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net/local: Support SO_SNDBUF option in getsockopt

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For datagram unix sockets, the `SO_SNDBUF` value imposes an upper limit on the size of outgoing datagrams.

Note: We don't support to change the buffer size yet, so only add support to getsockopt now.
Refs: https://man7.org/linux/man-pages/man7/unix.7.html

Signed-off-by: Zhe Weng <wengzhe@xiaomi.com>
This commit is contained in:
Zhe Weng 2023-10-24 17:41:14 +08:00 committed by Xiang Xiao
parent 5374af077b
commit 9ef2a48919
3 changed files with 29 additions and 10 deletions
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2
net/local/local.h
View File

@ -49,6 +49,8 @@
#define LOCAL_NPOLLWAITERS 2
#define LOCAL_NCONTROLFDS 4
#define LOCAL_SEND_LIMIT (CONFIG_DEV_FIFO_SIZE - sizeof(uint16_t))
/****************************************************************************
* Public Type Definitions
****************************************************************************/

2
net/local/local_sendpacket.c
View File

@ -130,7 +130,7 @@ int local_send_packet(FAR struct file *filep, FAR const struct iovec *buf,
len16 += iov->iov_len;
}
if (len16 > CONFIG_DEV_FIFO_SIZE - sizeof(uint16_t))
if (len16 > LOCAL_SEND_LIMIT)
{
nerr("ERROR: Packet is too big: %d\n", len16);
return -EMSGSIZE;

35
net/local/local_sockif.c
View File

@ -562,20 +562,37 @@ static int local_getsockopt(FAR struct socket *psock, int level, int option,
{
DEBUGASSERT(psock->s_domain == PF_LOCAL);
#ifdef CONFIG_NET_LOCAL_SCM
if (level == SOL_SOCKET && option == SO_PEERCRED)
if (level == SOL_SOCKET)
{
FAR struct local_conn_s *conn = psock->s_conn;
if (*value_len != sizeof(struct ucred))
switch (option)
{
return -EINVAL;
}
#ifdef CONFIG_NET_LOCAL_SCM
case SO_PEERCRED:
{
FAR struct local_conn_s *conn = psock->s_conn;
if (*value_len != sizeof(struct ucred))
{
return -EINVAL;
}
memcpy(value, &conn->lc_peer->lc_cred, sizeof(struct ucred));
return OK;
}
memcpy(value, &conn->lc_peer->lc_cred, sizeof(struct ucred));
return OK;
}
#endif
case SO_SNDBUF:
{
if (*value_len != sizeof(int))
{
return -EINVAL;
}
*(FAR int *)value = LOCAL_SEND_LIMIT;
return OK;
}
}
}
return -ENOPROTOOPT;
}