| 1 | /* Extended support for using signal values.
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| 2 | Written by Fred Fish. [email protected]
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| 3 | This file is in the public domain. */
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| 4 |
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| 5 | #include "ansidecl.h"
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| 6 | #include "libiberty.h"
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| 7 |
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| 8 | #include "config.h"
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| 9 |
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| 10 | /* We need to declare sys_siglist, because even if the system provides
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| 11 | it we can't assume that it is declared in <signal.h> (for example,
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| 12 | SunOS provides sys_siglist, but it does not declare it in any
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| 13 | header file). fHowever, we can't declare sys_siglist portably,
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| 14 | because on some systems it is declared with const and on some
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| 15 | systems it is declared without const. If we were using autoconf,
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| 16 | we could work out the right declaration. Until, then we just
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| 17 | ignore any declaration in the system header files, and always
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| 18 | declare it ourselves. With luck, this will always work. */
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| 19 | #define sys_siglist no_such_symbol
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| 20 | #define sys_nsig sys_nsig__no_such_symbol
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| 21 |
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| 22 | #include <stdio.h>
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| 23 | #include <signal.h>
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| 24 |
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| 25 | /* Routines imported from standard C runtime libraries. */
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| 26 |
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| 27 | #ifdef HAVE_STDLIB_H
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| 28 | #include <stdlib.h>
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| 29 | #else
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| 30 | extern PTR malloc ();
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| 31 | #endif
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| 32 |
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| 33 | #ifdef HAVE_STRING_H
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| 34 | #include <string.h>
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| 35 | #else
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| 36 | extern PTR memset ();
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| 37 | #endif
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| 38 |
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| 39 | /* Undefine the macro we used to hide the definition of sys_siglist
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| 40 | found in the system header files. */
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| 41 | #undef sys_siglist
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| 42 | #undef sys_nsig
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| 43 |
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| 44 | #ifndef NULL
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| 45 | # ifdef __STDC__
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| 46 | # define NULL (void *) 0
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| 47 | # else
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| 48 | # define NULL 0
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| 49 | # endif
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| 50 | #endif
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| 51 |
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| 52 | #ifndef MAX
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| 53 | # define MAX(a,b) ((a) > (b) ? (a) : (b))
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| 54 | #endif
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| 55 |
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| 56 | static void init_signal_tables PARAMS ((void));
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| 57 |
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| 58 | /* Translation table for signal values.
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| 59 |
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| 60 | Note that this table is generally only accessed when it is used at runtime
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| 61 | to initialize signal name and message tables that are indexed by signal
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| 62 | value.
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| 63 |
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| 64 | Not all of these signals will exist on all systems. This table is the only
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| 65 | thing that should have to be updated as new signal numbers are introduced.
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| 66 | It's sort of ugly, but at least its portable. */
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| 67 |
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| 68 | struct signal_info
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| 69 | {
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| 70 | const int value; /* The numeric value from <signal.h> */
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| 71 | const char *const name; /* The equivalent symbolic value */
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| 72 | #ifndef HAVE_SYS_SIGLIST
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| 73 | const char *const msg; /* Short message about this value */
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| 74 | #endif
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| 75 | };
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| 76 |
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| 77 | #ifndef HAVE_SYS_SIGLIST
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| 78 | # define ENTRY(value, name, msg) {value, name, msg}
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| 79 | #else
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| 80 | # define ENTRY(value, name, msg) {value, name}
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| 81 | #endif
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| 82 |
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| 83 | static const struct signal_info signal_table[] =
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| 84 | {
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| 85 | #if defined (SIGHUP)
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| 86 | ENTRY(SIGHUP, "SIGHUP", "Hangup"),
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| 87 | #endif
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| 88 | #if defined (SIGINT)
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| 89 | ENTRY(SIGINT, "SIGINT", "Interrupt"),
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| 90 | #endif
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| 91 | #if defined (SIGQUIT)
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| 92 | ENTRY(SIGQUIT, "SIGQUIT", "Quit"),
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| 93 | #endif
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| 94 | #if defined (SIGILL)
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| 95 | ENTRY(SIGILL, "SIGILL", "Illegal instruction"),
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| 96 | #endif
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| 97 | #if defined (SIGTRAP)
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| 98 | ENTRY(SIGTRAP, "SIGTRAP", "Trace/breakpoint trap"),
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| 99 | #endif
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| 100 | /* Put SIGIOT before SIGABRT, so that if SIGIOT==SIGABRT then SIGABRT
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| 101 | overrides SIGIOT. SIGABRT is in ANSI and POSIX.1, and SIGIOT isn't. */
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| 102 | #if defined (SIGIOT)
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| 103 | ENTRY(SIGIOT, "SIGIOT", "IOT trap"),
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| 104 | #endif
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| 105 | #if defined (SIGABRT)
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| 106 | ENTRY(SIGABRT, "SIGABRT", "Aborted"),
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| 107 | #endif
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| 108 | #if defined (SIGEMT)
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| 109 | ENTRY(SIGEMT, "SIGEMT", "Emulation trap"),
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| 110 | #endif
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| 111 | #if defined (SIGFPE)
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| 112 | ENTRY(SIGFPE, "SIGFPE", "Arithmetic exception"),
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| 113 | #endif
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| 114 | #if defined (SIGKILL)
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| 115 | ENTRY(SIGKILL, "SIGKILL", "Killed"),
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| 116 | #endif
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| 117 | #if defined (SIGBUS)
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| 118 | ENTRY(SIGBUS, "SIGBUS", "Bus error"),
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| 119 | #endif
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| 120 | #if defined (SIGSEGV)
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| 121 | ENTRY(SIGSEGV, "SIGSEGV", "Segmentation fault"),
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| 122 | #endif
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| 123 | #if defined (SIGSYS)
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| 124 | ENTRY(SIGSYS, "SIGSYS", "Bad system call"),
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| 125 | #endif
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| 126 | #if defined (SIGPIPE)
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| 127 | ENTRY(SIGPIPE, "SIGPIPE", "Broken pipe"),
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| 128 | #endif
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| 129 | #if defined (SIGALRM)
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| 130 | ENTRY(SIGALRM, "SIGALRM", "Alarm clock"),
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| 131 | #endif
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| 132 | #if defined (SIGTERM)
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| 133 | ENTRY(SIGTERM, "SIGTERM", "Terminated"),
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| 134 | #endif
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| 135 | #if defined (SIGUSR1)
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| 136 | ENTRY(SIGUSR1, "SIGUSR1", "User defined signal 1"),
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| 137 | #endif
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| 138 | #if defined (SIGUSR2)
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| 139 | ENTRY(SIGUSR2, "SIGUSR2", "User defined signal 2"),
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| 140 | #endif
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| 141 | /* Put SIGCLD before SIGCHLD, so that if SIGCLD==SIGCHLD then SIGCHLD
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| 142 | overrides SIGCLD. SIGCHLD is in POXIX.1 */
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| 143 | #if defined (SIGCLD)
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| 144 | ENTRY(SIGCLD, "SIGCLD", "Child status changed"),
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| 145 | #endif
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| 146 | #if defined (SIGCHLD)
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| 147 | ENTRY(SIGCHLD, "SIGCHLD", "Child status changed"),
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| 148 | #endif
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| 149 | #if defined (SIGPWR)
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| 150 | ENTRY(SIGPWR, "SIGPWR", "Power fail/restart"),
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| 151 | #endif
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| 152 | #if defined (SIGWINCH)
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| 153 | ENTRY(SIGWINCH, "SIGWINCH", "Window size changed"),
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| 154 | #endif
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| 155 | #if defined (SIGURG)
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| 156 | ENTRY(SIGURG, "SIGURG", "Urgent I/O condition"),
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| 157 | #endif
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| 158 | #if defined (SIGIO)
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| 159 | /* "I/O pending" has also been suggested, but is misleading since the
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| 160 | signal only happens when the process has asked for it, not everytime
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| 161 | I/O is pending. */
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| 162 | ENTRY(SIGIO, "SIGIO", "I/O possible"),
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| 163 | #endif
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| 164 | #if defined (SIGPOLL)
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| 165 | ENTRY(SIGPOLL, "SIGPOLL", "Pollable event occurred"),
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| 166 | #endif
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| 167 | #if defined (SIGSTOP)
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| 168 | ENTRY(SIGSTOP, "SIGSTOP", "Stopped (signal)"),
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| 169 | #endif
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| 170 | #if defined (SIGTSTP)
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| 171 | ENTRY(SIGTSTP, "SIGTSTP", "Stopped (user)"),
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| 172 | #endif
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| 173 | #if defined (SIGCONT)
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| 174 | ENTRY(SIGCONT, "SIGCONT", "Continued"),
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| 175 | #endif
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| 176 | #if defined (SIGTTIN)
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| 177 | ENTRY(SIGTTIN, "SIGTTIN", "Stopped (tty input)"),
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| 178 | #endif
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| 179 | #if defined (SIGTTOU)
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| 180 | ENTRY(SIGTTOU, "SIGTTOU", "Stopped (tty output)"),
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| 181 | #endif
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| 182 | #if defined (SIGVTALRM)
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| 183 | ENTRY(SIGVTALRM, "SIGVTALRM", "Virtual timer expired"),
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| 184 | #endif
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| 185 | #if defined (SIGPROF)
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| 186 | ENTRY(SIGPROF, "SIGPROF", "Profiling timer expired"),
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| 187 | #endif
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| 188 | #if defined (SIGXCPU)
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| 189 | ENTRY(SIGXCPU, "SIGXCPU", "CPU time limit exceeded"),
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| 190 | #endif
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| 191 | #if defined (SIGXFSZ)
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| 192 | ENTRY(SIGXFSZ, "SIGXFSZ", "File size limit exceeded"),
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| 193 | #endif
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| 194 | #if defined (SIGWIND)
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| 195 | ENTRY(SIGWIND, "SIGWIND", "SIGWIND"),
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| 196 | #endif
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| 197 | #if defined (SIGPHONE)
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| 198 | ENTRY(SIGPHONE, "SIGPHONE", "SIGPHONE"),
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| 199 | #endif
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| 200 | #if defined (SIGLOST)
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| 201 | ENTRY(SIGLOST, "SIGLOST", "Resource lost"),
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| 202 | #endif
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| 203 | #if defined (SIGWAITING)
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| 204 | ENTRY(SIGWAITING, "SIGWAITING", "Process's LWPs are blocked"),
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| 205 | #endif
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| 206 | #if defined (SIGLWP)
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| 207 | ENTRY(SIGLWP, "SIGLWP", "Signal LWP"),
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| 208 | #endif
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| 209 | #if defined (SIGDANGER)
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| 210 | ENTRY(SIGDANGER, "SIGDANGER", "Swap space dangerously low"),
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| 211 | #endif
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| 212 | #if defined (SIGGRANT)
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| 213 | ENTRY(SIGGRANT, "SIGGRANT", "Monitor mode granted"),
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| 214 | #endif
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| 215 | #if defined (SIGRETRACT)
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| 216 | ENTRY(SIGRETRACT, "SIGRETRACT", "Need to relinguish monitor mode"),
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| 217 | #endif
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| 218 | #if defined (SIGMSG)
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| 219 | ENTRY(SIGMSG, "SIGMSG", "Monitor mode data available"),
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| 220 | #endif
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| 221 | #if defined (SIGSOUND)
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| 222 | ENTRY(SIGSOUND, "SIGSOUND", "Sound completed"),
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| 223 | #endif
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| 224 | #if defined (SIGSAK)
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| 225 | ENTRY(SIGSAK, "SIGSAK", "Secure attention"),
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| 226 | #endif
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| 227 | ENTRY(0, NULL, NULL)
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| 228 | };
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| 229 |
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| 230 | /* Translation table allocated and initialized at runtime. Indexed by the
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| 231 | signal value to find the equivalent symbolic value. */
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| 232 |
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| 233 | static const char **signal_names;
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| 234 | static int num_signal_names = 0;
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| 235 |
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| 236 | /* Translation table allocated and initialized at runtime, if it does not
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| 237 | already exist in the host environment. Indexed by the signal value to find
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| 238 | the descriptive string.
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| 239 |
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| 240 | We don't export it for use in other modules because even though it has the
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| 241 | same name, it differs from other implementations in that it is dynamically
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| 242 | initialized rather than statically initialized. */
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| 243 |
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| 244 | #ifndef HAVE_SYS_SIGLIST
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| 245 |
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| 246 | static int sys_nsig;
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| 247 | static const char **sys_siglist;
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| 248 |
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| 249 | #else
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| 250 |
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| 251 | #ifdef NSIG
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| 252 | static int sys_nsig = NSIG;
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| 253 | #else
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| 254 | #ifdef _NSIG
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| 255 | static int sys_nsig = _NSIG;
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| 256 | #endif
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| 257 | #endif
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| 258 | extern const char * const sys_siglist[];
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| 259 |
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| 260 | #endif
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| 261 |
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| 262 |
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| 263 | /*
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| 264 |
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| 265 | NAME
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| 266 |
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| 267 | init_signal_tables -- initialize the name and message tables
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| 268 |
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| 269 | SYNOPSIS
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| 270 |
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| 271 | static void init_signal_tables ();
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| 272 |
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| 273 | DESCRIPTION
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| 274 |
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| 275 | Using the signal_table, which is initialized at compile time, generate
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| 276 | the signal_names and the sys_siglist (if needed) tables, which are
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| 277 | indexed at runtime by a specific signal value.
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| 278 |
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| 279 | BUGS
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| 280 |
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| 281 | The initialization of the tables may fail under low memory conditions,
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| 282 | in which case we don't do anything particularly useful, but we don't
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| 283 | bomb either. Who knows, it might succeed at a later point if we free
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| 284 | some memory in the meantime. In any case, the other routines know
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| 285 | how to deal with lack of a table after trying to initialize it. This
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| 286 | may or may not be considered to be a bug, that we don't specifically
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| 287 | warn about this particular failure mode.
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| 288 |
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| 289 | */
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| 290 |
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| 291 | static void
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| 292 | init_signal_tables ()
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| 293 | {
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| 294 | const struct signal_info *eip;
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| 295 | int nbytes;
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| 296 |
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| 297 | /* If we haven't already scanned the signal_table once to find the maximum
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| 298 | signal value, then go find it now. */
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| 299 |
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| 300 | if (num_signal_names == 0)
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| 301 | {
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| 302 | for (eip = signal_table; eip -> name != NULL; eip++)
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| 303 | {
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| 304 | if (eip -> value >= num_signal_names)
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| 305 | {
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| 306 | num_signal_names = eip -> value + 1;
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| 307 | }
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| 308 | }
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| 309 | }
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| 310 |
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| 311 | /* Now attempt to allocate the signal_names table, zero it out, and then
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| 312 | initialize it from the statically initialized signal_table. */
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| 313 |
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| 314 | if (signal_names == NULL)
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| 315 | {
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| 316 | nbytes = num_signal_names * sizeof (char *);
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| 317 | if ((signal_names = (const char **) malloc (nbytes)) != NULL)
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| 318 | {
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| 319 | memset (signal_names, 0, nbytes);
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| 320 | for (eip = signal_table; eip -> name != NULL; eip++)
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| 321 | {
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| 322 | signal_names[eip -> value] = eip -> name;
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| 323 | }
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| 324 | }
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| 325 | }
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| 326 |
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| 327 | #ifndef HAVE_SYS_SIGLIST
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| 328 |
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| 329 | /* Now attempt to allocate the sys_siglist table, zero it out, and then
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| 330 | initialize it from the statically initialized signal_table. */
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| 331 |
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| 332 | if (sys_siglist == NULL)
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| 333 | {
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| 334 | nbytes = num_signal_names * sizeof (char *);
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| 335 | if ((sys_siglist = (const char **) malloc (nbytes)) != NULL)
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| 336 | {
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| 337 | memset (sys_siglist, 0, nbytes);
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| 338 | sys_nsig = num_signal_names;
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| 339 | for (eip = signal_table; eip -> name != NULL; eip++)
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| 340 | {
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| 341 | sys_siglist[eip -> value] = eip -> msg;
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| 342 | }
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| 343 | }
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| 344 | }
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| 345 |
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| 346 | #endif
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| 347 |
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| 348 | }
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| 349 |
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| 350 |
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| 351 | /*
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| 352 |
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| 353 | @deftypefn Extension int signo_max (void)
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| 354 |
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| 355 | Returns the maximum signal value for which a corresponding symbolic
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| 356 | name or message is available. Note that in the case where we use the
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| 357 | @code{sys_siglist} supplied by the system, it is possible for there to
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| 358 | be more symbolic names than messages, or vice versa. In fact, the
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| 359 | manual page for @code{psignal(3b)} explicitly warns that one should
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| 360 | check the size of the table (@code{NSIG}) before indexing it, since
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| 361 | new signal codes may be added to the system before they are added to
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| 362 | the table. Thus @code{NSIG} might be smaller than value implied by
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| 363 | the largest signo value defined in @code{<signal.h>}.
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| 364 |
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| 365 | We return the maximum value that can be used to obtain a meaningful
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| 366 | symbolic name or message.
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| 367 |
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| 368 | @end deftypefn
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| 369 |
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