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BSD 2.11 - man page for sys_siglist (bsd section 3)

PSIGNAL(3)						     Library Functions Manual							PSIGNAL(3)

psignal, sys_siglist - system signal messages
psignal(sig, s) unsigned sig; char *s; char *sys_siglist[];
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 new-line. Most usefully, the argument string is the name of the program which incurred the sig- nal. 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.
sigvec(2), perror(3) 4.2 Berkeley Distribution May 15, 1985 PSIGNAL(3)