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5.38 strsignal—convert signal number to string

Synopsis 

     #include <string.h>
     char *strsignal(int signal);

Description
strsignal converts the signal number signal into a string. If signal is not a known signal number, the result will be of the form "Unknown signal NN" where NN is the signal is a decimal number.
Returns
This function returns a pointer to a string. Your application must not modify that string.
Portability
POSIX.1-2008 C requires strsignal, but does not specify the strings used for each signal number.

strsignal requires no supporting OS subroutines.