# Predefined Constants

The constants below are defined by this extension, and will only be available when the extension has either been compiled into PHP or dynamically loaded at runtime.

`F_DUPFD` (int)

`F_GETFD` (int)

`F_GETFL` (int)

`F_GETLK` (int)

`F_GETOWN` (int)

`F_RDLCK` (int)

`F_SETFL` (int)

`F_SETLK` (int)

`F_SETLKW` (int)

`F_SETOWN` (int)

`F_UNLCK` (int)

`F_WRLCK` (int)

`O_APPEND` (int)

`O_ASYNC` (int)

`O_CREAT` (int)

`O_EXCL` (int)

`O_NDELAY` (int)

`O_NOCTTY` (int)

`O_NONBLOCK` (int)

`O_RDONLY` (int)

`O_RDWR` (int)

`O_SYNC` (int)

`O_TRUNC` (int)

`O_WRONLY` (int)

`S_IRGRP` (int)

`S_IROTH` (int)

`S_IRUSR` (int)

`S_IRWXG` (int)

`S_IRWXO` (int)

`S_IRWXU` (int)

`S_IWGRP` (int)

`S_IWOTH` (int)

`S_IWUSR` (int)

`S_IXGRP` (int)

`S_IXOTH` (int)

`S_IXUSR` (int)