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Provide ucontext to signal handlers 

Add ucontext.h header, defining ucontext_t and mcontext_t types.

Provide sigaction sighandlers with a ucontext_t parameter, containing stack and
context information.

	* include/sys/ucontext.h : New header.
	* include/ucontext.h : Ditto.
	* exceptions.cc (call_signal_handler): Provide ucontext_t
	parameter to signal handler function.

Signed-off-by: Jon TURNEY <jon.turney@dronecode.org.uk>
This commit is contained in:
Jon TURNEY 2015-03-30 20:31:13 +01:00 committed by Corinna Vinschen
parent 38a8d3e216
commit 9e8932d6da
4 changed files with 70 additions and 2 deletions
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7
winsup/cygwin/ChangeLog
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@ -1,3 +1,10 @@
2015-04-01 Jon TURNEY <jon.turney@dronecode.org.uk>
* include/sys/ucontext.h : New header.
* include/ucontext.h : Ditto.
* exceptions.cc (call_signal_handler): Provide ucontext_t
parameter to signal handler function.
2015-04-01 Jon TURNEY <jon.turney@dronecode.org.uk>
* external.cc (cygwin_internal): Add operation to retrieve a copy

23
winsup/cygwin/exceptions.cc
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@ -16,6 +16,7 @@ details. */
#include <stdlib.h>
#include <syslog.h>
#include <wchar.h>
#include <ucontext.h>
#include "cygtls.h"
#include "pinfo.h"
@ -1489,15 +1490,33 @@ _cygtls::call_signal_handler ()
siginfo_t thissi = infodata;
void (*thisfunc) (int, siginfo_t *, void *) = func;
ucontext_t thiscontext;
thiscontext.uc_link = 0;
thiscontext.uc_flags = 0;
if (thissi.si_cyg)
memcpy (&thiscontext.uc_mcontext, ((cygwin_exception *)thissi.si_cyg)->context(), sizeof(CONTEXT));
else
RtlCaptureContext ((CONTEXT *)&thiscontext.uc_mcontext);
/* FIXME: Really this should be the context which the signal interrupted? */
/* FIXME: If/when sigaltstack is implemented, this will need to do
something more complicated */
thiscontext.uc_stack.ss_sp = NtCurrentTeb ()->Tib.StackBase;
thiscontext.uc_stack.ss_flags = 0;
if (!NtCurrentTeb ()->DeallocationStack)
thiscontext.uc_stack.ss_size = (uintptr_t)NtCurrentTeb ()->Tib.StackLimit - (uintptr_t)NtCurrentTeb ()->Tib.StackBase;
else
thiscontext.uc_stack.ss_size = (uintptr_t)NtCurrentTeb ()->DeallocationStack - (uintptr_t)NtCurrentTeb ()->Tib.StackBase;
sigset_t this_oldmask = set_process_mask_delta ();
thiscontext.uc_sigmask = this_oldmask;
int this_errno = saved_errno;
reset_signal_arrived ();
incyg = false;
sig = 0; /* Flag that we can accept another signal */
unlock (); /* unlock signal stack */
/* no ucontext_t information provided yet, so third arg is NULL */
thisfunc (thissig, &thissi, NULL);
thisfunc (thissig, &thissi, &thiscontext);
incyg = true;
set_signal_mask (_my_tls.sigmask, this_oldmask);

26
winsup/cygwin/include/sys/ucontext.h Normal file
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@ -0,0 +1,26 @@
/* ucontext.h
Copyright 2015 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. */
#ifndef _SYS_UCONTEXT_H_
#define _SYS_UCONTEXT_H_
#include <signal.h>
typedef struct __mcontext mcontext_t;
typedef struct __ucontext {
struct __ucontext *uc_link;
sigset_t uc_sigmask;
stack_t uc_stack;
mcontext_t uc_mcontext;
unsigned long int uc_flags;
} ucontext_t;
#endif /* !_SYS_UCONTEXT_H_ */

16
winsup/cygwin/include/ucontext.h Normal file
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@ -0,0 +1,16 @@
/* ucontext.h
Copyright 2015 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. */
#ifndef _UCONTEXT_H
#define _UCONTEXT_H
#include <sys/ucontext.h>
#endif /* _UCONTEXT_H */