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cgm_get: support NULL value

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Signed-off-by: Serge Hallyn <serge.hallyn@ubuntu.com>
This commit is contained in:
Serge Hallyn 2014-01-23 13:35:50 -06:00
parent bfb1bb94c8
commit f6639e3bee
1 changed files with 6 additions and 0 deletions
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6
src/lxc/cgmanager.c
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@ -269,6 +269,12 @@ int cgm_get(const char *filename, char *value, size_t len, const char *name, con
} }
free(cgroup); free(cgroup);
newlen = strlen(result); newlen = strlen(result);
if (!value) {
// user queries the size
nih_free(result);
return newlen+1;
}
strncpy(value, result, len); strncpy(value, result, len);
if (newlen >= len) { if (newlen >= len) {
value[len-1] = '\0'; value[len-1] = '\0';