diff --git a/lib/std/os/linux/io_uring.zig b/lib/std/os/linux/io_uring.zig index 19d1bea5ab..b254d91e08 100644 --- a/lib/std/os/linux/io_uring.zig +++ b/lib/std/os/linux/io_uring.zig @@ -764,6 +764,21 @@ pub const IO_Uring = struct { return sqe; } + /// Queues (but does not submit) an SQE to perform a `unlinkat(2)`. + /// Returns a pointer to the SQE. + pub fn unlinkat( + self: *IO_Uring, + user_data: u64, + dir_fd: os.fd_t, + path: [*:0]const u8, + flags: u32, + ) !*io_uring_sqe { + const sqe = try self.get_sqe(); + io_uring_prep_unlinkat(sqe, dir_fd, path, flags); + sqe.user_data = user_data; + return sqe; + } + /// Registers an array of file descriptors. /// Every time a file descriptor is put in an SQE and submitted to the kernel, the kernel must /// retrieve a reference to the file, and once I/O has completed the file reference must be @@ -1340,6 +1355,16 @@ pub fn io_uring_prep_renameat( sqe.rw_flags = flags; } +pub fn io_uring_prep_unlinkat( + sqe: *io_uring_sqe, + dir_fd: os.fd_t, + path: [*:0]const u8, + flags: u32, +) void { + io_uring_prep_rw(.UNLINKAT, sqe, dir_fd, @ptrToInt(path), 0, 0); + sqe.rw_flags = flags; +} + test "structs/offsets/entries" { if (builtin.os.tag != .linux) return error.SkipZigTest; @@ -2381,3 +2406,53 @@ test "renameat" { try testing.expectEqualStrings("hello", new_file_data[0..read]); } } + +test "unlinkat" { + if (builtin.os.tag != .linux) return error.SkipZigTest; + + var ring = IO_Uring.init(1, 0) catch |err| switch (err) { + error.SystemOutdated => return error.SkipZigTest, + error.PermissionDenied => return error.SkipZigTest, + else => return err, + }; + defer ring.deinit(); + + const path = "test_io_uring_unlinkat"; + + // Write old file with data + + const file = try std.fs.cwd().createFile(path, .{ .truncate = true, .mode = 0o666 }); + defer file.close(); + defer std.fs.cwd().deleteFile(path) catch {}; + + // Submit unlinkat + + var sqe = try ring.unlinkat( + 0x12121212, + linux.AT.FDCWD, + path, + 0, + ); + try testing.expectEqual(linux.IORING_OP.UNLINKAT, sqe.opcode); + try testing.expectEqual(@as(i32, linux.AT.FDCWD), sqe.fd); + try testing.expectEqual(@as(u32, 1), try ring.submit()); + + const cqe = try ring.copy_cqe(); + switch (cqe.err()) { + .SUCCESS => {}, + // This kernel's io_uring does not yet implement unlinkat (kernel version < 5.11) + .INVAL => return error.SkipZigTest, + else => |errno| std.debug.panic("unhandled errno: {}", .{errno}), + } + try testing.expectEqual(linux.io_uring_cqe{ + .user_data = 0x12121212, + .res = 0, + .flags = 0, + }, cqe); + + // Validate that the file doesn't exist anymore + _ = std.fs.cwd().openFile(path, .{}) catch |err| switch (err) { + error.FileNotFound => {}, + else => std.debug.panic("unexpected error: {}", .{err}), + }; +}