bits/signum-generic.h

   1 /* Signal number constants.  Generic template.
   2    Copyright (C) 1991-2023 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library; if not, see
  17    <https://www.gnu.org/licenses/>.  */
  18
  19 #ifndef _BITS_SIGNUM_GENERIC_H
  20 #define _BITS_SIGNUM_GENERIC_H 1
  21
  22 #ifndef _SIGNAL_H
  23 #error "Never include <bits/signum-generic.h> directly; use <signal.h> instead."
  24 #endif
  25
  26 /* Fake signal functions.  */
  27
  28 #define SIG_ERR  ((__sighandler_t) -1)  /* Error return.  */
  29 #define SIG_DFL  ((__sighandler_t)  0)  /* Default action.  */
  30 #define SIG_IGN  ((__sighandler_t)  1)  /* Ignore signal.  */
  31
  32 #ifdef __USE_XOPEN
  33 # define SIG_HOLD ((__sighandler_t) 2)  /* Add signal to hold mask.  */
  34 #endif
  35
  36 /* We define here all the signal names listed in POSIX (1003.1-2008);
  37    as of 1003.1-2013, no additional signals have been added by POSIX.
  38    We also define here signal names that historically exist in every
  39    real-world POSIX variant (e.g. SIGWINCH).
  40
  41    Signals in the 1-15 range are defined with their historical numbers.
  42    For other signals, we use the BSD numbers.
  43    There are two unallocated signal numbers in the 1-31 range: 7 and 29.
  44    Signal number 0 is reserved for use as kill(pid, 0), to test whether
  45    a process exists without sending it a signal.  */
  46
  47 /* ISO C99 signals.  */
  48 #define SIGINT          2       /* Interactive attention signal.  */
  49 #define SIGILL          4       /* Illegal instruction.  */
  50 #define SIGABRT         6       /* Abnormal termination.  */
  51 #define SIGFPE          8       /* Erroneous arithmetic operation.  */
  52 #define SIGSEGV         11      /* Invalid access to storage.  */
  53 #define SIGTERM         15      /* Termination request.  */
  54
  55 /* Historical signals specified by POSIX. */
  56 #define SIGHUP          1       /* Hangup.  */
  57 #define SIGQUIT         3       /* Quit.  */
  58 #define SIGTRAP         5       /* Trace/breakpoint trap.  */
  59 #define SIGKILL         9       /* Killed.  */
  60 #define SIGPIPE         13      /* Broken pipe.  */
  61 #define SIGALRM         14      /* Alarm clock.  */
  62
  63 /* Archaic names for compatibility.  */
  64 #define SIGIO           SIGPOLL /* I/O now possible (4.2 BSD).  */
  65 #define SIGIOT          SIGABRT /* IOT instruction, abort() on a PDP-11.  */
  66 #define SIGCLD          SIGCHLD /* Old System V name */
  67
  68 /* Not all systems support real-time signals.  bits/signum.h indicates
  69    that they are supported by overriding __SIGRTMAX to a value greater
  70    than __SIGRTMIN.  These constants give the kernel-level hard limits,
  71    but some real-time signals may be used internally by glibc.  Do not
  72    use these constants in application code; use SIGRTMIN and SIGRTMAX
  73    (defined in signal.h) instead.  */
  74
  75 /* Include system specific bits.  */
  76 #include <bits/signum-arch.h>
  77
  78 /* Biggest signal number + 1 (including real-time signals).  */
  79 #define _NSIG           (__SIGRTMAX + 1)
  80
  81 #endif /* bits/signum-generic.h.  */