In order to make kprobe APIs consistent with the other libtracefs APIs,
the tracefs_kprobe_info() API is reimplemented and changed to work with
the library kprobe context structure.
Signed-off-by: Tzvetomir Stoyanov (VMware) <tz.stoyanov@xxxxxxxxx>
---
include/tracefs.h | 5 +-
src/tracefs-kprobes.c | 175 ++++++++++++++++--------------------------
2 files changed, 69 insertions(+), 111 deletions(-)
diff --git a/include/tracefs.h b/include/tracefs.h
index d4ac8fb..c65f21f 100644
--- a/include/tracefs.h
+++ b/include/tracefs.h
@@ -260,8 +260,9 @@ int tracefs_kprobe_raw(const char *system, const char *event,
int tracefs_kretprobe_raw(const char *system, const char *event,
const char *addr, const char *format);
int tracefs_kprobes_get(enum tracefs_kprobe_type type, struct tracefs_dynevent ***kprobes);
-enum tracefs_kprobe_type tracefs_kprobe_info(const char *group, const char *event,
- char **type, char **addr, char **format);
+enum tracefs_kprobe_type tracefs_kprobe_info(struct tracefs_dynevent *kprobe,
+ char **system, char **event,
+ char **prefix, char **addr, char **format);
enum tracefs_hist_key_type {
TRACEFS_HIST_KEY_NORMAL = 0,
diff --git a/src/tracefs-kprobes.c b/src/tracefs-kprobes.c
index 2e24051..083a3a9 100644
--- a/src/tracefs-kprobes.c
+++ b/src/tracefs-kprobes.c
@@ -234,58 +234,6 @@ int tracefs_kretprobe_raw(const char *system, const char *event,
return insert_kprobe("r", system, event, addr, format);
}
-/*
- * Helper function to parse kprobes.
- * @content: The content of kprobe_events on the first iteration.
- * NULL on next iterations.
- * @saveptr: Same as saveptr for strtok_r
- * @type: Where to store the type (before ':')
- * @system: Store the system of the kprobe (NULL to have event contain
- * both system and event, as in "kprobes/myprobe").
- * @event: Where to store the event.
- * @addr: Where to store the addr (may be NULL to ignore)
- * @format: Where to store the format (may be NULL to ignore)
- */
-static int parse_kprobe(char *content, char **saveptr,
- char **type, char **system, char **event,
- char **addr, char **format)
-{
- char *p;
-
- p = strtok_r(content, ":", saveptr);
- if (!p)
- return 1; /* eof */
- *type = p;
-
- if (system) {
- p = strtok_r(NULL, "/", saveptr);
- if (!p)
- return -1;
- *system = p;
- }
-
- p = strtok_r(NULL, " ", saveptr);
- if (!p)
- return -1;
- *event = p;
-
- if (addr || format) {
- p = strtok_r(NULL, " ", saveptr);
- if (!p)
- return -1;
- if (addr)
- *addr = p;
- }
-
- p = strtok_r(NULL, "\n", saveptr);
- if (!p)
- return -1;
- if (format)
- *format = p;
-
- return 0;
-}
-
/**
* tracefs_kprobes_get - return an array of pointers to kprobes
* @type: The type of kprobes to return.
@@ -316,74 +264,83 @@ int tracefs_kprobes_get(enum tracefs_kprobe_type type, struct tracefs_dynevent *
}
/**
- * tracefs_kprobe_info - return the type of kprobe specified.
- * @group: The group the kprobe is in (NULL for the default "kprobes")
- * @event: The name of the kprobe to find.
- * @type: String to return kprobe type (before ':') NULL to ignore.
- * @addr: String to return address kprobe is attached to. NULL to ignore.
- * @format: String to return kprobe format. NULL to ignore.
+ * tracefs_kprobe_info - return details of a kprobe
+ * @kprobe: A kprobe context, describing given kprobe.
+ * @group: return, group in which the kprobe is configured
+ * @event: return, name of the kprobe event
+ * @prefix: return, prefix string of the kprobe
+ * for kretprobes, the maxactive count is encoded in the prefix
+ * @addr: return, the function and offset (or address) of the kprobe
+ * @format: return, the format string of the kprobe
*
- * If @type, @addr, or @format is non NULL, then the returned string
- * must be freed with free(). They will also be set to NULL, and
- * even on error, they may contain strings to be freed. If they are
- * not NULL, then they still need to be freed.
- *
- * Returns TRACEFS_ALL_KPROBES if an error occurs or the kprobe is not found,
- * or the probe is of an unknown type.
- * TRACEFS_KPROBE if the type of kprobe found is a normal kprobe.
- * TRACEFS_KRETPROBE if the type of kprobe found is a kretprobe.
+ * Returns the type of the kprobe, or TRACEFS_ALL_KPROBES in case of an error.
+ * Any of the @group, @event, @prefix, @addr and @format parameters are optional.
+ * If a valid pointer is passed, in case of success - a string is allocated and returned.
+ * These strings must be freed with free().
*/
-enum tracefs_kprobe_type tracefs_kprobe_info(const char *group, const char *event,
- char **type, char **addr, char **format)
+enum tracefs_kprobe_type tracefs_kprobe_info(struct tracefs_dynevent *kprobe,
+ char **system, char **event,
+ char **prefix, char **addr, char **format)
{
- enum tracefs_kprobe_type rtype = TRACEFS_ALL_KPROBES;
- char *saveptr;
- char *content;
- char *system;
- char *probe;
- char *ktype;
- char *kaddr;
- char *kfmt;
- int ret;
-
- if (!group)
- group = KPROBE_DEFAULT_GROUP;
-
- if (type)
- *type = NULL;
+ if (system)
+ *system = NULL;
+ if (event)
+ *event = NULL;
+ if (prefix)
+ *prefix = NULL;
if (addr)
*addr = NULL;
if (format)
*format = NULL;
- content = tracefs_instance_file_read(NULL, KPROBE_EVENTS, NULL);
- if (!content)
- return rtype;
-
- ret = parse_kprobe(content, &saveptr, &ktype, &system, &probe,
- &kaddr, &kfmt);
-
- while (!ret) {
-
- if (!strcmp(system, group) && !strcmp(probe, event)) {
- if (type)
- *type = strdup(ktype);
- if (addr)
- *addr = strdup(kaddr);
- if (format)
- *format = strdup(kfmt);
+ if (!kprobe)
+ return TRACEFS_ALL_KPROBES;
- switch (*ktype) {
- case 'p': rtype = TRACEFS_KPROBE; break;
- case 'r': rtype = TRACEFS_KRETPROBE; break;
- }
- break;
+ if (system) {
+ if (kprobe->system) {
+ *system = strdup(kprobe->system);
+ if (!(*system))
+ goto error;
}
- ret = parse_kprobe(NULL, &saveptr, &ktype, &system, &probe,
- &kaddr, &kfmt);
}
- free(content);
- return rtype;
+ if (event) {
+ *event = strdup(kprobe->event);
+ if (!(*event))
+ goto error;
+ }
+ if (prefix) {
+ *prefix = strdup(kprobe->prefix);
+ if (!(*prefix))
+ goto error;
+ }
+ if (addr && kprobe->address) {
+ *addr = strdup(kprobe->address);
+ if (!(*addr))
+ goto error;
+ }
+ if (format && kprobe->format) {
+ *format = strdup(kprobe->format);
+ if (!(*format))
+ goto error;
+ }
+
+ if (kprobe->type == TRACE_DYNEVENT_KPROBE)
+ return TRACEFS_KPROBE;
+ if (kprobe->type == TRACE_DYNEVENT_KRETPROBE)
+ return TRACEFS_KRETPROBE;
+
+error:
+ if (system)
+ free(*system);
+ if (event)
+ free(*event);
+ if (prefix)
+ free(*prefix);
+ if (addr)
+ free(*addr);
+ if (format)
+ free(*format);
+ return TRACEFS_ALL_KPROBES;
}
static void disable_events(const char *system, const char *event,
--
2.31.1
|