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authorFrank Ch. Eigler <fche@elastic.org>2008-04-13 17:50:45 -0400
committerFrank Ch. Eigler <fche@elastic.org>2008-04-13 17:50:45 -0400
commitf7e07777e033e580351dc6886ab7dbdddd9839fe (patch)
tree07c4878e3eaf77801d5104c2f6c498cfff9e3bbd /runtime/print.c
parenta9f3ab125303a2e89dd3c17b39f26e1d2c428fa5 (diff)
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runtime backtrace: stop infinite loops by checking for full print buffer
2008-04-13 Frank Ch. Eigler <fche@elastic.org> * print.c (_stp_pbuf_full): New function to note full print buffer. * stack-{i386,x86_64}.c: Use it in all stack-searching loops, to impose another limit against unbounded iteration.
Diffstat (limited to 'runtime/print.c')
-rw-r--r--runtime/print.c10
1 files changed, 10 insertions, 0 deletions
diff --git a/runtime/print.c b/runtime/print.c
index 0442ba09..4f99be7b 100644
--- a/runtime/print.c
+++ b/runtime/print.c
@@ -243,6 +243,16 @@ void _stp_print_char (const char c)
pb->len ++;
}
+/** Check whether the print buffer is full.
+ * @return non-zero if full
+ */
+
+static int _stp_pbuf_full (void)
+{
+ _stp_pbuf *pb = per_cpu_ptr(Stp_pbuf, smp_processor_id());
+ return (pb->len >= STP_BUFFER_SIZE);
+}
+
/* This function is used when printing maps or stats. */
/* Probably belongs elsewhere, but is here for now. */