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crtools: Parse /proc/pid/stat in a more readable way

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We will later need other fields of this file, so let's parse it right
now in a way, that allows to easily get new fields.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
This commit is contained in:
Pavel Emelyanov
2012-01-13 20:54:08 +04:00
committed by Cyrill Gorcunov
parent 12d4c85410
commit 3202d72f85
3 changed files with 134 additions and 86 deletions
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102
cr-dump.c
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@@ -434,6 +434,8 @@ err:
#define assign_reg(dst, src, e) dst.e = (__typeof__(dst.e))src.e
#define assign_array(dst, src, e) memcpy(&dst.e, &src.e, sizeof(dst.e))
static struct proc_pid_stat pps_buf;
static int get_task_stat(pid_t pid, int pid_dir, u8 *comm, u32 *flags,
u64 *start_code, u64 *end_code,
u64 *start_data, u64 *end_data,
@@ -441,101 +443,29 @@ static int get_task_stat(pid_t pid, int pid_dir, u8 *comm, u32 *flags,
u64 *task_sigset)
{
FILE *file = NULL;
char *tok1, *tok2;
int i, ret = -1;
int ret;
/*
* NOTE: Be careful, /proc/$pid/stat has a parasite
* '0' symbol at argument 20 in format string.
*/
file = fopen_proc(pid_dir, "stat");
if (!file) {
pr_perror("Can't open %d stat\n", pid);
ret = parse_pid_stat(pid, pid_dir, &pps_buf);
if (ret < 0)
goto err;
}
if (!fgets(loc_buf, sizeof(loc_buf), file)) {
perror("Can't read task stat");
goto err;
}
strcpy((char *)comm, pps_buf.comm);
*flags = pps_buf.flags;
*start_code = pps_buf.start_code;
*end_code = pps_buf.end_code;
*start_data = pps_buf.start_data;
*end_data = pps_buf.end_data;
*start_stack = pps_buf.start_stack;
*start_brk = pps_buf.start_brk;
tok1 = strtok(loc_buf, "(");
tok2 = strtok(NULL, ")");
if ((long)tok1 & (long)tok2) {
strncpy((char *)comm, tok2, TASK_COMM_LEN);
ret = 0;
} else {
printf("Unable to parse task stat\n");
ret = -1;
}
if (!ret) {
ret = -1;
for (i = 0; i < 7; i++) {
tok1 = strtok(NULL, " \n\t");
if (!tok1)
goto err_corrupted;
}
*flags = atoi(tok1);
ret = 0;
}
if (!ret) {
ret = -1;
for (i = 0; i < 16; i++) {
tok1 = strtok(NULL, " \n\t");
if (!tok1)
goto err_corrupted;
}
tok1 = strtok(NULL, " \n\t");
if (!tok1)
goto err_corrupted;
*start_code = atol(tok1);
tok1 = strtok(NULL, " \n\t");
if (!tok1)
goto err_corrupted;
*end_code = atol(tok1);
ret = 0;
tok1 = strtok(NULL, " \n\t");
if (!tok1)
goto err_corrupted;
*start_stack = atol(tok1);
ret = 0;
}
if (!ret) {
ret = -1;
for (i = 0; i < 16; i++) {
tok1 = strtok(NULL, " \n\t");
if (!tok1)
goto err_corrupted;
}
tok1 = strtok(NULL, " \n\t");
if (!tok1)
goto err_corrupted;
*start_data = atol(tok1);
tok1 = strtok(NULL, " \n\t");
if (!tok1)
goto err_corrupted;
*end_data = atol(tok1);
tok1 = strtok(NULL, " \n\t");
if (!tok1)
goto err_corrupted;
*start_brk = atol(tok1);
ret = 0;
if (*start_data == 0 || *end_data == 0 || *start_brk == 0) {
pr_err("%d's stat is corrupted/not complete\n", pid);
goto err_corrupted;
}
/*
* Now signals.
*/
fclose(file);
file = fopen_proc(pid_dir, "status");
if (!file) {
pr_perror("Can't open %d status\n", pid);