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Document EMSGSIZE return from recvmsg due to insufficient free files

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when transfering rights (file descriptors.)
This commit is contained in:
Alfred Perlstein 2004-10-17 07:13:34 +00:00
parent 31d330fb2a
commit af2e24d782
1 changed files with 10 additions and 1 deletions
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11
lib/libc/sys/recv.2
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@ -207,7 +207,9 @@ struct cmsghdr {
.Ed
As an example, one could use this to learn of changes in the data-stream
in XNS/SPP, or in ISO, to obtain user-connection-request data by requesting
a recvmsg with no data buffer provided immediately after an
a
.Fn recvmsg
with no data buffer provided immediately after an
.Fn accept
system call.
.Pp
@ -287,6 +289,13 @@ and
The argument
.Fa s
does not refer to a socket.
.It Bq Er EMSGSIZE
.Fn recvmsg
was used to receive rights (file descriptors) that were in flight on the
connection. However, the receiving program did not have enough free file
descriptor slots to accept the them. In this case the descriptors are
closed, any pending data can be returned by another call to
.Fn recvmsg .
.It Bq Er EAGAIN
The socket is marked non-blocking, and the receive operation
would block, or