1 files changed, 68 insertions, 0 deletions
diff --git a/src/lib/libast/misc/systrace.c b/src/lib/libast/misc/systrace.c
new file mode 100644
index 0000000..a084c29
--- /dev/null
+++ b/src/lib/libast/misc/systrace.c
@@ -0,0 +1,68 @@
+/***********************************************************************
+*                                                                      *
+*               This software is part of the ast package               *
+*          Copyright (c) 1985-2011 AT&T Intellectual Property          *
+*                      and is licensed under the                       *
+*                 Eclipse Public License, Version 1.0                  *
+*                    by AT&T Intellectual Property                     *
+*                                                                      *
+*                A copy of the License is available at                 *
+*          http://www.eclipse.org/org/documents/epl-v10.html           *
+*         (with md5 checksum b35adb5213ca9657e911e9befb180842)         *
+*                                                                      *
+*              Information and Software Systems Research               *
+*                            AT&T Research                             *
+*                           Florham Park NJ                            *
+*                                                                      *
+*                 Glenn Fowler <gsf@research.att.com>                  *
+*                  David Korn <dgk@research.att.com>                   *
+*                   Phong Vo <kpv@research.att.com>                    *
+*                                                                      *
+***********************************************************************/
+#pragma prototyped
+
+/*
+ * trace systems calls if possible
+ */
+
+#include <ast.h>
+#include <error.h>
+#include <proc.h>
+#include <debug.h>
+
+void
+systrace(const char* id)
+{
+	register int	n;
+	register char*	out;
+	char*		s;
+	char		buf[PATH_MAX];
+	char*		av[7];
+	long		ov[2];
+
+	static char*	trace[] = { "trace", "truss", "strace", "traces" };
+
+	if (!(s = getenv("HOME")))
+		return;
+	if (!id && !(id = (const char*)error_info.id))
+		id = (const char*)trace[0];
+	out = buf;
+	out += sfsprintf(out, sizeof(buf), "%s/.%s/%s", s, trace[0], id);
+	if (access(buf, F_OK))
+		return;
+	av[1] = trace[0];
+	av[2] = "-o";
+	av[3] = buf;
+	av[4] = "-p";
+	av[5] = out + 1;
+	av[6] = 0;
+	ov[0] = PROC_FD_DUP(open("/dev/null", O_WRONLY), 2, PROC_FD_PARENT|PROC_FD_CHILD);
+	ov[1] = 0;
+	sfsprintf(out, &buf[sizeof(buf)] - out, ".%d", getpid());
+	for (n = 0; n < elementsof(trace); n++)
+		if (!procfree(procopen(trace[n], av + 1, NiL, ov, PROC_ARGMOD|PROC_GID|PROC_UID|(n == (elementsof(trace) - 1) ? PROC_CLEANUP : 0))))
+		{
+			sleep(1);
+			break;
+		}
+}