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recvmsg: control msg support multi-attribute return

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adapts to third-party code compilation. in the process of porting ConnMan,
multiple control message options are enabled, such as IPV6_RECVPKTINFO and
IPV6_RECVHOPLIMIT, so I changed the Filling implementation of the control
message.

Signed-off-by: zhanghongyu <zhanghongyu@xiaomi.com>
This commit is contained in:
zhanghongyu
2023-04-20 12:15:24 +08:00
committed by Alin Jerpelea
parent bac304afc0
commit c288752bef
7 changed files with 164 additions and 68 deletions
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18
net/socket/recvmsg.c
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@@ -69,6 +69,10 @@
ssize_t psock_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg,
int flags)
{
unsigned long msg_controllen;
FAR void *msg_control;
int ret;
/* Verify that non-NULL pointers were passed */
if (msg == NULL || msg->msg_iov == NULL || msg->msg_iov->iov_base == NULL)
@@ -100,7 +104,19 @@ ssize_t psock_recvmsg(FAR struct socket *psock, FAR struct msghdr *msg,
DEBUGASSERT(psock->s_sockif != NULL &&
psock->s_sockif->si_recvmsg != NULL);
return psock->s_sockif->si_recvmsg(psock, msg, flags);
/* Save the original cmsg information */
msg_control = msg->msg_control;
msg_controllen = msg->msg_controllen;
ret = psock->s_sockif->si_recvmsg(psock, msg, flags);
/* Recover the pointer and calculate the cmsg's true data length */
msg->msg_control = msg_control;
msg->msg_controllen = msg_controllen - msg->msg_controllen;
return ret;
}
/****************************************************************************