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document return values correctly

master
Felix von Leitner 2004-03-06 10:27:44 +00:00
parent b2b30bdbd3
commit 1f7895e25c
1 changed files with 3 additions and 1 deletions
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4
io/io_fd.3
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@ -4,7 +4,7 @@ io_fd \- prepare descriptor for io_wait
.SH SYNTAX
.B #include <io.h>
void \fBio_fd\fP(int64 fd);
int \fBio_fd\fP(int64 fd);
.SH DESCRIPTION
If you want to use io_canread() and io_canwrite() on a descriptor, you
have to use io_wait() on it first, and io_wait() has to know which
@ -15,5 +15,7 @@ io_pipe and io_socketpair already call io_fd for you.
Waiting on descriptors only works for sockets, fifos and pipes. It may
also work on devices and TTYs, but that is platform dependent -- you
should not rely on that. It does not work on files.
.SH "RETURN VALUE"
io_fd 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)