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Subject[PATCH 4/4] perf tools: Introduce usage_with_options_msg()
Date
Now usage_with_options() setup a pager before printing message so normal
printf() or pr_err() will not be shown. The usage_with_options_msg()
can be used to print some help message before usage strings.

Cc: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Namhyung Kim <namhyung@kernel.org>
---
tools/perf/builtin-evlist.c | 4 ++--
tools/perf/builtin-probe.c | 20 ++++++++++++--------
tools/perf/builtin-record.c | 11 ++++++-----
tools/perf/builtin-sched.c | 4 ++--
tools/perf/builtin-script.c | 8 ++++----
tools/perf/util/parse-options.c | 15 +++++++++++++++
tools/perf/util/parse-options.h | 4 ++++
tools/perf/util/strbuf.c | 22 +++++++++++++++-------
tools/perf/util/strbuf.h | 2 ++
9 files changed, 62 insertions(+), 28 deletions(-)

diff --git a/tools/perf/builtin-evlist.c b/tools/perf/builtin-evlist.c
index 695ec5a50cf2..f4d62510acbb 100644
--- a/tools/perf/builtin-evlist.c
+++ b/tools/perf/builtin-evlist.c
@@ -61,8 +61,8 @@ int cmd_evlist(int argc, const char **argv, const char *prefix __maybe_unused)
usage_with_options(evlist_usage, options);

if (details.event_group && (details.verbose || details.freq)) {
- pr_err("--group option is not compatible with other options\n");
- usage_with_options(evlist_usage, options);
+ usage_with_options_msg(evlist_usage, options,
+ "--group option is not compatible with other options\n");
}

return __cmd_evlist(input_name, &details);
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 530c3a28a58c..132afc97676c 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -528,12 +528,12 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
PARSE_OPT_STOP_AT_NON_OPTION);
if (argc > 0) {
if (strcmp(argv[0], "-") == 0) {
- pr_warning(" Error: '-' is not supported.\n");
- usage_with_options(probe_usage, options);
+ usage_with_options_msg(probe_usage, options,
+ "'-' is not supported.\n");
}
if (params.command && params.command != 'a') {
- pr_warning(" Error: another command except --add is set.\n");
- usage_with_options(probe_usage, options);
+ usage_with_options_msg(probe_usage, options,
+ "another command except --add is set.\n");
}
ret = parse_probe_event_argv(argc, argv);
if (ret < 0) {
@@ -562,8 +562,10 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
switch (params.command) {
case 'l':
if (params.uprobes) {
- pr_warning(" Error: Don't use --list with --exec.\n");
- usage_with_options(probe_usage, options);
+ pr_err(" Error: Don't use --list with --exec.\n");
+ parse_options_usage(probe_usage, options, "l", true);
+ parse_options_usage(NULL, options, "x", true);
+ return -EINVAL;
}
ret = show_perf_probe_events(params.filter);
if (ret < 0)
@@ -603,8 +605,10 @@ __cmd_probe(int argc, const char **argv, const char *prefix __maybe_unused)
case 'a':
/* Ensure the last given target is used */
if (params.target && !params.target_used) {
- pr_warning(" Error: -x/-m must follow the probe definitions.\n");
- usage_with_options(probe_usage, options);
+ pr_err(" Error: -x/-m must follow the probe definitions.\n");
+ parse_options_usage(probe_usage, options, "m", true);
+ parse_options_usage(NULL, options, "x", true);
+ return -EINVAL;
}

ret = perf_add_probe_events(params.events, params.nevents);
diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
index 2740d7a82ae8..de02267c73d8 100644
--- a/tools/perf/builtin-record.c
+++ b/tools/perf/builtin-record.c
@@ -1135,14 +1135,15 @@ int cmd_record(int argc, const char **argv, const char *prefix __maybe_unused)
usage_with_options(record_usage, record_options);

if (nr_cgroups && !rec->opts.target.system_wide) {
- ui__error("cgroup monitoring only available in"
- " system-wide mode\n");
- usage_with_options(record_usage, record_options);
+ usage_with_options_msg(record_usage, record_options,
+ "cgroup monitoring only available in system-wide mode");
+
}
if (rec->opts.record_switch_events &&
!perf_can_record_switch_events()) {
- ui__error("kernel does not support recording context switch events (--switch-events option)\n");
- usage_with_options(record_usage, record_options);
+ ui__error("kernel does not support recording context switch events\n");
+ parse_options_usage(record_usage, record_options, "switch-events", 0);
+ return -EINVAL;
}

if (!rec->itr) {
diff --git a/tools/perf/builtin-sched.c b/tools/perf/builtin-sched.c
index 33962612a5e9..0ee6d900e100 100644
--- a/tools/perf/builtin-sched.c
+++ b/tools/perf/builtin-sched.c
@@ -1728,8 +1728,8 @@ static void setup_sorting(struct perf_sched *sched, const struct option *options
for (tok = strtok_r(str, ", ", &tmp);
tok; tok = strtok_r(NULL, ", ", &tmp)) {
if (sort_dimension__add(tok, &sched->sort_list) < 0) {
- error("Unknown --sort key: `%s'", tok);
- usage_with_options(usage_msg, options);
+ usage_with_options_msg(usage_msg, options,
+ "Unknown --sort key: `%s'", tok);
}
}

diff --git a/tools/perf/builtin-script.c b/tools/perf/builtin-script.c
index 2653c0273b89..278acb22f029 100644
--- a/tools/perf/builtin-script.c
+++ b/tools/perf/builtin-script.c
@@ -1767,9 +1767,9 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
rep_script_path = get_script_path(argv[0], REPORT_SUFFIX);

if (!rec_script_path && !rep_script_path) {
- fprintf(stderr, " Couldn't find script %s\n\n See perf"
+ usage_with_options_msg(script_usage, options,
+ "Couldn't find script `%s'\n\n See perf"
" script -l for available scripts.\n", argv[0]);
- usage_with_options(script_usage, options);
}

if (is_top_script(argv[0])) {
@@ -1780,10 +1780,10 @@ int cmd_script(int argc, const char **argv, const char *prefix __maybe_unused)
rep_args = has_required_arg(rep_script_path);
rec_args = (argc - 1) - rep_args;
if (rec_args < 0) {
- fprintf(stderr, " %s script requires options."
+ usage_with_options_msg(script_usage, options,
+ "`%s' script requires options."
"\n\n See perf script -l for available "
"scripts and options.\n", argv[0]);
- usage_with_options(script_usage, options);
}
}

diff --git a/tools/perf/util/parse-options.c b/tools/perf/util/parse-options.c
index eeeed98eb26d..230e771407a3 100644
--- a/tools/perf/util/parse-options.c
+++ b/tools/perf/util/parse-options.c
@@ -760,6 +760,21 @@ void usage_with_options(const char * const *usagestr,
exit(129);
}

+void usage_with_options_msg(const char * const *usagestr,
+ const struct option *opts, const char *fmt, ...)
+{
+ va_list ap;
+
+ exit_browser(false);
+
+ va_start(ap, fmt);
+ strbuf_addv(&error_buf, fmt, ap);
+ va_end(ap);
+
+ usage_with_options_internal(usagestr, opts, 0, NULL);
+ exit(129);
+}
+
int parse_options_usage(const char * const *usagestr,
const struct option *opts,
const char *optstr, bool short_opt)
diff --git a/tools/perf/util/parse-options.h b/tools/perf/util/parse-options.h
index 182c86099330..a8e407bc251e 100644
--- a/tools/perf/util/parse-options.h
+++ b/tools/perf/util/parse-options.h
@@ -161,6 +161,10 @@ extern int parse_options_subcommand(int argc, const char **argv,

extern NORETURN void usage_with_options(const char * const *usagestr,
const struct option *options);
+extern NORETURN __attribute__((format(printf,3,4)))
+void usage_with_options_msg(const char * const *usagestr,
+ const struct option *options,
+ const char *fmt, ...);

/*----- incremantal advanced APIs -----*/

diff --git a/tools/perf/util/strbuf.c b/tools/perf/util/strbuf.c
index 4abe23550c73..25671fa16618 100644
--- a/tools/perf/util/strbuf.c
+++ b/tools/perf/util/strbuf.c
@@ -82,23 +82,22 @@ void strbuf_add(struct strbuf *sb, const void *data, size_t len)
strbuf_setlen(sb, sb->len + len);
}

-void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
+void strbuf_addv(struct strbuf *sb, const char *fmt, va_list ap)
{
int len;
- va_list ap;
+ va_list ap_saved;

if (!strbuf_avail(sb))
strbuf_grow(sb, 64);
- va_start(ap, fmt);
+
+ va_copy(ap_saved, ap);
len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
- va_end(ap);
if (len < 0)
die("your vsnprintf is broken");
if (len > strbuf_avail(sb)) {
strbuf_grow(sb, len);
- va_start(ap, fmt);
- len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap);
- va_end(ap);
+ len = vsnprintf(sb->buf + sb->len, sb->alloc - sb->len, fmt, ap_saved);
+ va_end(ap_saved);
if (len > strbuf_avail(sb)) {
die("this should not happen, your vsnprintf is broken");
}
@@ -106,6 +105,15 @@ void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
strbuf_setlen(sb, sb->len + len);
}

+void strbuf_addf(struct strbuf *sb, const char *fmt, ...)
+{
+ va_list ap;
+
+ va_start(ap, fmt);
+ strbuf_addv(sb, fmt, ap);
+ va_end(ap);
+}
+
ssize_t strbuf_read(struct strbuf *sb, int fd, ssize_t hint)
{
size_t oldlen = sb->len;
diff --git a/tools/perf/util/strbuf.h b/tools/perf/util/strbuf.h
index 436ac319f6c7..529f2f035249 100644
--- a/tools/perf/util/strbuf.h
+++ b/tools/perf/util/strbuf.h
@@ -39,6 +39,7 @@
*/

#include <assert.h>
+#include <stdarg.h>

extern char strbuf_slopbuf[];
struct strbuf {
@@ -85,6 +86,7 @@ static inline void strbuf_addstr(struct strbuf *sb, const char *s) {

__attribute__((format(printf,2,3)))
extern void strbuf_addf(struct strbuf *sb, const char *fmt, ...);
+extern void strbuf_addv(struct strbuf *sb, const char *fmt, va_list ap);

/* XXX: if read fails, any partial read is undone */
extern ssize_t strbuf_read(struct strbuf *, int fd, ssize_t hint);
--
2.6.0


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