psignal() produces a short message on the standard error file describing the indicated signal. First the argument string s is printed, then a colon, then
the name of the signal and a NEWLINE. Most usefully, the argument string is the name of the program which incurred the signal. The signal number should be from among those
found in <signal.h>.
To simplify variant formatting of signal names, the vector of message strings sys_siglist is provided; the signal number can be used as an index in this table to get the signal
name without the newline. The define NSIG defined in <signal.h> is the number of messages provided for in the table; it should be checked
because new signals may be added to the system before they are added to the table.
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