[dpdk-stable] [PATCH v2 1/1] fbarray: get fbarrays from containerized secondary
Burakov, Anatoly
anatoly.burakov at intel.com
Fri Jul 5 10:53:50 CEST 2019
On 16-Apr-19 4:43 AM, ogawa.yasufumi at lab.ntt.co.jp wrote:
> From: Yasufumi Ogawa <ogawa.yasufumi at lab.ntt.co.jp>
>
> In secondary_msl_create_walk(), it creates a file for fbarrays with its
> PID for reserving unique name among secondary processes. However, it
> does not work if secondary is run as app container because each of
> containerized secondary has PID 1. To reserve unique name, use hostname
> instead of PID if the value is 1.
>
> Cc: stable at dpdk.org
>
> Signed-off-by: Yasufumi Ogawa <ogawa.yasufumi at lab.ntt.co.jp>
> ---
I'm not too well versed in containers - is this hostname 1) always set,
and 2) always unique?
<snip>
> + if (getpid() == 1) {
> + FILE *hn_fp;
> + hn_fp = fopen("/etc/hostname", "r");
> + if (hn_fp == NULL) {
> + RTE_LOG(ERR, EAL,
> + "Cannot open '/etc/hostname' for secondary\n");
> + return -1;
> + }
> +
> + /* with docker, /etc/hostname just has one entry of hostname */
> + if (fscanf(hn_fp, "%s", proc_id) == EOF)
> + return -1;
Wouldn't an error in fscanf() leak the file handle? I think you need to
fclose() before checking the result.
> + fclose(hn_fp);
> + } else
> + sprintf(proc_id, "%d", (int)getpid());
> +
> + snprintf(name, RTE_FBARRAY_NAME_LEN, "%s_%s",
> + primary_msl->memseg_arr.name, proc_id);
>
> ret = rte_fbarray_init(&local_msl->memseg_arr, name,
> primary_msl->memseg_arr.len,
>
--
Thanks,
Anatoly
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