BSD 2.11 - man page for psignal (bsd section 3)
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psignal, sys_siglist - system signal messages
Psignal produces a short message on the standard error file describing the indicated sig-
nal. First the argument string s is printed, then a colon, then the name of the signal
and a new-line. 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.
4.2 Berkeley Distribution May 15, 1985 PSIGNAL(3)
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