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Kernel+LibC+UserspaceEmulator: Mostly add recvmsg(), sendmsg()

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The implementation only supports a single iovec for now.
Some might say having more than one iovec is the main point of
recvmsg() and sendmsg(), but I'm interested in the control message
bits.
This commit is contained in:
Nico Weber 2020-09-16 11:45:00 -04:00 • committed by Andreas Kling
parent 19f2203b53
commit b36a2d6686
9 changed files with 158 additions and 79 deletions
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37
Libraries/LibC/sys/socket.cpp
View file

@ -28,7 +28,9 @@
#include <Kernel/API/Syscall.h>
#include <errno.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/uio.h>
extern "C" {
@ -68,11 +70,17 @@ int shutdown(int sockfd, int how)
__RETURN_WITH_ERRNO(rc, rc, -1);
}
ssize_t sendmsg(int sockfd, const struct msghdr* msg, int flags)
{
int rc = syscall(SC_sendmsg, sockfd, msg, flags);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
ssize_t sendto(int sockfd, const void* data, size_t data_length, int flags, const struct sockaddr* addr, socklen_t addr_length)
{
Syscall::SC_sendto_params params { sockfd, { data, data_length }, flags, addr, addr_length };
int rc = syscall(SC_sendto, &params);
__RETURN_WITH_ERRNO(rc, rc, -1);
iovec iov = { const_cast<void*>(data), data_length };
msghdr msg = { const_cast<struct sockaddr*>(addr), addr_length, &iov, 1, nullptr, 0, 0 };
return sendmsg(sockfd, &msg, flags);
}
ssize_t send(int sockfd, const void* data, size_t data_length, int flags)
@ -80,11 +88,28 @@ ssize_t send(int sockfd, const void* data, size_t data_length, int flags)
return sendto(sockfd, data, data_length, flags, nullptr, 0);
}
ssize_t recvmsg(int sockfd, struct msghdr* msg, int flags)
{
int rc = syscall(SC_recvmsg, sockfd, msg, flags);
__RETURN_WITH_ERRNO(rc, rc, -1);
}
ssize_t recvfrom(int sockfd, void* buffer, size_t buffer_length, int flags, struct sockaddr* addr, socklen_t* addr_length)
{
Syscall::SC_recvfrom_params params { sockfd, { buffer, buffer_length }, flags, addr, addr_length };
int rc = syscall(SC_recvfrom, &params);
__RETURN_WITH_ERRNO(rc, rc, -1);
if (!addr_length && addr) {
errno = EINVAL;
return -1;
}
sockaddr_storage internal_addr;
iovec iov = { buffer, buffer_length };
msghdr msg = { addr ? &internal_addr : nullptr, addr ? sizeof(internal_addr) : 0, &iov, 1, nullptr, 0, 0 };
ssize_t rc = recvmsg(sockfd, &msg, flags);
if (rc >= 0 && addr) {
memcpy(addr, &internal_addr, min(*addr_length, msg.msg_namelen));
*addr_length = msg.msg_namelen;
}
return rc;
}
ssize_t recv(int sockfd, void* buffer, size_t buffer_length, int flags)

13
Libraries/LibC/sys/socket.h
View file

@ -61,10 +61,21 @@ __BEGIN_DECLS
#define IPPROTO_TCP 6
#define IPPROTO_UDP 17
#define MSG_TRUNC 0x1
#define MSG_DONTWAIT 0x40
typedef uint16_t sa_family_t;
struct msghdr {
void* msg_name;
socklen_t msg_namelen;
struct iovec* msg_iov;
int msg_iovlen;
void* msg_control;
socklen_t msg_controllen;
int msg_flags;
};
struct sockaddr {
sa_family_t sa_family;
char sa_data[14];
@ -102,8 +113,10 @@ int accept(int sockfd, struct sockaddr*, socklen_t*);
int connect(int sockfd, const struct sockaddr*, socklen_t);
int shutdown(int sockfd, int how);
ssize_t send(int sockfd, const void*, size_t, int flags);
ssize_t sendmsg(int sockfd, const struct msghdr*, int flags);
ssize_t sendto(int sockfd, const void*, size_t, int flags, const struct sockaddr*, socklen_t);
ssize_t recv(int sockfd, void*, size_t, int flags);
ssize_t recvmsg(int sockfd, struct msghdr*, int flags);
ssize_t recvfrom(int sockfd, void*, size_t, int flags, struct sockaddr*, socklen_t*);
int getsockopt(int sockfd, int level, int option, void*, socklen_t*);
int setsockopt(int sockfd, int level, int option, const void*, socklen_t);