Open and possibly create a file. Keeps trying if it gets interrupted.
file_path is relative to the open directory handle dir_fd.
On Windows, file_path should be encoded as WTF-8.
On WASI, file_path should be encoded as valid UTF-8.
On other platforms, file_path is an opaque sequence of bytes with no particular encoding.
See also openat.
pub fn openatZ(dir_fd: fd_t, file_path: [*:0]const u8, flags: O, mode: mode_t) OpenError!fd_tpub fn openatZ(dir_fd: fd_t, file_path: [*:0]const u8, flags: O, mode: mode_t) OpenError!fd_t {
if (native_os == .windows) {
@compileError("Windows does not support POSIX; use Windows-specific API or cross-platform std.fs API");
} else if (native_os == .wasi and !builtin.link_libc) {
return openat(dir_fd, mem.sliceTo(file_path, 0), flags, mode);
}
const openat_sym = if (lfs64_abi) system.openat64 else system.openat;
while (true) {
const rc = openat_sym(dir_fd, file_path, flags, mode);
switch (errno(rc)) {
.SUCCESS => return @intCast(rc),
.INTR => continue,
.FAULT => unreachable,
.INVAL => return error.BadPathName,
.BADF => unreachable,
.ACCES => return error.AccessDenied,
.FBIG => return error.FileTooBig,
.OVERFLOW => return error.FileTooBig,
.ISDIR => return error.IsDir,
.LOOP => return error.SymLinkLoop,
.MFILE => return error.ProcessFdQuotaExceeded,
.NAMETOOLONG => return error.NameTooLong,
.NFILE => return error.SystemFdQuotaExceeded,
.NODEV => return error.NoDevice,
.NOENT => return error.FileNotFound,
.SRCH => return error.FileNotFound,
.NOMEM => return error.SystemResources,
.NOSPC => return error.NoSpaceLeft,
.NOTDIR => return error.NotDir,
.PERM => return error.PermissionDenied,
.EXIST => return error.PathAlreadyExists,
.BUSY => return error.DeviceBusy,
.OPNOTSUPP => return error.FileLocksUnsupported,
.AGAIN => return error.WouldBlock,
.TXTBSY => return error.FileBusy,
.NXIO => return error.NoDevice,
.ILSEQ => return error.BadPathName,
else => |err| return unexpectedErrno(err),
}
}
}