Function openDirZ [src]

Same as openDir except the parameter is null-terminated.

Prototype

pub fn openDirZ(self: Dir, sub_path_c: [*:0]const u8, args: OpenOptions) OpenError!Dir

Parameters

self: Dirsub_path_c: [*:0]const u8args: OpenOptions

Possible Errors

AccessDenied

BadPathName

DeviceBusy

FileNotFound

InvalidUtf8

WASI-only; file paths must be valid UTF-8.

InvalidWtf8

Windows-only; file paths provided by the user must be valid WTF-8. https://simonsapin.github.io/wtf-8/

NameTooLong

NetworkNotFound

On Windows, \\server or \\server\share was not found.

NoDevice

NotDir

PermissionDenied

ProcessFdQuotaExceeded

SymLinkLoop

SystemFdQuotaExceeded

SystemResources

Unexpected UnexpectedError

The Operating System returned an undocumented error code.

This error is in theory not possible, but it would be better to handle this error than to invoke undefined behavior.

When this error code is observed, it usually means the Zig Standard Library needs a small patch to add the error code to the error set for the respective function.

Source

  pub fn openDirZ(self: Dir, sub_path_c: [*:0]const u8, args: OpenOptions) OpenError!Dir {
    switch (native_os) {
        .windows => {
            const sub_path_w = try windows.cStrToPrefixedFileW(self.fd, sub_path_c);
            return self.openDirW(sub_path_w.span().ptr, args);
        },
        // Use the libc API when libc is linked because it implements things
        // such as opening absolute directory paths.
        .wasi => if (!builtin.link_libc) {
            return openDir(self, mem.sliceTo(sub_path_c, 0), args);
        },
        .haiku => {
            const rc = posix.system._kern_open_dir(self.fd, sub_path_c);
            if (rc >= 0) return .{ .fd = rc };
            switch (@as(posix.E, @enumFromInt(rc))) {
                .FAULT => unreachable,
                .INVAL => unreachable,
                .BADF => unreachable,
                .ACCES => return error.AccessDenied,
                .LOOP => return error.SymLinkLoop,
                .MFILE => return error.ProcessFdQuotaExceeded,
                .NAMETOOLONG => return error.NameTooLong,
                .NFILE => return error.SystemFdQuotaExceeded,
                .NODEV => return error.NoDevice,
                .NOENT => return error.FileNotFound,
                .NOMEM => return error.SystemResources,
                .NOTDIR => return error.NotDir,
                .PERM => return error.PermissionDenied,
                .BUSY => return error.DeviceBusy,
                else => |err| return posix.unexpectedErrno(err),
            }
        },
        else => {},
    }

    var symlink_flags: posix.O = switch (native_os) {
        .wasi => .{
            .read = true,
            .NOFOLLOW = args.no_follow,
            .DIRECTORY = true,
        },
        else => .{
            .ACCMODE = .RDONLY,
            .NOFOLLOW = args.no_follow,
            .DIRECTORY = true,
            .CLOEXEC = true,
        },
    };

    if (@hasField(posix.O, "PATH") and !args.iterate)
        symlink_flags.PATH = true;

    return self.openDirFlagsZ(sub_path_c, symlink_flags);
}  