libc: Add 'rmdir' to plugin interface

libports/include/libc-plugin/plugin.h

@@ -55,6 +55,7 @@ namespace Libc {
 			virtual bool supports_pipe();
 			virtual bool supports_readlink(const char *path, char *buf, size_t bufsiz);
 			virtual bool supports_rename(const char *oldpath, const char *newpath);
+			virtual bool supports_rmdir(const char *path);
 			virtual bool supports_select(int nfds,
 			                             fd_set *readfds,
 			                             fd_set *writefds,
@@ -116,6 +117,7 @@ namespace Libc {
 			                         struct sockaddr *src_addr, socklen_t *addrlen);
 			virtual ssize_t recvmsg(File_descriptor *, struct msghdr *msg, int flags);
 			virtual int rename(const char *oldpath, const char *newpath);
+			virtual int rmdir(const char *pathname);
 			virtual int select(int nfds, fd_set *readfds, fd_set *writefds,
 			                   fd_set *exceptfds, struct timeval *timeout);
 			virtual ssize_t send(File_descriptor *, const void *buf, ::size_t len, int flags);

libports/include/libc-plugin/plugin_registry.h

@@ -36,6 +36,7 @@ namespace Libc {
 			Plugin *get_plugin_for_pipe();
 			Plugin *get_plugin_for_readlink(const char *path, char *buf, size_t bufsiz);
 			Plugin *get_plugin_for_rename(const char *oldpath, const char *newpath);
+			Plugin *get_plugin_for_rmdir(const char *path);
 			Plugin *get_plugin_for_socket(int domain, int type, int protocol);
 			Plugin *get_plugin_for_stat(const char *path, struct stat *);
 			Plugin *get_plugin_for_symlink(const char *oldpath, const char *newpath);

libports/src/lib/libc/file_operations.cc

@@ -731,6 +731,18 @@ extern "C" int rename(const char *oldpath, const char *newpath)
 }
 
 
+extern "C" int rmdir(const char *path)
+{
+	try {
+		Absolute_path resolved_path;
+		resolve_symlinks_except_last_element(path, resolved_path);
+		FNAME_FUNC_WRAPPER(rmdir, resolved_path.base());
+	} catch(Symlink_resolve_error) {
+		return -1;
+	}
+}
+
+
 extern "C" ssize_t send(int libc_fd, const void *buf, ::size_t len, int flags) {
 	FD_FUNC_WRAPPER(send, libc_fd, buf, len, flags); }
 

libports/src/lib/libc/plugin.cc

@@ -93,6 +93,12 @@ bool Plugin::supports_rename(const char *, const char *)
 }
 
 
+bool Plugin::supports_rmdir(const char*)
+{
+	return false;
+}
+
+
 bool Plugin::supports_select(int, fd_set *, fd_set *,
                              fd_set *, struct timeval *)
 {
@@ -193,6 +199,7 @@ DUMMY(int, -1, munmap,       (void *, ::size_t));
 DUMMY(int, -1, pipe,         (File_descriptor*[2]));
 DUMMY(ssize_t, -1, readlink, (const char *, char *, size_t));
 DUMMY(int, -1, rename,       (const char *, const char *));
+DUMMY(int, -1, rmdir,        (const char*));
 DUMMY(int, -1, select,       (int, fd_set *, fd_set *, fd_set *, struct timeval *));
 DUMMY(int, -1, stat,         (const char*, struct stat*));
 DUMMY(int, -1, symlink,      (const char*, const char*));

libports/src/lib/libc/plugin_registry.cc

@@ -71,6 +71,8 @@ Plugin *Plugin_registry::get_plugin_for_readlink(const char *path, char *buf, si
 Plugin *Plugin_registry::get_plugin_for_rename(const char *oldpath, const char *newpath) {
 	GET_PLUGIN_FOR(rename, oldpath, newpath) }
 
+Plugin *Plugin_registry::get_plugin_for_rmdir(const char *path) {
+	GET_PLUGIN_FOR(rmdir, path) }
 
 Plugin *Plugin_registry::get_plugin_for_socket(int domain, int type, int protocol) {
 	GET_PLUGIN_FOR(socket, domain, type, protocol) }