/* bootchartd.c - bootchartd is commonly used to profile the boot process.
*
* Copyright 2014 Bilal Qureshi <bilal.jmi@gmail.com>
* Copyright 2014 Kyungwan Han <asura321@gmail.com>
*
* No Standard
USE_BOOTCHARTD(NEWTOY(bootchartd, 0, TOYFLAG_STAYROOT|TOYFLAG_USR|TOYFLAG_BIN))
config BOOTCHARTD
bool "bootchartd"
default n
help
usage: bootchartd {start [PROG ARGS]}|stop|init
Create /var/log/bootlog.tgz with boot chart data
start: start background logging; with PROG, run PROG,
then kill logging with USR1
stop: send USR1 to all bootchartd processes
init: start background logging; stop when getty/xdm is seen
(for init scripts)
Under PID 1: as init, then exec $bootchart_init, /init, /sbin/init
*/
#define FOR_bootchartd
#include "toys.h"
GLOBALS(
char buf[32];
long smpl_period_usec;
int proc_accounting;
int is_login;
void *head;
)
struct pid_list {
struct pid_list *next, *prev;
int pid;
};
static int push_pids_in_list(pid_t pid, char *name)
{
struct pid_list *new = xzalloc(sizeof(struct pid_list));
new->pid = pid;
dlist_add_nomalloc((void *)&TT.head, (void *)new);
return 0;
}
static void dump_data_in_file(char *fname, int wfd)
{
int rfd = open(fname, O_RDONLY);
if (rfd != -1) {
xwrite(wfd, TT.buf, strlen(TT.buf));
xsendfile(rfd, wfd);
close(rfd);
xwrite(wfd, "\n", 1);
}
}
static int dump_proc_data(FILE *fp)
{
struct dirent *pid_dir;
int login_flag = 0;
pid_t pid;
DIR *proc_dir = opendir("/proc");
fputs(TT.buf, fp);
while ((pid_dir = readdir(proc_dir))) {
char filename[64];
int fd;
if (!isdigit(pid_dir->d_name[0])) continue;
sscanf(pid_dir->d_name, "%d", &pid);
sprintf(filename, "/proc/%d/stat", pid);
if ((fd = open(filename, O_RDONLY)) != -1 ) {
char *ptr;
ssize_t len;
if ((len = readall(fd, toybuf, sizeof(toybuf)-1)) < 0) {
xclose(fd);
continue;
}
toybuf[len] = '\0';
close(fd);
fputs(toybuf, fp);
if (!TT.is_login) continue;
if ((ptr = strchr(toybuf, '('))) {
char *tmp = strchr(++ptr, ')');
if (tmp) *tmp = '\0';
}
// Checks for gdm, kdm or getty
if (((ptr[0] == 'g' || ptr[0] == 'k' || ptr[0] == 'x') && ptr[1] == 'd'
&& ptr[2] == 'm') || strstr(ptr, "getty")) login_flag = 1;
}
}
closedir(proc_dir);
fputc('\n', fp);
return login_flag;
}
static int parse_config_file(char *fname)
{
size_t len = 0;
char *line = NULL;
FILE *fp = fopen(fname, "r");
if (!fp) return 0;
for (;getline(&line, &len, fp) != -1; line = NULL) {
char *ptr = line;
while (*ptr == ' ' || *ptr == '\t') ptr++;
if (!*ptr || *ptr == '#' || *ptr == '\n') continue;
if (!strncmp(ptr, "SAMPLE_PERIOD", strlen("SAMPLE_PERIOD"))) {
double smpl_val;
if ((ptr = strchr(ptr, '='))) ptr += 1;
else continue;
sscanf(ptr, "%lf", &smpl_val);
TT.smpl_period_usec = smpl_val * 1000000;
if (TT.smpl_period_usec <= 0) TT.smpl_period_usec = 1;
}
if (!strncmp(ptr, "PROCESS_ACCOUNTING", strlen("PROCESS_ACCOUNTING"))) {
if ((ptr = strchr(ptr, '='))) ptr += 1;
else continue;
sscanf(ptr, "%s", toybuf); // string will come with double quotes.
if (!(strncmp(toybuf+1, "on", strlen("on"))) ||
!(strncmp(toybuf+1, "yes", strlen("yes")))) TT.proc_accounting = 1;
}
free(line);
}
fclose(fp);
return 1;
}
static char *create_tmp_dir()
{
char *dir_list[] = {"/tmp", "/mnt", "/boot", "/proc"}, **target = dir_list;
char *dir, dir_path[] = "/tmp/bootchart.XXXXXX";
if ((dir = mkdtemp(dir_path))) {
xchdir((dir = xstrdup(dir)));
return dir;
}
while (mount("none", *target, "tmpfs", (1<<15), "size=16m")) //MS_SILENT
if (!++target) perror_exit("can't mount tmpfs");
xchdir(*target);
if (umount2(*target, MNT_DETACH)) perror_exit("Can't unmount tmpfs");
return *target;
}
static void start_logging()
{
int proc_stat_fd = xcreate("proc_stat.log",
O_WRONLY | O_CREAT | O_TRUNC, 0644);
int proc_diskstats_fd = xcreate("proc_diskstats.log",
O_WRONLY | O_CREAT | O_TRUNC, 0644);
FILE *proc_ps_fp = xfopen("proc_ps.log", "w");
long tcnt = 60 * 1000 * 1000 / TT.smpl_period_usec;
if (tcnt <= 0) tcnt = 1;
if (TT.proc_accounting) {
int kp_fd = xcreate("kernel_procs_acct", O_WRONLY | O_CREAT | O_TRUNC,0666);
xclose(kp_fd);
acct("kernel_procs_acct");
}
memset(TT.buf, 0, sizeof(TT.buf));
while (--tcnt && !toys.signal) {
int i = 0, j = 0, fd = open("/proc/uptime", O_RDONLY);
if (fd < 0) goto wait_usec;
char *line = get_line(fd);
if (!line) goto wait_usec;
while (line[i] != ' ') {
if (line[i] == '.') {
i++;
continue;
}
TT.buf[j++] = line[i++];
}
TT.buf[j++] = '\n';
TT.buf[j] = '\0';
free(line);
close(fd);
dump_data_in_file("/proc/stat", proc_stat_fd);
dump_data_in_file("/proc/diskstats", proc_diskstats_fd);
// stop proc dumping in 2 secs if getty or gdm, kdm, xdm found
if (dump_proc_data(proc_ps_fp))
if (tcnt > 2 * 1000 * 1000 / TT.smpl_period_usec)
tcnt = 2 * 1000 * 1000 / TT.smpl_period_usec;
fflush(NULL);
wait_usec:
usleep(TT.smpl_period_usec);
}
xclose(proc_stat_fd);
xclose(proc_diskstats_fd);
fclose(proc_ps_fp);
}
static void stop_logging(char *tmp_dir, char *prog)
{
char host_name[32];
int kcmd_line_fd;
time_t t;
struct tm st;
struct utsname uts;
FILE *hdr_fp = xfopen("header", "w");
if (TT.proc_accounting) acct(NULL);
if (prog) fprintf(hdr_fp, "profile.process = %s\n", prog);
gethostname(host_name, sizeof(host_name));
time(&t);
localtime_r(&t, &st);
memset(toybuf, 0, sizeof(toybuf));
strftime(toybuf, sizeof(toybuf), "%a %b %e %H:%M:%S %Z %Y", &st);
fprintf(hdr_fp, "version = TBX_BCHARTD_VER 1.0.0\n");
fprintf(hdr_fp, "title = Boot chart for %s (%s)\n", host_name, toybuf);
if (uname(&uts) < 0) perror_exit("uname");
fprintf(hdr_fp, "system.uname = %s %s %s %s\n", uts.sysname, uts.release,
uts.version, uts.machine);
memset(toybuf, 0, sizeof(toybuf));
if ((kcmd_line_fd = open("/proc/cmdline", O_RDONLY)) != -1) {
ssize_t len;
if ((len = readall(kcmd_line_fd, toybuf, sizeof(toybuf)-1)) > 0) {
toybuf[len] = 0;
while (--len >= 0 && !toybuf[len]) continue;
for (; len > 0; len--) if (toybuf[len] < ' ') toybuf[len] = ' ';
} else *toybuf = 0;
}
fprintf(hdr_fp, "system.kernel.options = %s", toybuf);
close(kcmd_line_fd);
fclose(hdr_fp);
memset(toybuf, 0, sizeof(toybuf));
snprintf(toybuf, sizeof(toybuf), "tar -zcf /var/log/bootlog.tgz header %s *.log",
TT.proc_accounting ? "kernel_procs_acct" : "");
system(toybuf);
if (tmp_dir) {
unlink("header");
unlink("proc_stat.log");
unlink("proc_diskstats.log");
unlink("proc_ps.log");
if (TT.proc_accounting) unlink("kernel_procs_acct");
rmdir(tmp_dir);
}
}
void bootchartd_main()
{
pid_t lgr_pid, self_pid = getpid();
int bchartd_opt = 0; // 0=PID1, 1=start, 2=stop, 3=init
TT.smpl_period_usec = 200 * 1000;
TT.is_login = (self_pid == 1);
if (*toys.optargs) {
if (!strcmp("start", *toys.optargs)) bchartd_opt = 1;
else if (!strcmp("stop", *toys.optargs)) bchartd_opt = 2;
else if (!strcmp("init", *toys.optargs)) bchartd_opt = 3;
else error_exit("Unknown option '%s'", *toys.optargs);
if (bchartd_opt == 2) {
struct pid_list *temp;
char *process_name[] = {"bootchartd", NULL};
names_to_pid(process_name, push_pids_in_list);
temp = TT.head;
if (temp) temp->prev->next = 0;
for (; temp; temp = temp->next)
if (temp->pid != self_pid) kill(temp->pid, SIGUSR1);
llist_traverse(TT.head, free);
return;
}
} else if (!TT.is_login) error_exit("not PID 1");
// Execute the code below for start or init or PID1
if (!parse_config_file("bootchartd.conf"))
parse_config_file("/etc/bootchartd.conf");
memset(toybuf, 0, sizeof(toybuf));
if (!(lgr_pid = xfork())) {
char *tmp_dir = create_tmp_dir();
sigatexit(generic_signal);
raise(SIGSTOP);
if (!bchartd_opt && !getenv("PATH"))
putenv("PATH=/sbin:/usr/sbin:/bin:/usr/bin");
start_logging();
stop_logging(tmp_dir, bchartd_opt == 1 ? toys.optargs[1] : NULL);
return;
}
waitpid(lgr_pid, NULL, WUNTRACED);
kill(lgr_pid, SIGCONT);
if (!bchartd_opt) {
char *pbchart_init = getenv("bootchart_init");
if (pbchart_init) execl(pbchart_init, pbchart_init, NULL);
execl("/init", "init", (void *)0);
execl("/sbin/init", "init", (void *)0);
}
if (bchartd_opt == 1 && toys.optargs[1]) {
pid_t prog_pid;
if (!(prog_pid = xfork())) xexec(toys.optargs+1);
waitpid(prog_pid, NULL, 0);
kill(lgr_pid, SIGUSR1);
}
}