utils: Add logic to search when the default path for tracefs is not p…

…resent

Find the tracefs path in /proc/mounts with the mntent functions

Signed-off-by: gichoelchoi <gichoel3101@gmail.com>

utils/tracefs.c

@@ -9,25 +9,43 @@
 #include "utils/utils.h"
 
 #define TRACEFS_DIR_PATH "/sys/kernel/tracing"
+#define PROC_MOUNTS_DIR_PATH "/proc/mounts"
 
 static char *TRACING_DIR = NULL;
 
 static bool find_tracing_dir(void)
 {
 	struct statfs fs;
+	struct mntent *ent;
+	FILE *fp;
 	bool found = false;
 
 	if (TRACING_DIR)
 		return true;
 
 	if (!statfs(TRACEFS_DIR_PATH, &fs) && fs.f_type == TRACEFS_MAGIC) {
 		xasprintf(&TRACING_DIR, "%s", TRACEFS_DIR_PATH);
-		pr_dbg2("TRACING_DIR : %s\n", TRACING_DIR);
 
 		return true;
 	}
 
-	pr_dbg2("tracefs or debugfs not found..! \n");
+	fp = setmntent(PROC_MOUNTS_DIR_PATH, "r");
+	if (fp == NULL)
+		return false;
+
+	while ((ent = getmntent(fp)) != NULL) {
+		if (strcmp(ent->mnt_fsname, "tracefs"))
+			continue;
+
+		xasprintf(&TRACING_DIR, "%s", ent->mnt_dir);
+		found = true;
+		break;
+	}
+
+	endmntent(fp);
+
+	if (found != true)
+		pr_dbg2("tracefs or debugfs not found..! \n");
 
 	return found;
 }