sig.h

   1 /* sig.h -- header file for signal handler definitions. */
   2
   3 /* Copyright (C) 1994 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 it under
   8    the terms of the GNU General Public License as published by the Free
   9    Software Foundation; either version 2, or (at your option) any later
  10    version.
  11
  12    Bash is distributed in the hope that it will be useful, but WITHOUT ANY
  13    WARRANTY; without even the implied warranty of MERCHANTABILITY or
  14    FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  15    for more details.
  16
  17    You should have received a copy of the GNU General Public License along
  18    with Bash; see the file COPYING.  If not, write to the Free Software
  19    Foundation, 675 Mass Ave, Cambridge, MA 02139, USA. */
  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 ();
  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 ();       /* 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   sigemptyset (&nvar); \
  93   sigaddset (&nvar, sig); \
  94   sigemptyset (&ovar); \
  95   sigprocmask (SIG_BLOCK, &nvar, &ovar)
  96
  97 #if defined (HAVE_POSIX_SIGNALS)
  98 #  define BLOCK_CHILD(nvar, ovar) \
  99         BLOCK_SIGNAL (SIGCHLD, nvar, ovar)
 100 #  define UNBLOCK_CHILD(ovar) \
 101         sigprocmask (SIG_SETMASK, &ovar, (sigset_t *) NULL)
 102 #else /* !HAVE_POSIX_SIGNALS */
 103 #  define BLOCK_CHILD(nvar, ovar) ovar = sigblock (sigmask (SIGCHLD))
 104 #  define UNBLOCK_CHILD(ovar) sigsetmask (ovar)
 105 #endif /* !HAVE_POSIX_SIGNALS */
 106
 107 #endif /* JOB_CONTROL */
 108
 109 /* Functions from sig.c. */
 110 extern sighandler termination_unwind_protect __P((int));
 111 extern sighandler sigint_sighandler __P((int));
 112 extern void initialize_signals __P((void));
 113 extern void reinitialize_signals __P((void));
 114 extern void initialize_terminating_signals __P((void));
 115 extern void reset_terminating_signals __P((void));
 116 extern void throw_to_top_level __P((void));
 117 extern void jump_to_top_level __P((int));
 118
 119 /* Functions defined in trap.c. */
 120 extern SigHandler *set_sigint_handler __P((void));
 121 extern SigHandler *trap_to_sighandler __P((int));
 122 extern sighandler trap_handler __P((int));
 123
 124 #endif /* _SIG_H_ */