diff options
Diffstat (limited to 'vendor/github.com/tetratelabs/wazero/experimental/sys/oflag.go')
| -rw-r--r-- | vendor/github.com/tetratelabs/wazero/experimental/sys/oflag.go | 70 |
1 files changed, 70 insertions, 0 deletions
diff --git a/vendor/github.com/tetratelabs/wazero/experimental/sys/oflag.go b/vendor/github.com/tetratelabs/wazero/experimental/sys/oflag.go new file mode 100644 index 000000000..39ebd378f --- /dev/null +++ b/vendor/github.com/tetratelabs/wazero/experimental/sys/oflag.go @@ -0,0 +1,70 @@ +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 +) |