sock: MSG_PEEK and other fixes

kernel-src/sys/syscalls/accept.c

@@ -3,7 +3,7 @@
 #include <kernel/sock.h>
 #include <errno.h>
 
-syscallret_t syscall_accept(context_t *, int oldfd, abisockaddr_t *abisockaddr, size_t *addrlen, int acceptflags) {
+syscallret_t syscall_accept(context_t *, int oldfd, abisockaddr_t *abisockaddr, int *addrlen, int acceptflags) {
 	syscallret_t ret = {
 		.ret = -1
 	};

kernel-src/sys/syscalls/read.c

@@ -23,6 +23,11 @@ syscallret_t syscall_read(context_t *context, int fd, void *buffer, size_t size)
 		goto cleanup;
 	}
 
+	if (size == 0) {
+		ret.ret = 0;
+		ret.errno = 0;
+		goto cleanup;
+	}
 	size_t bytesread;
 	uintmax_t offset = file->offset;
 	ret.errno = vfs_read(file->vnode, kernelbuff, size, file->offset, &bytesread, fileflagstovnodeflags(file->flags));

kernel-src/sys/syscalls/recvmsg.c

@@ -6,9 +6,13 @@
 #include <kernel/file.h>
 #include <kernel/alloc.h>
 
+#define KNOWN_FLAGS (MSG_PEEK)
+
 syscallret_t syscall_recvmsg(context_t *, int fd, msghdr_t *umsghdr, int flags) {
-	__assert(flags == 0);
-	syscallret_t ret;
+	__assert((flags & ~KNOWN_FLAGS) == 0);
+	syscallret_t ret = {
+		.ret = -1
+	};
 
 	msghdr_t msghdr;
 	ret.errno = sock_copymsghdr(&msghdr, umsghdr);
@@ -37,8 +41,10 @@ syscallret_t syscall_recvmsg(context_t *, int fd, msghdr_t *umsghdr, int flags)
 	sockaddr_t sockaddr;
 	socket_t *socket = SOCKFS_SOCKET_FROM_NODE(file->vnode);
 	size_t recvcount;
-	ret.errno = socket->ops->recv(socket, &sockaddr, buffer, buffersize, fileflagstovnodeflags(file->flags), &recvcount);
+	ret.errno = socket->ops->recv(socket, &sockaddr, buffer, buffersize, fileflagstovnodeflags(file->flags) | ((flags & MSG_PEEK) ? SOCKET_RECV_FLAGS_PEEK : 0), &recvcount);
 	ret.ret = ret.errno ? -1 : recvcount;
+	if (ret.errno)
+		goto cleanup;
 
 	uintmax_t iovoffset = 0;
 	for (int i = 0; i < msghdr.iovcount; ++i) {

kernel-src/sys/syscalls/socket.c

@@ -12,10 +12,10 @@ syscallret_t syscall_socket(context_t *, int domain, int type, int protocol) {
 
 	switch (domain) {
 		case AF_INET:
-			if (type != SOCK_DGRAM)
-				break;
-
-			socktype = SOCKET_TYPE_UDP;
+			if (type == SOCK_STREAM)
+				socktype = SOCKET_TYPE_TCP;
+			if (type == SOCK_DGRAM)
+				socktype = SOCKET_TYPE_UDP;
 			break;
 		case AF_LOCAL:
 			socktype = SOCKET_TYPE_LOCAL;

kernel-src/sys/syscalls/write.c

@@ -21,6 +21,12 @@ syscallret_t syscall_write(context_t *context, int fd, void *buffer, size_t size
 		goto cleanup;
 	}
 
+	if (size == 0) {
+		ret.ret = 0;
+		ret.errno = 0;
+		goto cleanup;
+	}
+
 	// TODO safe memcpy
 	memcpy(kernelbuff, buffer, size);