Each loaded process starts with an identical set of environment variables. Modifying a process environment affects only that process. Environments are not currently inherited on process creation.

On INtime for Windows, the environment is determined by the contents of the "Node Management->Advanced->CLIB" section and the value of certain Windows environment variables if they exist.

On INtime Distributed RTOS, the environment is determined by the [CLIB] section of the rtconfig.sys file.

Note that some Windows-sourced environment variables may have different values depending on how the application is loaded. If a process is loaded by the logged-in user or from an INtime application while a user is logged in, the environment variables are copied from the environment of the logged-in user. If an application is loaded by the autoloader, or while no user is logged in to Windows, then the environment variables are copied from those of the SYSTEM user. This is because the autoloader is run by the INtime Kernel Service which runs in the context of the SYSTEM user. If no user is logged in then a process loaded from an INtime application will be loaded by the INtime I/O service, which also runs in the context of the SYSTEM user.

An example of an environment variable which changes depending on the user context is the TEMP variable which indicates the folder where temporary files are stored. The SYSTEM user value for this variable is typically C:\Windows\temp. A logged-in user TEMP path is typically C:\users\USERNAME\AppData\Local\temp.

Common environment variables

INTIME

The root path of the INTIME installation

TEMP

The path to the temporary working directory

TZ

POSIX format time zone string

NODECFG

The path to configuration files for this node

INtime for Windows additional variables

USERNAME

Windows user name

USERPROFILE

The path to the Windows user profile

INtime Distributed RTOS additional variables

PATH

The search path for loading RSLs

Legacy Network stack variables

DEFHOSTNAME

The default host name for this network node

HOSTSFILE

The path to the 'hosts' file

NETWORKSFILE

The path to the 'networks' file

PROTOSFILE

The path to the 'protocols' file

SERVICESFILE

The path to the 'services' file

INTIMEVEMACADDR

The MAC address for the legacy virtual ethernet adapter driver

Environment system calls

To . . .	Use this system call . . .
Return the value of an environment variable by name	GetRtEnvironmentVariable
Return the value of an environment variable by its index	GetRtEnvironmentVariableByIndex
Create a new environment variable or modify an existing one	PutRtEnvironmentVariable
Remove an environment variable from the current process	DeleteRtEnvironmentVariable