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From: Konstantin Belousov <kib@FreeBSD.org>
Date: Tue, 3 Jan 2012 09:51:34 +0000 (UTC)
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	svn-src-stable@freebsd.org, svn-src-stable-9@freebsd.org
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Subject: svn commit: r229378 - stable/9/usr.bin/truss
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Author: kib
Date: Tue Jan  3 09:51:34 2012
New Revision: 229378
URL: http://svn.freebsd.org/changeset/base/229378

Log:
  MFC r228261:
  Use explicit information from the kernel to detect the traps due to
  syscall entry and leave.

Modified:
  stable/9/usr.bin/truss/setup.c
Directory Properties:
  stable/9/usr.bin/truss/   (props changed)

Modified: stable/9/usr.bin/truss/setup.c
==============================================================================
--- stable/9/usr.bin/truss/setup.c	Tue Jan  3 09:46:51 2012	(r229377)
+++ stable/9/usr.bin/truss/setup.c	Tue Jan  3 09:51:34 2012	(r229378)
@@ -202,9 +202,19 @@ waitevent(struct trussinfo *info)
 		find_thread(info, lwpinfo.pl_lwpid);
 		switch(WSTOPSIG(waitval)) {
 		case SIGTRAP:
-			info->pr_why = info->curthread->in_syscall?S_SCX:S_SCE;
-			info->curthread->in_syscall = 1 - info->curthread->in_syscall;
-			break;
+			if (lwpinfo.pl_flags & PL_FLAG_SCE) {
+				info->pr_why = S_SCE;
+				info->curthread->in_syscall = 1;
+				break;
+			} else if (lwpinfo.pl_flags & PL_FLAG_SCX) {
+				info->pr_why = S_SCX;
+				info->curthread->in_syscall = 0;
+				break;
+			} else {
+				errx(1,
+		   "pl_flags %x contains neither PL_FLAG_SCE nor PL_FLAG_SCX",
+				    lwpinfo.pl_flags);
+			}
 		default:
 			info->pr_why = S_SIG;
 			info->pr_data = WSTOPSIG(waitval);