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posix-timer: Parse proc /proc/<pid>/timers and save info in list

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Signed-off-by: Pavel Tikhomirov <snorcht@gmail.com>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Pavel Tikhomirov
2013-06-27 23:32:20 +04:00
committed by Pavel Emelyanov
parent 2752cf9bf7
commit d992960fa7
3 changed files with 142 additions and 0 deletions
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121
proc_parse.c
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@@ -1158,3 +1158,124 @@ err:
fclose(fl_locks);
return ret;
}
int parse_posix_timers(pid_t pid, struct proc_posix_timers_stat *args)
{
int i;
int ret = 0;
int get = 0;
int pid_t;
char path[128];
FILE * file;
char * line1 = NULL;
char * line2 = NULL;
char * line3 = NULL;
char * line4 = NULL;
size_t len1 = 0;
size_t len2 = 0;
size_t len3 = 0;
size_t len4 = 0;
char * siginfo;
char siginfo_tmp[20];
char sigpid[7];
char tidpid[4];
char str_name[10];
struct proc_posix_timer *timer = NULL;
INIT_LIST_HEAD(&args->timers);
args->timer_n = 0;
sprintf(path, "/proc/%d/timers", pid);
file = fopen(path, "r");
if (file == NULL) {
pr_perror("Can't open posix timers file!");
ret = -1;
goto end_posix;
}
while (1) {
get = getline(&line1, &len1, file);
if (get == -1)
goto end_posix;
get = getline(&line2, &len2, file);
if (get == -1)
goto end_posix;
get = getline(&line3, &len3, file);
if (get == -1)
goto end_posix;
get = getline(&line4, &len4, file);
if (get == -1)
goto end_posix;
timer = xzalloc(sizeof(struct proc_posix_timer));
ret = sscanf(line1, "%s %d", str_name, &timer->spt.it_id);
if (ret != 2 || str_name[0] != 'I')
goto parse_err_posix;
ret = sscanf(line2, "%s %d%s", str_name, &timer->spt.si_signo, siginfo_tmp);
if (ret != 3 || str_name[0] != 's')
goto parse_err_posix;
siginfo=&siginfo_tmp[1];
ret = sscanf(siginfo, "%p", &timer->spt.sival_ptr);
if (ret != 1)
goto parse_err_posix;
for (i = 0; i<len3; i++) {
if (line3[i] == '/' || line3[i] == '.') {
line3[i] = ' ';
}
}
ret = sscanf(line3, "%s %s %s %d", str_name, sigpid, tidpid, &pid_t);
if (ret != 4 || str_name[0] != 'n')
goto parse_err_posix;
if ( tidpid[0] == 't') {
timer->spt.it_sigev_notify = SIGEV_THREAD_ID;
} else {
switch (sigpid[0]) {
case 's' :
timer->spt.it_sigev_notify = SIGEV_SIGNAL;
break;
case 't' :
timer->spt.it_sigev_notify = SIGEV_THREAD;
break;
default :
timer->spt.it_sigev_notify = SIGEV_NONE;
break;
}
}
ret = sscanf(line4, "%s %d", str_name, &timer->spt.clock_id);
if (ret != 2 || str_name[0] != 'C')
goto parse_err_posix;
list_add(&timer->list, &args->timers);
timer = NULL;
args->timer_n++;
}
parse_err_posix:
while (!list_empty(&args->timers)) {
timer = list_first_entry(&args->timers, struct proc_posix_timer, list);
list_del(&timer->list);
xfree(timer);
}
pr_perror("Parse error in posix timers proc file!");
ret = -1;
end_posix:
if (ferror(file)) {
ret = -1;
pr_perror("getline");
}
if (line1)
free(line1);
if (line2)
free(line2);
if (line3)
free(line3);
if (file != NULL)
fclose(file);
return ret;
}