From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 6034AC2BB86 for ; Thu, 9 Apr 2020 13:28:33 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 376282072F for ; Thu, 9 Apr 2020 13:28:33 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="JOaaAD1b" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726632AbgDIN2c (ORCPT ); Thu, 9 Apr 2020 09:28:32 -0400 Received: from mail-lf1-f67.google.com ([209.85.167.67]:44793 "EHLO mail-lf1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726817AbgDIN2c (ORCPT ); Thu, 9 Apr 2020 09:28:32 -0400 Received: by mail-lf1-f67.google.com with SMTP id 131so7860587lfh.11 for ; Thu, 09 Apr 2020 06:28:31 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=yDbsjsf0fa/m4NJ1OsjkfzThQeEW/rDZdhpouDM8e/c=; b=JOaaAD1boU2Iy9aRnoXi8LCijF3hEldKtpg7jGQyuViAqE+FdNPRy/TW361CkQbaWz LF3wUP24tK83UGSCDIa0RL95eAutGWMrupMZadW2FKB+oS2/X1KnslYELzHVBzJALjwz RMVX5ZCSFT0mtT8lDzvAlFAnTVFpCHK4MI2M4GQGzhEUIu0BN7FCyYIUvsWQKxBuQC8P tr2QaYc3Fst3SlAzHXX39O30AfHQtmI5mx9yh/a/EL38ZdwKo6mspWGahULS5jp1nmgO i0amCTSwo482mxOhfgewu4nExpA9y2Bw5CRvZl8HMA+qlALd9GP5FKBHjWAIN8oLqRzd wkMA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=yDbsjsf0fa/m4NJ1OsjkfzThQeEW/rDZdhpouDM8e/c=; b=TV7LsS9DOgC03wzc5mpGdv9wq91M5pjD3eTHxnEMw6/hM0j/gSaFvpZrVjWstWtE0r DE3RWZFJCKfVSXdgPKNWWVoKyMSL9npmDwxOTBEGugq3Az963+7imSFCNXo0luafTMUF 7KhGvfjNyHE7EGYjrVqMDtvFoL7C5PxmZ7STdJT3U1Q/4viyfhFIKKD8Q+U3SbOoDDkB rIUmmaMwLb/JM230klZoPYV5nmfWzBW3Smjv/TpHsovZFxDnv8OmuvnGpNlr54zxYv3q x48IkN6uj9ykA+AMhjttMdCORa380rGS/4c87+FE5YQfrdR424BrRy8N2pTsYcsXLt5f VXvA== X-Gm-Message-State: AGi0Pua6v/N6UEY2Jod0YQevm5lMwLf7DQlwjp9TyDF9soDaATm2QGrh v/E6huGAIyg8k/HfsgWQMbA= X-Google-Smtp-Source: APiQypIUh2WB0/dqM+tlOeeEM3S/bncjUAOb2da6FZ3qsrHlmvMs+GvzYZ7xwh8PufKOLOWnZmYQFA== X-Received: by 2002:a19:dc05:: with SMTP id t5mr3107248lfg.156.1586438910334; Thu, 09 Apr 2020 06:28:30 -0700 (PDT) Received: from oberon.zico.biz ([83.222.187.186]) by smtp.gmail.com with ESMTPSA id 64sm15237121ljj.41.2020.04.09.06.28.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 09 Apr 2020 06:28:29 -0700 (PDT) From: "Tzvetomir Stoyanov (VMware)" To: rostedt@goodmis.org Cc: linux-trace-devel@vger.kernel.org Subject: [PATCH 2/2] trace-cmd: Add new API tracecmd_open_head() Date: Thu, 9 Apr 2020 16:28:25 +0300 Message-Id: <20200409132825.79475-3-tz.stoyanov@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200409132825.79475-1-tz.stoyanov@gmail.com> References: <20200409132825.79475-1-tz.stoyanov@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-trace-devel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-trace-devel@vger.kernel.org Add an API to create a tracecmd_handle from a file, read and parse only the trace headers from the file. This allows to implement opening a trace file on stages - reading the trace headers and reading the trace data. Signed-off-by: Tzvetomir Stoyanov (VMware) --- include/trace-cmd/trace-cmd.h | 1 + lib/trace-cmd/trace-input.c | 28 ++++++++++++++++++++++++++++ 2 files changed, 29 insertions(+) diff --git a/include/trace-cmd/trace-cmd.h b/include/trace-cmd/trace-cmd.h index 3f96bbde..e22aa251 100644 --- a/include/trace-cmd/trace-cmd.h +++ b/include/trace-cmd/trace-cmd.h @@ -143,6 +143,7 @@ typedef void (*tracecmd_handle_init_func)(struct tracecmd_input *handle, struct tracecmd_input *tracecmd_alloc(const char *file); struct tracecmd_input *tracecmd_alloc_fd(int fd); struct tracecmd_input *tracecmd_open(const char *file); +struct tracecmd_input *tracecmd_open_head(const char *file); struct tracecmd_input *tracecmd_open_fd(int fd); void tracecmd_ref(struct tracecmd_input *handle); void tracecmd_close(struct tracecmd_input *handle); diff --git a/lib/trace-cmd/trace-input.c b/lib/trace-cmd/trace-input.c index ee9bfb52..efc8d4bd 100644 --- a/lib/trace-cmd/trace-input.c +++ b/lib/trace-cmd/trace-input.c @@ -3175,6 +3175,34 @@ struct tracecmd_input *tracecmd_open(const char *file) return tracecmd_open_fd(fd); } +/** + * tracecmd_open_head - create a tracecmd_handle from a given file, read + * read and parse only the trace headers from the file + * @file: the file name of the file that is of tracecmd data type. + */ +struct tracecmd_input *tracecmd_open_head(const char *file) +{ + struct tracecmd_input *handle; + int fd; + + fd = open(file, O_RDONLY); + if (fd < 0) + return NULL; + + handle = tracecmd_alloc_fd(fd); + if (!handle) + return NULL; + + if (tracecmd_read_headers(handle) < 0) + goto fail; + + return handle; + +fail: + tracecmd_close(handle); + return NULL; +} + /** * tracecmd_ref - add a reference to the handle * @handle: input handle for the trace.dat file -- 2.25.1