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/**
* @file daemon/oprofiled.c
* Initialisation and setup
*
* @remark Copyright 2002, 2003 OProfile authors
* @remark Read the file COPYING
*
* @author John Levon
* @author Philippe Elie
* Modified by Aravind Menon for Xen
* These modifications are:
* Copyright (C) 2005 Hewlett-Packard Co.
*/
#include "config.h"
#include "oprofiled.h"
#include "opd_printf.h"
#include "opd_events.h"
#include "opd_extended.h"
#include "op_config.h"
#include "op_version.h"
#include "op_hw_config.h"
#include "op_libiberty.h"
#include "op_file.h"
#include "op_abi.h"
#include "op_string.h"
#include "op_cpu_type.h"
#include "op_popt.h"
#include "op_lockfile.h"
#include "op_list.h"
#include "op_fileio.h"
#include <sys/types.h>
#include <sys/resource.h>
#include <stdlib.h>
#include <fcntl.h>
#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <assert.h>
#include <dirent.h>
#include <limits.h>
sig_atomic_t signal_alarm;
sig_atomic_t signal_hup;
sig_atomic_t signal_term;
sig_atomic_t signal_child;
sig_atomic_t signal_usr1;
sig_atomic_t signal_usr2;
uint op_nr_counters;
op_cpu cpu_type;
int no_event_ok;
int vsfile;
int vsamples;
int varcs;
int vmodule;
int vmisc;
int vext;
int separate_lib;
int separate_kernel;
int separate_thread;
int separate_cpu;
int no_vmlinux;
char * vmlinux;
char * kernel_range;
char * session_dir;
int no_xen;
char * xenimage;
char * xen_range;
static char * verbose;
static char * binary_name_filter;
static char * events;
static char * ext_feature;
static int showvers;
static struct oprofiled_ops * opd_ops;
extern struct oprofiled_ops opd_24_ops;
extern struct oprofiled_ops opd_26_ops;
#define OPD_IMAGE_FILTER_HASH_SIZE 32
static struct list_head images_filter[OPD_IMAGE_FILTER_HASH_SIZE];
static struct poptOption options[] = {
{ "session-dir", 0, POPT_ARG_STRING, &session_dir, 0, "place sample database in dir instead of default location", "/var/lib/oprofile", },
{ "kernel-range", 'r', POPT_ARG_STRING, &kernel_range, 0, "Kernel VMA range", "start-end", },
{ "vmlinux", 'k', POPT_ARG_STRING, &vmlinux, 0, "vmlinux kernel image", "file", },
{ "no-vmlinux", 0, POPT_ARG_NONE, &no_vmlinux, 0, "vmlinux kernel image file not available", NULL, },
{ "xen-range", 0, POPT_ARG_STRING, &xen_range, 0, "Xen VMA range", "start-end", },
{ "xen-image", 0, POPT_ARG_STRING, &xenimage, 0, "Xen image", "file", },
{ "image", 0, POPT_ARG_STRING, &binary_name_filter, 0, "image name filter", "profile these comma separated image" },
{ "separate-lib", 0, POPT_ARG_INT, &separate_lib, 0, "separate library samples for each distinct application", "[0|1]", },
{ "separate-kernel", 0, POPT_ARG_INT, &separate_kernel, 0, "separate kernel samples for each distinct application", "[0|1]", },
{ "separate-thread", 0, POPT_ARG_INT, &separate_thread, 0, "thread-profiling mode", "[0|1]" },
{ "separate-cpu", 0, POPT_ARG_INT, &separate_cpu, 0, "separate samples for each CPU", "[0|1]" },
{ "events", 'e', POPT_ARG_STRING, &events, 0, "events list", "[events]" },
{ "version", 'v', POPT_ARG_NONE, &showvers, 0, "show version", NULL, },
{ "verbose", 'V', POPT_ARG_STRING, &verbose, 0, "be verbose in log file", "all,sfile,arcs,samples,module,misc", },
{ "ext-feature", 'x', POPT_ARG_STRING, &ext_feature, 1, "enable extended feature", "<extended-feature-name>:[args]", },
POPT_AUTOHELP
{ NULL, 0, 0, NULL, 0, NULL, NULL, },
};
void opd_open_logfile(void)
{
if (open(op_log_file, O_WRONLY|O_CREAT|O_NOCTTY|O_APPEND, 0644) == -1) {
perror("oprofiled: couldn't re-open stdout: ");
exit(EXIT_FAILURE);
}
if (dup2(1, 2) == -1) {
perror("oprofiled: couldn't dup stdout to stderr: ");
exit(EXIT_FAILURE);
}
}
/**
* opd_fork - fork and return as child
*
* fork() and exit the parent with _exit().
* Failure is fatal.
*/
static void opd_fork(void)
{
switch (fork()) {
case -1:
perror("oprofiled: fork() failed: ");
exit(EXIT_FAILURE);
break;
case 0:
break;
default:
/* parent */
_exit(EXIT_SUCCESS);
break;
}
}
static void opd_go_daemon(void)
{
opd_fork();
if (chdir(op_session_dir)) {
fprintf(stderr, "oprofiled: opd_go_daemon: couldn't chdir to %s: %s",
op_session_dir, strerror(errno));
exit(EXIT_FAILURE);
}
if (setsid() < 0) {
perror("oprofiled: opd_go_daemon: couldn't setsid: ");
exit(EXIT_FAILURE);
}
opd_fork();
}
static void opd_write_abi(void)
{
char * cbuf;
cbuf = xmalloc(strlen(op_session_dir) + 5);
strcpy(cbuf, op_session_dir);
strcat(cbuf, "/abi");
op_write_abi_to_file(cbuf);
free(cbuf);
}
/**
* opd_alarm - sync files and report stats
*/
static void opd_alarm(int val __attribute__((unused)))
{
signal_alarm = 1;
}
/* re-open logfile for logrotate */
static void opd_sighup(int val __attribute__((unused)))
{
signal_hup = 1;
}
static void opd_sigterm(int val __attribute__((unused)))
{
signal_term = 1;
}
static void opd_sigchild(int val __attribute__((unused)))
{
signal_child = 1;
}
static void opd_sigusr1(int val __attribute__((unused)))
{
signal_usr1 = 1;
}
static void opd_sigusr2(int val __attribute__((unused)))
{
signal_usr2 = 1;
}
static void opd_setup_signals(void)
{
struct sigaction act;
act.sa_handler = opd_alarm;
act.sa_flags = 0;
sigemptyset(&act.sa_mask);
if (sigaction(SIGALRM, &act, NULL)) {
perror("oprofiled: install of SIGALRM handler failed: ");
exit(EXIT_FAILURE);
}
act.sa_handler = opd_sighup;
act.sa_flags = 0;
sigemptyset(&act.sa_mask);
sigaddset(&act.sa_mask, SIGALRM);
if (sigaction(SIGHUP, &act, NULL)) {
perror("oprofiled: install of SIGHUP handler failed: ");
exit(EXIT_FAILURE);
}
act.sa_handler = opd_sigterm;
act.sa_flags = 0;
sigemptyset(&act.sa_mask);
sigaddset(&act.sa_mask, SIGTERM);
if (sigaction(SIGTERM, &act, NULL)) {
perror("oprofiled: install of SIGTERM handler failed: ");
exit(EXIT_FAILURE);
}
act.sa_handler = opd_sigchild;
act.sa_flags = 0;
sigemptyset(&act.sa_mask);
sigaddset(&act.sa_mask, SIGCHLD);
if (sigaction(SIGCHLD, &act, NULL)) {
perror("oprofiled: install of SIGCHLD handler failed: ");
exit(EXIT_FAILURE);
}
act.sa_handler = opd_sigusr1;
act.sa_flags = 0;
sigemptyset(&act.sa_mask);
sigaddset(&act.sa_mask, SIGTERM);
if (sigaction(SIGUSR1, &act, NULL)) {
perror("oprofiled: install of SIGUSR1 handler failed: ");
exit(EXIT_FAILURE);
}
act.sa_handler = opd_sigusr2;
act.sa_flags = 0;
sigemptyset(&act.sa_mask);
sigaddset(&act.sa_mask, SIGTERM);
if (sigaction(SIGUSR2, &act, NULL)) {
perror("oprofiled: install of SIGUSR2 handler failed: ");
exit(EXIT_FAILURE);
}
}
struct opd_hashed_name {
char * name;
struct list_head next;
};
static void add_image_filter(char const * name)
{
size_t hash;
struct opd_hashed_name * elt = xmalloc(sizeof(struct opd_hashed_name));
elt->name = xmalloc(PATH_MAX);
if (!realpath(name, elt->name)) {
free(elt->name);
free(elt);
return;
}
hash = op_hash_string(elt->name);
verbprintf(vmisc, "Adding to image filter: \"%s\"\n", elt->name);
list_add(&elt->next, &images_filter[hash % OPD_IMAGE_FILTER_HASH_SIZE]);
}
static void opd_parse_image_filter(void)
{
size_t i;
char const * last = binary_name_filter;
char const * cur = binary_name_filter;
if (!binary_name_filter)
return;
for (i = 0; i < OPD_IMAGE_FILTER_HASH_SIZE; ++i)
list_init(&images_filter[i]);
while ((cur = strchr(last, ',')) != NULL) {
char * tmp = op_xstrndup(last, cur - last);
add_image_filter(tmp);
free(tmp);
last = cur + 1;
}
add_image_filter(last);
}
int is_image_ignored(char const * name)
{
size_t hash;
struct list_head * pos;
if (!binary_name_filter)
return 0;
hash = op_hash_string(name);
list_for_each(pos, &images_filter[hash % OPD_IMAGE_FILTER_HASH_SIZE]) {
struct opd_hashed_name * hashed_name =
list_entry(pos, struct opd_hashed_name, next);
if (!strcmp(hashed_name->name, name))
return 0;
}
return 1;
}
/** return the int in the given oprofilefs file */
int opd_read_fs_int(char const * path, char const * name, int fatal)
{
char filename[PATH_MAX + 1];
snprintf(filename, PATH_MAX, "%s/%s", path, name);
return op_read_int_from_file(filename, fatal);
}
static void opd_handle_verbose_option(char const * name)
{
if (!strcmp(name, "all")) {
vsfile = 1;
vsamples = 1;
varcs = 1;
vmodule = 1;
vmisc = 1;
vext= 1;
} else if (!strcmp(name, "sfile")) {
vsfile = 1;
} else if (!strcmp(name, "arcs")) {
varcs = 1;
} else if (!strcmp(name, "samples")) {
vsamples = 1;
} else if (!strcmp(name, "module")) {
vmodule = 1;
} else if (!strcmp(name, "misc")) {
vmisc = 1;
} else if (!strcmp(name, "ext")) {
vext= 1;
} else {
fprintf(stderr, "unknown verbose options\n");
exit(EXIT_FAILURE);
}
}
static void opd_parse_verbose(void)
{
char const * last = verbose;
char const * cur = verbose;
if (!verbose)
return;
while ((cur = strchr(last, ',')) != NULL) {
char * tmp = op_xstrndup(last, cur - last);
opd_handle_verbose_option(tmp);
free(tmp);
last = cur + 1;
}
opd_handle_verbose_option(last);
}
static void opd_options(int argc, char const * argv[])
{
poptContext optcon;
char * tmp;
optcon = op_poptGetContext(NULL, argc, argv, options, 0);
if (showvers)
show_version(argv[0]);
opd_parse_verbose();
if (separate_kernel)
separate_lib = 1;
cpu_type = op_get_cpu_type();
op_nr_counters = op_get_nr_counters(cpu_type);
if (!no_vmlinux) {
if (!vmlinux || !strcmp("", vmlinux)) {
fprintf(stderr, "oprofiled: no vmlinux specified.\n");
poptPrintHelp(optcon, stderr, 0);
exit(EXIT_FAILURE);
}
/* canonicalise vmlinux filename. fix #637805 */
tmp = xmalloc(PATH_MAX);
if (realpath(vmlinux, tmp))
vmlinux = tmp;
else
free(tmp);
if (!kernel_range || !strcmp("", kernel_range)) {
fprintf(stderr, "oprofiled: no kernel VMA range specified.\n");
poptPrintHelp(optcon, stderr, 0);
exit(EXIT_FAILURE);
}
}
if(opd_ext_initialize(ext_feature) != EXIT_SUCCESS)
exit(EXIT_FAILURE);
if (events == NULL && no_event_ok == 0) {
fprintf(stderr, "oprofiled: no events specified.\n");
poptPrintHelp(optcon, stderr, 0);
exit(EXIT_FAILURE);
}
if (!xenimage || !strcmp("", xenimage)) {
no_xen = 1;
} else {
no_xen = 0;
/* canonicalise xen image filename. */
tmp = xmalloc(PATH_MAX);
if (realpath(xenimage, tmp))
xenimage = tmp;
else
free(tmp);
if (!xen_range || !strcmp("", xen_range)) {
fprintf(stderr, "oprofiled: no Xen VMA range specified.\n");
poptPrintHelp(optcon, stderr, 0);
exit(EXIT_FAILURE);
}
}
if (events != NULL)
opd_parse_events(events);
opd_parse_image_filter();
poptFreeContext(optcon);
}
/* determine what kernel we're running and which daemon
* to use
*/
static struct oprofiled_ops * get_ops(void)
{
switch (op_get_interface()) {
#ifndef ANDROID
case OP_INTERFACE_24:
printf("Using 2.4 OProfile kernel interface.\n");
return &opd_24_ops;
#endif
case OP_INTERFACE_26:
printf("Using 2.6+ OProfile kernel interface.\n");
return &opd_26_ops;
default:
break;
}
fprintf(stderr, "Couldn't determine kernel version.\n");
exit(EXIT_FAILURE);
return NULL;
}
int main(int argc, char const * argv[])
{
int err;
struct rlimit rlim = { 2048, 2048 };
opd_options(argc, argv);
init_op_config_dirs(session_dir);
opd_setup_signals();
err = setrlimit(RLIMIT_NOFILE, &rlim);
if (err)
perror("warning: could not set RLIMIT_NOFILE to 2048: ");
opd_write_abi();
opd_ops = get_ops();
opd_ops->init();
opd_go_daemon();
/* clean up every 10 minutes */
alarm(60 * 10);
if (op_write_lock_file(op_lock_file)) {
fprintf(stderr, "oprofiled: could not create lock file %s\n",
op_lock_file);
exit(EXIT_FAILURE);
}
opd_ops->start();
opd_ops->exit();
return 0;
}
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