a26bb5ea828307358803bc369bbb3c200d266b3d
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
);
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