shmop C binding

Usage

const shmop = require('@iqrok/shmop');

Methods

setPath(path)

• Descriptions set path to generate token with ftok()
• Parameter(s)
  • path [String] path to existing file

getToken(id, path = null)

• Descriptions generate token with ftok()
• Parameter(s)
  • id [Number] number from 1 - 255. if 0 is passed as id, it will throw error
  • path (optional) use path defined via this parameter instead of global path defined via setPath()
• Return [Number] generated token

read(id, type)

• Descriptions read shared memory block pointed by the provided token
• Parameter(s)
  • id [Number] if id <= 255, then it will be passed to getToken(), otherwise it will be treated as the token
  • type [String] data type that will be read
• Return [Number] Read shared memory

write(id, value, type)

• Descriptions read shared memory block pointed by the provided token
• Parameter(s)
  • id [Number] if id <= 255, then it will be passed to getToken(), otherwise it will be treated as the token
  • value [Number] value that will be written to shared memory block
  • type [String] data type that will be read
• Return [Number] Read shared memory

Valid Data Types

|Type|Description| |---|---| |uint8|8-bit unsigned integer| |int8|8-bit signed integer| |uint16|16-bit unsigned integer| |int16|16-bit signed integer| |uint32|32-bit unsigned integer| |int32|32-bit signed integer| |float|32-bit single precision floating number| |double|64-bit double precision floating number|