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| author | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-09-25 12:09:09 +0200 |
|---|---|---|
| committer | Michael Kerrisk <mtk.manpages@gmail.com> | 2016-09-25 12:09:09 +0200 |
| commit | 2293a55f93080704fe059b87f2f6c1cdca99721e (patch) | |
| tree | 46cbfdfb44ffb0ad54fcc0e0bc2927f8ecedfc3f | |
| parent | 8512495a12f37fa5e38836b4a3efc0252e77328a (diff) | |
| download | man-pages-2293a55f93080704fe059b87f2f6c1cdca99721e.tar.gz | |
pipe.7: Document FIONREAD
Reported-by: Patrick McLean <patrickm@gaikai.com>
Signed-off-by: Michael Kerrisk <mtk.manpages@gmail.com>
| -rw-r--r-- | man7/pipe.7 | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/man7/pipe.7 b/man7/pipe.7 index 9977acc3bc..b6a300742a 100644 --- a/man7/pipe.7 +++ b/man7/pipe.7 @@ -143,6 +143,21 @@ operations. See .BR fcntl (2) for more information. + +The following +.BR ioctl (2) +operation, which can be applied to a file descriptor +that refers to either end of a pipe, +places a count of the number of unread bytes in the pipe in the +.I int +buffer pointed to by the final argument of the call: + + ioctl(fd, FIONREAD, &nbytes); + +The +.B FIONREAD +operation is not specified in any standard, +but is provided on many implementations. .\" .SS PIPE_BUF POSIX.1 says that |