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Kernel: Support sending filedescriptors with sendmsg(2) and SCM_RIGHTS

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This is necessary to support the wayland protocol.
I also moved the CMSG_* macros to the kernel API since they are used in
both kernel and userspace.
this does not break ntpquery/SCM_TIMESTAMP.
This commit is contained in:
Peter Elliott 2023-02-13 16:01:13 -07:00 • committed by Linus Groh
parent ae5d7f542c
commit f20902deb3
5 changed files with 97 additions and 37 deletions
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26
Kernel/API/POSIX/sys/socket.h
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@ -81,6 +81,32 @@ struct msghdr {
int msg_flags;
};
// 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 (struct cmsghdr*)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 (struct cmsghdr*)0;
return next;
}
static inline void* CMSG_DATA(struct cmsghdr* cmsg)
{
return (void*)(cmsg + 1);
}
struct sockaddr {
sa_family_t sa_family;
char sa_data[14];