linux/tools/perf/builtin-help.c

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/*
* builtin-help.c
*
* Builtin help command
*/
#include "perf.h"
#include "util/cache.h"
#include "builtin.h"
#include <subcmd/exec-cmd.h>
#include "common-cmds.h"
#include <subcmd/parse-options.h>
#include <subcmd/run-command.h>
#include <subcmd/help.h>
#include "util/debug.h"
static struct man_viewer_list {
struct man_viewer_list *next;
char name[FLEX_ARRAY];
} *man_viewer_list;
static struct man_viewer_info_list {
struct man_viewer_info_list *next;
const char *info;
char name[FLEX_ARRAY];
} *man_viewer_info_list;
enum help_format {
HELP_FORMAT_NONE,
HELP_FORMAT_MAN,
HELP_FORMAT_INFO,
HELP_FORMAT_WEB,
};
static enum help_format parse_help_format(const char *format)
{
if (!strcmp(format, "man"))
return HELP_FORMAT_MAN;
if (!strcmp(format, "info"))
return HELP_FORMAT_INFO;
if (!strcmp(format, "web") || !strcmp(format, "html"))
return HELP_FORMAT_WEB;
pr_err("unrecognized help format '%s'", format);
return HELP_FORMAT_NONE;
}
static const char *get_man_viewer_info(const char *name)
{
struct man_viewer_info_list *viewer;
for (viewer = man_viewer_info_list; viewer; viewer = viewer->next) {
if (!strcasecmp(name, viewer->name))
return viewer->info;
}
return NULL;
}
static int check_emacsclient_version(void)
{
struct strbuf buffer = STRBUF_INIT;
struct child_process ec_process;
const char *argv_ec[] = { "emacsclient", "--version", NULL };
int version;
/* emacsclient prints its version number on stderr */
memset(&ec_process, 0, sizeof(ec_process));
ec_process.argv = argv_ec;
ec_process.err = -1;
ec_process.stdout_to_stderr = 1;
if (start_command(&ec_process)) {
fprintf(stderr, "Failed to start emacsclient.\n");
return -1;
}
strbuf_read(&buffer, ec_process.err, 20);
close(ec_process.err);
/*
* Don't bother checking return value, because "emacsclient --version"
* seems to always exits with code 1.
*/
finish_command(&ec_process);
if (prefixcmp(buffer.buf, "emacsclient")) {
fprintf(stderr, "Failed to parse emacsclient version.\n");
strbuf_release(&buffer);
return -1;
}
version = atoi(buffer.buf + strlen("emacsclient"));
if (version < 22) {
fprintf(stderr,
"emacsclient version '%d' too old (< 22).\n",
version);
strbuf_release(&buffer);
return -1;
}
strbuf_release(&buffer);
return 0;
}
static void exec_woman_emacs(const char *path, const char *page)
{
char sbuf[STRERR_BUFSIZE];
if (!check_emacsclient_version()) {
/* This works only with emacsclient version >= 22. */
char *man_page;
if (!path)
path = "emacsclient";
if (asprintf(&man_page, "(woman \"%s\")", page) > 0) {
execlp(path, "emacsclient", "-e", man_page, NULL);
free(man_page);
}
warning("failed to exec '%s': %s", path,
strerror_r(errno, sbuf, sizeof(sbuf)));
}
}
static void exec_man_konqueror(const char *path, const char *page)
{
const char *display = getenv("DISPLAY");
if (display && *display) {
char *man_page;
const char *filename = "kfmclient";
char sbuf[STRERR_BUFSIZE];
/* It's simpler to launch konqueror using kfmclient. */
if (path) {
const char *file = strrchr(path, '/');
if (file && !strcmp(file + 1, "konqueror")) {
char *new = strdup(path);
char *dest = strrchr(new, '/');
/* strlen("konqueror") == strlen("kfmclient") */
strcpy(dest + 1, "kfmclient");
path = new;
}
if (file)
filename = file;
} else
path = "kfmclient";
if (asprintf(&man_page, "man:%s(1)", page) > 0) {
execlp(path, filename, "newTab", man_page, NULL);
free(man_page);
}
warning("failed to exec '%s': %s", path,
strerror_r(errno, sbuf, sizeof(sbuf)));
}
}
static void exec_man_man(const char *path, const char *page)
{
char sbuf[STRERR_BUFSIZE];
if (!path)
path = "man";
execlp(path, "man", page, NULL);
warning("failed to exec '%s': %s", path,
strerror_r(errno, sbuf, sizeof(sbuf)));
}
static void exec_man_cmd(const char *cmd, const char *page)
{
char sbuf[STRERR_BUFSIZE];
char *shell_cmd;
if (asprintf(&shell_cmd, "%s %s", cmd, page) > 0) {
execl("/bin/sh", "sh", "-c", shell_cmd, NULL);
free(shell_cmd);
}
warning("failed to exec '%s': %s", cmd,
strerror_r(errno, sbuf, sizeof(sbuf)));
}
static void add_man_viewer(const char *name)
{
struct man_viewer_list **p = &man_viewer_list;
size_t len = strlen(name);
while (*p)
p = &((*p)->next);
*p = zalloc(sizeof(**p) + len + 1);
strncpy((*p)->name, name, len);
}
static int supported_man_viewer(const char *name, size_t len)
{
return (!strncasecmp("man", name, len) ||
!strncasecmp("woman", name, len) ||
!strncasecmp("konqueror", name, len));
}
static void do_add_man_viewer_info(const char *name,
size_t len,
const char *value)
{
struct man_viewer_info_list *new = zalloc(sizeof(*new) + len + 1);
strncpy(new->name, name, len);
new->info = strdup(value);
new->next = man_viewer_info_list;
man_viewer_info_list = new;
}
static int add_man_viewer_path(const char *name,
size_t len,
const char *value)
{
if (supported_man_viewer(name, len))
do_add_man_viewer_info(name, len, value);
else
warning("'%s': path for unsupported man viewer.\n"
"Please consider using 'man.<tool>.cmd' instead.",
name);
return 0;
}
static int add_man_viewer_cmd(const char *name,
size_t len,
const char *value)
{
if (supported_man_viewer(name, len))
warning("'%s': cmd for supported man viewer.\n"
"Please consider using 'man.<tool>.path' instead.",
name);
else
do_add_man_viewer_info(name, len, value);
return 0;
}
static int add_man_viewer_info(const char *var, const char *value)
{
const char *name = var + 4;
const char *subkey = strrchr(name, '.');
if (!subkey)
return error("Config with no key for man viewer: %s", name);
if (!strcmp(subkey, ".path")) {
if (!value)
return config_error_nonbool(var);
return add_man_viewer_path(name, subkey - name, value);
}
if (!strcmp(subkey, ".cmd")) {
if (!value)
return config_error_nonbool(var);
return add_man_viewer_cmd(name, subkey - name, value);
}
warning("'%s': unsupported man viewer sub key.", subkey);
return 0;
}
static int perf_help_config(const char *var, const char *value, void *cb)
{
enum help_format *help_formatp = cb;
if (!strcmp(var, "help.format")) {
if (!value)
return config_error_nonbool(var);
*help_formatp = parse_help_format(value);
if (*help_formatp == HELP_FORMAT_NONE)
return -1;
return 0;
}
if (!strcmp(var, "man.viewer")) {
if (!value)
return config_error_nonbool(var);
add_man_viewer(value);
return 0;
}
if (!prefixcmp(var, "man."))
return add_man_viewer_info(var, value);
return 0;
}
static struct cmdnames main_cmds, other_cmds;
void list_common_cmds_help(void)
{
unsigned int i, longest = 0;
for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
if (longest < strlen(common_cmds[i].name))
longest = strlen(common_cmds[i].name);
}
puts(" The most commonly used perf commands are:");
for (i = 0; i < ARRAY_SIZE(common_cmds); i++) {
printf(" %-*s ", longest, common_cmds[i].name);
puts(common_cmds[i].help);
}
}
static int is_perf_command(const char *s)
{
return is_in_cmdlist(&main_cmds, s) ||
is_in_cmdlist(&other_cmds, s);
}
static const char *cmd_to_page(const char *perf_cmd)
{
char *s;
if (!perf_cmd)
return "perf";
else if (!prefixcmp(perf_cmd, "perf"))
return perf_cmd;
return asprintf(&s, "perf-%s", perf_cmd) < 0 ? NULL : s;
}
static void setup_man_path(void)
{
char *new_path;
const char *old_path = getenv("MANPATH");
/* We should always put ':' after our path. If there is no
* old_path, the ':' at the end will let 'man' to try
* system-wide paths after ours to find the manual page. If
* there is old_path, we need ':' as delimiter. */
if (asprintf(&new_path, "%s:%s", system_path(PERF_MAN_PATH), old_path ?: "") > 0) {
setenv("MANPATH", new_path, 1);
free(new_path);
} else {
error("Unable to setup man path");
}
}
static void exec_viewer(const char *name, const char *page)
{
const char *info = get_man_viewer_info(name);
if (!strcasecmp(name, "man"))
exec_man_man(info, page);
else if (!strcasecmp(name, "woman"))
exec_woman_emacs(info, page);
else if (!strcasecmp(name, "konqueror"))
exec_man_konqueror(info, page);
else if (info)
exec_man_cmd(info, page);
else
warning("'%s': unknown man viewer.", name);
}
static int show_man_page(const char *perf_cmd)
{
struct man_viewer_list *viewer;
const char *page = cmd_to_page(perf_cmd);
const char *fallback = getenv("PERF_MAN_VIEWER");
setup_man_path();
for (viewer = man_viewer_list; viewer; viewer = viewer->next)
exec_viewer(viewer->name, page); /* will return when unable */
if (fallback)
exec_viewer(fallback, page);
exec_viewer("man", page);
pr_err("no man viewer handled the request");
return -1;
}
static int show_info_page(const char *perf_cmd)
{
const char *page = cmd_to_page(perf_cmd);
setenv("INFOPATH", system_path(PERF_INFO_PATH), 1);
execlp("info", "info", "perfman", page, NULL);
return -1;
}
static int get_html_page_path(char **page_path, const char *page)
{
struct stat st;
const char *html_path = system_path(PERF_HTML_PATH);
/* Check that we have a perf documentation directory. */
if (stat(mkpath("%s/perf.html", html_path), &st)
|| !S_ISREG(st.st_mode)) {
pr_err("'%s': not a documentation directory.", html_path);
return -1;
}
return asprintf(page_path, "%s/%s.html", html_path, page);
}
/*
* If open_html is not defined in a platform-specific way (see for
* example compat/mingw.h), we use the script web--browse to display
* HTML.
*/
#ifndef open_html
static void open_html(const char *path)
{
execl_cmd("web--browse", "-c", "help.browser", path, NULL);
}
#endif
static int show_html_page(const char *perf_cmd)
{
const char *page = cmd_to_page(perf_cmd);
char *page_path; /* it leaks but we exec bellow */
if (get_html_page_path(&page_path, page) < 0)
return -1;
open_html(page_path);
return 0;
}
perf tools: Use __maybe_used for unused variables perf defines both __used and __unused variables to use for marking unused variables. The variable __used is defined to __attribute__((__unused__)), which contradicts the kernel definition to __attribute__((__used__)) for new gcc versions. On Android, __used is also defined in system headers and this leads to warnings like: warning: '__used__' attribute ignored __unused is not defined in the kernel and is not a standard definition. If __unused is included everywhere instead of __used, this leads to conflicts with glibc headers, since glibc has a variables with this name in its headers. The best approach is to use __maybe_unused, the definition used in the kernel for __attribute__((unused)). In this way there is only one definition in perf sources (instead of 2 definitions that point to the same thing: __used and __unused) and it works on both Linux and Android. This patch simply replaces all instances of __used and __unused with __maybe_unused. Signed-off-by: Irina Tirdea <irina.tirdea@intel.com> Acked-by: Pekka Enberg <penberg@kernel.org> Cc: David Ahern <dsahern@gmail.com> Cc: Ingo Molnar <mingo@redhat.com> Cc: Namhyung Kim <namhyung.kim@lge.com> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Steven Rostedt <rostedt@goodmis.org> Link: http://lkml.kernel.org/r/1347315303-29906-7-git-send-email-irina.tirdea@intel.com [ committer note: fixed up conflict with a116e05 in builtin-sched.c ] Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2012-09-10 22:15:03 +00:00
int cmd_help(int argc, const char **argv, const char *prefix __maybe_unused)
{
bool show_all = false;
enum help_format help_format = HELP_FORMAT_MAN;
struct option builtin_help_options[] = {
OPT_BOOLEAN('a', "all", &show_all, "print all available commands"),
OPT_SET_UINT('m', "man", &help_format, "show man page", HELP_FORMAT_MAN),
OPT_SET_UINT('w', "web", &help_format, "show manual in web browser",
HELP_FORMAT_WEB),
OPT_SET_UINT('i', "info", &help_format, "show info page",
HELP_FORMAT_INFO),
OPT_END(),
};
const char * const builtin_help_subcommands[] = {
"buildid-cache", "buildid-list", "diff", "evlist", "help", "list",
"record", "report", "bench", "stat", "timechart", "top", "annotate",
"script", "sched", "kmem", "lock", "kvm", "test", "inject", "mem", "data",
#ifdef HAVE_LIBELF_SUPPORT
"probe",
#endif
#ifdef HAVE_LIBAUDIT_SUPPORT
"trace",
#endif
NULL };
const char *builtin_help_usage[] = {
"perf help [--all] [--man|--web|--info] [command]",
NULL
};
const char *alias;
int rc = 0;
load_command_list("perf-", &main_cmds, &other_cmds);
perf_config(perf_help_config, &help_format);
argc = parse_options_subcommand(argc, argv, builtin_help_options,
builtin_help_subcommands, builtin_help_usage, 0);
if (show_all) {
printf("\n Usage: %s\n\n", perf_usage_string);
list_commands("perf commands", &main_cmds, &other_cmds);
printf(" %s\n\n", perf_more_info_string);
return 0;
}
if (!argv[0]) {
printf("\n usage: %s\n\n", perf_usage_string);
list_common_cmds_help();
printf("\n %s\n\n", perf_more_info_string);
return 0;
}
alias = alias_lookup(argv[0]);
if (alias && !is_perf_command(argv[0])) {
printf("`perf %s' is aliased to `%s'\n", argv[0], alias);
return 0;
}
switch (help_format) {
case HELP_FORMAT_MAN:
rc = show_man_page(argv[0]);
break;
case HELP_FORMAT_INFO:
rc = show_info_page(argv[0]);
break;
case HELP_FORMAT_WEB:
rc = show_html_page(argv[0]);
break;
case HELP_FORMAT_NONE:
/* fall-through */
perf: Enable more compiler warnings Related to a shadowed variable bug fix Valdis Kletnieks noticed that perf does not get built with -Wshadow, which could have helped us avoid the bug. So enable -Wshadow and also enable the following warnings on perf builds, in addition to the already enabled -Wall -Wextra -std=gnu99 warnings: -Wcast-align -Wformat=2 -Wshadow -Winit-self -Wpacked -Wredundant-decls -Wstack-protector -Wstrict-aliasing=3 -Wswitch-default -Wswitch-enum -Wno-system-headers -Wundef -Wvolatile-register-var -Wwrite-strings -Wbad-function-cast -Wmissing-declarations -Wmissing-prototypes -Wnested-externs -Wold-style-definition -Wstrict-prototypes -Wdeclaration-after-statement And change/fix the perf code to build cleanly under GCC 4.3.2. The list of warnings enablement is rather arbitrary: it's based on my (quick) reading of the GCC manpages and trying them on perf. I categorized the warnings based on individually enabling them and looking whether they trigger something in the perf build. If i liked those warnings (i.e. if they trigger for something that arguably could be improved) i enabled the warning. If the warnings seemed to come from language laywers spamming the build with tons of nuisance warnings i generally kept them off. Most of the sign conversion related warnings were in this category. (A second patch enabling some of the sign warnings might be welcome - sign bugs can be nasty.) I also kept warnings that seem to make sense from their manpage description and which produced no actual warnings on our code base. These warnings might still be turned off if they end up being a nuisance. I also left out a few warnings that are not supported in older compilers. [ Note that these changes might break the build on older compilers i did not test, or on non-x86 architectures that produce different warnings, so more testing would be welcome. ] Reported-by: Valdis.Kletnieks@vt.edu Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: Mike Galbraith <efault@gmx.de> Cc: Paul Mackerras <paulus@samba.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
2009-08-15 10:26:57 +00:00
default:
rc = -1;
break;
}
return rc;
}