174 lines
4.1 KiB
C++
174 lines
4.1 KiB
C++
/* sigproc.h
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Copyright 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
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2011, 2012 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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__SIGEXIT = -(NSIG + 9),
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__SIGSETPGRP = -(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 *tls;
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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 __stdcall process () __attribute__ ((regparm (1)));
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int setup_handler (void *handler, struct sigaction& siga, _cygtls *tls)
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__attribute__ ((regparm (3)));
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};
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void __stdcall sig_dispatch_pending (bool fast = false)
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__attribute__ ((regparm (1)));
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void set_signal_mask (sigset_t&, sigset_t) __attribute__ ((regparm (2)));
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int __stdcall handle_sigprocmask (int sig, const sigset_t *set,
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sigset_t *oldset, sigset_t& opmask)
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__attribute__ ((regparm (3)));
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void __stdcall sig_clear (int) __attribute__ ((regparm (1)));
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void __stdcall sig_set_pending (int) __attribute__ ((regparm (1)));
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int __stdcall handle_sigsuspend (sigset_t);
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int __stdcall proc_subproc (DWORD, DWORD) __attribute__ ((regparm (2)));
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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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#ifdef __INSIDE_CYGWIN__
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void __stdcall sigproc_terminate (enum exit_states);
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#endif
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bool __stdcall pid_exists (pid_t) __attribute__ ((regparm(1)));
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int __stdcall sig_send (_pinfo *, siginfo_t&, class _cygtls *tls = NULL) __attribute__ ((regparm (3)));
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int __stdcall sig_send (_pinfo *, int) __attribute__ ((regparm (2)));
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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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int killsys (pid_t, 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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