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author | jilles <jilles@FreeBSD.org> | 2011-12-14 22:26:39 +0000 |
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committer | jilles <jilles@FreeBSD.org> | 2011-12-14 22:26:39 +0000 |
commit | 5200c1964bcd8905b74260534dc719cfa71cebde (patch) | |
tree | 52674120d1f22b4d3cf93f3c2fceb4ab1105f459 /ObsoleteFiles.inc | |
parent | 6d1299a388490b22f5d0619237868efafa3f3428 (diff) | |
download | FreeBSD-src-5200c1964bcd8905b74260534dc719cfa71cebde.zip FreeBSD-src-5200c1964bcd8905b74260534dc719cfa71cebde.tar.gz |
Fix select/poll/kqueue for write on reverse direction before first write.
The reverse direction of a pipe is lazily allocated on the first write in
that direction (because pipes are usually used in one direction only). A
special case is needed to ensure the pipe appears writable before the first
write because there are 0 bytes of pending data in 0 bytes of buffer space
at that point, leaving 0 bytes of data that can be written with the normal
code.
Note that the first write returns [ENOMEM] if kern.ipc.maxpipekva is
exceeded and does not block or return [EAGAIN], so selecting true for write
is correct even in that case.
PR: kern/93685
Submitted by: gianni
MFC after: 2 weeks
Diffstat (limited to 'ObsoleteFiles.inc')
0 files changed, 0 insertions, 0 deletions