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|
/*--------------------------------------------------------------------*/
/*--- Signal-related libc stuff. m_libcsignal.c ---*/
/*--------------------------------------------------------------------*/
/*
This file is part of Valgrind, a dynamic binary instrumentation
framework.
Copyright (C) 2000-2005 Julian Seward
jseward@acm.org
This program 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 of the
License, or (at your option) any later version.
This program 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 this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
02111-1307, USA.
The GNU General Public License is contained in the file COPYING.
*/
#include "pub_core_basics.h"
#include "pub_core_libcbase.h"
#include "pub_core_libcassert.h"
#include "pub_core_libcsignal.h"
#include "pub_core_syscall.h"
#include "vki_unistd.h"
/* sigemptyset, sigfullset, sigaddset and sigdelset return 0 on
success and -1 on error. */
Int VG_(sigfillset)( vki_sigset_t* set )
{
Int i;
if (set == NULL)
return -1;
for (i = 0; i < _VKI_NSIG_WORDS; i++)
set->sig[i] = ~(UWord)0x0;
return 0;
}
Int VG_(sigemptyset)( vki_sigset_t* set )
{
Int i;
if (set == NULL)
return -1;
for (i = 0; i < _VKI_NSIG_WORDS; i++)
set->sig[i] = 0x0;
return 0;
}
Bool VG_(isemptysigset)( const vki_sigset_t* set )
{
Int i;
vg_assert(set != NULL);
for (i = 0; i < _VKI_NSIG_WORDS; i++)
if (set->sig[i] != 0x0) return False;
return True;
}
Bool VG_(isfullsigset)( const vki_sigset_t* set )
{
Int i;
vg_assert(set != NULL);
for (i = 0; i < _VKI_NSIG_WORDS; i++)
if (set->sig[i] != ~(UWord)0x0) return False;
return True;
}
Bool VG_(iseqsigset)( const vki_sigset_t* set1, const vki_sigset_t* set2 )
{
Int i;
vg_assert(set1 != NULL && set2 != NULL);
for (i = 0; i < _VKI_NSIG_WORDS; i++)
if (set1->sig[i] != set2->sig[i]) return False;
return True;
}
Int VG_(sigaddset)( vki_sigset_t* set, Int signum )
{
if (set == NULL)
return -1;
if (signum < 1 || signum > _VKI_NSIG)
return -1;
signum--;
set->sig[signum / _VKI_NSIG_BPW] |= (1UL << (signum % _VKI_NSIG_BPW));
return 0;
}
Int VG_(sigdelset)( vki_sigset_t* set, Int signum )
{
if (set == NULL)
return -1;
if (signum < 1 || signum > _VKI_NSIG)
return -1;
signum--;
set->sig[signum / _VKI_NSIG_BPW] &= ~(1UL << (signum % _VKI_NSIG_BPW));
return 0;
}
Int VG_(sigismember) ( const vki_sigset_t* set, Int signum )
{
if (set == NULL)
return 0;
if (signum < 1 || signum > _VKI_NSIG)
return 0;
signum--;
if (1 & ((set->sig[signum / _VKI_NSIG_BPW]) >> (signum % _VKI_NSIG_BPW)))
return 1;
else
return 0;
}
/* Add all signals in src to dst. */
void VG_(sigaddset_from_set)( vki_sigset_t* dst, vki_sigset_t* src )
{
Int i;
vg_assert(dst != NULL && src != NULL);
for (i = 0; i < _VKI_NSIG_WORDS; i++)
dst->sig[i] |= src->sig[i];
}
/* Remove all signals in src from dst. */
void VG_(sigdelset_from_set)( vki_sigset_t* dst, vki_sigset_t* src )
{
Int i;
vg_assert(dst != NULL && src != NULL);
for (i = 0; i < _VKI_NSIG_WORDS; i++)
dst->sig[i] &= ~(src->sig[i]);
}
/* The functions sigaction, sigprocmask, sigpending and sigsuspend
return 0 on success and -1 on error.
*/
Int VG_(sigprocmask)( Int how, const vki_sigset_t* set, vki_sigset_t* oldset)
{
SysRes res = VG_(do_syscall4)(__NR_rt_sigprocmask,
how, (UWord)set, (UWord)oldset,
_VKI_NSIG_WORDS * sizeof(UWord));
return res.isError ? -1 : 0;
}
Int VG_(sigaction) ( Int signum, const struct vki_sigaction* act,
struct vki_sigaction* oldact)
{
SysRes res = VG_(do_syscall4)(__NR_rt_sigaction,
signum, (UWord)act, (UWord)oldact,
_VKI_NSIG_WORDS * sizeof(UWord));
return res.isError ? -1 : 0;
}
Int VG_(sigaltstack)( const vki_stack_t* ss, vki_stack_t* oss )
{
SysRes res = VG_(do_syscall2)(__NR_sigaltstack, (UWord)ss, (UWord)oss);
return res.isError ? -1 : 0;
}
Int VG_(sigtimedwait)( const vki_sigset_t *set, vki_siginfo_t *info,
const struct vki_timespec *timeout )
{
SysRes res = VG_(do_syscall4)(__NR_rt_sigtimedwait, (UWord)set, (UWord)info,
(UWord)timeout, sizeof(*set));
return res.isError ? -1 : res.val;
}
Int VG_(signal)(Int signum, void (*sighandler)(Int))
{
SysRes res;
Int n;
struct vki_sigaction sa;
sa.ksa_handler = sighandler;
sa.sa_flags = VKI_SA_ONSTACK | VKI_SA_RESTART;
sa.sa_restorer = NULL;
n = VG_(sigemptyset)( &sa.sa_mask );
vg_assert(n == 0);
res = VG_(do_syscall4)(__NR_rt_sigaction, signum, (UWord)&sa, (UWord)NULL,
_VKI_NSIG_WORDS * sizeof(UWord));
return res.isError ? -1 : 0;
}
Int VG_(kill)( Int pid, Int signo )
{
SysRes res = VG_(do_syscall2)(__NR_kill, pid, signo);
return res.isError ? -1 : 0;
}
Int VG_(tkill)( ThreadId tid, Int signo )
{
SysRes res = VG_(mk_SysRes_Error)(VKI_ENOSYS);
#if 0
/* This isn't right because the client may create a process
structure with multiple thread groups */
res = VG_(do_syscall3)(__NR_tgkill, VG_(getpid)(), tid, signo);
#endif
res = VG_(do_syscall2)(__NR_tkill, tid, signo);
if (res.isError && res.val == VKI_ENOSYS)
res = VG_(do_syscall2)(__NR_kill, tid, signo);
return res.isError ? -1 : 0;
}
Int VG_(sigpending) ( vki_sigset_t* set )
{
// Nb: AMD64/Linux doesn't have __NR_sigpending; it only provides
// __NR_rt_sigpending. This function will have to be abstracted in some
// way to account for this. In the meantime, the easy option is to forget
// about it for AMD64 until it's needed.
#if defined(VGA_amd64)
I_die_here;
#else
SysRes res = VG_(do_syscall1)(__NR_sigpending, (UWord)set);
return res.isError ? -1 : 0;
#endif
}
/*--------------------------------------------------------------------*/
/*--- end ---*/
/*--------------------------------------------------------------------*/
|
