Backporting options support for traceevent lib.
It's now possible to use following interface
to load options for 'struct pevent' object:
void traceevent_add_options(const char *name, struct plugin_option *options);
- adds a set of options by a plugin
void traceevent_remove_options(struct plugin_option *options);
- removes plugin options that were registered
void traceevent_add_option(const char *name, const char *val);
- modifies plugin option
Signed-off-by: Jiri Olsa <jo...@redhat.com>
Cc: Corey Ashford <cjash...@linux.vnet.ibm.com>
Cc: Frederic Weisbecker <fweis...@gmail.com>
Cc: Ingo Molnar <mi...@elte.hu>
Cc: Namhyung Kim <namhy...@kernel.org>
Cc: Paul Mackerras <pau...@samba.org>
Cc: Peter Zijlstra <a.p.zijls...@chello.nl>
Cc: Arnaldo Carvalho de Melo <a...@redhat.com>
Cc: Steven Rostedt <rost...@goodmis.org>
Cc: David Ahern <dsah...@gmail.com>
---
tools/lib/traceevent/Makefile | 2 +-
tools/lib/traceevent/event-option.c | 278 ++++++++++++++++++++++++++++++++++++
tools/lib/traceevent/event-parse.h | 4 +
3 files changed, 283 insertions(+), 1 deletion(-)
create mode 100644 tools/lib/traceevent/event-option.c
diff --git a/tools/lib/traceevent/Makefile b/tools/lib/traceevent/Makefile
index 539f3e5..99da843 100644
--- a/tools/lib/traceevent/Makefile
+++ b/tools/lib/traceevent/Makefile
@@ -180,7 +180,7 @@ $(obj)/%.o: $(src)/%.c
%.o: $(src)/%.c
$(Q)$(call do_compile)
-PEVENT_LIB_OBJS = event-parse.o event-plugin.o trace-seq.o parse-filter.o
parse-utils.o
+PEVENT_LIB_OBJS = event-parse.o event-plugin.o trace-seq.o parse-filter.o
parse-utils.o event-option.o
PEVENT_LIB_OBJS += kbuffer-parse.o
ALL_OBJS = $(PEVENT_LIB_OBJS)
diff --git a/tools/lib/traceevent/event-option.c
b/tools/lib/traceevent/event-option.c
new file mode 100644
index 0000000..61181be
--- /dev/null
+++ b/tools/lib/traceevent/event-option.c
@@ -0,0 +1,278 @@
+
+#include <stdlib.h>
+#include <string.h>
+#include "event-parse.h"
+#include "event-utils.h"
+
+static struct trace_plugin_options {
+ struct trace_plugin_options *next;
+ char *plugin;
+ char *option;
+ char *value;
+} *trace_plugin_options;
+
+static struct registered_plugin_options {
+ struct registered_plugin_options *next;
+ struct plugin_option *options;
+} *registered_options;
+
+static void update_option(const char *file, struct plugin_option *option)
+{
+ struct trace_plugin_options *op;
+ char *plugin;
+
+ if (option->plugin_alias) {
+ plugin = strdup(option->plugin_alias);
+ if (!plugin)
+ die("malloc");
+ } else {
+ char *p;
+ plugin = strdup(file);
+ if (!plugin)
+ die("malloc");
+ p = strstr(plugin, ".");
+ if (p)
+ *p = '\0';
+ }
+
+ /* first look for named options */
+ for (op = trace_plugin_options; op; op = op->next) {
+ if (!op->plugin)
+ continue;
+ if (strcmp(op->plugin, plugin) != 0)
+ continue;
+ if (strcmp(op->option, option->name) != 0)
+ continue;
+
+ option->value = op->value;
+ option->set ^= 1;
+ goto out;
+ }
+
+ /* first look for unnamed options */
+ for (op = trace_plugin_options; op; op = op->next) {
+ if (op->plugin)
+ continue;
+ if (strcmp(op->option, option->name) != 0)
+ continue;
+
+ option->value = op->value;
+ option->set ^= 1;
+ break;
+ }
+
+ out:
+ free(plugin);
+}
+
+/**
+ * trace_util_add_options - Add a set of options by a plugin
+ * @name: The name of the plugin adding the options
+ * @options: The set of options being loaded
+ *
+ * Sets the options with the values that have been added by user.
+ */
+void traceevent_add_options(const char *name, struct plugin_option *options)
+{
+ struct registered_plugin_options *reg;
+
+ reg = malloc_or_die(sizeof(*reg));
+ reg->next = registered_options;
+ reg->options = options;
+ registered_options = reg;
+
+ while (options->name) {
+ update_option("ftrace", options);
+ options++;
+ }
+}
+
+/**
+ * trace_util_remove_options - remove plugin options that were registered
+ * @options: Options to removed that were registered with
trace_util_add_options
+ */
+void traceevent_remove_options(struct plugin_option *options)
+{
+ struct registered_plugin_options **last;
+ struct registered_plugin_options *reg;
+
+ for (last = ®istered_options; *last; last = &(*last)->next) {
+ if ((*last)->options == options) {
+ reg = *last;
+ *last = reg->next;
+ free(reg);
+ return;
+ }
+ }
+}
+
+static struct plugin_option *
+find_registered_option(const char *plugin, const char *option)
+{
+ struct registered_plugin_options *reg;
+ struct plugin_option *op;
+ const char *op_plugin;
+
+ for (reg = registered_options; reg; reg = reg->next) {
+ for (op = reg->options; op->name; op++) {
+ if (op->plugin_alias)
+ op_plugin = op->plugin_alias;
+ else
+ op_plugin = op->file;
+
+ if (plugin && strcmp(plugin, op_plugin) != 0)
+ continue;
+ if (strcmp(option, op->name) != 0)
+ continue;
+
+ return op;
+ }
+ }
+
+ return NULL;
+}
+
+static void lower_case(char *str)
+{
+ if (!str)
+ return;
+ for (; *str; str++)
+ *str = tolower(*str);
+}
+
+static int update_option_value(struct plugin_option *op, const char *val)
+{
+ char *op_val;
+ int ret = 1;
+
+ if (!val) {
+ /* toggle, only if option is boolean */
+ if (op->value)
+ /* Warn? */
+ return 0;
+ op->set ^= 1;
+ return 1;
+ }
+
+ /*
+ * If the option has a value then it takes a string
+ * otherwise the option is a boolean.
+ */
+ if (op->value) {
+ op->value = (char *) val;
+ return 1;
+ }
+
+ /* Option is boolean, must be either "1", "0", "true" or "false" */
+
+ op_val = strdup(val);
+ if (!op_val)
+ die("malloc");
+ lower_case(op_val);
+
+ if (strcmp(val, "1") == 0 || strcmp(val, "true") == 0)
+ op->set = 1;
+ else if (strcmp(val, "0") == 0 || strcmp(val, "false") == 0)
+ op->set = 0;
+ else
+ /* Warn on else? */
+ ret = 0;
+ free(op_val);
+
+ return ret;
+}
+
+static int process_option(const char *plugin, const char *option, const char
*val)
+{
+ struct plugin_option *op;
+
+ op = find_registered_option(plugin, option);
+ if (!op)
+ return 0;
+
+ return update_option_value(op, val);
+}
+
+static void parse_option_name(char **option, char **plugin)
+{
+ char *p;
+
+ *plugin = NULL;
+
+ if ((p = strstr(*option, ":"))) {
+ *plugin = *option;
+ *p = '\0';
+ *option = strdup(p + 1);
+ if (!*option)
+ die("malloc");
+ }
+}
+
+/**
+ * trace_util_add_option - add an option/val pair to set plugin options
+ * @name: The name of the option (format: <plugin>:<option> or just <option>)
+ * @val: (optiona) the value for the option
+ *
+ * Modify a plugin option. If @val is given than the value of the option
+ * is set (note, some options just take a boolean, so @val must be either
+ * "1" or "0" or "true" or "false").
+ */
+void traceevent_add_option(const char *name, const char *val)
+{
+ struct trace_plugin_options *op;
+ char *option_str;
+ char *plugin;
+
+ option_str = strdup(name);
+ if (!option_str)
+ die("malloc");
+
+ parse_option_name(&option_str, &plugin);
+
+ /* If the option exists, update the val */
+ for (op = trace_plugin_options; op; op = op->next) {
+ /* Both must be NULL or not NULL */
+ if ((!plugin || !op->plugin) && plugin != op->plugin)
+ continue;
+ if (plugin && strcmp(plugin, op->plugin) != 0)
+ continue;
+ if (strcmp(op->option, option_str) != 0)
+ continue;
+
+ /* update option */
+ free(op->value);
+ if (val) {
+ op->value = strdup(val);
+ if (!op->value)
+ die("malloc");
+ } else
+ op->value = NULL;
+
+ /* plugin and option_str don't get freed at the end */
+ free(plugin);
+ free(option_str);
+
+ plugin = op->plugin;
+ option_str = op->option;
+ break;
+ }
+
+ /* If not found, create */
+ if (!op) {
+ op = malloc_or_die(sizeof(*op));
+ memset(op, 0, sizeof(*op));
+ op->next = trace_plugin_options;
+ trace_plugin_options = op;
+
+ op->plugin = plugin;
+ op->option = option_str;
+
+ if (val) {
+ op->value = strdup(val);
+ if (!op->value)
+ die("malloc");
+ }
+ }
+
+ process_option(plugin, option_str, val);
+}
diff --git a/tools/lib/traceevent/event-parse.h
b/tools/lib/traceevent/event-parse.h
index 8273c6e..3aaf668 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -110,6 +110,10 @@ struct plugin_option {
int set;
};
+void traceevent_add_options(const char *name, struct plugin_option *options);
+void traceevent_remove_options(struct plugin_option *options);
+void traceevent_add_option(const char *name, const char *val);
+
/*
* Plugin hooks that can be called:
*
--
1.7.11.7
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