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emacs/lib/sig2str.c

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/* sig2str.c -- convert between signal names and numbers
Copyright (C) 2002, 2004, 2006, 2009-2021 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <https://www.gnu.org/licenses/>. */
/* Written by Paul Eggert. */
#include <config.h>
#include <limits.h>
#include <signal.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include "sig2str.h"
#ifndef SIGRTMIN
# define SIGRTMIN 0
# undef SIGRTMAX
#endif
#ifndef SIGRTMAX
# define SIGRTMAX (SIGRTMIN - 1)
#endif
#define NUMNAME(name) { SIG##name, #name }
/* Signal names and numbers. Put the preferred name first. */
static struct numname { int num; char const name[8]; } numname_table[] =
{
/* Signals required by POSIX 1003.1-2001 base, listed in
traditional numeric order where possible. */
#ifdef SIGHUP
NUMNAME (HUP),
#endif
#ifdef SIGINT
NUMNAME (INT),
#endif
#ifdef SIGQUIT
NUMNAME (QUIT),
#endif
#ifdef SIGILL
NUMNAME (ILL),
#endif
#ifdef SIGTRAP
NUMNAME (TRAP),
#endif
#ifdef SIGABRT
NUMNAME (ABRT),
#endif
#ifdef SIGFPE
NUMNAME (FPE),
#endif
#ifdef SIGKILL
NUMNAME (KILL),
#endif
#ifdef SIGSEGV
NUMNAME (SEGV),
#endif
/* On Haiku, SIGSEGV == SIGBUS, but we prefer SIGSEGV to match
strsignal.c output, so SIGBUS must be listed second. */
#ifdef SIGBUS
NUMNAME (BUS),
#endif
#ifdef SIGPIPE
NUMNAME (PIPE),
#endif
#ifdef SIGALRM
NUMNAME (ALRM),
#endif
#ifdef SIGTERM
NUMNAME (TERM),
#endif
#ifdef SIGUSR1
NUMNAME (USR1),
#endif
#ifdef SIGUSR2
NUMNAME (USR2),
#endif
#ifdef SIGCHLD
NUMNAME (CHLD),
#endif
#ifdef SIGURG
NUMNAME (URG),
#endif
#ifdef SIGSTOP
NUMNAME (STOP),
#endif
#ifdef SIGTSTP
NUMNAME (TSTP),
#endif
#ifdef SIGCONT
NUMNAME (CONT),
#endif
#ifdef SIGTTIN
NUMNAME (TTIN),
#endif
#ifdef SIGTTOU
NUMNAME (TTOU),
#endif
/* Signals required by POSIX 1003.1-2001 with the XSI extension. */
#ifdef SIGSYS
NUMNAME (SYS),
#endif
#ifdef SIGPOLL
NUMNAME (POLL),
#endif
#ifdef SIGVTALRM
NUMNAME (VTALRM),
#endif
#ifdef SIGPROF
NUMNAME (PROF),
#endif
#ifdef SIGXCPU
NUMNAME (XCPU),
#endif
#ifdef SIGXFSZ
NUMNAME (XFSZ),
#endif
/* Unix Version 7. */
#ifdef SIGIOT
NUMNAME (IOT), /* Older name for ABRT. */
#endif
#ifdef SIGEMT
NUMNAME (EMT),
#endif
/* USG Unix. */
#ifdef SIGPHONE
NUMNAME (PHONE),
#endif
#ifdef SIGWIND
NUMNAME (WIND),
#endif
/* Unix System V. */
#ifdef SIGCLD
NUMNAME (CLD),
#endif
#ifdef SIGPWR
NUMNAME (PWR),
#endif
/* GNU/Linux 2.2 and Solaris 8. */
#ifdef SIGCANCEL
NUMNAME (CANCEL),
#endif
#ifdef SIGLWP
NUMNAME (LWP),
#endif
#ifdef SIGWAITING
NUMNAME (WAITING),
#endif
#ifdef SIGFREEZE
NUMNAME (FREEZE),
#endif
#ifdef SIGTHAW
NUMNAME (THAW),
#endif
#ifdef SIGLOST
NUMNAME (LOST),
#endif
#ifdef SIGWINCH
NUMNAME (WINCH),
#endif
/* GNU/Linux 2.2. */
#ifdef SIGINFO
NUMNAME (INFO),
#endif
#ifdef SIGIO
NUMNAME (IO),
#endif
#ifdef SIGSTKFLT
NUMNAME (STKFLT),
#endif
/* AIX 7. */
#ifdef SIGCPUFAIL
NUMNAME (CPUFAIL),
#endif
/* AIX 5L. */
#ifdef SIGDANGER
NUMNAME (DANGER),
#endif
#ifdef SIGGRANT
NUMNAME (GRANT),
#endif
#ifdef SIGMIGRATE
NUMNAME (MIGRATE),
#endif
#ifdef SIGMSG
NUMNAME (MSG),
#endif
#ifdef SIGPRE
NUMNAME (PRE),
#endif
#ifdef SIGRETRACT
NUMNAME (RETRACT),
#endif
#ifdef SIGSAK
NUMNAME (SAK),
#endif
#ifdef SIGSOUND
NUMNAME (SOUND),
#endif
/* Older AIX versions. */
#ifdef SIGALRM1
NUMNAME (ALRM1), /* unknown; taken from Bash 2.05 */
#endif
#ifdef SIGKAP
NUMNAME (KAP), /* Older name for SIGGRANT. */
#endif
#ifdef SIGVIRT
NUMNAME (VIRT), /* unknown; taken from Bash 2.05 */
#endif
#ifdef SIGWINDOW
NUMNAME (WINDOW), /* Older name for SIGWINCH. */
#endif
/* OpenBSD. */
#ifdef SIGTHR
NUMNAME (THR),
#endif
/* BeOS, Haiku */
#ifdef SIGKILLTHR
NUMNAME (KILLTHR),
#endif
/* Older HP-UX versions. */
#ifdef SIGDIL
NUMNAME (DIL),
#endif
/* native Windows */
#ifdef SIGBREAK
NUMNAME (BREAK),
#endif
/* Korn shell and Bash, of uncertain vintage. */
{ 0, "EXIT" }
};
#define NUMNAME_ENTRIES (sizeof numname_table / sizeof numname_table[0])
/* ISDIGIT differs from isdigit, as follows:
- Its arg may be any int or unsigned int; it need not be an unsigned char
or EOF.
- It's typically faster.
POSIX says that only '0' through '9' are digits. Prefer ISDIGIT to
isdigit unless it's important to use the locale's definition
of "digit" even when the host does not conform to POSIX. */
#define ISDIGIT(c) ((unsigned int) (c) - '0' <= 9)
/* Convert the signal name SIGNAME to a signal number. Return the
signal number if successful, -1 otherwise. */
static int
str2signum (char const *signame)
{
if (ISDIGIT (*signame))
{
char *endp;
long int n = strtol (signame, &endp, 10);
if (! *endp && n <= SIGNUM_BOUND)
return n;
}
else
{
unsigned int i;
for (i = 0; i < NUMNAME_ENTRIES; i++)
if (strcmp (numname_table[i].name, signame) == 0)
return numname_table[i].num;
{
char *endp;
int rtmin = SIGRTMIN;
int rtmax = SIGRTMAX;
if (0 < rtmin && strncmp (signame, "RTMIN", 5) == 0)
{
long int n = strtol (signame + 5, &endp, 10);
if (! *endp && 0 <= n && n <= rtmax - rtmin)
return rtmin + n;
}
else if (0 < rtmax && strncmp (signame, "RTMAX", 5) == 0)
{
long int n = strtol (signame + 5, &endp, 10);
if (! *endp && rtmin - rtmax <= n && n <= 0)
return rtmax + n;
}
}
}
return -1;
}
/* Convert the signal name SIGNAME to the signal number *SIGNUM.
Return 0 if successful, -1 otherwise. */
int
str2sig (char const *signame, int *signum)
{
*signum = str2signum (signame);
return *signum < 0 ? -1 : 0;
}
/* Convert SIGNUM to a signal name in SIGNAME. SIGNAME must point to
a buffer of at least SIG2STR_MAX bytes. Return 0 if successful, -1
otherwise. */
int
sig2str (int signum, char *signame)
{
unsigned int i;
for (i = 0; i < NUMNAME_ENTRIES; i++)
if (numname_table[i].num == signum)
{
strcpy (signame, numname_table[i].name);
return 0;
}
{
int rtmin = SIGRTMIN;
int rtmax = SIGRTMAX;
int base, delta;
if (! (rtmin <= signum && signum <= rtmax))
return -1;
if (signum <= rtmin + (rtmax - rtmin) / 2)
{
strcpy (signame, "RTMIN");
base = rtmin;
}
else
{
strcpy (signame, "RTMAX");
base = rtmax;
}
delta = signum - base;
if (delta != 0)
sprintf (signame + 5, "%+d", delta);
return 0;
}
}
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