syscall: multiple syscalls related to sockets

kernel-src/sys/syscalls/setsockopt.c

@@ -0,0 +1,69 @@
+#include <kernel/syscalls.h>
+#include <kernel/sock.h>
+#include <kernel/abi.h>
+#include <kernel/file.h>
+#include <errno.h>
+
+syscallret_t syscall_setsockopt(context_t *, int fd, int level, int optname, void *val, size_t len) {
+	syscallret_t ret = {
+		.ret = -1
+	};
+
+	if (level != SOL_SOCKET) {
+		ret.errno = ENOPROTOOPT;
+		return ret;
+	}
+
+	void *buffer = NULL;
+	if (val) {
+		buffer = alloc(len);
+		if (buffer == NULL) {
+			ret.errno = ENOMEM;
+			return ret;
+		}
+		memcpy(buffer, val, len);
+	}
+
+	file_t *file = fd_get(fd);
+	if (file == NULL) {
+		free(buffer);
+		ret.errno = EBADF;
+		return ret;
+	}
+
+	socket_t *socket = SOCKFS_SOCKET_FROM_NODE(file->vnode); 
+
+
+	MUTEX_ACQUIRE(&socket->mutex, false);
+	switch (optname) {
+		case SO_BINDTODEVICE:
+			if (val) {
+				socket->netdev = netdev_getdev(val);
+				ret.errno = socket->netdev ? 0 : ENODEV;
+			} else {
+				socket->netdev = NULL;
+			}
+			break;
+		case SO_BROADCAST:
+			if (val == NULL) {
+				ret.errno = EFAULT;
+			} else {
+				socket->broadcast = *((int *)buffer);
+				ret.errno = 0;
+			}
+			break;
+		default:
+		ret.errno = ENOPROTOOPT;
+	}
+
+	MUTEX_RELEASE(&socket->mutex);
+
+	ret.ret = ret.errno ? -1 : 0;
+
+	fd_release(file);
+
+	if (val)
+		free(buffer);
+
+	return ret;
+}