Kernel/LibC: Implement symlink{,at}

userspace/libraries/LibC/include/sys/syscall.h

@@ -89,6 +89,7 @@ __BEGIN_DECLS
 	O(SYS_POSIX_OPENPT,		posix_openpt)	\
 	O(SYS_PTSNAME,			ptsname)		\
 	O(SYS_FSYNC,			fsync)			\
+	O(SYS_SYMLINKAT,		symlinkat)		\
 
 enum Syscall
 {

userspace/libraries/LibC/unistd.cpp

@@ -623,6 +623,10 @@ unsigned alarm(unsigned seconds)
 
 int symlink(const char* path1, const char* path2)
 {
-	dwarnln("FIXME: symlink({}, {})", path1, path2);
-	ASSERT_NOT_REACHED();
+	return symlinkat(path1, AT_FDCWD, path2);
+}
+
+int symlinkat(const char* path1, int fd, const char* path2)
+{
+	return syscall(SYS_SYMLINKAT, path1, fd, path2);
 }