sig.h

   1 /* sig.h -- header file for signal handler definitions. */
   2
   3 /* Copyright (C) 1994-2009 Free Software Foundation, Inc.
   4
   5    This file is part of GNU Bash, the Bourne Again SHell.
   6
   7    Bash is free software: you can redistribute it and/or modify
   8    it under the terms of the GNU General Public License as published by
   9    the Free Software Foundation, either version 3 of the License, or
  10    (at your option) any later version.
  11
  12    Bash is distributed in the hope that it will be useful,
  13    but WITHOUT ANY WARRANTY; without even the implied warranty of
  14    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15    GNU General Public License for more details.
  16
  17    You should have received a copy of the GNU General Public License
  18    along with Bash.  If not, see <http://www.gnu.org/licenses/>.
  19 */
  20
  21 /* Make sure that this is included *after* config.h! */
  22
  23 #if !defined (_SIG_H_)
  24 #  define _SIG_H_
  25
  26 #include "stdc.h"
  27
  28 #if !defined (SIGABRT) && defined (SIGIOT)
  29 #  define SIGABRT SIGIOT
  30 #endif
  31
  32 #define sighandler RETSIGTYPE
  33 typedef RETSIGTYPE SigHandler __P((int));
  34
  35 #if defined (VOID_SIGHANDLER)
  36 #  define SIGRETURN(n)  return
  37 #else
  38 #  define SIGRETURN(n)  return(n)
  39 #endif /* !VOID_SIGHANDLER */
  40
  41 /* Here is a definition for set_signal_handler () which simply expands to
  42    a call to signal () for non-Posix systems.  The code for set_signal_handler
  43    in the Posix case resides in general.c. */
  44 #if !defined (HAVE_POSIX_SIGNALS)
  45 #  define set_signal_handler(sig, handler) (SigHandler *)signal (sig, handler)
  46 #else
  47 extern SigHandler *set_signal_handler __P((int, SigHandler *)); /* in sig.c */
  48 #endif /* _POSIX_VERSION */
  49
  50 /* Definitions used by the job control code. */
  51 #if defined (JOB_CONTROL)
  52
  53 #if !defined (SIGCHLD) && defined (SIGCLD)
  54 #  define SIGCHLD SIGCLD
  55 #endif
  56
  57 #if !defined (HAVE_POSIX_SIGNALS) && !defined (sigmask)
  58 #  define sigmask(x) (1 << ((x)-1))
  59 #endif /* !HAVE_POSIX_SIGNALS && !sigmask */
  60
  61 #if !defined (HAVE_POSIX_SIGNALS)
  62 #  if !defined (SIG_BLOCK)
  63 #    define SIG_BLOCK 2
  64 #    define SIG_SETMASK 3
  65 #  endif /* SIG_BLOCK */
  66
  67 /* sigset_t defined in config.h */
  68
  69 /* Make sure there is nothing inside the signal set. */
  70 #  define sigemptyset(set) (*(set) = 0)
  71
  72 /* Initialize the signal set to hold all signals. */
  73 #  define sigfillset(set) (*set) = sigmask (NSIG) - 1
  74
  75 /* Add SIG to the contents of SET. */
  76 #  define sigaddset(set, sig) *(set) |= sigmask (sig)
  77
  78 /* Delete SIG from signal set SET. */
  79 #  define sigdelset(set, sig) *(set) &= ~sigmask (sig)
  80
  81 /* Is SIG a member of the signal set SET? */
  82 #  define sigismember(set, sig) ((*(set) & sigmask (sig)) != 0)
  83
  84 /* Suspend the process until the reception of one of the signals
  85    not present in SET. */
  86 #  define sigsuspend(set) sigpause (*(set))
  87 #endif /* !HAVE_POSIX_SIGNALS */
  88
  89 /* These definitions are used both in POSIX and non-POSIX implementations. */
  90
  91 #define BLOCK_SIGNAL(sig, nvar, ovar) \
  92 do { \
  93   sigemptyset (&nvar); \
  94   sigaddset (&nvar, sig); \
  95   sigemptyset (&ovar); \
  96   sigprocmask (SIG_BLOCK, &nvar, &ovar); \
  97 } while (0)
  98
  99 #if defined (HAVE_POSIX_SIGNALS)
 100 #  define BLOCK_CHILD(nvar, ovar) \
 101         BLOCK_SIGNAL (SIGCHLD, nvar, ovar)
 102 #  define UNBLOCK_CHILD(ovar) \
 103         sigprocmask (SIG_SETMASK, &ovar, (sigset_t *) NULL)
 104 #else /* !HAVE_POSIX_SIGNALS */
 105 #  define BLOCK_CHILD(nvar, ovar) ovar = sigblock (sigmask (SIGCHLD))
 106 #  define UNBLOCK_CHILD(ovar) sigsetmask (ovar)
 107 #endif /* !HAVE_POSIX_SIGNALS */
 108
 109 #endif /* JOB_CONTROL */
 110
 111 /* Extern variables */
 112 extern volatile int sigwinch_received;
 113
 114 extern int interrupt_immediately;
 115 extern int terminate_immediately;
 116
 117 /* Functions from sig.c. */
 118 extern sighandler termsig_sighandler __P((int));
 119 extern void termsig_handler __P((int));
 120 extern sighandler sigint_sighandler __P((int));
 121 extern void initialize_signals __P((int));
 122 extern void initialize_terminating_signals __P((void));
 123 extern void reset_terminating_signals __P((void));
 124 extern void top_level_cleanup __P((void));
 125 extern void throw_to_top_level __P((void));
 126 extern void jump_to_top_level __P((int)) __attribute__((__noreturn__));
 127
 128 extern sighandler sigwinch_sighandler __P((int));
 129 extern void set_sigwinch_handler __P((void));
 130 extern void unset_sigwinch_handler __P((void));
 131
 132 /* Functions defined in trap.c. */
 133 extern SigHandler *set_sigint_handler __P((void));
 134 extern SigHandler *trap_to_sighandler __P((int));
 135 extern sighandler trap_handler __P((int));
 136
 137 #endif /* _SIG_H_ */