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[192.94.31.2]) by smtp.gmail.com with ESMTPSA id e18sm10538239wrs.48.2021.12.06.00.23.31 for (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 06 Dec 2021 00:23:32 -0800 (PST) Message-ID: Date: Mon, 6 Dec 2021 09:23:31 +0100 List-Id: Technical discussions relating to FreeBSD List-Archive: https://lists.freebsd.org/archives/freebsd-hackers List-Help: List-Post: List-Subscribe: List-Unsubscribe: Sender: owner-freebsd-hackers@freebsd.org MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:91.0) Gecko/20100101 Thunderbird/91.3.2 Subject: Re: Is it possible to determine the open file path based on the file descriptor? To: freebsd-hackers@freebsd.org References: <21b0280d-c290-f27f-98a9-0c2242380718@rawbw.com> <5a00f93e-21a1-47ab-6e8e-15d24840c525@rawbw.com> <20200708175300.GA2866@kib.kiev.ua> <656bf089-bcc9-748a-6db2-52f3707e863c@rawbw.com> From: "Floyd, Paul" In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 4J6xK15k0tz4VTb X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20210112 header.b=Dmc8d8TK; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of paulf2718@gmail.com designates 2a00:1450:4864:20::32f as permitted sender) smtp.mailfrom=paulf2718@gmail.com X-Spamd-Result: default: False [-2.98 / 15.00]; RCVD_VIA_SMTP_AUTH(0.00)[]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36:c]; FREEMAIL_FROM(0.00)[gmail.com]; TO_DN_NONE(0.00)[]; RCVD_COUNT_THREE(0.00)[3]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; NEURAL_HAM_SHORT(-1.00)[-0.999]; FROM_EQ_ENVFROM(0.00)[]; SUBJECT_ENDS_QUESTION(1.00)[]; MIME_TRACE(0.00)[0:+]; FREEMAIL_ENVFROM(0.00)[gmail.com]; MID_RHS_MATCH_FROM(0.00)[]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; ARC_NA(0.00)[]; NEURAL_HAM_MEDIUM(-0.98)[-0.980]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20210112]; FROM_HAS_DN(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; TO_MATCH_ENVRCPT_ALL(0.00)[]; NEURAL_HAM_LONG(-1.00)[-1.000]; MIME_GOOD(-0.10)[text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; RCPT_COUNT_ONE(0.00)[1]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::32f:from]; RCVD_TLS_ALL(0.00)[] X-ThisMailContainsUnwantedMimeParts: N On 2021-12-05 19:54, Konstantin Belousov wrote: > On Sun, Dec 05, 2021 at 09:53:23AM -0800, Yuri wrote: >> On 7/8/20 10:53, Konstantin Belousov wrote: >>> I think an immediately useful addition would be a sysctl or fcntl that >>> return struct kinfo_file for single file descriptor. [snip] >>> https://reviews.freebsd.org/D33277 That looks really nice. It's possible to do this with sysctl CTL_KERN / VKI_KERN_PROC / KERN_PROC_FILEDESC but that gets info for all file descriptors, meaning that you then have to search for the one that you want. https://github.com/paulfloyd/freebsd_valgrind/blob/freebsd/coregrind/m_libcfile.c#L121 (I'm not the author of that bit of code). A+ Paul