624 lines
14 KiB
C
624 lines
14 KiB
C
/* Extended support for using signal values.
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Copyright (C) 1992 Free Software Foundation, Inc.
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Written by Fred Fish. fnf@cygnus.com
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This file is part of the libiberty library.
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Libiberty is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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Libiberty is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with libiberty; see the file COPYING.LIB. If
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not, write to the Free Software Foundation, Inc., 675 Mass Ave,
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Cambridge, MA 02139, USA. */
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#include "config.h"
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#include <stdio.h>
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#include <signal.h>
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/* Routines imported from standard C runtime libraries. */
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#ifdef __STDC__
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#include <stddef.h>
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extern void *malloc (size_t size); /* 4.10.3.3 */
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extern void *memset (void *s, int c, size_t n); /* 4.11.6.1 */
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#else /* !__STDC__ */
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#ifndef const
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#define const
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#endif
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extern char *malloc (); /* Standard memory allocater */
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extern char *memset ();
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#endif /* __STDC__ */
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#ifndef NULL
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# ifdef __STDC__
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# define NULL (void *) 0
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# else
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# define NULL 0
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# endif
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#endif
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#ifndef MAX
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# define MAX(a,b) ((a) > (b) ? (a) : (b))
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#endif
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/* Translation table for signal values.
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Note that this table is generally only accessed when it is used at runtime
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to initialize signal name and message tables that are indexed by signal
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value.
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Not all of these signals will exist on all systems. This table is the only
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thing that should have to be updated as new signal numbers are introduced.
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It's sort of ugly, but at least its portable. */
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struct signal_info
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{
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int value; /* The numeric value from <signal.h> */
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char *name; /* The equivalent symbolic value */
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char *msg; /* Short message about this value */
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};
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static const struct signal_info signal_table[] =
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{
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#if defined (SIGHUP)
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SIGHUP, "SIGHUP", "Hangup",
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#endif
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#if defined (SIGINT)
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SIGINT, "SIGINT", "Interrupt",
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#endif
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#if defined (SIGQUIT)
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SIGQUIT, "SIGQUIT", "Quit",
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#endif
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#if defined (SIGILL)
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SIGILL, "SIGILL", "Illegal instruction",
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#endif
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#if defined (SIGTRAP)
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SIGTRAP, "SIGTRAP", "Trace/breakpoint trap",
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#endif
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/* Put SIGIOT before SIGABRT, so that if SIGIOT==SIGABRT then SIGABRT
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overrides SIGIOT. SIGABRT is in ANSI and POSIX.1, and SIGIOT isn't. */
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#if defined (SIGIOT)
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SIGIOT, "SIGIOT", "IOT trap",
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#endif
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#if defined (SIGABRT)
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SIGABRT, "SIGABRT", "Aborted",
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#endif
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#if defined (SIGEMT)
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SIGEMT, "SIGEMT", "Emulation trap",
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#endif
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#if defined (SIGFPE)
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SIGFPE, "SIGFPE", "Arithmetic exception",
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#endif
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#if defined (SIGKILL)
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SIGKILL, "SIGKILL", "Killed",
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#endif
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#if defined (SIGBUS)
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SIGBUS, "SIGBUS", "Bus error",
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#endif
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#if defined (SIGSEGV)
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SIGSEGV, "SIGSEGV", "Segmentation fault",
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#endif
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#if defined (SIGSYS)
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SIGSYS, "SIGSYS", "Bad system call",
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#endif
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#if defined (SIGPIPE)
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SIGPIPE, "SIGPIPE", "Broken pipe",
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#endif
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#if defined (SIGALRM)
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SIGALRM, "SIGALRM", "Alarm clock",
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#endif
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#if defined (SIGTERM)
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SIGTERM, "SIGTERM", "Terminated",
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#endif
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#if defined (SIGUSR1)
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SIGUSR1, "SIGUSR1", "User defined signal 1",
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#endif
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#if defined (SIGUSR2)
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SIGUSR2, "SIGUSR2", "User defined signal 2",
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#endif
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/* Put SIGCLD before SIGCHLD, so that if SIGCLD==SIGCHLD then SIGCHLD
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overrides SIGCLD. SIGCHLD is in POXIX.1 */
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#if defined (SIGCLD)
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SIGCLD, "SIGCLD", "Child status changed",
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#endif
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#if defined (SIGCHLD)
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SIGCHLD, "SIGCHLD", "Child status changed",
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#endif
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#if defined (SIGPWR)
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SIGPWR, "SIGPWR", "Power fail/restart",
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#endif
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#if defined (SIGWINCH)
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SIGWINCH, "SIGWINCH", "Window size changed",
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#endif
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#if defined (SIGURG)
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SIGURG, "SIGURG", "Urgent I/O condition",
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#endif
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#if defined (SIGIO)
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/* "I/O pending has also been suggested, but is misleading since the
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signal only happens when the process has asked for it, not everytime
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I/O is pending. */
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SIGIO, "SIGIO", "I/O possible",
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#endif
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#if defined (SIGPOLL)
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SIGPOLL, "SIGPOLL", "Pollable event occurred",
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#endif
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#if defined (SIGSTOP)
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SIGSTOP, "SIGSTOP", "Stopped (signal)",
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#endif
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#if defined (SIGTSTP)
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SIGTSTP, "SIGTSTP", "Stopped (user)",
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#endif
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#if defined (SIGCONT)
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SIGCONT, "SIGCONT", "Continued",
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#endif
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#if defined (SIGTTIN)
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SIGTTIN, "SIGTTIN", "Stopped (tty input)",
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#endif
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#if defined (SIGTTOU)
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SIGTTOU, "SIGTTOU", "Stopped (tty output)",
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#endif
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#if defined (SIGVTALRM)
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SIGVTALRM, "SIGVTALRM", "Virtual timer expired",
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#endif
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#if defined (SIGPROF)
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SIGPROF, "SIGPROF", "Profiling timer expired",
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#endif
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#if defined (SIGXCPU)
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SIGXCPU, "SIGXCPU", "CPU time limit exceeded",
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#endif
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#if defined (SIGXFSZ)
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SIGXFSZ, "SIGXFSZ", "File size limit exceeded",
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#endif
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#if defined (SIGWIND)
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SIGWIND, "SIGWIND", "SIGWIND",
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#endif
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#if defined (SIGPHONE)
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SIGPHONE, "SIGPHONE", "SIGPHONE",
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#endif
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#if defined (SIGLOST)
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SIGLOST, "SIGLOST", "Resource lost",
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#endif
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#if defined (SIGWAITING)
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SIGWAITING, "SIGWAITING", "Process's LWPs are blocked",
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#endif
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#if defined (SIGLWP)
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SIGLWP, "SIGLWP", "Signal LWP",
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#endif
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#if defined (SIGDANGER)
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SIGDANGER, "SIGDANGER", "Swap space dangerously low",
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#endif
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#if defined (SIGGRANT)
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SIGGRANT, "SIGGRANT", "Monitor mode granted",
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#endif
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#if defined (SIGRETRACT)
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SIGRETRACT, "SIGRETRACT", "Need to relinguish monitor mode",
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#endif
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#if defined (SIGMSG)
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SIGMSG, "SIGMSG", "Monitor mode data available",
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#endif
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#if defined (SIGSOUND)
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SIGSOUND, "SIGSOUND", "Sound completed",
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#endif
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#if defined (SIGSAK)
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SIGSAK, "SIGSAK", "Secure attention",
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#endif
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0, NULL, NULL
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};
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/* Translation table allocated and initialized at runtime. Indexed by the
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signal value to find the equivalent symbolic value. */
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static char **signal_names;
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static int num_signal_names = 0;
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/* Translation table allocated and initialized at runtime, if it does not
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already exist in the host environment. Indexed by the signal value to find
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the descriptive string.
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We don't export it for use in other modules because even though it has the
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same name, it differs from other implementations in that it is dynamically
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initialized rather than statically initialized. */
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#ifdef NEED_sys_siglist
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static int sys_nsig;
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static char **sys_siglist;
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#else
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static int sys_nsig = NSIG;
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extern const char * const sys_siglist[];
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#endif
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/*
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NAME
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init_signal_tables -- initialize the name and message tables
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SYNOPSIS
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static void init_signal_tables ();
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DESCRIPTION
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Using the signal_table, which is initialized at compile time, generate
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the signal_names and the sys_siglist (if needed) tables, which are
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indexed at runtime by a specific signal value.
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BUGS
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The initialization of the tables may fail under low memory conditions,
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in which case we don't do anything particularly useful, but we don't
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bomb either. Who knows, it might succeed at a later point if we free
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some memory in the meantime. In any case, the other routines know
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how to deal with lack of a table after trying to initialize it. This
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may or may not be considered to be a bug, that we don't specifically
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warn about this particular failure mode.
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*/
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static void
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init_signal_tables ()
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{
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const struct signal_info *eip;
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int nbytes;
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/* If we haven't already scanned the signal_table once to find the maximum
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signal value, then go find it now. */
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if (num_signal_names == 0)
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{
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for (eip = signal_table; eip -> name != NULL; eip++)
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{
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if (eip -> value >= num_signal_names)
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{
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num_signal_names = eip -> value + 1;
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}
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}
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}
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/* Now attempt to allocate the signal_names table, zero it out, and then
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initialize it from the statically initialized signal_table. */
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if (signal_names == NULL)
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{
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nbytes = num_signal_names * sizeof (char *);
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if ((signal_names = (char **) malloc (nbytes)) != NULL)
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{
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memset (signal_names, 0, nbytes);
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for (eip = signal_table; eip -> name != NULL; eip++)
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{
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signal_names[eip -> value] = eip -> name;
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}
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}
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}
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#ifdef NEED_sys_siglist
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/* Now attempt to allocate the sys_siglist table, zero it out, and then
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initialize it from the statically initialized signal_table. */
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if (sys_siglist == NULL)
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{
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nbytes = num_signal_names * sizeof (char *);
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if ((sys_siglist = (char **) malloc (nbytes)) != NULL)
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{
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memset (sys_siglist, 0, nbytes);
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sys_nsig = num_signal_names;
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for (eip = signal_table; eip -> name != NULL; eip++)
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{
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sys_siglist[eip -> value] = eip -> msg;
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}
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}
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}
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#endif
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}
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/*
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NAME
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signo_max -- return the max signo value
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SYNOPSIS
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int signo_max ();
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DESCRIPTION
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Returns the maximum signo value for which a corresponding symbolic
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name or message is available. Note that in the case where
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we use the sys_siglist supplied by the system, it is possible for
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there to be more symbolic names than messages, or vice versa.
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In fact, the manual page for psignal(3b) explicitly warns that one
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should check the size of the table (NSIG) before indexing it,
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since new signal codes may be added to the system before they are
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added to the table. Thus NSIG might be smaller than value
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implied by the largest signo value defined in <signal.h>.
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We return the maximum value that can be used to obtain a meaningful
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symbolic name or message.
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*/
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int
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signo_max ()
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{
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int maxsize;
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if (signal_names == NULL)
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{
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init_signal_tables ();
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}
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maxsize = MAX (sys_nsig, num_signal_names);
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return (maxsize - 1);
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}
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/*
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NAME
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strsignal -- map a signal number to a signal message string
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SYNOPSIS
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char *strsignal (int signo)
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DESCRIPTION
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Maps an signal number to an signal message string, the contents of
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which are implementation defined. On systems which have the external
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variable sys_siglist, these strings will be the same as the ones used
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by psignal().
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If the supplied signal number is within the valid range of indices
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for the sys_siglist, but no message is available for the particular
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signal number, then returns the string "Signal NUM", where NUM is the
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signal number.
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If the supplied signal number is not a valid index into sys_siglist,
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returns NULL.
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The returned string is only guaranteed to be valid only until the
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next call to strsignal.
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*/
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char *
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strsignal (signo)
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int signo;
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{
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char *msg;
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static char buf[32];
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#ifdef NEED_sys_siglist
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if (signal_names == NULL)
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{
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init_signal_tables ();
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}
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#endif
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if ((signo < 0) || (signo >= sys_nsig))
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{
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/* Out of range, just return NULL */
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msg = NULL;
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}
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else if ((sys_siglist == NULL) || (sys_siglist[signo] == NULL))
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{
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/* In range, but no sys_siglist or no entry at this index. */
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sprintf (buf, "Signal %d", signo);
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msg = buf;
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}
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else
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{
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/* In range, and a valid message. Just return the message. */
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msg = (char*)sys_siglist[signo];
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}
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return (msg);
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}
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/*
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NAME
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strsigno -- map an signal number to a symbolic name string
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SYNOPSIS
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char *strsigno (int signo)
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DESCRIPTION
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Given an signal number, returns a pointer to a string containing
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the symbolic name of that signal number, as found in <signal.h>.
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If the supplied signal number is within the valid range of indices
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for symbolic names, but no name is available for the particular
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signal number, then returns the string "Signal NUM", where NUM is
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the signal number.
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If the supplied signal number is not within the range of valid
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indices, then returns NULL.
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BUGS
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The contents of the location pointed to are only guaranteed to be
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valid until the next call to strsigno.
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*/
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char *
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strsigno (signo)
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int signo;
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{
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char *name;
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static char buf[32];
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if (signal_names == NULL)
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{
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init_signal_tables ();
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}
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if ((signo < 0) || (signo >= num_signal_names))
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{
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/* Out of range, just return NULL */
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name = NULL;
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}
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else if ((signal_names == NULL) || (signal_names[signo] == NULL))
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{
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/* In range, but no signal_names or no entry at this index. */
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sprintf (buf, "Signal %d", signo);
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name = buf;
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}
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else
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{
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/* In range, and a valid name. Just return the name. */
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name = signal_names[signo];
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}
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return (name);
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}
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/*
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NAME
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strtosigno -- map a symbolic signal name to a numeric value
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SYNOPSIS
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int strtosigno (char *name)
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DESCRIPTION
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Given the symbolic name of a signal, map it to a signal number.
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If no translation is found, returns 0.
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*/
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int
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strtosigno (name)
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char *name;
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{
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int signo = 0;
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if (name != NULL)
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{
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if (signal_names == NULL)
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{
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init_signal_tables ();
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}
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for (signo = 0; signo < num_signal_names; signo++)
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{
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if ((signal_names[signo] != NULL) &&
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(strcmp (name, signal_names[signo]) == 0))
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{
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break;
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}
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}
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if (signo == num_signal_names)
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{
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signo = 0;
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}
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}
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return (signo);
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}
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/*
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NAME
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psignal -- print message about signal to stderr
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SYNOPSIS
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void psignal (unsigned signo, char *message);
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DESCRIPTION
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Print to the standard error the message, followed by a colon,
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followed by the description of the signal specified by signo,
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followed by a newline.
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*/
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#ifdef NEED_psignal
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void
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psignal (signo, message)
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unsigned signo;
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char *message;
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{
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if (signal_names == NULL)
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{
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init_signal_tables ();
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}
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if ((signo <= 0) || (signo >= sys_nsig))
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{
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fprintf (stderr, "%s: unknown signal\n", message);
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}
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else
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{
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fprintf (stderr, "%s: %s\n", message, sys_siglist[signo]);
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}
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}
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#endif /* NEED_psignal */
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/* A simple little main that does nothing but print all the signal translations
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if MAIN is defined and this file is compiled and linked. */
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#ifdef MAIN
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main ()
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{
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int signo;
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int maxsigno;
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char *name;
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char *msg;
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char *strsigno ();
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char *strsignal ();
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maxsigno = signo_max ();
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printf ("%d entries in names table.\n", num_signal_names);
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printf ("%d entries in messages table.\n", sys_nsig);
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printf ("%d is max useful index.\n", maxsigno);
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/* Keep printing values until we get to the end of *both* tables, not
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*either* table. Note that knowing the maximum useful index does *not*
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relieve us of the responsibility of testing the return pointer for
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NULL. */
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for (signo = 0; signo <= maxsigno; signo++)
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{
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name = strsigno (signo);
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name = (name == NULL) ? "<NULL>" : name;
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msg = strsignal (signo);
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msg = (msg == NULL) ? "<NULL>" : msg;
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printf ("%-4d%-18s%s\n", signo, name, msg);
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}
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}
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#endif
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