key_t ftok(const char *path, int id);
Points to a path upon which part of the key is formed.
Is the character upon which part of the key is formed.
Search permission is denied for a component of the path prefix.
The length of the path argument exceeds PATH_MAX or a path name component is longer than NAME_MAX.
A component of path does not name an existing file or path is an empty string.
A component of the path prefix is not a directory.
UNIX 98 with exceptions.
Keys are only guaranteed to be unique for files on locally-mounted NTFS file systems.
PTC MKS Toolkit for Professional Developers
PTC MKS Toolkit for Professional Developers 64-Bit Edition
PTC MKS Toolkit for Enterprise Developers
PTC MKS Toolkit for Enterprise Developers 64-Bit Edition
PTC MKS Toolkit 10.1 patch 1 Documentation Build 2.