home *** CD-ROM | disk | FTP | other *** search
- /* 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 "config.h"
-
- #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__ */
- #ifndef const
- #define const
- #endif
- extern char *malloc (); /* Standard memory allocater */
- extern char *memset ();
- #endif /* __STDC__ */
-
- #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> */
- char *name; /* The equivalent symbolic value */
- char *msg; /* Short message about this value */
- };
-
- static const struct signal_info signal_table[] =
- {
- #if defined (SIGHUP)
- SIGHUP, "SIGHUP", "Hangup",
- #endif
- #if defined (SIGINT)
- SIGINT, "SIGINT", "Interrupt",
- #endif
- #if defined (SIGQUIT)
- SIGQUIT, "SIGQUIT", "Quit",
- #endif
- #if defined (SIGILL)
- SIGILL, "SIGILL", "Illegal instruction",
- #endif
- #if defined (SIGTRAP)
- 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)
- SIGIOT, "SIGIOT", "IOT trap",
- #endif
- #if defined (SIGABRT)
- SIGABRT, "SIGABRT", "Aborted",
- #endif
- #if defined (SIGEMT)
- SIGEMT, "SIGEMT", "Emulation trap",
- #endif
- #if defined (SIGFPE)
- SIGFPE, "SIGFPE", "Arithmetic exception",
- #endif
- #if defined (SIGKILL)
- SIGKILL, "SIGKILL", "Killed",
- #endif
- #if defined (SIGBUS)
- SIGBUS, "SIGBUS", "Bus error",
- #endif
- #if defined (SIGSEGV)
- SIGSEGV, "SIGSEGV", "Segmentation fault",
- #endif
- #if defined (SIGSYS)
- SIGSYS, "SIGSYS", "Bad system call",
- #endif
- #if defined (SIGPIPE)
- SIGPIPE, "SIGPIPE", "Broken pipe",
- #endif
- #if defined (SIGALRM)
- SIGALRM, "SIGALRM", "Alarm clock",
- #endif
- #if defined (SIGTERM)
- SIGTERM, "SIGTERM", "Terminated",
- #endif
- #if defined (SIGUSR1)
- SIGUSR1, "SIGUSR1", "User defined signal 1",
- #endif
- #if defined (SIGUSR2)
- 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)
- SIGCLD, "SIGCLD", "Child status changed",
- #endif
- #if defined (SIGCHLD)
- SIGCHLD, "SIGCHLD", "Child status changed",
- #endif
- #if defined (SIGPWR)
- SIGPWR, "SIGPWR", "Power fail/restart",
- #endif
- #if defined (SIGWINCH)
- SIGWINCH, "SIGWINCH", "Window size changed",
- #endif
- #if defined (SIGURG)
- 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. */
- SIGIO, "SIGIO", "I/O possible",
- #endif
- #if defined (SIGPOLL)
- SIGPOLL, "SIGPOLL", "Pollable event occurred",
- #endif
- #if defined (SIGSTOP)
- SIGSTOP, "SIGSTOP", "Stopped (signal)",
- #endif
- #if defined (SIGTSTP)
- SIGTSTP, "SIGTSTP", "Stopped (user)",
- #endif
- #if defined (SIGCONT)
- SIGCONT, "SIGCONT", "Continued",
- #endif
- #if defined (SIGTTIN)
- SIGTTIN, "SIGTTIN", "Stopped (tty input)",
- #endif
- #if defined (SIGTTOU)
- SIGTTOU, "SIGTTOU", "Stopped (tty output)",
- #endif
- #if defined (SIGVTALRM)
- SIGVTALRM, "SIGVTALRM", "Virtual timer expired",
- #endif
- #if defined (SIGPROF)
- SIGPROF, "SIGPROF", "Profiling timer expired",
- #endif
- #if defined (SIGXCPU)
- SIGXCPU, "SIGXCPU", "CPU time limit exceeded",
- #endif
- #if defined (SIGXFSZ)
- SIGXFSZ, "SIGXFSZ", "File size limit exceeded",
- #endif
- #if defined (SIGWIND)
- SIGWIND, "SIGWIND", "SIGWIND",
- #endif
- #if defined (SIGPHONE)
- SIGPHONE, "SIGPHONE", "SIGPHONE",
- #endif
- #if defined (SIGLOST)
- SIGLOST, "SIGLOST", "Resource lost",
- #endif
- #if defined (SIGWAITING)
- SIGWAITING, "SIGWAITING", "Process's LWPs are blocked",
- #endif
- #if defined (SIGLWP)
- SIGLWP, "SIGLWP", "Signal LWP",
- #endif
- #if defined (SIGDANGER)
- SIGDANGER, "SIGDANGER", "Swap space dangerously low",
- #endif
- #if defined (SIGGRANT)
- SIGGRANT, "SIGGRANT", "Monitor mode granted",
- #endif
- #if defined (SIGRETRACT)
- SIGRETRACT, "SIGRETRACT", "Need to relinguish monitor mode",
- #endif
- #if defined (SIGMSG)
- SIGMSG, "SIGMSG", "Monitor mode data available",
- #endif
- #if defined (SIGSOUND)
- SIGSOUND, "SIGSOUND", "Sound completed",
- #endif
- #if defined (SIGSAK)
- SIGSAK, "SIGSAK", "Secure attention",
- #endif
- 0, NULL, NULL
- };
-
- /* Translation table allocated and initialized at runtime. Indexed by the
- signal value to find the equivalent symbolic value. */
-
- static 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 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. */
-
- if (num_signal_names == 0)
- {
- for (eip = signal_table; eip -> name != NULL; eip++)
- {
- if (eip -> value >= num_signal_names)
- {
- num_signal_names = eip -> value + 1;
- }
- }
- }
-
- /* Now attempt to allocate the signal_names table, zero it out, and then
- initialize it from the statically initialized signal_table. */
-
- if (signal_names == NULL)
- {
- nbytes = num_signal_names * sizeof (char *);
- if ((signal_names = (char **) malloc (nbytes)) != NULL)
- {
- memset (signal_names, 0, nbytes);
- for (eip = signal_table; eip -> name != NULL; eip++)
- {
- signal_names[eip -> value] = eip -> name;
- }
- }
- }
-
- #ifdef NEED_sys_siglist
-
- /* Now attempt to allocate the sys_siglist table, zero it out, and then
- initialize it from the statically initialized signal_table. */
-
- if (sys_siglist == NULL)
- {
- nbytes = num_signal_names * sizeof (char *);
- if ((sys_siglist = (char **) malloc (nbytes)) != NULL)
- {
- memset (sys_siglist, 0, nbytes);
- sys_nsig = num_signal_names;
- for (eip = signal_table; eip -> name != NULL; eip++)
- {
- sys_siglist[eip -> value] = eip -> msg;
- }
- }
- }
-
- #endif
-
- }
-
-
- /*
-
- NAME
-
- signo_max -- return the max signo value
-
- SYNOPSIS
-
- int signo_max ();
-
- DESCRIPTION
-
- Returns the maximum signo value for which a corresponding symbolic
- name or message is available. Note that in the case where
- we use the sys_siglist supplied by the system, it is possible for
- there to be more symbolic names than messages, or vice versa.
- In fact, the manual page for psignal(3b) explicitly warns that one
- should check the size of the table (NSIG) before indexing it,
- since new signal codes may be added to the system before they are
- added to the table. Thus NSIG might be smaller than value
- implied by the largest signo value defined in <signal.h>.
-
- We return the maximum value that can be used to obtain a meaningful
- symbolic name or message.
-
- */
-
- int
- signo_max ()
- {
- int maxsize;
-
- if (signal_names == NULL)
- {
- init_signal_tables ();
- }
- maxsize = MAX (sys_nsig, num_signal_names);
- return (maxsize - 1);
- }
-
-
- /*
-
- NAME
-
- strsignal -- map a signal number to a signal message string
-
- SYNOPSIS
-
- char *strsignal (int signo)
-
- DESCRIPTION
-
- Maps an signal number to an signal message string, the contents of
- which are implementation defined. On systems which have the external
- variable sys_siglist, these strings will be the same as the ones used
- by psignal().
-
- If the supplied signal number is within the valid range of indices
- for the sys_siglist, but no message is available for the particular
- signal number, then returns the string "Signal NUM", where NUM is the
- signal number.
-
- If the supplied signal number is not a valid index into sys_siglist,
- returns NULL.
-
- The returned string is only guaranteed to be valid only until the
- next call to strsignal.
-
- */
-
- char *
- strsignal (signo)
- int signo;
- {
- char *msg;
- static char buf[32];
-
- #ifdef NEED_sys_siglist
-
- if (signal_names == NULL)
- {
- init_signal_tables ();
- }
-
- #endif
-
- if ((signo < 0) || (signo >= sys_nsig))
- {
- /* Out of range, just return NULL */
- msg = NULL;
- }
- else if ((sys_siglist == NULL) || (sys_siglist[signo] == NULL))
- {
- /* In range, but no sys_siglist or no entry at this index. */
- sprintf (buf, "Signal %d", signo);
- msg = buf;
- }
- else
- {
- /* In range, and a valid message. Just return the message. */
- msg = (char*)sys_siglist[signo];
- }
-
- return (msg);
- }
-
-
- /*
-
- NAME
-
- strsigno -- map an signal number to a symbolic name string
-
- SYNOPSIS
-
- char *strsigno (int signo)
-
- DESCRIPTION
-
- Given an signal number, returns a pointer to a string containing
- the symbolic name of that signal number, as found in <signal.h>.
-
- If the supplied signal number is within the valid range of indices
- for symbolic names, but no name is available for the particular
- signal number, then returns the string "Signal NUM", where NUM is
- the signal number.
-
- If the supplied signal number is not within the range of valid
- indices, then returns NULL.
-
- BUGS
-
- The contents of the location pointed to are only guaranteed to be
- valid until the next call to strsigno.
-
- */
-
- char *
- strsigno (signo)
- int signo;
- {
- char *name;
- static char buf[32];
-
- if (signal_names == NULL)
- {
- init_signal_tables ();
- }
-
- if ((signo < 0) || (signo >= num_signal_names))
- {
- /* Out of range, just return NULL */
- name = NULL;
- }
- else if ((signal_names == NULL) || (signal_names[signo] == NULL))
- {
- /* In range, but no signal_names or no entry at this index. */
- sprintf (buf, "Signal %d", signo);
- name = buf;
- }
- else
- {
- /* In range, and a valid name. Just return the name. */
- name = signal_names[signo];
- }
-
- return (name);
- }
-
-
- /*
-
- NAME
-
- strtosigno -- map a symbolic signal name to a numeric value
-
- SYNOPSIS
-
- int strtosigno (char *name)
-
- DESCRIPTION
-
- Given the symbolic name of a signal, map it to a signal number.
- If no translation is found, returns 0.
-
- */
-
- int
- strtosigno (name)
- char *name;
- {
- int signo = 0;
-
- if (name != NULL)
- {
- if (signal_names == NULL)
- {
- init_signal_tables ();
- }
- for (signo = 0; signo < num_signal_names; signo++)
- {
- if ((signal_names[signo] != NULL) &&
- (strcmp (name, signal_names[signo]) == 0))
- {
- break;
- }
- }
- if (signo == num_signal_names)
- {
- signo = 0;
- }
- }
- return (signo);
- }
-
-
- /*
-
- NAME
-
- psignal -- print message about signal to stderr
-
- SYNOPSIS
-
- void psignal (unsigned signo, char *message);
-
- DESCRIPTION
-
- Print to the standard error the message, followed by a colon,
- followed by the description of the signal specified by signo,
- followed by a newline.
- */
-
- #ifdef NEED_psignal
-
- void
- psignal (signo, message)
- unsigned signo;
- char *message;
- {
- if (signal_names == NULL)
- {
- init_signal_tables ();
- }
- if ((signo <= 0) || (signo >= sys_nsig))
- {
- fprintf (stderr, "%s: unknown signal\n", message);
- }
- else
- {
- fprintf (stderr, "%s: %s\n", message, sys_siglist[signo]);
- }
- }
-
- #endif /* NEED_psignal */
-
-
- /* A simple little main that does nothing but print all the signal translations
- if MAIN is defined and this file is compiled and linked. */
-
- #ifdef MAIN
-
- main ()
- {
- int signo;
- int maxsigno;
- char *name;
- char *msg;
- char *strsigno ();
- char *strsignal ();
-
- maxsigno = signo_max ();
- printf ("%d entries in names table.\n", num_signal_names);
- printf ("%d entries in messages table.\n", sys_nsig);
- printf ("%d is max useful index.\n", maxsigno);
-
- /* Keep printing values until we get to the end of *both* tables, not
- *either* table. Note that knowing the maximum useful index does *not*
- relieve us of the responsibility of testing the return pointer for
- NULL. */
-
- for (signo = 0; signo <= maxsigno; signo++)
- {
- name = strsigno (signo);
- name = (name == NULL) ? "<NULL>" : name;
- msg = strsignal (signo);
- msg = (msg == NULL) ? "<NULL>" : msg;
- printf ("%-4d%-18s%s\n", signo, name, msg);
- }
- }
-
- #endif
-