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