Tokens

Many tokens flow across the server interface. The types of tokens are:

VFS: Represents a mounted file system.
vnode: Represents a file or directory that is currently in use. This identifier is valid only until the token is released, using the v_rel callable service.
FID: Uniquely identifies a file or directory in a particular mounted file system. The file or directory may or may not be currently in use. This identifier is valid across mounting and unmounting of the file system, as well as across z/OS UNIX re-IPLs.

You must specify tokens as variable names, not as strings. See Specifying a syscall command for information about specifying variable names. When a token is returned to the exec, the value of the token is stored in the variable. When a token variable is used as a parameter on a syscall command, the token value is extracted from the variable. The format for a token is 8 bytes of binary data.