
|
It is OK to call this function on a descriptor that io_fd() has already
|
|
been called on.
|
|
.SH "RETURN VALUE"
|
|
io_fd_canwrite returns 1 on success, 0 on error.
|
|
.SH "SEE ALSO"
|
|
io_wait(3), io_wantread(3), io_canread(3), io_eagain(3), io_nonblock(3), io_fd(3)
|