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When not compiling -DSMALL permit use of names RTMIN[+n] and RTMAX[-n]

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(where n is a decimal integer in the range [0 .. SIGRTMAX-SIGRTMIN].
As usual a leading "sig" is ignored and the strings are case independent.

Some implementations do not name the real time signals, and using
labels like RTMIN+3 can be the only way they can be manipulated,
so allow that technique (we still return the RTnn names on the inverse
translation though).

Because this is used by both kill(1) and sh(1) the kill and trap
commands both gain access to the new notation (when !SMALL).
This commit is contained in:
kre 2020-08-20 22:56:56 +00:00
parent 1690246c02
commit 631837b7c6
2 changed files with 52 additions and 3 deletions
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16
lib/libc/gen/signalname.3
View File

@ -1,4 +1,4 @@
.\" $NetBSD: signalname.3,v 1.2 2017/05/14 12:35:46 wiz Exp $
.\" $NetBSD: signalname.3,v 1.3 2020/08/20 22:56:56 kre Exp $
.\"
.\" Available to all and sundry, without restriction on use, or other
.\" limitations, and without fee. Also without any warranty of fitness
@ -76,6 +76,17 @@ prefix in
.Fa name
is ignored.
.Pp
This implementation also accepts
.Dv rtmax Ns \&[\-n]
and
.Dv rtmin Ns \&[+n]
.Po
where the optional
.Ar n
is a decimal integer between 0 and SIGRTMAX\-SIGRTMIN
.Pc
to refer to the real time signals.
.Pp
The
.Fn signalnumber
function returns the signal number,
@ -93,7 +104,8 @@ signal number.
.Pp
The
.Fn signalnext
function returns minus one (\-1) on error, if the given signal
function returns minus one (\-1) on error,
that is, if the given signal
.Fa sig
is neither a valid signal number nor zero.
It returns zero when the input signal number,

39
lib/libc/gen/signalnumber.c
View File

@ -1,4 +1,4 @@
/* $NetBSD: signalnumber.c,v 1.2 2018/01/04 20:57:29 kamil Exp $ */
/* $NetBSD: signalnumber.c,v 1.3 2020/08/20 22:56:56 kre Exp $ */
/*
* Software available to all and sundry without limitations
@ -20,7 +20,9 @@
#include "namespace.h"
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
/*
* signalnumber()
@ -42,6 +44,10 @@ int
signalnumber(const char *name)
{
int i;
#ifndef SMALL
long offs;
char *ep;
#endif
if (strncasecmp(name, "sig", 3) == 0)
name += 3;
@ -50,5 +56,36 @@ signalnumber(const char *name)
if (sys_signame[i] != NULL &&
strcasecmp(name, sys_signame[i]) == 0)
return i;
#ifndef SMALL
if (strncasecmp(name, "rtm", 3) == 0) {
name += 3;
if (strncasecmp(name, "ax", 2) == 0)
i = SIGRTMAX;
else if (strncasecmp(name, "in", 2) == 0)
i = SIGRTMIN;
else
return 0;
name += 2;
if (name[0] == '\0')
return i;
if (i == SIGRTMAX && name[0] != '-')
return 0;
if (i == SIGRTMIN && name[0] != '+')
return 0;
if (!isdigit((unsigned char)name[1]))
return 0;
offs = strtol(name+1, &ep, 10);
if (ep == name+1 || *ep != '\0' ||
offs < 0 || offs > SIGRTMAX-SIGRTMIN)
return 0;
if (name[0] == '+')
i += (int)offs;
else
i -= (int)offs;
if (i >= SIGRTMIN && i <= SIGRTMAX)
return i;
}
#endif
return 0;
}