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netlink: Make nl_sock_transact() discard reply if 'replyp' is null.

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Sometimes only the success or failure return value is interesting, not the
details of the reply, so this simplifies some callers.
This commit is contained in:
Ben Pfaff
2010-05-19 14:13:23 -07:00
parent 6912370445
commit 8e2093fc18
2 changed files with 16 additions and 8 deletions
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19
lib/netlink.c
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@@ -341,9 +341,12 @@ try_again:
}
/* Sends 'request' to the kernel via 'sock' and waits for a response. If
* successful, stores the reply into '*replyp' and returns 0. The caller is
* responsible for destroying the reply with ofpbuf_delete(). On failure,
* returns a positive errno value and stores a null pointer into '*replyp'.
* successful, returns 0. On failure, returns a positive errno value.
*
* If 'replyp' is nonnull, then on success '*replyp' is set to the kernel's
* reply, which the caller is responsible for freeing with ofpbuf_delete(), and
* on failure '*replyp' is set to NULL. If 'replyp' is null, then the kernel's
* reply, if any, is discarded.
*
* nlmsg_len in 'msg' will be finalized to match msg->size, and nlmsg_pid will
* be set to 'sock''s pid, before the message is sent. NLM_F_ACK will be set
@@ -386,7 +389,9 @@ nl_sock_transact(struct nl_sock *sock,
struct ofpbuf *reply;
int retval;
*replyp = NULL;
if (replyp) {
*replyp = NULL;
}
/* Ensure that we get a reply even if this message doesn't ordinarily call
* for one. */
@@ -425,7 +430,11 @@ recv:
return retval != EAGAIN ? retval : EPROTO;
}
*replyp = reply;
if (replyp) {
*replyp = reply;
} else {
ofpbuf_delete(reply);
}
return 0;
}