[Overview][Constants][Types][Procedures and functions][Index] | Reference for unit 'ipc' (#rtl)

# ftok

Create token from filename

## Declaration

Source position: ipc.pp line 208

`function ftok(`
`Path: PChar;`
`ID: cint`
`):TKey;`

## Description

ftok returns a key that can be used in a semget shmget or msgget call to access a new or existing IPC resource.

Path is the name of a file in the file system, ID is a character of your choice. The ftok call does the same as it's C counterpart, so a pascal program and a C program will access the same resource if they use the same Path and ID

For an example, see msgctl, semctl or shmctl.

## Errors

ftok returns -1 if the file in Path doesn't exist.

## See also

semget |  | Return the ID of a semaphore set, possibly creating the set
shmget |  | Return the ID of a shared memory block, possibly creating it
msgget |  | Return message queue ID, possibly creating the queue

Documentation generated on: May 14 2021