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ibs/libc/net: Add basic implementation for recvmsg and sendmsg per OpenGroup.org specification.

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This commit is contained in:
ligd
2018-11-09 11:39:05 -06:00
committed by Gregory Nutt
parent b8b90b5c4f
commit 4a8b750ecd
4 changed files with 245 additions and 1 deletions
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include/sys/socket.h
+66
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@@ -42,6 +42,7 @@
****************************************************************************/
#include <sys/types.h>
#include <sys/uio.h>
/****************************************************************************
* Pre-processor Definitions
@@ -228,6 +229,25 @@
# define SOMAXCONN 0
#endif
/* Definitions associated with sendmsg/recvmsg */
#define CMSG_NXTHDR(mhdr, cmsg) cmsg_nxthdr((mhdr), (cmsg))
#define CMSG_ALIGN(len) \
(((len)+sizeof(long)-1) & ~(sizeof(long)-1))
#define CMSG_DATA(cmsg) \
((void *)((char *)(cmsg) + CMSG_ALIGN(sizeof(struct cmsghdr))))
#define CMSG_SPACE(len) \
(CMSG_ALIGN(sizeof(struct cmsghdr)) + CMSG_ALIGN(len))
#define CMSG_LEN(len) \
(CMSG_ALIGN(sizeof(struct cmsghdr)) + (len))
#define __CMSG_FIRSTHDR(ctl, len) \
((len) >= sizeof(struct cmsghdr) ? (FAR struct cmsghdr *)(ctl) : \
(FAR struct cmsghdr *)NULL)
#define CMSG_FIRSTHDR(msg) \
__CMSG_FIRSTHDR((msg)->msg_control, (msg)->msg_controllen)
/****************************************************************************
* Type Definitions
****************************************************************************/
@@ -272,6 +292,49 @@ struct linger
int l_linger; /* Linger time, in seconds. */
};
struct msghdr
{
void *msg_name; /* Socket name */
int msg_namelen; /* Length of name */
struct iovec *msg_iov; /* Data blocks */
unsigned long msg_iovlen; /* Number of blocks */
void *msg_control; /* Per protocol magic (eg BSD file descriptor passing) */
unsigned long msg_controllen; /* Length of cmsg list */
unsigned int msg_flags;
};
struct cmsghdr
{
unsigned long cmsg_len; /* Data byte count, including hdr */
int cmsg_level; /* Originating protocol */
int cmsg_type; /* Protocol-specific type */
};
/****************************************************************************
* Inline Functions
****************************************************************************/
static inline struct cmsghdr *__cmsg_nxthdr(FAR void *__ctl,
unsigned int __size,
FAR struct cmsghdr *__cmsg)
{
FAR struct cmsghdr *__ptr;
__ptr = (struct cmsghdr *)(((unsigned char *)__cmsg) + CMSG_ALIGN(__cmsg->cmsg_len));
if ((unsigned long)((char *)(__ptr + 1) - (char *)__ctl) > __size)
{
return (struct cmsghdr *)0;
}
return __ptr;
}
static inline struct cmsghdr *cmsg_nxthdr(FAR struct msghdr *__msg,
FAR struct cmsghdr *__cmsg)
{
return __cmsg_nxthdr(__msg->msg_control, __msg->msg_controllen, __cmsg);
}
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
@@ -312,6 +375,9 @@ int getsockname(int sockfd, FAR struct sockaddr *addr,
int getpeername(int sockfd, FAR struct sockaddr *addr,
FAR socklen_t *addrlen);
ssize_t recvmsg(int sockfd, FAR struct msghdr *msg, int flags);
ssize_t sendmsg(int sockfd, FAR struct msghdr *msg, int flags);
#undef EXTERN
#if defined(__cplusplus)
}