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Date: Fri, 1 Aug 2014 23:31:22 +0200
From: Karoly Kemeny <karoly.kemeny@...il.com>
To: netdev@...r.kernel.org, davem@...emloft.net,
linux-doc@...r.kernel.org
Cc: Karoly Kemeny <karoly.kemeny@...il.com>
Subject: [PATCH 1/2] net: socket.h structures documentation
Signed-off-by: Karoly Kemeny <karoly.kemeny@...il.com>
---
include/linux/socket.h | 78 ++++++++++++++++++++++++++++++++++++--------------
1 file changed, 57 insertions(+), 21 deletions(-)
diff --git a/include/linux/socket.h b/include/linux/socket.h
index ec538fc..18c225a 100644
--- a/include/linux/socket.h
+++ b/include/linux/socket.h
@@ -25,15 +25,27 @@ typedef __kernel_sa_family_t sa_family_t;
/*
* 1003.1g requires sa_family_t and that sa_data is char.
*/
-
+
+/**
+ * struct sockaddr - A common base for address structures
+ * @sa_family: address family, AF_xxx
+ * @sa_data: 14 bytes of protocol address
+ */
+
struct sockaddr {
- sa_family_t sa_family; /* address family, AF_xxx */
- char sa_data[14]; /* 14 bytes of protocol address */
+ sa_family_t sa_family;
+ char sa_data[14];
};
+/**
+ * struct linger - Linger options on socket closing
+ * @l_onoff: Linger active
+ * @l_linger: How long to linger for
+ */
+
struct linger {
- int l_onoff; /* Linger active */
- int l_linger; /* How long to linger for */
+ int l_onoff;
+ int l_linger;
};
#define sockaddr_storage __kernel_sockaddr_storage
@@ -43,33 +55,53 @@ struct linger {
* system, not 4.3. Thus msg_accrights(len) are now missing. They
* belong in an obscure libc emulation or the bin.
*/
-
+
+/**
+ * struct msghdr - Includes the data blocks to send or to fill for
+ * sendmsg() and recvmsg(), and some other parameters
+ * @msg_name: ptr to socket address structure
+ * @msg_namelen: size of socket address structure
+ * @msg_iov: scatter/gather array
+ * @msg_iovlen: number of elements in msg_iov
+ * @msg_control: ancillary data
+ * @msg_controllen: ancillary data buffer length
+ * @msg_flags: flags on received message
+ */
+
struct msghdr {
- void *msg_name; /* ptr to socket address structure */
- int msg_namelen; /* size of socket address structure */
- struct iovec *msg_iov; /* scatter/gather array */
- __kernel_size_t msg_iovlen; /* # elements in msg_iov */
- void *msg_control; /* ancillary data */
- __kernel_size_t msg_controllen; /* ancillary data buffer length */
- unsigned int msg_flags; /* flags on received message */
+ void *msg_name;
+ int msg_namelen;
+ struct iovec *msg_iov;
+ __kernel_size_t msg_iovlen;
+ void *msg_control;
+ __kernel_size_t msg_controllen;
+ unsigned int msg_flags;
};
-/* For recvmmsg/sendmmsg */
+/**
+ * struct mmsghdr - wrapper for recvmmsg/sendmmsg
+ * @msg_hdr: the real message header embedded
+ * @msg_len: length of the message header
+ */
+
struct mmsghdr {
struct msghdr msg_hdr;
unsigned int msg_len;
};
-/*
- * POSIX 1003.1g - ancillary data object information
- * Ancillary data consits of a sequence of pairs of
- * (cmsghdr, cmsg_data[])
+/**
+ * struct cmsghdr - POSIX 1003.1g - ancillary data object information
+ * Ancillary data consists of a sequence of pairs of
+ * (cmsghdr, cmsg_data[])
+ * @cmsg_len: data byte count, including hdr
+ * @cmsg_level: originating protocol
+ * @cmsg_type: protocol specific type
*/
struct cmsghdr {
- __kernel_size_t cmsg_len; /* data byte count, including hdr */
- int cmsg_level; /* originating protocol */
- int cmsg_type; /* protocol-specific type */
+ __kernel_size_t cmsg_len;
+ int cmsg_level;
+ int cmsg_type;
};
/*
@@ -131,6 +163,10 @@ static inline struct cmsghdr * cmsg_nxthdr (struct msghdr *__msg, struct cmsghdr
#define SCM_CREDENTIALS 0x02 /* rw: struct ucred */
#define SCM_SECURITY 0x03 /* rw: security label */
+/**
+ * struct ucred - credentials represented an a struct in the ancilliary message
+ */
+
struct ucred {
__u32 pid;
__u32 uid;
--
1.9.1
--
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