Defect in XSH sigemptyset, sigfill

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        Defect report from : Alexander A. Sortov , ISP RAS (Linux Verification 
Center)

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@ page 0 line 0 section sigemptyset, sigfill comment {LVC-S0046}

Problem:

Edition of Specification (Year): 2004

Defect code :  2. Omission

The 'Return value' section for functions sigemptyset() and sigfillset() states 
that in case of not successful completion the functions "shall return -1 and 
set errno to indicate the error". However, the 'Errors' section for the both 
functions states that "no errors are defined".

Action:

Define the possible error codes or remove the sentence "and set errno to 
indicate the error" from the description in 'Return value' section for the case 
of not successful completion.