From: Tal Shnaiderman <firstname.lastname@example.org> To: Dmitry Kozlyuk <email@example.com>, Nick Connolly <firstname.lastname@example.org> Cc: NBU-Contact-Thomas Monjalon <email@example.com>, "firstname.lastname@example.org" <email@example.com>, "firstname.lastname@example.org" <email@example.com>, "firstname.lastname@example.org" <email@example.com>, "firstname.lastname@example.org" <email@example.com> Subject: Re: [dpdk-dev] Windows: A fundamental issue (was eal/windows: definition for ETOOMANYREFS errno) Date: Thu, 19 Nov 2020 13:21:00 +0000 Message-ID: <CY4PR1201MB2548B9B8E3A2198936738BD8A4E00@CY4PR1201MB2548.namprd12.prod.outlook.com> (raw) In-Reply-To: <20201117155318.48728dac@sovereign> > Subject: Re: Windows: A fundamental issue (was eal/windows: definition for > ETOOMANYREFS errno) > > External email: Use caution opening links or attachments > > > Hi Nick, > > > This means that rte_os.h should not include POSIX/Linux definitions to > > avoid clashes such as the one seen with this change. It's clearly not > > sustainable if applications have to be modified every time we add more > > Windows support to the DPDK. > > > > Note that this is not an isolated issue - most of the definitions in > > rte_os.h (redefining close, unlink, strdup etc) should not be present > > if other layers (application, other libraries, etc) are to be able to > > implement their own POSIX/Linux support. > > The purpose of rte_os.h must be clarified. It now says: > > /** > * This is header should contain any function/macro definition > * which are not supported natively or named differently in the > * ... OS. Functions will be added in future releases. > */ > > This doesn't specify if the file should expose wrappers or POSIX-named bits. > Linux and FreeBSD, however, only use it for RTE_CPU_xxx() macros for > CPU_xxx() and don't define anything with POSIX names. So should Windows. > > > Please can we back this change out until we have a strategy that > > allows us to make these definitions available for 'internal' use, but > > prevent them being visible outside of the DPDK tree. If we can't wrap > > them with > > rte_* yet, perhaps the short term solution could be as simple as > > setting RTE_DEFINE_POSIX when building DPDK code and hiding them if it is > not set? > > You need the same value both inside DPDK to return it and outside of DPDK > to match on it. Returning an unnamed, unspecified code is not an option. > RTE_ prefix is a way to go. We can just rename ETOOMANYREFS. Thanks for the info Nick. Dmitry, If we go with RTE_ETOOMANYREFS, I assume we need to define it for Linux and FreeBSD as well? > > Strictly speaking, C standard defines very few errno, so using POSIX values in > API is incorrect anyway. It has to be deprecated and removed eventually, we > already had issues with MMAP_FAILED.
next prev parent reply other threads:[~2020-11-19 13:21 UTC|newest] Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-11-14 21:11 [dpdk-dev] [PATCH] eal/windows: definition for ETOOMANYREFS errno Tal Shnaiderman 2020-11-14 22:01 ` Dmitry Kozlyuk 2020-11-14 22:11 ` Tal Shnaiderman 2020-11-15 10:51 ` Thomas Monjalon 2020-11-15 14:23 ` Tal Shnaiderman 2020-11-14 22:21 ` [dpdk-dev] [PATCH v2] " Tal Shnaiderman 2020-11-14 23:13 ` Dmitry Kozlyuk 2020-11-15 23:10 ` Thomas Monjalon 2020-11-17 10:51 ` [dpdk-dev] Windows: A fundamental issue (was eal/windows: definition for ETOOMANYREFS errno) Nick Connolly 2020-11-17 12:53 ` Dmitry Kozlyuk 2020-11-19 13:21 ` Tal Shnaiderman [this message] 2020-11-19 14:46 ` Thomas Monjalon 2020-11-19 15:27 ` Tal Shnaiderman 2020-11-19 15:38 ` Nick Connolly
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