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proc: Add parse_mountinfo helper

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To restore inotify we need to know the
mount point device numbers, so this helper
parses /proc/pid/mountinfo file for that.

Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Cyrill Gorcunov
2012-05-04 13:38:00 +04:00
committed by Pavel Emelyanov
parent 3399650a9c
commit 9ea069d2c9
3 changed files with 52 additions and 0 deletions
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43
proc_parse.c
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@@ -437,3 +437,46 @@ err_parse:
fclose(f);
return 0;
}
int parse_mountinfo(pid_t pid, struct proc_mountinfo *mi, int nr_elems)
{
FILE *f = NULL;
char str[256];
int i = 0;
snprintf(str, sizeof(str), "/proc/%d/mountinfo", pid);
f = fopen(str, "r");
if (!f) {
pr_perror("Can't open %d mountinfo", pid);
return -1;
}
while (fgets(str, sizeof(str), f)) {
unsigned int kmaj, kmin, parent_mnt_id;
char parent_mnt_root[63];
int ret;
if ((i + 1) >= nr_elems) {
i = -ENOMEM;
goto out_close;
}
ret = sscanf(str, "%i %i %u:%u %63s %63s",
&mi[i].mnt_id, &parent_mnt_id,
&kmaj, &kmin, parent_mnt_root,
mi[i].mnt_root);
if (ret != 6) {
pr_err("Bad format in %d mountinfo\n", pid);
i = -1;
goto out_close;
}
mi[i].s_dev = MKKDEV(kmaj, kmin);
i++;
}
out_close:
fclose(f);
out:
return i;
}