sockets: initial impl

src/sys/syscalls/accept.c

@@ -0,0 +1,105 @@
+#include <kernel/syscalls.h>
+#include <kernel/socket.h>
+#include <kernel/fd.h>
+#include <arch/cls.h>
+#include <arch/spinlock.h>
+
+extern fs_t kerneltmpfs;
+
+syscallret syscall_accept(int sockfd, void* addr, size_t* addrlen){
+
+	syscallret retv;
+        retv.ret = -1;
+
+        if(addr > USER_SPACE_END){
+                retv.errno = EFAULT;
+                return retv;
+        }
+
+        proc_t* proc = arch_getcls()->thread->proc;
+
+	// access sockfd
+
+        fd_t* fd;
+
+        int err = fd_access(&proc->fdtable, &fd, sockfd);
+
+        if(err){
+                retv.errno = err;
+                return retv;
+        }
+
+        if(GETTYPE(fd->mode) != TYPE_SOCKET){
+                retv.errno = ENOTSOCK;
+                goto _fail;
+        }
+
+	socket_t* listenersock = fd->node->objdata;
+
+	// create new fd
+
+	fd_t* connfd = NULL;
+	int   connifd;
+
+	retv.errno = fd_alloc(&proc->fdtable, &connfd, &connifd, 0);
+
+	if(retv.errno)
+		goto _fail;
+	
+	connfd->node = vfs_newnode("SOCKET", &kerneltmpfs, NULL);
+        if(!connfd->node){
+                retv.errno = ENOMEM;
+                goto _fail;
+        }
+        connfd->mode = 0777 | MAKETYPE(TYPE_SOCKET);
+        connfd->node->refcount = 1;
+        connfd->node->st.st_mode = connfd->mode;
+
+	// create socket for new fd
+
+	socket_t* connsock;
+
+	retv.errno = socket_new(&connsock, listenersock->family, listenersock->type, listenersock->protocol);
+
+	// get peer
+
+	socket_t* peer;
+
+        retv.errno = socket_accept(&peer, listenersock, addr, addrlen);
+
+	if(retv.errno)
+		goto _fail;
+	
+	connsock->peer = peer;
+	connsock->state = SOCKET_STATE_CONNECTED;
+
+	spinlock_acquire(&peer->lock);
+	
+	peer->peer = connsock;
+
+	event_signal(&peer->acceptevent, true);
+	
+	spinlock_release(&peer->lock);
+
+        fd_release(fd);
+	
+	retv.ret = connifd;
+
+	memcpy(addr, &peer->addr_un, peer->addrlen);
+	*addrlen = peer->addrlen;
+
+        return retv;
+	
+	_fail:
+	
+        fd_release(fd);
+
+	if(connfd){
+		fd_release(connfd);
+		fd_free(&proc->fdtable, connifd);
+	}
+
+	return retv;
+	
+	
+}