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Give some information on SF_MNOWAIT flag.

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MFC after:	3 days
This commit is contained in:
Konstantin Belousov 2010-01-07 13:31:00 +00:00
parent ca5f8016e3
commit 0b56296772
1 changed files with 10 additions and 2 deletions
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12
lib/libc/sys/sendfile.2
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@ -116,9 +116,17 @@ Busy servers may benefit by transferring requests that would
block to a separate I/O worker thread.
.It
.Dv SF_MNOWAIT .
(description missing)
Do not wait for some kernel resource to become available,
in particular,
.Vt mbuf
and
.Vt sf_buf .
The flag does not make the
.Fn sendfile
syscall trully non-blocking, since other resources are still allocated
in blocking fashion.
.It
.Dv SF_SYNC ,
.Dv SF_SYNC .
.Nm
sleeps until the network stack no longer references the VM pages
of the file, making subsequent modifications to it safe.