From nobody Tue Feb 10 22:15:36 2026 Received: from mail-yb1-f202.google.com (mail-yb1-f202.google.com [209.85.219.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 193D114A0B5 for ; Fri, 16 Feb 2024 23:55:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.219.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708127719; cv=none; b=jMGwwby5shnQoNKOg7lhnRnh+dpEPrrzr+1yFzfwYTmgxGLl96pmjrLGnIKNMaymkFIIaivue/NdgZW0/WB14d9BsDCZ6jW3Xqq+mMwtSAAicsbUEkmaEFzBKkikGWQmrZZYJ0I8OstnFFe91KGMEwtZKZ9gbPiZGB/7L4NZA8g= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1708127719; c=relaxed/simple; bh=mlDvuBmPP3TrmLBy1TVdW9K7nfBnqAONps2iWBo5bv4=; h=Date:In-Reply-To:Message-Id:Mime-Version:References:Subject:From: To:Content-Type; b=GbGGREe5y0p1NeH5DjEB2r6PbarjzeZCrO7tLSMR8r419gsl3Rv946TiQgFu4rE/KgRTJUCRqFKE0C2QLss2gCy7WCbg+uonv6kE0rLkVLAxO79tbOOUShpu8SI/caE4FkHX3de30BWO2hkfPOrYxFhufk/e0Np1lOkGHj2yzEY= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=ACuy2cBZ; arc=none smtp.client-ip=209.85.219.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ACuy2cBZ" Received: by mail-yb1-f202.google.com with SMTP id 3f1490d57ef6-d9a541b720aso4323355276.0 for ; Fri, 16 Feb 2024 15:55:17 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1708127717; x=1708732517; darn=vger.kernel.org; h=to:from:subject:references:mime-version:message-id:in-reply-to:date :from:to:cc:subject:date:message-id:reply-to; bh=5lEV9flhamU87tdGpQxKOQUuN3cEGzsZvh7EhlSuOZU=; b=ACuy2cBZWhiTW9+iKRzz655YFWBTVgzPe+DXgBwi1Ie6wzzjfJJikFzV9VyIzOa04C ThrU24fX5R6o2JIeR613xK/c57JHWCEEJCiS75QExDwZFMnvNvhfzT/yuu6vOwqigEkq h4kjYkhcANSFBveK1PTOYRX5hkzQPl20spH3AQTPNYZZVzJvgQqzM5QNaHjNdmp4yKOP exmPdVqYiV3REVqSmtA/6ndsN3yDkX+bonf3bVGSBIEt6/7dc7arnMjvjZXGuMPejJGo ItGGHEg4x+8NTbP7GG/p6FL7nkG9P8SWKxcLj2EcGoqw7qlfmgQEWqb51QnoM+1W0m3r ttmw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1708127717; x=1708732517; h=to:from:subject:references:mime-version:message-id:in-reply-to:date :x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=5lEV9flhamU87tdGpQxKOQUuN3cEGzsZvh7EhlSuOZU=; b=rxw2HQUxKQtVUt6xilEXcfAAw91TZHQ9BY+H5+ubXiP8oZ6POmIKpz4GQtnK/s66I7 JOFceKWSn+pHBoQ/uSM7P3EDDP11q9xZN7V/nh4Ovkaln5kQDZznlBx5uAca4pYyEdKu kzK7MSSZ4t7Qbtz0ekYrJK4nZZFNvBag9Wqlw10cg45PxTe/Gba3/AyhdZB5sDYiMZIb Jl2HZYTyszILSDCbbTot1XhnrEzMZGK2Cky/Uen2WE2ASbHuQwVSOSoIBLIW6LVwY/TU DHGIxsDUcTwL160+TIvoo4702dJu/0O9rojoq+JH8Gcj0VfREb09qon+5xPoq1nP8XrD qBJg== X-Forwarded-Encrypted: i=1; AJvYcCUanLc9dkwiJMYlvVk7cm3XwhpCqAR99/E0KAckDegiMNmhqkqKO2l2XG7/iYAkuya//4NRqZmJ8VSY+GdVjU0OdazH0s6Q9BHB38WK X-Gm-Message-State: AOJu0YzN7c/L6IgveVqvJd79L2qbU5qqqxTjNFUqDJ/ItoebI95pUDsO 9L935dJ5n9mSvSp7DBXr/Q4MZPqtbBvlD4l/euc2ojVjE9J1Hb+gScQsTG6sEVMMr8l228l7/yP Wc6PZTQ== X-Google-Smtp-Source: AGHT+IEUu7ZIc4xVQBBz95yM/6If+AfmIrGt97iohTygKIEoa3vU8cULrj/7pehsYjAaNFO5DYaZGw3d50RX X-Received: from irogers.svl.corp.google.com ([2620:15c:2a3:200:4b5c:352:4272:e34e]) (user=irogers job=sendgmr) by 2002:a25:b20e:0:b0:dc6:ff54:249f with SMTP id i14-20020a25b20e000000b00dc6ff54249fmr1454658ybj.8.1708127717121; Fri, 16 Feb 2024 15:55:17 -0800 (PST) Date: Fri, 16 Feb 2024 15:51:56 -0800 In-Reply-To: <20240216235203.229256-1-irogers@google.com> Message-Id: <20240216235203.229256-3-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240216235203.229256-1-irogers@google.com> X-Mailer: git-send-email 2.44.0.rc0.258.g7320e95886-goog Subject: [PATCH v5 2/8] perf list: Add scandirat compatibility function From: Ian Rogers To: Peter Zijlstra , Ingo Molnar , Arnaldo Carvalho de Melo , Namhyung Kim , Mark Rutland , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Athira Jajeev , James Clark , Kan Liang , Yang Jihong , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, llvm@lists.linux.dev Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" scandirat is used during the printing of tracepoint events but may be missing from certain libcs. Add a compatibility implementation that uses the symlink of an fd in /proc as a path for the reliably present scandir. Signed-off-by: Ian Rogers --- tools/perf/util/print-events.c | 12 +++--------- tools/perf/util/util.c | 19 +++++++++++++++++++ tools/perf/util/util.h | 8 ++++++++ 3 files changed, 30 insertions(+), 9 deletions(-) diff --git a/tools/perf/util/print-events.c b/tools/perf/util/print-events.c index 9e47712507cc..bf79dd366e2e 100644 --- a/tools/perf/util/print-events.c +++ b/tools/perf/util/print-events.c @@ -63,6 +63,8 @@ void print_tracepoint_events(const struct print_callbacks= *print_cb __maybe_unus { char *events_path =3D get_tracing_file("events"); int events_fd =3D open(events_path, O_PATH); + struct dirent **sys_namelist =3D NULL; + int sys_items; =20 put_tracing_file(events_path); if (events_fd < 0) { @@ -70,10 +72,7 @@ void print_tracepoint_events(const struct print_callback= s *print_cb __maybe_unus return; } =20 -#ifdef HAVE_SCANDIRAT_SUPPORT -{ - struct dirent **sys_namelist =3D NULL; - int sys_items =3D tracing_events__scandir_alphasort(&sys_namelist); + sys_items =3D tracing_events__scandir_alphasort(&sys_namelist); =20 for (int i =3D 0; i < sys_items; i++) { struct dirent *sys_dirent =3D sys_namelist[i]; @@ -130,11 +129,6 @@ void print_tracepoint_events(const struct print_callba= cks *print_cb __maybe_unus } =20 free(sys_namelist); -} -#else - printf("\nWARNING: Your libc doesn't have the scandirat function, please = ask its maintainers to implement it.\n" - " As a rough fallback, please do 'ls %s' to see the availa= ble tracepoint events.\n", events_path); -#endif close(events_fd); } =20 diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c index c1fd9ba6d697..4f561e5e4162 100644 --- a/tools/perf/util/util.c +++ b/tools/perf/util/util.c @@ -552,3 +552,22 @@ int sched_getcpu(void) return -1; } #endif + +#ifndef HAVE_SCANDIRAT_SUPPORT +int scandirat(int dirfd, const char *dirp, + struct dirent ***namelist, + int (*filter)(const struct dirent *), + int (*compar)(const struct dirent **, const struct dirent **)) +{ + char path[PATH_MAX]; + int err, fd =3D openat(dirfd, dirp, O_PATH); + + if (fd < 0) + return fd; + + snprintf(path, sizeof(path), "/proc/%d/fd/%d", getpid(), fd); + err =3D scandir(path, namelist, filter, compar); + close(fd); + return err; +} +#endif diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h index 7c8915d92dca..9966c21aaf04 100644 --- a/tools/perf/util/util.h +++ b/tools/perf/util/util.h @@ -6,6 +6,7 @@ /* glibc 2.20 deprecates _BSD_SOURCE in favour of _DEFAULT_SOURCE */ #define _DEFAULT_SOURCE 1 =20 +#include #include #include #include @@ -56,6 +57,13 @@ int perf_tip(char **strp, const char *dirpath); int sched_getcpu(void); #endif =20 +#ifndef HAVE_SCANDIRAT_SUPPORT +int scandirat(int dirfd, const char *dirp, + struct dirent ***namelist, + int (*filter)(const struct dirent *), + int (*compar)(const struct dirent **, const struct dirent **)); +#endif + extern bool perf_singlethreaded; =20 void perf_set_singlethreaded(void); --=20 2.44.0.rc0.258.g7320e95886-goog