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Kernel+LibC+UserspaceEmulator: Add SO_TIMESTAMP, and cmsg definitions

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When SO_TIMESTAMP is set as an option on a SOCK_DGRAM socket, then
recvmsg() will return a SCM_TIMESTAMP control message that
contains a struct timeval with the system time that was current
when the socket was received.
This commit is contained in:
Nico Weber 2020-09-16 12:32:45 -04:00 • committed by Andreas Kling
parent ae5ba4074d
commit 47b3e98af8
6 changed files with 94 additions and 2 deletions
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40
Libraries/LibC/sys/socket.h
View file

@ -62,10 +62,17 @@ __BEGIN_DECLS
#define IPPROTO_UDP 17
#define MSG_TRUNC 0x1
#define MSG_CTRUNC 0x2
#define MSG_DONTWAIT 0x40
typedef uint16_t sa_family_t;
struct cmsghdr {
socklen_t cmsg_len;
int cmsg_level;
int cmsg_type;
};
struct msghdr {
void* msg_name;
socklen_t msg_namelen;
@ -99,6 +106,7 @@ enum {
SO_REUSEADDR,
SO_BINDTODEVICE,
SO_KEEPALIVE,
SO_TIMESTAMP,
};
#define SO_RCVTIMEO SO_RCVTIMEO
#define SO_SNDTIMEO SO_SNDTIMEO
@ -108,6 +116,12 @@ enum {
#define SO_REUSEADDR SO_REUSEADDR
#define SO_BINDTODEVICE SO_BINDTODEVICE
#define SO_KEEPALIVE SO_KEEPALIVE
#define SO_TIMESTAMP SO_TIMESTAMP
enum {
SCM_TIMESTAMP,
};
#define SCM_TIMESTAMP SCM_TIMESTAMP
struct sockaddr_storage {
union {
@ -135,4 +149,30 @@ int getpeername(int sockfd, struct sockaddr*, socklen_t*);
int sendfd(int sockfd, int fd);
int recvfd(int sockfd);
// These three are non-POSIX, but common:
#define CMSG_ALIGN(x) (((x) + sizeof(void*) - 1) & ~(sizeof(void*) - 1))
#define CMSG_SPACE(x) (CMSG_ALIGN(sizeof(struct cmsghdr)) + CMSG_ALIGN(x))
#define CMSG_LEN(x) (CMSG_ALIGN(sizeof(struct cmsghdr)) + (x))
static inline struct cmsghdr* CMSG_FIRSTHDR(struct msghdr* msg)
{
if (msg->msg_controllen < sizeof(struct cmsghdr))
return 0;
return (struct cmsghdr*)msg->msg_control;
}
static inline struct cmsghdr* CMSG_NXTHDR(struct msghdr* msg, struct cmsghdr* cmsg)
{
struct cmsghdr* next = (struct cmsghdr*)((char*)cmsg + CMSG_ALIGN(cmsg->cmsg_len));
unsigned offset = (char*)next - (char*)msg->msg_control;
if (msg->msg_controllen < offset + sizeof(struct cmsghdr))
return NULL;
return next;
}
static inline void* CMSG_DATA(struct cmsghdr* cmsg)
{
return (void*)(cmsg + 1);
}
__END_DECLS