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sighandlers.h
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1997-08-20
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/*
Copyright (C) 1996 John W. Eaton
This file is part of Octave.
Octave is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by the
Free Software Foundation; either version 2, or (at your option) any
later version.
Octave is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with Octave; see the file COPYING. If not, write to the Free
Software Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
*/
// This file should always be included after config.h!
/* Modified by Klaus Gebhardt, 1996 */
#if !defined (octave_sighandlers_h)
#define octave_sighandlers_h 1
#include <string>
#include <Array.h>
#include "syswait.h"
// Signal handler return type.
#ifndef RETSIGTYPE
#define RETSIGTYPE void
#endif
#ifndef BADSIG
#define BADSIG (RETSIGTYPE (*)(int))-1
#endif
// The following signal blocking stuff is stolen from bash:
#define BLOCK_SIGNAL(sig, nvar, ovar) \
do \
{ \
sigemptyset (&nvar); \
sigaddset (&nvar, sig); \
sigemptyset (&ovar); \
sigprocmask (SIG_BLOCK, &nvar, &ovar); \
} \
while (0)
#if defined (HAVE_POSIX_SIGNALS)
#define BLOCK_CHILD(nvar, ovar) BLOCK_SIGNAL (SIGCHLD, nvar, ovar)
#define UNBLOCK_CHILD(ovar) sigprocmask (SIG_SETMASK, &ovar, 0)
#else
#define BLOCK_CHILD(nvar, ovar) ovar = sigblock (sigmask (SIGCHLD))
#define UNBLOCK_CHILD(ovar) sigsetmask (ovar)
#endif
typedef RETSIGTYPE sig_handler (int);
struct
octave_interrupt_handler
{
#ifdef SIGINT
sig_handler *int_handler;
#endif
#ifdef SIGBREAK
sig_handler *brk_handler;
#endif
};
// Nonzero means we have already printed a message for this series of
// SIGPIPES. We assume that the writer will eventually give up.
extern int pipe_handler_error_count;
// Nonzero means we can be interrupted.
extern int can_interrupt;
extern sig_handler *octave_set_signal_handler (int, sig_handler *);
extern void install_signal_handlers (void);
extern octave_interrupt_handler octave_catch_interrupts (void);
extern octave_interrupt_handler octave_ignore_interrupts (void);
extern octave_interrupt_handler
octave_set_interrupt_handler (RETSIGTYPE (*)(int));
extern octave_interrupt_handler
octave_set_interrupt_handler (const volatile octave_interrupt_handler&);
extern void octave_save_signal_mask (void);
extern void octave_restore_signal_mask (void);
// extern void ignore_sigchld (void);
// This is taken directly from Emacs 19:
#ifndef SYS_SIGLIST_DECLARED
extern char *sys_siglist[];
#endif
// Maybe this should be in a separate file?
class
octave_child
{
public:
typedef void (*dead_child_handler) (pid_t, int);
octave_child (pid_t id = -1, dead_child_handler f = 0, string name = "")
: pid (id), handler (f), filename (name) { }
octave_child (const octave_child& oc)
: pid (oc.pid), handler (oc.handler), filename (oc.filename) { }
octave_child& operator = (const octave_child& oc)
{
if (&oc != this)
{
pid = oc.pid;
handler = oc.handler;
filename = oc.filename;
}
return *this;
}
~octave_child (void) { }
// The process id of this child.
pid_t pid;
// The function we call if this child dies.
dead_child_handler handler;
// The file to remove if this child dies.
string filename;
};
class
octave_child_list
{
protected:
octave_child_list (void) : list (0), curr_len (0) { }
public:
~octave_child_list (void) { }
static void insert (pid_t pid, octave_child::dead_child_handler f,
string name = "");
static void remove (pid_t pid);
static int length (void) { return instance ? instance->curr_len : 0; }
static octave_child& elem (int i)
{
static octave_child foo;
if (instance)
{
int n = length ();
if (i >= 0 && i < n)
return instance->list (i);
}
return foo;
}
private:
Array<octave_child> list;
int curr_len;
static octave_child_list *instance;
void do_insert (pid_t pid, octave_child::dead_child_handler f,
string name = "");
void do_remove (pid_t pid);
};
#endif
/*
;;; Local Variables: ***
;;; mode: C++ ***
;;; End: ***
*/