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nl: Provide API to specify the default buffer size when receiving netlink messages

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New functions:
  nl_socket_set_msg_buf_size(sk, size)
  nl_socket_get_msg_buf_size(sk)

Default remains getpagesize()

Signed-off-by: Thomas Graf <tgraf@redhat.com>
This commit is contained in:
Thomas Graf 2012-10-09 16:15:08 +02:00
parent 72c2cb9e29
commit e4192ff97f
4 changed files with 34 additions and 1 deletions
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1
include/netlink-types.h
View File

@ -69,6 +69,7 @@ struct nl_sock
unsigned int s_seq_expect;
int s_flags;
struct nl_cb * s_cb;
size_t s_bufsize;
};
struct nl_cache

2
include/netlink/socket.h
View File

@ -49,6 +49,8 @@ extern int nl_socket_modify_err_cb(struct nl_sock *, enum nl_cb_kind,
nl_recvmsg_err_cb_t, void *);
extern int nl_socket_set_buffer_size(struct nl_sock *, int, int);
extern int nl_socket_set_msg_buf_size(struct nl_sock *, size_t);
extern size_t nl_socket_get_msg_buf_size(struct nl_sock *);
extern int nl_socket_set_passcred(struct nl_sock *, int);
extern int nl_socket_recv_pktinfo(struct nl_sock *, int);

2
lib/nl.c
View File

@ -447,7 +447,7 @@ int nl_recv(struct nl_sock *sk, struct sockaddr_nl *nla,
if (page_size == 0)
page_size = getpagesize();
iov.iov_len = page_size;
iov.iov_len = sk->s_bufsize ? : page_size;
iov.iov_base = *buf = malloc(iov.iov_len);
if (sk->s_flags & NL_SOCK_PASSCRED) {

30
lib/socket.c
View File

@ -586,6 +586,36 @@ int nl_socket_set_buffer_size(struct nl_sock *sk, int rxbuf, int txbuf)
return 0;
}
/**
* Set default message buffer size of netlink socket.
* @arg sk Netlink socket.
* @arg bufsize Default message buffer size in bytes.
*
* Sets the default message buffer size to the specified length in bytes.
* The default message buffer size limits the maximum message size the
* socket will be able to receive. It is generally recommneded to specify
* a buffer size no less than the size of a memory page.
*
* @return 0 on success or a negative error code.
*/
int nl_socket_set_msg_buf_size(struct nl_sock *sk, size_t bufsize)
{
sk->s_bufsize = bufsize;
return 0;
}
/**
* Get default message buffer size of netlink socket.
* @arg sk Netlink socket.
*
* @return Size of default message buffer.
*/
size_t nl_socket_get_msg_buf_size(struct nl_sock *sk)
{
return sk->s_bufsize;
}
/**
* Enable/disable credential passing on netlink socket.
* @arg sk Netlink socket.