Where is SHM_FAILED defined in RHEL?

Solution Unverified - Updated -

Issue

We are porting an application from HP-UX and found that SHM_FAILED does not exist on RHEL. On HP-UX it has the following meaning
in the shmat() system call:

If the calling process is already attached to the shared memory
segment, shmat() fails and returns SHM_FAILED regardless of what value
is passed in shmaddr.  See exceptions for MPAS processes below.

How is it defined on RHEL?

Environment

  • Red Hat Enterprise Linux

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