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@(#)psignal.3 8.2 (Berkeley) 2/27/95
$FreeBSD: releng/10.2/lib/libc/gen/psignal.3 233510 2012-03-26 15:18:14Z joel $
.Dd February 4, 2011 .Dt PSIGNAL 3 .Os .Sh NAME .Nm psignal , .Nm strsignal , .Nm sys_siglist , .Nm sys_signame .Nd system signal messages .Sh LIBRARY .Lb libc .Sh SYNOPSIS n signal.h .Ft void .Fn psignal "unsigned sig" "const char *s" .Vt extern const char * const sys_siglist[] ; .Vt extern const char * const sys_signame[] ; n string.h .Ft "char *" .Fn strsignal "int sig" .Sh DESCRIPTION The .Fn psignal and .Fn strsignal functions locate the descriptive message string for a signal number.
p The .Fn strsignal function accepts a signal number argument .Fa sig and returns a pointer to the corresponding message string.
p The .Fn psignal function accepts a signal number argument .Fa sig and writes it to the standard error. If the argument .Fa s is
f non- Dv NULL and does not point to the null character, .Fa s 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
q Xr sigaction 2 , the string .Dq "Unknown signal" is produced.
p The message strings can be accessed directly through the external array .Va sys_siglist , indexed by recognized signal numbers. The external array .Va sys_signame is used similarly and contains short, upper-case abbreviations for signals which are useful for recognizing signal names in user input. The defined variable .Dv NSIG contains a count of the strings in .Va sys_siglist and .Va sys_signame . .Sh SEE ALSO .Xr sigaction 2 , .Xr perror 3 , .Xr strerror 3 .Sh HISTORY The .Fn psignal function appeared in x 4.2 .