https://sourceware.org/git/gitweb.cgi?p=newlib-cygwin.git;h=0f3e6315712428fcbfc0b6ffeec7c850d9b7206a
commit 0f3e6315712428fcbfc0b6ffeec7c850d9b7206a Author: Corinna Vinschen <[email protected]> Date: Tue Jun 30 20:43:50 2015 +0200 Add comment to sigaltstack to explain setting ss_flags here * signal.cc (sigaltstack): Add comment. Signed-off-by: Corinna Vinschen <[email protected]> Diff: --- winsup/cygwin/ChangeLog | 4 ++++ winsup/cygwin/signal.cc | 4 ++++ 2 files changed, 8 insertions(+) diff --git a/winsup/cygwin/ChangeLog b/winsup/cygwin/ChangeLog index 31b429b..01bb3eb 100644 --- a/winsup/cygwin/ChangeLog +++ b/winsup/cygwin/ChangeLog @@ -1,3 +1,7 @@ +2015-06-30 Corinna Vinschen <[email protected]> + + * signal.cc (sigaltstack): Add comment. + 2015-06-27 Corinna Vinschen <[email protected]> * exceptions.cc (_cygtls::call_signal_handler): Drop manipulating diff --git a/winsup/cygwin/signal.cc b/winsup/cygwin/signal.cc index 467c919..2b9cfda 100644 --- a/winsup/cygwin/signal.cc +++ b/winsup/cygwin/signal.cc @@ -670,6 +670,10 @@ sigaltstack (const stack_t *ss, stack_t *oss) { char stack_marker; memcpy (oss, &me.altstack, sizeof *oss); + /* Check if the current stack is the alternate signal stack. If so, + set ss_flags accordingly. We do this here rather than setting + ss_flags in _cygtls::call_signal_handler since the signal handler + calls longjmp, so we never return to reset the flag. */ if (!me.altstack.ss_flags && me.altstack.ss_sp) { if (&stack_marker >= (char *) me.altstack.ss_sp
