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Document the SF_NODISKIO flag, and fix a small typo.

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silby 2004-02-08 07:38:35 +00:00
parent 9428de17de
commit 3a8a1ad8ce
1 changed files with 10 additions and 2 deletions
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12
lib/libc/sys/sendfile.2
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@ -88,7 +88,11 @@ variable pointed to by
.Pp
The
.Fa flags
argument is currently undefined and should be specified as 0.
argument has one possible value:
.Fa SF_NODISKIO .
This flag causes any sendfile call which would block on disk I/O to instead
return EBUSY. Busy servers may benefit by transferring requests that would
block to a seperate I/O worker thread.
.Pp
When using a socket marked for non-blocking I/O,
.Fn sendfile
@ -137,7 +141,7 @@ for details).
.Pp
The number of
.Xr sendfile 2
buffers in use is determined at boot time by either the
buffers available is determined at boot time by either the
.Va kern.ipc.nsfbufs
.Xr loader.conf 5
variable or the
@ -167,6 +171,10 @@ The
.Fa s
argument
is not a valid socket descriptor.
.It Bq Er EBUSY
Completing the entire transfer would have required disk I/O, so
it was aborted. Partial data may have been sent.
(This error can only occur when SF_NODISKIO is specified.)
.It Bq Er ENOTSOCK
The
.Fa s