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Handle exceptions in sigaltstack 

* signal.cc (sigaltstack): Add fault handler.

Signed-off-by: Corinna Vinschen <corinna@vinschen.de>
This commit is contained in:
Corinna Vinschen 2015-06-20 18:48:09 +02:00
parent 22465796ed
commit 74d272cc02
1 changed files with 35 additions and 21 deletions
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56
winsup/cygwin/signal.cc
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@ -630,35 +630,49 @@ sigaltstack (const stack_t *ss, stack_t *oss)
{
_cygtls& me = _my_tls;
if (ss)
__try
{
if (me.altstack.ss_flags == SS_ONSTACK)
if (ss)
{
set_errno (EPERM);
return -1;
}
if (ss->ss_flags == SS_DISABLE)
{
me.altstack.ss_sp = NULL;
me.altstack.ss_flags = 0;
me.altstack.ss_size = 0;
}
else
{
if (ss->ss_flags)
if (me.altstack.ss_flags == SS_ONSTACK)
{
set_errno (EINVAL);
/* An attempt was made to modify an active stack. */
set_errno (EPERM);
return -1;
}
if (ss->ss_size < MINSIGSTKSZ)
if (ss->ss_flags == SS_DISABLE)
{
set_errno (ENOMEM);
return -1;
me.altstack.ss_sp = NULL;
me.altstack.ss_flags = 0;
me.altstack.ss_size = 0;
}
else
{
if (ss->ss_flags)
{
/* The ss argument is not a null pointer, and the ss_flags
member pointed to by ss contains flags other than
SS_DISABLE. */
set_errno (EINVAL);
return -1;
}
if (ss->ss_size < MINSIGSTKSZ)
{
/* The size of the alternate stack area is less than
MINSIGSTKSZ. */
set_errno (ENOMEM);
return -1;
}
memcpy (&me.altstack, ss, sizeof *ss);
}
memcpy (&me.altstack, ss, sizeof *ss);
}
if (oss)
memcpy (oss, &me.altstack, sizeof *oss);
}
if (oss)
memcpy (oss, &me.altstack, sizeof *oss);
__except (EFAULT)
{
return EFAULT;
}
__endtry
return 0;
}