mirror of
https://github.com/ziglang/zig.git
synced 2024-11-16 09:03:12 +00:00
58f961f4cb
This adds a special CWD file descriptor, AT.FDCWD (-2), to refer to the current working directory. The `*at(...)` functions look for this and resolve relative paths against the stored CWD. Absolute paths are dynamically matched against the stored Preopens. "os.initPreopensWasi()" must be called before std.os functions will resolve relative or absolute paths correctly. This is asserted at runtime. Support has been added for: `open`, `rename`, `mkdir`, `rmdir`, `chdir`, `fchdir`, `link`, `symlink`, `unlink`, `readlink`, `fstatat`, `access`, and `faccessat`. This also includes limited support for `getcwd()` and `realpath()`. These return an error if the CWD does not correspond to a Preopen with an absolute path. They also do not currently expand symlinks.
565 lines
18 KiB
Zig
565 lines
18 KiB
Zig
// wasi_snapshot_preview1 spec available (in witx format) here:
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// * typenames -- https://github.com/WebAssembly/WASI/blob/master/phases/snapshot/witx/typenames.witx
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// * module -- https://github.com/WebAssembly/WASI/blob/master/phases/snapshot/witx/wasi_snapshot_preview1.witx
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const std = @import("std");
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const assert = std.debug.assert;
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comptime {
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assert(@alignOf(i8) == 1);
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assert(@alignOf(u8) == 1);
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assert(@alignOf(i16) == 2);
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assert(@alignOf(u16) == 2);
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assert(@alignOf(i32) == 4);
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assert(@alignOf(u32) == 4);
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// assert(@alignOf(i64) == 8);
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// assert(@alignOf(u64) == 8);
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}
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pub const F_OK = 0;
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pub const X_OK = 1;
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pub const W_OK = 2;
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pub const R_OK = 4;
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pub const iovec_t = std.os.iovec;
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pub const ciovec_t = std.os.iovec_const;
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pub extern "wasi_snapshot_preview1" fn args_get(argv: [*][*:0]u8, argv_buf: [*]u8) errno_t;
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pub extern "wasi_snapshot_preview1" fn args_sizes_get(argc: *usize, argv_buf_size: *usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn clock_res_get(clock_id: clockid_t, resolution: *timestamp_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn clock_time_get(clock_id: clockid_t, precision: timestamp_t, timestamp: *timestamp_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn environ_get(environ: [*][*:0]u8, environ_buf: [*]u8) errno_t;
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pub extern "wasi_snapshot_preview1" fn environ_sizes_get(environ_count: *usize, environ_buf_size: *usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_advise(fd: fd_t, offset: filesize_t, len: filesize_t, advice: advice_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_allocate(fd: fd_t, offset: filesize_t, len: filesize_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_close(fd: fd_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_datasync(fd: fd_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_pread(fd: fd_t, iovs: [*]const iovec_t, iovs_len: usize, offset: filesize_t, nread: *usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_pwrite(fd: fd_t, iovs: [*]const ciovec_t, iovs_len: usize, offset: filesize_t, nwritten: *usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_read(fd: fd_t, iovs: [*]const iovec_t, iovs_len: usize, nread: *usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_readdir(fd: fd_t, buf: [*]u8, buf_len: usize, cookie: dircookie_t, bufused: *usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_renumber(from: fd_t, to: fd_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_seek(fd: fd_t, offset: filedelta_t, whence: whence_t, newoffset: *filesize_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_sync(fd: fd_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_tell(fd: fd_t, newoffset: *filesize_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_write(fd: fd_t, iovs: [*]const ciovec_t, iovs_len: usize, nwritten: *usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_fdstat_get(fd: fd_t, buf: *fdstat_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_fdstat_set_flags(fd: fd_t, flags: fdflags_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_fdstat_set_rights(fd: fd_t, fs_rights_base: rights_t, fs_rights_inheriting: rights_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_filestat_get(fd: fd_t, buf: *filestat_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_filestat_set_size(fd: fd_t, st_size: filesize_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_filestat_set_times(fd: fd_t, st_atim: timestamp_t, st_mtim: timestamp_t, fstflags: fstflags_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_prestat_get(fd: fd_t, buf: *prestat_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn fd_prestat_dir_name(fd: fd_t, path: [*]u8, path_len: usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn path_create_directory(fd: fd_t, path: [*]const u8, path_len: usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn path_filestat_get(fd: fd_t, flags: lookupflags_t, path: [*]const u8, path_len: usize, buf: *filestat_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn path_filestat_set_times(fd: fd_t, flags: lookupflags_t, path: [*]const u8, path_len: usize, st_atim: timestamp_t, st_mtim: timestamp_t, fstflags: fstflags_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn path_link(old_fd: fd_t, old_flags: lookupflags_t, old_path: [*]const u8, old_path_len: usize, new_fd: fd_t, new_path: [*]const u8, new_path_len: usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn path_open(dirfd: fd_t, dirflags: lookupflags_t, path: [*]const u8, path_len: usize, oflags: oflags_t, fs_rights_base: rights_t, fs_rights_inheriting: rights_t, fs_flags: fdflags_t, fd: *fd_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn path_readlink(fd: fd_t, path: [*]const u8, path_len: usize, buf: [*]u8, buf_len: usize, bufused: *usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn path_remove_directory(fd: fd_t, path: [*]const u8, path_len: usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn path_rename(old_fd: fd_t, old_path: [*]const u8, old_path_len: usize, new_fd: fd_t, new_path: [*]const u8, new_path_len: usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn path_symlink(old_path: [*]const u8, old_path_len: usize, fd: fd_t, new_path: [*]const u8, new_path_len: usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn path_unlink_file(fd: fd_t, path: [*]const u8, path_len: usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn poll_oneoff(in: *const subscription_t, out: *event_t, nsubscriptions: usize, nevents: *usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn proc_exit(rval: exitcode_t) noreturn;
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pub extern "wasi_snapshot_preview1" fn random_get(buf: [*]u8, buf_len: usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn sched_yield() errno_t;
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pub extern "wasi_snapshot_preview1" fn sock_recv(sock: fd_t, ri_data: *const iovec_t, ri_data_len: usize, ri_flags: riflags_t, ro_datalen: *usize, ro_flags: *roflags_t) errno_t;
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pub extern "wasi_snapshot_preview1" fn sock_send(sock: fd_t, si_data: *const ciovec_t, si_data_len: usize, si_flags: siflags_t, so_datalen: *usize) errno_t;
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pub extern "wasi_snapshot_preview1" fn sock_shutdown(sock: fd_t, how: sdflags_t) errno_t;
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/// Get the errno from a syscall return value, or 0 for no error.
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pub fn getErrno(r: errno_t) errno_t {
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return r;
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}
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pub const STDIN_FILENO = 0;
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pub const STDOUT_FILENO = 1;
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pub const STDERR_FILENO = 2;
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pub const mode_t = u32;
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pub const time_t = i64; // match https://github.com/CraneStation/wasi-libc
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pub const timespec = extern struct {
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tv_sec: time_t,
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tv_nsec: isize,
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pub fn fromTimestamp(tm: timestamp_t) timespec {
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const tv_sec: timestamp_t = tm / 1_000_000_000;
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const tv_nsec = tm - tv_sec * 1_000_000_000;
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return timespec{
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.tv_sec = @intCast(time_t, tv_sec),
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.tv_nsec = @intCast(isize, tv_nsec),
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};
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}
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pub fn toTimestamp(ts: timespec) timestamp_t {
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const tm = @intCast(timestamp_t, ts.tv_sec * 1_000_000_000) + @intCast(timestamp_t, ts.tv_nsec);
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return tm;
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}
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};
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pub const Stat = struct {
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dev: device_t,
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ino: inode_t,
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mode: mode_t,
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filetype: filetype_t,
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nlink: linkcount_t,
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size: filesize_t,
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atim: timespec,
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mtim: timespec,
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ctim: timespec,
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const Self = @This();
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pub fn fromFilestat(stat: filestat_t) Self {
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return Self{
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.dev = stat.dev,
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.ino = stat.ino,
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.mode = 0,
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.filetype = stat.filetype,
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.nlink = stat.nlink,
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.size = stat.size,
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.atim = stat.atime(),
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.mtim = stat.mtime(),
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.ctim = stat.ctime(),
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};
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}
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pub fn atime(self: Self) timespec {
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return self.atim;
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}
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pub fn mtime(self: Self) timespec {
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return self.mtim;
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}
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pub fn ctime(self: Self) timespec {
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return self.ctim;
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}
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};
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pub const IOV_MAX = 1024;
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pub const AT = struct {
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pub const REMOVEDIR: u32 = 0x4;
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pub const FDCWD: fd_t = -2;
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};
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// As defined in the wasi_snapshot_preview1 spec file:
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// https://github.com/WebAssembly/WASI/blob/master/phases/snapshot/witx/typenames.witx
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pub const advice_t = u8;
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pub const ADVICE_NORMAL: advice_t = 0;
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pub const ADVICE_SEQUENTIAL: advice_t = 1;
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pub const ADVICE_RANDOM: advice_t = 2;
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pub const ADVICE_WILLNEED: advice_t = 3;
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pub const ADVICE_DONTNEED: advice_t = 4;
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pub const ADVICE_NOREUSE: advice_t = 5;
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pub const clockid_t = u32;
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pub const CLOCK = struct {
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pub const REALTIME: clockid_t = 0;
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pub const MONOTONIC: clockid_t = 1;
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pub const PROCESS_CPUTIME_ID: clockid_t = 2;
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pub const THREAD_CPUTIME_ID: clockid_t = 3;
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};
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pub const device_t = u64;
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pub const dircookie_t = u64;
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pub const DIRCOOKIE_START: dircookie_t = 0;
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pub const dirnamlen_t = u32;
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pub const dirent_t = extern struct {
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d_next: dircookie_t,
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d_ino: inode_t,
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d_namlen: dirnamlen_t,
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d_type: filetype_t,
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};
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pub const errno_t = enum(u16) {
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SUCCESS = 0,
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@"2BIG" = 1,
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ACCES = 2,
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ADDRINUSE = 3,
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ADDRNOTAVAIL = 4,
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AFNOSUPPORT = 5,
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/// This is also the error code used for `WOULDBLOCK`.
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AGAIN = 6,
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ALREADY = 7,
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BADF = 8,
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BADMSG = 9,
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BUSY = 10,
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CANCELED = 11,
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CHILD = 12,
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CONNABORTED = 13,
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CONNREFUSED = 14,
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CONNRESET = 15,
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DEADLK = 16,
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DESTADDRREQ = 17,
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DOM = 18,
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DQUOT = 19,
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EXIST = 20,
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FAULT = 21,
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FBIG = 22,
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HOSTUNREACH = 23,
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IDRM = 24,
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ILSEQ = 25,
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INPROGRESS = 26,
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INTR = 27,
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INVAL = 28,
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IO = 29,
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ISCONN = 30,
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ISDIR = 31,
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LOOP = 32,
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MFILE = 33,
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MLINK = 34,
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MSGSIZE = 35,
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MULTIHOP = 36,
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NAMETOOLONG = 37,
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NETDOWN = 38,
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NETRESET = 39,
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NETUNREACH = 40,
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NFILE = 41,
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NOBUFS = 42,
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NODEV = 43,
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NOENT = 44,
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NOEXEC = 45,
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NOLCK = 46,
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NOLINK = 47,
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NOMEM = 48,
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NOMSG = 49,
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NOPROTOOPT = 50,
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NOSPC = 51,
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NOSYS = 52,
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NOTCONN = 53,
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NOTDIR = 54,
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NOTEMPTY = 55,
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NOTRECOVERABLE = 56,
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NOTSOCK = 57,
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/// This is also the code used for `NOTSUP`.
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OPNOTSUPP = 58,
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NOTTY = 59,
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NXIO = 60,
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OVERFLOW = 61,
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OWNERDEAD = 62,
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PERM = 63,
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PIPE = 64,
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PROTO = 65,
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PROTONOSUPPORT = 66,
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PROTOTYPE = 67,
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RANGE = 68,
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ROFS = 69,
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SPIPE = 70,
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SRCH = 71,
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STALE = 72,
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TIMEDOUT = 73,
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TXTBSY = 74,
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XDEV = 75,
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NOTCAPABLE = 76,
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_,
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};
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pub const E = errno_t;
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pub const event_t = extern struct {
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userdata: userdata_t,
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@"error": errno_t,
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@"type": eventtype_t,
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fd_readwrite: eventfdreadwrite_t,
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};
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pub const eventfdreadwrite_t = extern struct {
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nbytes: filesize_t,
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flags: eventrwflags_t,
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};
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pub const eventrwflags_t = u16;
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pub const EVENT_FD_READWRITE_HANGUP: eventrwflags_t = 0x0001;
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pub const eventtype_t = u8;
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pub const EVENTTYPE_CLOCK: eventtype_t = 0;
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pub const EVENTTYPE_FD_READ: eventtype_t = 1;
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pub const EVENTTYPE_FD_WRITE: eventtype_t = 2;
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pub const exitcode_t = u32;
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pub const fd_t = i32;
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pub const fdflags_t = u16;
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pub const FDFLAG = struct {
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pub const APPEND: fdflags_t = 0x0001;
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pub const DSYNC: fdflags_t = 0x0002;
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pub const NONBLOCK: fdflags_t = 0x0004;
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pub const RSYNC: fdflags_t = 0x0008;
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pub const SYNC: fdflags_t = 0x0010;
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};
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pub const fdstat_t = extern struct {
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fs_filetype: filetype_t,
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fs_flags: fdflags_t,
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fs_rights_base: rights_t,
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fs_rights_inheriting: rights_t,
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};
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pub const filedelta_t = i64;
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pub const filesize_t = u64;
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pub const filestat_t = extern struct {
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dev: device_t,
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ino: inode_t,
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filetype: filetype_t,
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nlink: linkcount_t,
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size: filesize_t,
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atim: timestamp_t,
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mtim: timestamp_t,
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ctim: timestamp_t,
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pub fn atime(self: filestat_t) timespec {
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return timespec.fromTimestamp(self.atim);
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}
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pub fn mtime(self: filestat_t) timespec {
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return timespec.fromTimestamp(self.mtim);
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}
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pub fn ctime(self: filestat_t) timespec {
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return timespec.fromTimestamp(self.ctim);
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}
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};
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/// Also known as `FILETYPE`.
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pub const filetype_t = enum(u8) {
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UNKNOWN,
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BLOCK_DEVICE,
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CHARACTER_DEVICE,
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DIRECTORY,
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REGULAR_FILE,
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SOCKET_DGRAM,
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SOCKET_STREAM,
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SYMBOLIC_LINK,
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_,
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};
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pub const fstflags_t = u16;
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pub const FILESTAT_SET_ATIM: fstflags_t = 0x0001;
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pub const FILESTAT_SET_ATIM_NOW: fstflags_t = 0x0002;
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pub const FILESTAT_SET_MTIM: fstflags_t = 0x0004;
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pub const FILESTAT_SET_MTIM_NOW: fstflags_t = 0x0008;
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pub const inode_t = u64;
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pub const ino_t = inode_t;
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pub const linkcount_t = u64;
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pub const lookupflags_t = u32;
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pub const LOOKUP_SYMLINK_FOLLOW: lookupflags_t = 0x00000001;
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pub const oflags_t = u16;
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pub const O = struct {
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pub const CREAT: oflags_t = 0x0001;
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pub const DIRECTORY: oflags_t = 0x0002;
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pub const EXCL: oflags_t = 0x0004;
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pub const TRUNC: oflags_t = 0x0008;
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};
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pub const preopentype_t = u8;
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pub const PREOPENTYPE_DIR: preopentype_t = 0;
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pub const prestat_t = extern struct {
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pr_type: preopentype_t,
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u: prestat_u_t,
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};
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pub const prestat_dir_t = extern struct {
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pr_name_len: usize,
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};
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pub const prestat_u_t = extern union {
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dir: prestat_dir_t,
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};
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pub const riflags_t = u16;
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pub const roflags_t = u16;
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pub const SOCK = struct {
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pub const RECV_PEEK: riflags_t = 0x0001;
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pub const RECV_WAITALL: riflags_t = 0x0002;
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pub const RECV_DATA_TRUNCATED: roflags_t = 0x0001;
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};
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pub const rights_t = u64;
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pub const RIGHT = struct {
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pub const FD_DATASYNC: rights_t = 0x0000000000000001;
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pub const FD_READ: rights_t = 0x0000000000000002;
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pub const FD_SEEK: rights_t = 0x0000000000000004;
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pub const FD_FDSTAT_SET_FLAGS: rights_t = 0x0000000000000008;
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pub const FD_SYNC: rights_t = 0x0000000000000010;
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pub const FD_TELL: rights_t = 0x0000000000000020;
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pub const FD_WRITE: rights_t = 0x0000000000000040;
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pub const FD_ADVISE: rights_t = 0x0000000000000080;
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pub const FD_ALLOCATE: rights_t = 0x0000000000000100;
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pub const PATH_CREATE_DIRECTORY: rights_t = 0x0000000000000200;
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pub const PATH_CREATE_FILE: rights_t = 0x0000000000000400;
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pub const PATH_LINK_SOURCE: rights_t = 0x0000000000000800;
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pub const PATH_LINK_TARGET: rights_t = 0x0000000000001000;
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pub const PATH_OPEN: rights_t = 0x0000000000002000;
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pub const FD_READDIR: rights_t = 0x0000000000004000;
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pub const PATH_READLINK: rights_t = 0x0000000000008000;
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pub const PATH_RENAME_SOURCE: rights_t = 0x0000000000010000;
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pub const PATH_RENAME_TARGET: rights_t = 0x0000000000020000;
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pub const PATH_FILESTAT_GET: rights_t = 0x0000000000040000;
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pub const PATH_FILESTAT_SET_SIZE: rights_t = 0x0000000000080000;
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pub const PATH_FILESTAT_SET_TIMES: rights_t = 0x0000000000100000;
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pub const FD_FILESTAT_GET: rights_t = 0x0000000000200000;
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pub const FD_FILESTAT_SET_SIZE: rights_t = 0x0000000000400000;
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pub const FD_FILESTAT_SET_TIMES: rights_t = 0x0000000000800000;
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pub const PATH_SYMLINK: rights_t = 0x0000000001000000;
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pub const PATH_REMOVE_DIRECTORY: rights_t = 0x0000000002000000;
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pub const PATH_UNLINK_FILE: rights_t = 0x0000000004000000;
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pub const POLL_FD_READWRITE: rights_t = 0x0000000008000000;
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pub const SOCK_SHUTDOWN: rights_t = 0x0000000010000000;
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pub const ALL: rights_t = FD_DATASYNC |
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FD_READ |
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FD_SEEK |
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FD_FDSTAT_SET_FLAGS |
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FD_SYNC |
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FD_TELL |
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FD_WRITE |
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FD_ADVISE |
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FD_ALLOCATE |
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PATH_CREATE_DIRECTORY |
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PATH_CREATE_FILE |
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PATH_LINK_SOURCE |
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PATH_LINK_TARGET |
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PATH_OPEN |
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FD_READDIR |
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PATH_READLINK |
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PATH_RENAME_SOURCE |
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PATH_RENAME_TARGET |
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PATH_FILESTAT_GET |
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PATH_FILESTAT_SET_SIZE |
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PATH_FILESTAT_SET_TIMES |
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FD_FILESTAT_GET |
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FD_FILESTAT_SET_SIZE |
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FD_FILESTAT_SET_TIMES |
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PATH_SYMLINK |
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PATH_REMOVE_DIRECTORY |
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PATH_UNLINK_FILE |
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POLL_FD_READWRITE |
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SOCK_SHUTDOWN;
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};
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pub const sdflags_t = u8;
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pub const SHUT = struct {
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pub const RD: sdflags_t = 0x01;
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pub const WR: sdflags_t = 0x02;
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};
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pub const siflags_t = u16;
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pub const signal_t = u8;
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pub const SIGNONE: signal_t = 0;
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pub const SIGHUP: signal_t = 1;
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pub const SIGINT: signal_t = 2;
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pub const SIGQUIT: signal_t = 3;
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pub const SIGILL: signal_t = 4;
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pub const SIGTRAP: signal_t = 5;
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pub const SIGABRT: signal_t = 6;
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pub const SIGBUS: signal_t = 7;
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pub const SIGFPE: signal_t = 8;
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pub const SIGKILL: signal_t = 9;
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pub const SIGUSR1: signal_t = 10;
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pub const SIGSEGV: signal_t = 11;
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pub const SIGUSR2: signal_t = 12;
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pub const SIGPIPE: signal_t = 13;
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pub const SIGALRM: signal_t = 14;
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pub const SIGTERM: signal_t = 15;
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pub const SIGCHLD: signal_t = 16;
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pub const SIGCONT: signal_t = 17;
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pub const SIGSTOP: signal_t = 18;
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pub const SIGTSTP: signal_t = 19;
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pub const SIGTTIN: signal_t = 20;
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pub const SIGTTOU: signal_t = 21;
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pub const SIGURG: signal_t = 22;
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pub const SIGXCPU: signal_t = 23;
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pub const SIGXFSZ: signal_t = 24;
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pub const SIGVTALRM: signal_t = 25;
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pub const SIGPROF: signal_t = 26;
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pub const SIGWINCH: signal_t = 27;
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pub const SIGPOLL: signal_t = 28;
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pub const SIGPWR: signal_t = 29;
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pub const SIGSYS: signal_t = 30;
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pub const subclockflags_t = u16;
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pub const SUBSCRIPTION_CLOCK_ABSTIME: subclockflags_t = 0x0001;
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pub const subscription_t = extern struct {
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userdata: userdata_t,
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u: subscription_u_t,
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};
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pub const subscription_clock_t = extern struct {
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id: clockid_t,
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timeout: timestamp_t,
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precision: timestamp_t,
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flags: subclockflags_t,
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};
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pub const subscription_fd_readwrite_t = extern struct {
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fd: fd_t,
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};
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pub const subscription_u_t = extern struct {
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tag: eventtype_t,
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u: subscription_u_u_t,
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};
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pub const subscription_u_u_t = extern union {
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clock: subscription_clock_t,
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fd_read: subscription_fd_readwrite_t,
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fd_write: subscription_fd_readwrite_t,
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};
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pub const timestamp_t = u64;
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pub const userdata_t = u64;
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/// Also known as `WHENCE`.
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pub const whence_t = enum(u8) { SET, CUR, END };
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pub const S = struct {
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pub const IEXEC = @compileError("TODO audit this");
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pub const IFBLK = 0x6000;
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pub const IFCHR = 0x2000;
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pub const IFDIR = 0x4000;
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pub const IFIFO = 0xc000;
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pub const IFLNK = 0xa000;
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pub const IFMT = IFBLK | IFCHR | IFDIR | IFIFO | IFLNK | IFREG | IFSOCK;
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pub const IFREG = 0x8000;
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// There's no concept of UNIX domain socket but we define this value here in order to line with other OSes.
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pub const IFSOCK = 0x1;
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};
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pub const LOCK = struct {
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pub const SH = 0x1;
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pub const EX = 0x2;
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pub const NB = 0x4;
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pub const UN = 0x8;
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};
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