Not everyone mounts debugfs at /debug. This patch makes cyclictest search
for debugfs in the /proc/mounts directory.
Signed-off-by: Steven Rostedt <srostedt@xxxxxxxxxx>
---
src/cyclictest/cyclictest.c | 46 ++++++++++++++++++++++++++++++++++++++++++--
1 file changed, 44 insertions(+), 2 deletions(-)
Index: rt-tests/src/cyclictest/cyclictest.c
===================================================================
--- rt-tests.orig/src/cyclictest/cyclictest.c 2008-06-03 11:33:05.000000000 -0400
+++ rt-tests/src/cyclictest/cyclictest.c 2008-06-03 11:44:57.000000000 -0400
@@ -126,8 +126,12 @@ static struct kvars {
char value[KVALUELEN];
} kv[KVARS];
+#define _STR(x) #x
+#define STR(x) _STR(x)
+#define MAX_PATH 256
+
static char *procfileprefix = "/proc/sys/kernel/";
-static char *debugfileprefix = "/debug/tracing/";
+static char debugfileprefix[MAX_PATH];
enum kernelversion {
KV_NOT_26,
@@ -136,6 +140,43 @@ enum kernelversion {
KV_26_CURR
};
+enum {
+ ERROR_GENERAL = -1,
+ ERROR_NOTFOUND = -2,
+};
+
+/*
+ * Finds the path to the debugfs/tracing
+ */
+static int set_debugfileprefix(void)
+{
+ char type[100];
+ FILE *fp;
+ int size;
+
+ if ((fp = fopen("/proc/mounts","r")) == NULL)
+ return ERROR_GENERAL;
+
+ while (fscanf(fp, "%*s %"
+ STR(MAX_PATH)
+ "s %99s %*s %*d %*d\n",
+ debugfileprefix, type) == 2) {
+ if (strcmp(type, "debugfs") == 0)
+ break;
+ }
+ fclose(fp);
+
+ if (strcmp(type, "debugfs") != 0)
+ return ERROR_NOTFOUND;
+
+ size = strlen(debugfileprefix);
+ size = MAX_PATH - size;
+
+ strncat(debugfileprefix, "/tracing", size);
+
+ return 0;
+}
+
static int kernvar(int mode, char *name, char *value, size_t sizeofvalue)
{
char filename[128];
@@ -702,8 +743,9 @@ int main(int argc, char **argv)
fprintf(stderr, "WARNING: Most functions require kernel 2.6\n");
if (tracelimit && kernelversion == KV_26_CURR) {
- char testname[32];
+ char testname[MAX_PATH];
+ set_debugfileprefix();
strcpy(testname, debugfileprefix);
strcat(testname, "tracing_enabled");
if (access(testname, R_OK)) {
--
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