freebsd-skq/lib/libc/gen/psignal.3

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.\" Copyright (c) 1983, 1991, 1993
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.\" @(#)psignal.3 8.2 (Berkeley) 2/27/95
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.\" $FreeBSD$
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.\"
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.Dd February 27, 1995
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.Dt PSIGNAL 3
.Os BSD 4.2
.Sh NAME
.Nm psignal ,
.Nm strsignal ,
.Nm sys_siglist ,
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.Nm sys_signame
.Nd system signal messages
.Sh LIBRARY
.Lb libc
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.Sh SYNOPSIS
.Fd #include <signal.h>
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.Ft void
.Fn psignal "unsigned sig" "const char *s"
.Vt extern const char * const sys_siglist[];
.Vt extern const char * const sys_signame[];
.Fd #include <string.h>
.Ft "char *"
.Fn strsignal "int sig"
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.Sh DESCRIPTION
The
.Fn psignal
and
.Fn strsignal
functions locate the descriptive message
string for a signal number.
.Pp
The
.Fn strsignal
function accepts a signal number argument
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.Fa sig
and returns a pointer to the corresponding message string.
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.Pp
The
.Fn psignal
function accepts an signal number argument
.Fa sig
and writes it to the standard error.
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If the argument
.Fa s
is
.Pf non- Dv NULL
and does not point to the null character,
.Fa s
is written to the standard error file descriptor
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prior to the message string,
immediately followed by a colon and a space.
If the signal number is not recognized
.Pq Xr sigaction 2 ,
the string
.Dq "Unknown signal
is produced.
.Pp
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, lower-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
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.Sh HISTORY
The
.Fn psignal
function appeared in
.Bx 4.2 .