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The
function locates the descriptive message string for the given signal number
and writes it to the standard error. If the argument is it is written
to the standard error file descriptor prior to the message string, immediately
followed by a colon and a space. If the signal number is not recognized
the string is produced. The message strings can be accessed directly
using the external array indexed by recognized signal numbers. The external
array is used similarly and contains short, upper-case abbreviations for
signals which are useful for recognizing signal names in user input. The
defined variable contains a count of the strings in and
The function appeared in
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