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package sys
// Oflag are flags used for FS.OpenFile. Values, including zero, should not be
// interpreted numerically. Instead, use by constants prefixed with 'O_' with
// special casing noted below.
//
// # Notes
//
// - O_RDONLY, O_RDWR and O_WRONLY are mutually exclusive, while the other
// flags can coexist bitwise.
// - This is like `flag` in os.OpenFile and `oflag` in POSIX. See
// https://pubs.opengroup.org/onlinepubs/9699919799/functions/open.html
type Oflag uint32
// This is a subset of oflags to reduce implementation burden. `wasip1` splits
// these across `oflags` and `fdflags`. We can't rely on the Go `os` package,
// as it is missing some values. Any flags added will be defined in POSIX
// order, as needed by functions that explicitly document accepting them.
//
// https://github.com/WebAssembly/WASI/blob/snapshot-01/phases/snapshot/docs.md#-oflags-flagsu16
// https://github.com/WebAssembly/WASI/blob/snapshot-01/phases/snapshot/docs.md#-fdflags-flagsu16
const (
// O_RDONLY is like os.O_RDONLY
O_RDONLY Oflag = iota
// O_RDWR is like os.O_RDWR
O_RDWR
// O_WRONLY is like os.O_WRONLY
O_WRONLY
// Define bitflags as they are in POSIX `open`: alphabetically
// O_APPEND is like os.O_APPEND
O_APPEND Oflag = 1 << iota
// O_CREAT is link os.O_CREATE
O_CREAT
// O_DIRECTORY is defined on some platforms as syscall.O_DIRECTORY.
//
// Note: This ensures that the opened file is a directory. Those emulating
// on platforms that don't support the O_DIRECTORY, can double-check the
// result with File.IsDir (or stat) and err if not a directory.
O_DIRECTORY
// O_DSYNC is defined on some platforms as syscall.O_DSYNC.
O_DSYNC
// O_EXCL is defined on some platforms as syscall.O_EXCL.
O_EXCL
// O_NOFOLLOW is defined on some platforms as syscall.O_NOFOLLOW.
//
// Note: This allows programs to ensure that if the opened file is a
// symbolic link, the link itself is opened instead of its target.
O_NOFOLLOW
// O_NONBLOCK is defined on some platforms as syscall.O_NONBLOCK.
O_NONBLOCK
// O_RSYNC is defined on some platforms as syscall.O_RSYNC.
O_RSYNC
// O_SYNC is defined on some platforms as syscall.O_SYNC.
O_SYNC
// O_TRUNC is defined on some platforms as syscall.O_TRUNC.
O_TRUNC
)
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