From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga03.intel.com (mga03.intel.com [134.134.136.65]) by dpdk.org (Postfix) with ESMTP id 6ECD51B394; Thu, 1 Nov 2018 14:44:24 +0100 (CET) X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by orsmga103.jf.intel.com with ESMTP/TLS/DHE-RSA-AES256-GCM-SHA384; 01 Nov 2018 06:44:22 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.54,452,1534834800"; d="scan'208";a="83258211" Received: from fyigit-mobl.ger.corp.intel.com (HELO [10.237.221.79]) ([10.237.221.79]) by fmsmga008.fm.intel.com with ESMTP; 01 Nov 2018 06:44:21 -0700 To: Thomas Monjalon Cc: dev@dpdk.org, Bruce Richardson , stable@dpdk.org References: <20181031171928.61110-1-ferruh.yigit@intel.com> <1852957.HSzrH3FQxP@xps> <4957093e-f4f5-4c5b-27eb-bb1a86d6f74e@intel.com> <2447028.TNc9xFLSYW@xps> From: Ferruh Yigit Openpgp: preference=signencrypt Autocrypt: addr=ferruh.yigit@intel.com; prefer-encrypt=mutual; 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WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <2447028.TNc9xFLSYW@xps> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Subject: Re: [dpdk-dev] [PATCH] eal: fix API to get error string X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.15 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 01 Nov 2018 13:44:25 -0000 On 11/1/2018 1:40 PM, Thomas Monjalon wrote: > 01/11/2018 13:46, Ferruh Yigit: >> On 10/31/2018 6:43 PM, Thomas Monjalon wrote: >>> 31/10/2018 19:26, Ferruh Yigit: >>>> On 10/31/2018 6:26 PM, Ferruh Yigit wrote: >>>>> On 10/31/2018 5:16 PM, Thomas Monjalon wrote: >>>>>> 31/10/2018 18:19, Ferruh Yigit: >>>>>>> rte_strerror uses strerror_r(), and strerror_r() has two version of it. >>>>>>> - XSI-compliant version, (_POSIX_C_SOURCE >= 200112L) && ! _GNU_SOURCE >>>>>>> - GNU-specific version >>>>>>> >>>>>>> Those two has different return types, so the exiting return type check >>>>>>> is not correct for GNU-specific version. >>>>>>> >>>>>>> And this is causing failure in errno_autotest unit test. >>>>>>> >>>>>>> Adding different implementation for FreeBSD and Linux. >>>>>>> >>>>>>> Fixes: 016c32bd3e3d ("eal: cleanup strerror function") >>>>>>> Cc: stable@dpdk.org >>>>>>> >>>>>>> Signed-off-by: Ferruh Yigit >>>>>>> --- >>>>>>> --- a/lib/librte_eal/common/eal_common_errno.c >>>>>>> +++ b/lib/librte_eal/common/eal_common_errno.c >>>>>>> default: >>>>>>> +#ifdef RTE_EXEC_ENV_BSDAPP >>>>>>> if (strerror_r(errnum, ret, RETVAL_SZ) != 0) >>>>>>> snprintf(ret, RETVAL_SZ, "Unknown error%s %d", >>>>>>> sep, errnum); >>>>>>> +#else >>>>>>> + /* >>>>>>> + * _GNU_SOURCE version, error string is not always >>>>>>> + * strored in "ret" buffer, need to use return value >>>>>>> + */ >>>>>>> + ret = strerror_r(errnum, ret, RETVAL_SZ); >>>>>>> +#endif >>>>>> >>>>>> Why not use the return value in both cases? >>>>>> >>>>>> Why not writing an error message in Linux case? >>>>> >>>>> "man strerror_r" has more details, but briefly, >>>>> >>>>> The XSI-compliant strerror_r() function returns 0 on success. GNU one returns >>>>> the pointer to string. >>>>> >>>>> The XSI-compliant can return an empty buffer, GNU one always return a string, >>>>> either proper error string or "Unknown .." one. >>> >>> You say "GNU one always return a string" >>> The comment says: >>> _GNU_SOURCE version, error string is not always strored in "ret" buffer >> >> Yes, GNU one always return a char pointer to a string but that pointer may not >> be in the "ret" buffer. > > OK > > So I suggest only 2 minor changes: > - strored -> stored > - add a comment to explain that the error message from return value is enough That is what I was trying to say in comment, we can't trust "ret" buffer but need to use ret value which we can trust, I will re-visit the comment and fix typo > >>>> strerror_r() not portable. An alternative can be not using it at all... >>> >>> It's fine to use it. > > >