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strsignal.c
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1994-02-20
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/* Extended support for using signal values.
Copyright (C) 1992 Free Software Foundation, Inc.
Written by Fred Fish. fnf@cygnus.com
This file is part of the libiberty library.
Libiberty is free software; you can redistribute it and/or
modify it under the terms of the GNU Library General Public
License as published by the Free Software Foundation; either
version 2 of the License, or (at your option) any later version.
Libiberty 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with libiberty; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
#include "ansidecl.h"
#include "libiberty.h"
#include "config.h"
#ifdef LOSING_SYS_SIGLIST
#define sys_siglist no_such_symbol
#endif
#include <stdio.h>
#include <signal.h>
/* Routines imported from standard C runtime libraries. */
#ifdef __STDC__
#include <stddef.h>
extern void *malloc (size_t size); /* 4.10.3.3 */
extern void *memset (void *s, int c, size_t n); /* 4.11.6.1 */
#else /* !__STDC__ */
extern char *malloc (); /* Standard memory allocater */
extern char *memset ();
#endif /* __STDC__ */
#ifdef LOSING_SYS_SIGLIST
#undef sys_siglist
#endif
#ifndef NULL
# ifdef __STDC__
# define NULL (void *) 0
# else
# define NULL 0
# endif
#endif
#ifndef MAX
# define MAX(a,b) ((a) > (b) ? (a) : (b))
#endif
/* Translation table for signal values.
Note that this table is generally only accessed when it is used at runtime
to initialize signal name and message tables that are indexed by signal
value.
Not all of these signals will exist on all systems. This table is the only
thing that should have to be updated as new signal numbers are introduced.
It's sort of ugly, but at least its portable. */
struct signal_info
{
int value; /* The numeric value from <signal.h> */
const char *name; /* The equivalent symbolic value */
#ifdef NEED_sys_siglist
const char *msg; /* Short message about this value */
#endif
};
#ifdef NEED_sys_siglist
# define ENTRY(value, name, msg) {value, name, msg}
#else
# define ENTRY(value, name, msg) {value, name}
#endif
static const struct signal_info signal_table[] =
{
#if defined (SIGHUP)
ENTRY(SIGHUP, "SIGHUP", "Hangup"),
#endif
#if defined (SIGINT)
ENTRY(SIGINT, "SIGINT", "Interrupt"),
#endif
#if defined (SIGQUIT)
ENTRY(SIGQUIT, "SIGQUIT", "Quit"),
#endif
#if defined (SIGILL)
ENTRY(SIGILL, "SIGILL", "Illegal instruction"),
#endif
#if defined (SIGTRAP)
ENTRY(SIGTRAP, "SIGTRAP", "Trace/breakpoint trap"),
#endif
/* Put SIGIOT before SIGABRT, so that if SIGIOT==SIGABRT then SIGABRT
overrides SIGIOT. SIGABRT is in ANSI and POSIX.1, and SIGIOT isn't. */
#if defined (SIGIOT)
ENTRY(SIGIOT, "SIGIOT", "IOT trap"),
#endif
#if defined (SIGABRT)
ENTRY(SIGABRT, "SIGABRT", "Aborted"),
#endif
#if defined (SIGEMT)
ENTRY(SIGEMT, "SIGEMT", "Emulation trap"),
#endif
#if defined (SIGFPE)
ENTRY(SIGFPE, "SIGFPE", "Arithmetic exception"),
#endif
#if defined (SIGKILL)
ENTRY(SIGKILL, "SIGKILL", "Killed"),
#endif
#if defined (SIGBUS)
ENTRY(SIGBUS, "SIGBUS", "Bus error"),
#endif
#if defined (SIGSEGV)
ENTRY(SIGSEGV, "SIGSEGV", "Segmentation fault"),
#endif
#if defined (SIGSYS)
ENTRY(SIGSYS, "SIGSYS", "Bad system call"),
#endif
#if defined (SIGPIPE)
ENTRY(SIGPIPE, "SIGPIPE", "Broken pipe"),
#endif
#if defined (SIGALRM)
ENTRY(SIGALRM, "SIGALRM", "Alarm clock"),
#endif
#if defined (SIGTERM)
ENTRY(SIGTERM, "SIGTERM", "Terminated"),
#endif
#if defined (SIGUSR1)
ENTRY(SIGUSR1, "SIGUSR1", "User defined signal 1"),
#endif
#if defined (SIGUSR2)
ENTRY(SIGUSR2, "SIGUSR2", "User defined signal 2"),
#endif
/* Put SIGCLD before SIGCHLD, so that if SIGCLD==SIGCHLD then SIGCHLD
overrides SIGCLD. SIGCHLD is in POXIX.1 */
#if defined (SIGCLD)
ENTRY(SIGCLD, "SIGCLD", "Child status changed"),
#endif
#if defined (SIGCHLD)
ENTRY(SIGCHLD, "SIGCHLD", "Child status changed"),
#endif
#if defined (SIGPWR)
ENTRY(SIGPWR, "SIGPWR", "Power fail/restart"),
#endif
#if defined (SIGWINCH)
ENTRY(SIGWINCH, "SIGWINCH", "Window size changed"),
#endif
#if defined (SIGURG)
ENTRY(SIGURG, "SIGURG", "Urgent I/O condition"),
#endif
#if defined (SIGIO)
/* "I/O pending" has also been suggested, but is misleading since the
signal only happens when the process has asked for it, not everytime
I/O is pending. */
ENTRY(SIGIO, "SIGIO", "I/O possible"),
#endif
#if defined (SIGPOLL)
ENTRY(SIGPOLL, "SIGPOLL", "Pollable event occurred"),
#endif
#if defined (SIGSTOP)
ENTRY(SIGSTOP, "SIGSTOP", "Stopped (signal)"),
#endif
#if defined (SIGTSTP)
ENTRY(SIGTSTP, "SIGTSTP", "Stopped (user)"),
#endif
#if defined (SIGCONT)
ENTRY(SIGCONT, "SIGCONT", "Continued"),
#endif
#if defined (SIGTTIN)
ENTRY(SIGTTIN, "SIGTTIN", "Stopped (tty input)"),
#endif
#if defined (SIGTTOU)
ENTRY(SIGTTOU, "SIGTTOU", "Stopped (tty output)"),
#endif
#if defined (SIGVTALRM)
ENTRY(SIGVTALRM, "SIGVTALRM", "Virtual timer expired"),
#endif
#if defined (SIGPROF)
ENTRY(SIGPROF, "SIGPROF", "Profiling timer expired"),
#endif
#if defined (SIGXCPU)
ENTRY(SIGXCPU, "SIGXCPU", "CPU time limit exceeded"),
#endif
#if defined (SIGXFSZ)
ENTRY(SIGXFSZ, "SIGXFSZ", "File size limit exceeded"),
#endif
#if defined (SIGWIND)
ENTRY(SIGWIND, "SIGWIND", "SIGWIND"),
#endif
#if defined (SIGPHONE)
ENTRY(SIGPHONE, "SIGPHONE", "SIGPHONE"),
#endif
#if defined (SIGLOST)
ENTRY(SIGLOST, "SIGLOST", "Resource lost"),
#endif
#if defined (SIGWAITING)
ENTRY(SIGWAITING, "SIGWAITING", "Process's LWPs are blocked"),
#endif
#if defined (SIGLWP)
ENTRY(SIGLWP, "SIGLWP", "Signal LWP"),
#endif
#if defined (SIGDANGER)
ENTRY(SIGDANGER, "SIGDANGER", "Swap space dangerously low"),
#endif
#if defined (SIGGRANT)
ENTRY(SIGGRANT, "SIGGRANT", "Monitor mode granted"),
#endif
#if defined (SIGRETRACT)
ENTRY(SIGRETRACT, "SIGRETRACT", "Need to relinguish monitor mode"),
#endif
#if defined (SIGMSG)
ENTRY(SIGMSG, "SIGMSG", "Monitor mode data available"),
#endif
#if defined (SIGSOUND)
ENTRY(SIGSOUND, "SIGSOUND", "Sound completed"),
#endif
#if defined (SIGSAK)
ENTRY(SIGSAK, "SIGSAK", "Secure attention"),
#endif
ENTRY(0, NULL, NULL)
};
/* Translation table allocated and initialized at runtime. Indexed by the
signal value to find the equivalent symbolic value. */
static const char **signal_names;
static int num_signal_names = 0;
/* Translation table allocated and initialized at runtime, if it does not
already exist in the host environment. Indexed by the signal value to find
the descriptive string.
We don't export it for use in other modules because even though it has the
same name, it differs from other implementations in that it is dynamically
initialized rather than statically initialized. */
#ifdef NEED_sys_siglist
static int sys_nsig;
static const char **sys_siglist;
#else
static int sys_nsig = NSIG;
extern const char * const sys_siglist[];
#endif
/*
NAME
init_signal_tables -- initialize the name and message tables
SYNOPSIS
static void init_signal_tables ();
DESCRIPTION
Using the signal_table, which is initialized at compile time, generate
the signal_names and the sys_siglist (if needed) tables, which are
indexed at runtime by a specific signal value.
BUGS
The initialization of the tables may fail under low memory conditions,
in which case we don't do anything particularly useful, but we don't
bomb either. Who knows, it might succeed at a later point if we free
some memory in the meantime. In any case, the other routines know
how to deal with lack of a table after trying to initialize it. This
may or may not be considered to be a bug, that we don't specifically
warn about this particular failure mode.
*/
static void
init_signal_tables ()
{
const struct signal_info *eip;
int nbytes;
/* If we haven't already scanned the signal_table once to find the maximum
signal value, then go find it now. */