12 #include "tracing_path.h"
15 char tracing_mnt[PATH_MAX] = "/sys/kernel/debug";
16 char tracing_path[PATH_MAX] = "/sys/kernel/debug/tracing";
17 char tracing_events_path[PATH_MAX] = "/sys/kernel/debug/tracing/events";
20 static void __tracing_path_set(const char *tracing, const char *mountpoint)
22 snprintf(tracing_mnt, sizeof(tracing_mnt), "%s", mountpoint);
23 snprintf(tracing_path, sizeof(tracing_path), "%s/%s",
25 snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s%s",
26 mountpoint, tracing, "events");
29 static const char *tracing_path_tracefs_mount(void)
33 mnt = tracefs__mount();
37 __tracing_path_set("", mnt);
42 static const char *tracing_path_debugfs_mount(void)
46 mnt = debugfs__mount();
50 __tracing_path_set("tracing/", mnt);
55 const char *tracing_path_mount(void)
59 mnt = tracing_path_tracefs_mount();
63 mnt = tracing_path_debugfs_mount();
68 void tracing_path_set(const char *mntpt)
70 __tracing_path_set("tracing/", mntpt);
73 char *get_tracing_file(const char *name)
77 if (asprintf(&file, "%s/%s", tracing_path, name) < 0)
83 void put_tracing_file(char *file)
88 static int strerror_open(int err, char *buf, size_t size, const char *filename)
95 * We will get here if we can't find the tracepoint, but one of
96 * debugfs or tracefs is configured, which means you probably
97 * want some tracepoint which wasn't compiled in your kernel.
100 if (debugfs__configured() || tracefs__configured()) {
102 "Error:\tFile %s/%s not found.\n"
103 "Hint:\tPerhaps this kernel misses some CONFIG_ setting to enable this feature?.\n",
104 tracing_events_path, filename);
107 snprintf(buf, size, "%s",
108 "Error:\tUnable to find debugfs/tracefs\n"
109 "Hint:\tWas your kernel compiled with debugfs/tracefs support?\n"
110 "Hint:\tIs the debugfs/tracefs filesystem mounted?\n"
111 "Hint:\tTry 'sudo mount -t debugfs nodev /sys/kernel/debug'");
115 "Error:\tNo permissions to read %s/%s\n"
116 "Hint:\tTry 'sudo mount -o remount,mode=755 %s'\n",
117 tracing_events_path, filename, tracing_mnt);
121 snprintf(buf, size, "%s", strerror_r(err, sbuf, sizeof(sbuf)));
128 int tracing_path__strerror_open_tp(int err, char *buf, size_t size, const char *sys, const char *name)
132 snprintf(path, PATH_MAX, "%s/%s", sys, name ?: "*");
134 return strerror_open(err, buf, size, path);