169 lines
3.8 KiB
C++
169 lines
3.8 KiB
C++
/* sigproc.h
|
|
|
|
Copyright 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2009, 2010,
|
|
2011, 2012, 2013 Red Hat, Inc.
|
|
|
|
This file is part of Cygwin.
|
|
|
|
This software is a copyrighted work licensed under the terms of the
|
|
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
|
|
details. */
|
|
|
|
#pragma once
|
|
#include <signal.h>
|
|
#include "sync.h"
|
|
|
|
#ifdef NSIG
|
|
enum
|
|
{
|
|
__SIGFLUSH = -(NSIG + 1),
|
|
__SIGSTRACE = -(NSIG + 2),
|
|
__SIGCOMMUNE = -(NSIG + 3),
|
|
__SIGPENDING = -(NSIG + 4),
|
|
__SIGDELETE = -(NSIG + 5), /* Not currently used */
|
|
__SIGFLUSHFAST = -(NSIG + 6),
|
|
__SIGHOLD = -(NSIG + 7),
|
|
__SIGNOHOLD = -(NSIG + 8),
|
|
__SIGSETPGRP = -(NSIG + 9),
|
|
__SIGTHREADEXIT = -(NSIG + 10)
|
|
};
|
|
#endif
|
|
|
|
#define SIG_BAD_MASK (1 << (SIGKILL - 1))
|
|
|
|
enum procstuff
|
|
{
|
|
PROC_ADDCHILD = 1, // add a new subprocess to list
|
|
PROC_REATTACH_CHILD = 2, // reattach after exec
|
|
PROC_EXEC_CLEANUP = 3, // cleanup waiting children after exec
|
|
PROC_DETACHED_CHILD = 4, // set up a detached child
|
|
PROC_CLEARWAIT = 5, // clear all waits - signal arrived
|
|
PROC_WAIT = 6, // setup for wait() for subproc
|
|
PROC_EXECING = 7, // used to get a lock when execing
|
|
PROC_NOTHING = 8 // nothing, really
|
|
};
|
|
|
|
struct sigpacket
|
|
{
|
|
siginfo_t si;
|
|
pid_t pid;
|
|
class _cygtls *sigtls;
|
|
sigset_t *mask;
|
|
union
|
|
{
|
|
HANDLE wakeup;
|
|
HANDLE thread_handle;
|
|
struct sigpacket *next;
|
|
};
|
|
int __reg1 process ();
|
|
int __reg3 setup_handler (void *, struct sigaction&, _cygtls *);
|
|
};
|
|
|
|
void __reg1 sig_dispatch_pending (bool fast = false);
|
|
void __reg2 set_signal_mask (sigset_t&, sigset_t);
|
|
int __reg3 handle_sigprocmask (int sig, const sigset_t *set,
|
|
sigset_t *oldset, sigset_t& opmask);
|
|
|
|
void __reg1 sig_clear (int);
|
|
void __reg1 sig_set_pending (int);
|
|
int __stdcall handle_sigsuspend (sigset_t);
|
|
|
|
int __reg2 proc_subproc (DWORD, uintptr_t);
|
|
|
|
class _pinfo;
|
|
void __stdcall proc_terminate ();
|
|
void __stdcall sigproc_init ();
|
|
bool __reg1 pid_exists (pid_t);
|
|
int __reg3 sig_send (_pinfo *, siginfo_t&, class _cygtls * = NULL);
|
|
int __reg3 sig_send (_pinfo *, int, class _cygtls * = NULL);
|
|
void __stdcall signal_fixup_after_exec ();
|
|
void __stdcall sigalloc ();
|
|
|
|
int kill_pgrp (pid_t, siginfo_t&);
|
|
void __reg1 exit_thread (DWORD) __attribute__ ((noreturn));
|
|
void __reg1 setup_signal_exit (int);
|
|
|
|
extern "C" void sigdelayed ();
|
|
|
|
extern char myself_nowait_dummy[];
|
|
|
|
extern struct sigaction *global_sigs;
|
|
|
|
class lock_signals
|
|
{
|
|
bool worked;
|
|
public:
|
|
lock_signals ()
|
|
{
|
|
worked = sig_send (NULL, __SIGHOLD) == 0;
|
|
}
|
|
operator int () const
|
|
{
|
|
return worked;
|
|
}
|
|
void dont_bother ()
|
|
{
|
|
worked = false;
|
|
}
|
|
~lock_signals ()
|
|
{
|
|
if (worked)
|
|
sig_send (NULL, __SIGNOHOLD);
|
|
}
|
|
};
|
|
|
|
class lock_pthread
|
|
{
|
|
bool bother;
|
|
public:
|
|
lock_pthread (): bother (1)
|
|
{
|
|
pthread::atforkprepare ();
|
|
}
|
|
void dont_bother ()
|
|
{
|
|
bother = false;
|
|
}
|
|
~lock_pthread ()
|
|
{
|
|
if (bother)
|
|
pthread::atforkparent ();
|
|
}
|
|
};
|
|
|
|
class hold_everything
|
|
{
|
|
bool& ischild;
|
|
/* Note the order of the locks below. It is important,
|
|
to avoid races, that the lock order be preserved.
|
|
|
|
pthread is first because it serves as a master lock
|
|
against other forks being attempted while this one is active.
|
|
|
|
signals is next to stop signal processing for the duration
|
|
of the fork.
|
|
|
|
process is last. If it is put before signals, then a deadlock
|
|
could be introduced if the process attempts to exit due to a signal. */
|
|
lock_pthread pthread;
|
|
lock_signals signals;
|
|
lock_process process;
|
|
|
|
public:
|
|
hold_everything (bool& x): ischild (x) {}
|
|
operator int () const {return signals;}
|
|
|
|
~hold_everything()
|
|
{
|
|
if (ischild)
|
|
{
|
|
pthread.dont_bother ();
|
|
process.dont_bother ();
|
|
signals.dont_bother ();
|
|
}
|
|
}
|
|
|
|
};
|
|
|
|
#define myself_nowait ((_pinfo *) myself_nowait_dummy)
|