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socket-util: Add functions for sending fds over Unix domain sockets.

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These will be used in upcoming commits.

This commit also adds corresponding definitions to the "sparse" header,
so that sparse still works.

Signed-off-by: Ben Pfaff <blp@nicira.com>
This commit is contained in:
Ben Pfaff
2012-06-14 09:46:18 -07:00
parent a0505c49dd
commit fd94a42c43
3 changed files with 310 additions and 0 deletions
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31
include/sparse/sys/socket.h
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@@ -47,6 +47,37 @@ struct msghdr {
int msg_flags;
};
struct cmsghdr {
size_t cmsg_len;
int cmsg_level;
int cmsg_type;
unsigned char cmsg_data[];
};
#define __CMSG_ALIGNTO sizeof(size_t)
#define CMSG_ALIGN(LEN) \
(((LEN) + __CMSG_ALIGNTO - 1) / __CMSG_ALIGNTO * __CMSG_ALIGNTO)
#define CMSG_DATA(CMSG) ((CMSG)->cmsg_data)
#define CMSG_LEN(LEN) (sizeof(struct cmsghdr) + (LEN))
#define CMSG_SPACE(LEN) CMSG_ALIGN(CMSG_LEN(LEN))
#define CMSG_FIRSTHDR(MSG) \
((MSG)->msg_controllen ? (struct cmsghdr *) (MSG)->msg_control : NULL)
#define CMSG_NXTHDR(MSG, CMSG) __cmsg_nxthdr(MSG, CMSG)
static inline struct cmsghdr *
__cmsg_nxthdr(struct msghdr *msg, struct cmsghdr *cmsg)
{
size_t ofs = (char *) cmsg - (char *) msg->msg_control;
size_t next_ofs = ofs + CMSG_ALIGN(cmsg->cmsg_len);
return (next_ofs < msg->msg_controllen
? (void *) ((char *) msg->msg_control + next_ofs)
: NULL);
}
enum {
SCM_RIGHTS = 1
};
enum {
SOCK_DGRAM,
SOCK_RAW,