z/OS Language Environment Writing Interlanguage Communication Applications
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z/OS UNIX considerations

z/OS Language Environment Writing Interlanguage Communication Applications
SA38-0684-00

In order to create a nested enclave under z/OS UNIX, you must either:
  • Be running with POSIX(OFF) and issue system(), or
  • Be running with POSIX(ON) and have set the environment variables to signal that you want to establish a nested enclave. You can use the __POSIX_SYSTEM environment variable to cause a system() to establish a nested enclave instead of performing a fork()/exec(). __POSIX_SYSTEM can be set to NO, No, or no.

In a multiple enclave environment, the first enclave must be running with POSIX(ON) and all other nested enclaves must be running with POSIX(OFF).

Parent topic: Creating child enclaves using the C system() function

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