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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Mon, 10 Oct 2011 13:03:14 +0000 (UTC)
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Subject: svn commit: r226205 - in stable/8/sys: kern sys
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Author: kib
Date: Mon Oct 10 13:03:14 2011
New Revision: 226205
URL: http://svn.freebsd.org/changeset/base/226205

Log:
  MFC r225894:
  The sigwait(3) function shall not return EINTR, according to the
  POSIX/SUSvN. The sigwait(2) syscall does return EINTR, and libc.so.7
  contains the wrapper sigwait(3) which hides EINTR from callers.  The
  EINTR return is used by libthr to handle required cancellation point
  in the sigwait(3).
  
  To help the binaries linked against pre-libc.so.7, i.e. RELENG_6 and
  earlier, to have right ABI for sigwait(3), transform EINTR return from
  sigwait(2) into ERESTART.

Modified:
  stable/8/sys/kern/kern_sig.c
  stable/8/sys/sys/param.h
Directory Properties:
  stable/8/sys/   (props changed)
  stable/8/sys/amd64/include/xen/   (props changed)
  stable/8/sys/cddl/contrib/opensolaris/   (props changed)
  stable/8/sys/contrib/dev/acpica/   (props changed)
  stable/8/sys/contrib/pf/   (props changed)

Modified: stable/8/sys/kern/kern_sig.c
==============================================================================
--- stable/8/sys/kern/kern_sig.c	Mon Oct 10 12:30:16 2011	(r226204)
+++ stable/8/sys/kern/kern_sig.c	Mon Oct 10 13:03:14 2011	(r226205)
@@ -1102,6 +1102,8 @@ sigwait(struct thread *td, struct sigwai
 
 	error = kern_sigtimedwait(td, set, &ksi, NULL);
 	if (error) {
+		if (error == EINTR && td->td_proc->p_osrel < P_OSREL_SIGWAIT)
+			error = ERESTART;
 		if (error == ERESTART)
 			return (error);
 		td->td_retval[0] = error;

Modified: stable/8/sys/sys/param.h
==============================================================================
--- stable/8/sys/sys/param.h	Mon Oct 10 12:30:16 2011	(r226204)
+++ stable/8/sys/sys/param.h	Mon Oct 10 13:03:14 2011	(r226205)
@@ -61,6 +61,7 @@
 #define __FreeBSD_version 802512	/* Master, propagated to newvers */
 
 #ifdef _KERNEL
+#define	P_OSREL_SIGWAIT		700000
 #define	P_OSREL_SIGSEGV		700004
 #define	P_OSREL_MAP_ANON	800104
 #endif