apps/rm.cpp

@@ -1,35 +1,10 @@
 #include <os/ArgumentParser.h>
-#include <os/Directory.h>
-#include <os/File.h>
 #include <os/FileSystem.h>
 
-Result<void> remove_wrapper(const os::Path& path, bool verbose)
-{
-    TRY(os::FileSystem::remove(path));
-    if (verbose) os::println("removed '%s'", path.name().chars());
-    return {};
-}
-
-Result<void> remove_tree(const os::Path& path, bool verbose)
-{
-    auto rc = remove_wrapper(path, verbose);
-    if (!rc.has_error()) return {};
-    if (rc.error() != ENOTEMPTY) return rc.release_error();
-
-    auto dir = TRY(os::Directory::open(path));
-
-    Vector<String> entries = TRY(dir->list_names(os::Directory::Filter::ParentAndBase));
-
-    for (const auto& entry : entries) { TRY(remove_tree({ dir->fd(), entry.view() }, verbose)); }
-
-    return remove_wrapper(path, verbose);
-}
-
 Result<int> luna_main(int argc, char** argv)
 {
     StringView path;
     bool recursive;
-    bool verbose;
 
     os::ArgumentParser parser;
     parser.add_description("Remove a path from the file system."_sv);
@@ -37,12 +12,11 @@ Result<int> luna_main(int argc, char** argv)
     parser.add_positional_argument(path, "path"_sv, true);
     parser.add_switch_argument(recursive, 'r', "recursive"_sv,
                                "remove a directory recursively (by default, rm removes only empty directories)"_sv);
-    parser.add_switch_argument(verbose, 'v', "verbose"_sv, "log every removed file and directory"_sv);
     parser.parse(argc, argv);
 
-    if (!recursive) TRY(remove_wrapper(path, verbose));
+    if (!recursive) TRY(os::FileSystem::remove(path));
     else
-        TRY(remove_tree(path, verbose));
+        TRY(os::FileSystem::remove_tree(path));
 
     return 0;
 }

libos/include/os/FileSystem.h

@@ -68,6 +68,15 @@ namespace os
          */
         Result<void> remove(const Path& path);
 
+        /**
+         * @brief Remove a directory tree from the file system recursively, deleting subfiles and subdirectories as
+         * well.
+         *
+         * @param path The path to remove.
+         * @return Result<void> Whether the operation succeeded.
+         */
+        Result<void> remove_tree(const Path& path);
+
         /**
          * @brief Read the target of a symbolic link.
          *

libos/src/Directory.cpp

@@ -12,6 +12,7 @@
 #include <luna/CString.h>
 #include <os/Directory.h>
 #include <os/FileSystem.h>
+#include <sys/syscall.h>
 #include <unistd.h>
 
 static bool should_skip_entry(const char* name, os::Directory::Filter filter)
@@ -32,8 +33,8 @@ namespace os
     {
         auto dir = TRY(adopt_shared_if_nonnull(new (std::nothrow) Directory({})));
 
-        int fd = openat(path.dirfd(), path.name().chars(), O_RDONLY | O_DIRECTORY, 0);
-        if (fd < 0) return err(errno);
+        long rc = syscall(SYS_openat, path.dirfd(), path.name().chars(), O_RDONLY | O_DIRECTORY, 0);
+        int fd = TRY(Result<int>::from_syscall(rc));
 
         DIR* dp = fdopendir(fd);
         if (!dp)

libos/src/File.cpp

@@ -10,6 +10,7 @@
 #include <errno.h>
 #include <luna/StringBuilder.h>
 #include <os/File.h>
+#include <sys/syscall.h>
 #include <unistd.h>
 
 static SharedPtr<os::File> g_stdin = {};
@@ -82,8 +83,8 @@ namespace os
     {
         auto file = TRY(adopt_shared_if_nonnull(new (std::nothrow) File({})));
 
-        int fd = openat(path.dirfd(), path.name().chars(), flags, mode);
-        if (fd < 0) return err(errno);
+        long rc = syscall(SYS_openat, path.dirfd(), path.name().chars(), flags, mode);
+        int fd = TRY(Result<int>::from_syscall(rc));
 
         file->m_file = fdopen(fd, stdio_mode_from_openmode(flags));
         if (!file->m_file) return err(errno);

libos/src/FileSystem.cpp

@@ -10,13 +10,13 @@
 #include <dirent.h>
 #include <errno.h>
 #include <fcntl.h>
-#include <luna/Buffer.h>
 #include <luna/PathParser.h>
 #include <luna/String.h>
 #include <os/Directory.h>
 #include <os/FileSystem.h>
 #include <pwd.h>
 #include <stdlib.h>
+#include <sys/syscall.h>
 #include <unistd.h>
 
 namespace os::FileSystem
@@ -41,26 +41,39 @@ namespace os::FileSystem
 
     Result<void> stat(const Path& path, struct stat& st, bool follow_symlinks)
     {
-        int rc = fstatat(path.dirfd(), path.name().chars(), &st,
+        long rc = syscall(SYS_fstatat, path.dirfd(), path.name().chars(), &st,
                           (int)(path.is_empty_path() | (follow_symlinks ? 0 : AT_SYMLINK_NOFOLLOW)));
 
-        if (rc < 0) return err(errno);
-        return {};
+        return Result<void>::from_syscall(rc);
     }
 
     Result<void> create_directory(StringView path, mode_t mode)
     {
-        int rc = mkdir(path.chars(), mode);
-        if (rc < 0) return err(errno);
-        return {};
+        long rc = syscall(SYS_mkdir, path.chars(), mode);
+
+        return Result<void>::from_syscall(rc);
     }
 
     Result<void> remove(const Path& path)
     {
-        // FIXME: This will not work on many operating systems that require rmdir() for directories.
-        int rc = unlinkat(path.dirfd(), path.name().chars(), 0);
-        if (rc < 0) return err(errno);
-        return {};
+        long rc = syscall(SYS_unlinkat, path.dirfd(), path.name().chars(), 0);
+
+        return Result<void>::from_syscall(rc);
+    }
+
+    Result<void> remove_tree(const Path& path)
+    {
+        auto rc = remove(path);
+        if (!rc.has_error()) return {};
+        if (rc.error() != ENOTEMPTY) return rc.release_error();
+
+        auto dir = TRY(os::Directory::open(path));
+
+        Vector<String> entries = TRY(dir->list_names(os::Directory::Filter::ParentAndBase));
+
+        for (const auto& entry : entries) { TRY(remove_tree({ dir->fd(), entry.view() })); }
+
+        return remove(path);
     }
 
     Result<String> readlink(const Path& path)
@@ -69,13 +82,14 @@ namespace os::FileSystem
         TRY(stat(path, st, false));
         if (!S_ISLNK(st.st_mode)) return String {};
 
-        Buffer buf = TRY(Buffer::create_sized(st.st_size + 1));
-        memset(buf.data(), 0, buf.size());
+        char* buf = (char*)TRY(calloc_impl(st.st_size + 1, 1));
+        auto guard = make_scope_guard([buf] { free_impl(buf); });
+        usize nread = TRY(
+            Result<usize>::from_syscall(syscall(SYS_readlinkat, path.dirfd(), path.name().chars(), buf, st.st_size)));
 
-        ssize_t nread = readlinkat(path.dirfd(), path.name().chars(), (char*)buf.data(), st.st_size);
-        if (nread < 0) return err(errno);
+        guard.deactivate();
 
-        return String { (char*)buf.release_data(), (usize)nread };
+        return String { buf, nread };
     }
 
     Result<String> working_directory()
@@ -98,8 +112,8 @@ namespace os::FileSystem
 
     Result<void> change_directory(StringView path)
     {
-        int rc = chdir(path.chars());
-        if (rc < 0) return err(errno);
-        return {};
+        long rc = syscall(SYS_chdir, path.chars());
+
+        return Result<void>::from_syscall(rc);
     }
 }

libos/src/Process.cpp

@@ -9,8 +9,8 @@
 
 #include <errno.h>
 #include <os/Process.h>
-#include <signal.h>
 #include <stdlib.h>
+#include <sys/syscall.h>
 #include <unistd.h>
 
 extern char** environ;
@@ -19,9 +19,8 @@ namespace os
 {
     Result<pid_t> Process::fork()
     {
-        pid_t pid = ::fork();
-        if (pid < 0) return err(errno);
-        return pid;
+        long rc = syscall(SYS_fork);
+        return Result<pid_t>::from_syscall(rc);
     }
 
     Result<void> Process::exec(StringView path, Slice<String> args, bool search_in_path)
@@ -122,16 +121,14 @@ namespace os
 
     Result<pid_t> Process::wait(pid_t child, int* status, int options)
     {
-        pid_t pid = waitpid(child, status, options);
-        if (pid < 0) return err(errno);
-        return pid;
+        long rc = syscall(SYS_waitpid, child, status, options);
+        return Result<pid_t>::from_syscall(rc);
     }
 
     Result<void> Process::kill(pid_t pid, int signo)
     {
-        int rc = ::kill(pid, signo);
-        if (rc < 0) return err(errno);
-        return {};
+        long rc = syscall(SYS_kill, pid, signo);
+        return Result<void>::from_syscall(rc);
     }
 
     [[noreturn]] void Process::exit(int status)