From owner-freebsd-hackers@freebsd.org Thu Sep 17 13:26:06 2020 Return-Path: Delivered-To: freebsd-hackers@mailman.nyi.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2610:1c1:1:606c::19:1]) by mailman.nyi.freebsd.org (Postfix) with ESMTP id 078CD3E0275 for ; Thu, 17 Sep 2020 13:26:06 +0000 (UTC) (envelope-from arka.sw1988@gmail.com) Received: from mail-wr1-x434.google.com (mail-wr1-x434.google.com [IPv6:2a00:1450:4864:20::434]) (using TLSv1.3 with cipher TLS_AES_128_GCM_SHA256 (128/128 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits) server-digest SHA256 client-signature RSA-PSS (2048 bits) client-digest SHA256) (Client CN "smtp.gmail.com", Issuer "GTS CA 1O1" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 4Bsd5T0Xbcz40Wg for ; Thu, 17 Sep 2020 13:26:04 +0000 (UTC) (envelope-from arka.sw1988@gmail.com) Received: by mail-wr1-x434.google.com with SMTP id x14so2048995wrl.12 for ; Thu, 17 Sep 2020 06:26:04 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=mime-version:from:date:message-id:subject:to; bh=/g4kLICxl6cxcu0Asn9TjptQG5TaWaTagoCs8/sqPA8=; b=IJlnEI0/vY7LDbwhFmYE77TtVxWc2+UtGkOmSwBURTOjIx4/OlJHipWVGE+7WOYk0L fkR2QzoM6tcvf3eyjTqt+TiQqpOKaVwQHxUev+OD3jIFMYbFFu5ywc3s/Z/G8YuteWKj /wWhhN1rKU5scACQWb/to0IyoOR9yQVpV9bKC52DRqHKraCdk8yNWomcldWWGDvf4Yx9 j+OYgB4WJqSGDkES+eYvnp7IN4hBmXkp9S4YF5hqCDzAHoG6uEYhoyXkGgqqPQRl3xHs Sq92Kq11drb14JpnkSuBO6zWU4Fb4/pSa8B/+BkFJ+0AGzHRQyUMnnaPxqIRfX5qrSLG ncfA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:mime-version:from:date:message-id:subject:to; bh=/g4kLICxl6cxcu0Asn9TjptQG5TaWaTagoCs8/sqPA8=; b=rm9P/MYbUKYHFP5xdgZ2rOv+3c80GkuhBqw8QFrkIKQZ0Lj1++N2qcmluS/zVxjXFE 3QjggyX7g5h0zI0490bz90uUfrmHPIKM3kufG6jdaW+ZH6aCg2wHIjAOVANfklHB2uh7 2cp2FwFwsSXt4z8JLfWoZkfWIo8zjbw6vgTnd6eAoS/iiMxDteLm+zxnPCbAmM2xkk7Q F9aFluJ52lrmx00M/or5fHXpH96NNXNyiz4kzCJkwcoMPzbsq3tAnNuBsWwGgqe+R7vf sTaZlBCHE7jHo+Fma3K+FBHkFKvrpgskzeHNeh+In8VnMaccLzNoLF2a45kbmkjFQYpO yfgQ== X-Gm-Message-State: AOAM533EOavglgYrz/ycPj/XYgsf+Yx2kDg9UKDNiYx9ztIeUgHZfAGz AbBs2zJW0lWCCllUz/ObBBoWViTJ8vf4OGS3ir/SMHUL X-Google-Smtp-Source: ABdhPJyJQErIXS5EXgPg6GeX4EsCHjv2jRX7edVBzeKJr/D8uboidOIQIgUhS/gv5ht3lOLOzcuo8W0fOw3PAIO3aFs= X-Received: by 2002:a5d:518b:: with SMTP id k11mr31593886wrv.369.1600349163271; Thu, 17 Sep 2020 06:26:03 -0700 (PDT) MIME-Version: 1.0 From: Arka Sharma Date: Thu, 17 Sep 2020 18:55:51 +0530 Message-ID: Subject: ENOBUFS at reading end of a pipe To: freebsd-hackers@freebsd.org X-Rspamd-Queue-Id: 4Bsd5T0Xbcz40Wg X-Spamd-Bar: -- Authentication-Results: mx1.freebsd.org; dkim=pass header.d=gmail.com header.s=20161025 header.b=IJlnEI0/; dmarc=pass (policy=none) header.from=gmail.com; spf=pass (mx1.freebsd.org: domain of arkasw1988@gmail.com designates 2a00:1450:4864:20::434 as permitted sender) smtp.mailfrom=arkasw1988@gmail.com X-Spamd-Result: default: False [-2.69 / 15.00]; RCVD_TLS_ALL(0.00)[]; ARC_NA(0.00)[]; R_DKIM_ALLOW(-0.20)[gmail.com:s=20161025]; NEURAL_HAM_MEDIUM(-1.01)[-1.006]; FROM_HAS_DN(0.00)[]; DWL_DNSWL_NONE(0.00)[gmail.com:dkim]; FREEMAIL_FROM(0.00)[gmail.com]; TO_MATCH_ENVRCPT_ALL(0.00)[]; MIME_GOOD(-0.10)[multipart/alternative,text/plain]; PREVIOUSLY_DELIVERED(0.00)[freebsd-hackers@freebsd.org]; TO_DN_NONE(0.00)[]; RCPT_COUNT_ONE(0.00)[1]; NEURAL_HAM_LONG(-1.02)[-1.021]; R_SPF_ALLOW(-0.20)[+ip6:2a00:1450:4000::/36]; DKIM_TRACE(0.00)[gmail.com:+]; DMARC_POLICY_ALLOW(-0.50)[gmail.com,none]; RCVD_IN_DNSWL_NONE(0.00)[2a00:1450:4864:20::434:from]; NEURAL_SPAM_SHORT(0.34)[0.336]; FROM_EQ_ENVFROM(0.00)[]; MIME_TRACE(0.00)[0:+,1:+,2:~]; FREEMAIL_ENVFROM(0.00)[gmail.com]; ASN(0.00)[asn:15169, ipnet:2a00:1450::/32, country:US]; TAGGED_FROM(0.00)[]; MAILMAN_DEST(0.00)[freebsd-hackers]; RCVD_COUNT_TWO(0.00)[2] Content-Type: text/plain; charset="UTF-8" X-Content-Filtered-By: Mailman/MimeDel 2.1.33 X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.33 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 17 Sep 2020 13:26:06 -0000 Hi all, Let's say a parent process is writing to a pipe and child is reading. Is there a possibility that write is success but the child is getting ENOBUFS while reading. In this case the write precedes the read. Regards, Arka