97d40d3d4a
us up to version 2.17.50.20070703, at the last GPLv2 commit. Amongst others, this added upstream support for some FreeBSD-specific things that we previously had to manually hack in, such as the OSABI label support, and so on. There are also quite a number of new files, some for cpu's (e.g. SPU) that we may or may not be interested in, but those can be cleaned up later on, if needed.
609 lines
15 KiB
C
609 lines
15 KiB
C
/* Extended support for using signal values.
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Written by Fred Fish. fnf@cygnus.com
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This file is in the public domain. */
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#include "config.h"
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#include "ansidecl.h"
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#include "libiberty.h"
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/* We need to declare sys_siglist, because even if the system provides
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it we can't assume that it is declared in <signal.h> (for example,
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SunOS provides sys_siglist, but it does not declare it in any
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header file). However, we can't declare sys_siglist portably,
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because on some systems it is declared with const and on some
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systems it is declared without const. If we were using autoconf,
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we could work out the right declaration. Until, then we just
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ignore any declaration in the system header files, and always
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declare it ourselves. With luck, this will always work. */
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#define sys_siglist no_such_symbol
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#define sys_nsig sys_nsig__no_such_symbol
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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 HAVE_STDLIB_H
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#include <stdlib.h>
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#else
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extern PTR malloc ();
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#endif
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#ifdef HAVE_STRING_H
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#include <string.h>
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#else
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extern PTR memset ();
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#endif
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/* Undefine the macro we used to hide the definition of sys_siglist
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found in the system header files. */
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#undef sys_siglist
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#undef sys_nsig
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#ifndef NULL
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# define NULL (void *) 0
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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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static void init_signal_tables (void);
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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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const int value; /* The numeric value from <signal.h> */
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const char *const name; /* The equivalent symbolic value */
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#ifndef HAVE_SYS_SIGLIST
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const char *const msg; /* Short message about this value */
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#endif
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};
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#ifndef HAVE_SYS_SIGLIST
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# define ENTRY(value, name, msg) {value, name, msg}
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#else
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# define ENTRY(value, name, msg) {value, name}
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#endif
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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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ENTRY(SIGHUP, "SIGHUP", "Hangup"),
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#endif
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#if defined (SIGINT)
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ENTRY(SIGINT, "SIGINT", "Interrupt"),
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#endif
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#if defined (SIGQUIT)
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ENTRY(SIGQUIT, "SIGQUIT", "Quit"),
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#endif
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#if defined (SIGILL)
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ENTRY(SIGILL, "SIGILL", "Illegal instruction"),
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#endif
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#if defined (SIGTRAP)
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ENTRY(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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ENTRY(SIGIOT, "SIGIOT", "IOT trap"),
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#endif
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#if defined (SIGABRT)
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ENTRY(SIGABRT, "SIGABRT", "Aborted"),
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#endif
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#if defined (SIGEMT)
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ENTRY(SIGEMT, "SIGEMT", "Emulation trap"),
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#endif
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#if defined (SIGFPE)
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ENTRY(SIGFPE, "SIGFPE", "Arithmetic exception"),
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#endif
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#if defined (SIGKILL)
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ENTRY(SIGKILL, "SIGKILL", "Killed"),
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#endif
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#if defined (SIGBUS)
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ENTRY(SIGBUS, "SIGBUS", "Bus error"),
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#endif
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#if defined (SIGSEGV)
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ENTRY(SIGSEGV, "SIGSEGV", "Segmentation fault"),
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#endif
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#if defined (SIGSYS)
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ENTRY(SIGSYS, "SIGSYS", "Bad system call"),
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#endif
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#if defined (SIGPIPE)
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ENTRY(SIGPIPE, "SIGPIPE", "Broken pipe"),
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#endif
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#if defined (SIGALRM)
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ENTRY(SIGALRM, "SIGALRM", "Alarm clock"),
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#endif
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#if defined (SIGTERM)
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ENTRY(SIGTERM, "SIGTERM", "Terminated"),
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#endif
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#if defined (SIGUSR1)
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ENTRY(SIGUSR1, "SIGUSR1", "User defined signal 1"),
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#endif
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#if defined (SIGUSR2)
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ENTRY(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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ENTRY(SIGCLD, "SIGCLD", "Child status changed"),
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#endif
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#if defined (SIGCHLD)
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ENTRY(SIGCHLD, "SIGCHLD", "Child status changed"),
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#endif
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#if defined (SIGPWR)
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ENTRY(SIGPWR, "SIGPWR", "Power fail/restart"),
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#endif
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#if defined (SIGWINCH)
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ENTRY(SIGWINCH, "SIGWINCH", "Window size changed"),
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#endif
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#if defined (SIGURG)
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ENTRY(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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ENTRY(SIGIO, "SIGIO", "I/O possible"),
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#endif
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#if defined (SIGPOLL)
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ENTRY(SIGPOLL, "SIGPOLL", "Pollable event occurred"),
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#endif
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#if defined (SIGSTOP)
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ENTRY(SIGSTOP, "SIGSTOP", "Stopped (signal)"),
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#endif
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#if defined (SIGTSTP)
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ENTRY(SIGTSTP, "SIGTSTP", "Stopped (user)"),
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#endif
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#if defined (SIGCONT)
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ENTRY(SIGCONT, "SIGCONT", "Continued"),
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#endif
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#if defined (SIGTTIN)
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ENTRY(SIGTTIN, "SIGTTIN", "Stopped (tty input)"),
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#endif
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#if defined (SIGTTOU)
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ENTRY(SIGTTOU, "SIGTTOU", "Stopped (tty output)"),
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#endif
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#if defined (SIGVTALRM)
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ENTRY(SIGVTALRM, "SIGVTALRM", "Virtual timer expired"),
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#endif
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#if defined (SIGPROF)
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ENTRY(SIGPROF, "SIGPROF", "Profiling timer expired"),
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#endif
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#if defined (SIGXCPU)
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ENTRY(SIGXCPU, "SIGXCPU", "CPU time limit exceeded"),
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#endif
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#if defined (SIGXFSZ)
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ENTRY(SIGXFSZ, "SIGXFSZ", "File size limit exceeded"),
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#endif
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#if defined (SIGWIND)
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ENTRY(SIGWIND, "SIGWIND", "SIGWIND"),
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#endif
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#if defined (SIGPHONE)
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ENTRY(SIGPHONE, "SIGPHONE", "SIGPHONE"),
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#endif
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#if defined (SIGLOST)
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ENTRY(SIGLOST, "SIGLOST", "Resource lost"),
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#endif
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#if defined (SIGWAITING)
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ENTRY(SIGWAITING, "SIGWAITING", "Process's LWPs are blocked"),
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#endif
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#if defined (SIGLWP)
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ENTRY(SIGLWP, "SIGLWP", "Signal LWP"),
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#endif
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#if defined (SIGDANGER)
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ENTRY(SIGDANGER, "SIGDANGER", "Swap space dangerously low"),
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#endif
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#if defined (SIGGRANT)
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ENTRY(SIGGRANT, "SIGGRANT", "Monitor mode granted"),
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#endif
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#if defined (SIGRETRACT)
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ENTRY(SIGRETRACT, "SIGRETRACT", "Need to relinguish monitor mode"),
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#endif
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#if defined (SIGMSG)
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ENTRY(SIGMSG, "SIGMSG", "Monitor mode data available"),
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#endif
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#if defined (SIGSOUND)
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ENTRY(SIGSOUND, "SIGSOUND", "Sound completed"),
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#endif
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#if defined (SIGSAK)
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ENTRY(SIGSAK, "SIGSAK", "Secure attention"),
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#endif
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ENTRY(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 const 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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#ifndef HAVE_SYS_SIGLIST
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static int sys_nsig;
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static const char **sys_siglist;
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#else
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#ifdef NSIG
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static int sys_nsig = NSIG;
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#else
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#ifdef _NSIG
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static int sys_nsig = _NSIG;
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#endif
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#endif
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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 (void)
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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 = (const 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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#ifndef HAVE_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 = (const 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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@deftypefn Extension int signo_max (void)
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Returns the maximum signal value for which a corresponding symbolic
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name or message is available. Note that in the case where we use the
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@code{sys_siglist} supplied by the system, it is possible for there to
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be more symbolic names than messages, or vice versa. In fact, the
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manual page for @code{psignal(3b)} explicitly warns that one should
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check the size of the table (@code{NSIG}) before indexing it, since
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new signal codes may be added to the system before they are added to
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the table. Thus @code{NSIG} might be smaller than value implied by
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the largest signo value defined in @code{<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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@end deftypefn
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*/
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int
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signo_max (void)
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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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@deftypefn Supplemental {const char *} strsignal (int @var{signo})
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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 @code{sys_siglist}, these strings will be the same as the
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ones used by @code{psignal()}.
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If the supplied signal number is within the valid range of indices for
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the @code{sys_siglist}, but no message is available for the particular
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signal number, then returns the string @samp{Signal @var{num}}, where
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@var{num} is the signal number.
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If the supplied signal number is not a valid index into
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@code{sys_siglist}, returns @code{NULL}.
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The returned string is only guaranteed to be valid only until the next
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call to @code{strsignal}.
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@end deftypefn
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*/
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#ifndef HAVE_STRSIGNAL
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const char *
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strsignal (int signo)
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{
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const char *msg;
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static char buf[32];
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#ifndef HAVE_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 = (const char *) 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 = (const char *) sys_siglist[signo];
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}
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return (msg);
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}
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#endif /* ! HAVE_STRSIGNAL */
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/*
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@deftypefn Extension {const char*} strsigno (int @var{signo})
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Given an signal number, returns a pointer to a string containing the
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symbolic name of that signal number, as found in @code{<signal.h>}.
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If the supplied signal number is within the valid range of indices for
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symbolic names, but no name is available for the particular signal
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number, then returns the string @samp{Signal @var{num}}, where
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@var{num} is 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 @code{NULL}.
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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 @code{strsigno}.
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@end deftypefn
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*/
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const char *
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strsigno (int signo)
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{
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const 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 = (const char *) 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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@deftypefn Extension int strtosigno (const char *@var{name})
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Given the symbolic name of a signal, map it to a signal number. If no
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translation is found, returns 0.
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@end deftypefn
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*/
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int
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strtosigno (const 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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@deftypefn Supplemental void psignal (int @var{signo}, char *@var{message})
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Print @var{message} to the standard error, followed by a colon,
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followed by the description of the signal specified by @var{signo},
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followed by a newline.
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@end deftypefn
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*/
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#ifndef HAVE_PSIGNAL
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void
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psignal (int signo, char *message)
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{
|
|
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 /* ! HAVE_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
|
|
|
|
#include <stdio.h>
|
|
|
|
int
|
|
main (void)
|
|
{
|
|
int signo;
|
|
int maxsigno;
|
|
const char *name;
|
|
const char *msg;
|
|
|
|
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);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#endif
|