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POSIX

POSIX is a registered trademark from the IEEE. The following assertions are derived from copyrighted material. Original text and copyright information can be found at http://www.opengroup.org.

Here is what POSIX requires for this function:

1. pthread_atfork registers the 'prepare' handler to be called before fork() processing in the context of the fork() calling thread.
   
2. pthread_atfork registers the 'parent' handler to be called after fork() processing in the context of the fork() calling thread in the parent process.
   
3. pthread_atfork registers the 'child' handler to be called after fork() processing in the context of the fork() calling thread in the child process.
   
4. NULL can be passed as any of these handlers when no treatment is required.
   
5. When pthread_atfork is called several times, the prepare handlers are executed in reversed order as they were registered, and child and parent handlers are executed in the same order as they were registered.
   
6. If there is not enough memory to store handler adresses, the function returns ENOMEM.
   
7. The function does not return EINTR.
   

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Conformance Status

• Assertion 1 is partially tested in OPTS. A new testcase will be written to test when pthread_atfork is called from a different thread than the fork() caller.
  
• Assertion 2 is partially tested in OPTS. A new testcase will be written to test when pthread_atfork is called from a different thread than the fork() caller.
  
• Assertion 3 is not currently tested. A new testcase will be written.
  
• Assertion 4 is partially tested in OPTS. A new testcase will be written to test different combinations of NULL/not-null parameters.
  
• Assertion 5 is not currently tested. A new testcase will be written.
  
• Assertion 6 is not currently tested. A new testcase will be written.
  
• Assertion 7 is not currently tested. A new testcase will be written.
  

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Scalability & Stress Status

By its nature, this function does not need this kind of testing (it is not meant to be called intensively).

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Conformance Tests

New tests have been added to the Open POSIX Test Suite:

• 1-2.c
  
• 2-2.c
  
• 3-2.c
  
• 3-3.c
  
• 4-1.c