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Old 11-30-2006, 06:56 AM   #1
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errno implementation

Hello All,

I was curious on the implementation of errno in errno.h

Is errno stored in the task context for each process?


Old 12-01-2006, 10:57 AM   #2
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According to the IEEE Std 1003.1 (aka POSIX) standard to which most implementations comply,
For each thread of a process, the value of errno shall not be affected by function calls or assignments to errno by other threads.
Does this answer your question?
Old 12-06-2006, 06:39 AM   #3
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Thanks for the prompt response.

I was curious to know where exactly errno will be stored from a process' perpective.

ie is it stored in the task context of the process just like global variables which will be modified when any (non-successful) system calls are made?




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