da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin/***********************************************************************
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* This software is part of the ast package *
3e14f97f673e8a630f076077de35afdd43dc1587Roger A. Faulkner* Copyright (c) 1985-2010 AT&T Intellectual Property *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* and is licensed under the *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Common Public License, Version 1.0 *
7c2fbfb345896881c631598ee3852ce9ce33fb07April Chin* by AT&T Intellectual Property *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* A copy of the License is available at *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* (with md5 checksum 059e8cd6165cb4c31e351f2b69388fd9) *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Information and Software Systems Research *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* AT&T Research *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Florham Park NJ *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Glenn Fowler <gsf@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* David Korn <dgk@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin* Phong Vo <kpv@research.att.com> *
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin***********************************************************************/
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * Glenn Fowler
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * AT&T Research
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * signal critical region support
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinstatic struct
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin#if defined(SIGCHLD) && ( !defined(SIGCLD) || SIGCHLD != SIGCLD || _lib_sigprocmask || _lib_sigsetmask )
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * hold last signal for later delivery
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chinstatic void
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * critical signal region handler
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * op>0 new region according to SIG_REG_*, return region level
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * op==0 pop region, return region level
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * op<0 return non-zero if any signals held in current region
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * signals[] held until region popped
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin register int i;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if ((op & signals[i].op) && (handler[i] = signal(signals[i].sig, interrupt)) == SIG_IGN)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin else if (op < 0)
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin /* no way to get pending signals without installing handler */
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin return hold != 0;
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * a vfork() may have intervened so we
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin * allow apparent nesting mismatches
da2e3ebdc1edfbc5028edf1354e7dd2fa69a7968chin if (--level <= 0)