From nobody Sun Feb 8 16:31:33 2026 Received: from mail-yw1-f201.google.com (mail-yw1-f201.google.com [209.85.128.201]) (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 F3DD210A25 for ; Wed, 14 Feb 2024 04:54:36 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707886478; cv=none; b=Bd1c4UUg3LZJmDYpDWECBoP/UFsBh2UnaL5lnxJOdghYbQpXw+BQwxSykvETl3Xlzum8MWp8/SuddrHzVTJ0tKinac38Yi8ICdJKgvBpyDcVl5gF+IPE70IdaMShtwMI+dciUL+RTcf/G3AmG63b4y+Rbs2KoZjohyRQcNhUM7M= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707886478; c=relaxed/simple; bh=NhiwdSNsgGhanFThf3Y8+0MhiUWCknICtVTm6IyvRmw=; h=Date:In-Reply-To:Message-Id:Mime-Version:References:Subject:From: To:Content-Type; b=TAaxskLtKMsEGgjIOXEIwKqsrSnWjPh/YbR8TP9B03LEGKsoIXQ+Ujg1Ly4wiRrhNqWa/XZYHZxSi2myjYg0cODWL3XTfm9abYYy9CAgRFnz0ovqT2Bae8GXu8mLY/NBYROBKxQN6CPNsONjKt/usKymneeJ7UaVI8nYZ0AWGjY= 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=1xGd8ewx; arc=none smtp.client-ip=209.85.128.201 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="1xGd8ewx" Received: by mail-yw1-f201.google.com with SMTP id 00721157ae682-6077e9dd249so25754347b3.3 for ; Tue, 13 Feb 2024 20:54:36 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1707886476; x=1708491276; 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=YmSZNQ356QtM9WesWCMinXmK9k2yULQ13GYKx7NLJhc=; b=1xGd8ewx+6QMWMCOnsEdqMLKF2N81vwpOJk7nUzwCgdEYXsLrTJ+FvcIBrAaaK0lR8 OdMY2SIRkPKDvbaN3kpV+gyiHeUQ3yRTZoz1mjG8gYUEJ17CBxBR9rVa0lrF7+uUqODs 62fDERGEZcArpHvYVrZLkGPkirMca7cqqdND83MY4HlQSdnKDWM66nzIBG5gGTuH1Fbz zrQoakOgLq3ugaAcRwzYXOfXAkTkzM1IfveEWAJkjZUx/XMnXjS+xUXFVy/EZTRV5Mpm m4n2rf6GgWIWvxIc4gY8sGqF30Bw/bt+//CYY9KPgYhwRkj5wF/ddt9cikvbcpISDtvA xpyQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1707886476; x=1708491276; 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=YmSZNQ356QtM9WesWCMinXmK9k2yULQ13GYKx7NLJhc=; b=Qu3OCMITEMOw1j1tjIMzR1KElREa3r9DDbyNUNHqA/mzx1ha1A5HVzsDott7iamsq0 DCsD3k2++gHGHUyNh5FoR0liJm3vkpu9uyYKlS3TuEupicZIY1BdwI6XpR0bF9RwObRr J8UXRWuEMY9Kpx8Na2ViIiom/q3eP33VwSyl3lAFmXBE3d8LG35qyXd1DPUlBOsF9NT9 E4Y/AEjXcEChCWIJ0Ogty97UGKk6I63g1mVgMuBjqsuJmDg32Q4MGFPD/uiSkTRU4IwV m9TXO3y1Ge/VR5doaxfNc1oVR0wqbitpBbskZLb99TPP8JCbvLR4XJ4Gv6/CYBRQp4uq tCdw== X-Forwarded-Encrypted: i=1; AJvYcCVVVps3OS8fC79db+H8fqwVTKep0law2u5lUpxpAhGWyIBstJm+66VxvIzOfi04y4WnUkAkjEkxCDAVjg79vSjR1r5wIQL8jmcNtNFT X-Gm-Message-State: AOJu0YzoxKS+VjQON5zCE0ZTq50XldNk29/utQepkwOce2BeIIg3ybfG NJxLYqAftKKdY8gfrY+svNnqTd/B1me7Jljvt18mbz7phJGKvQBe4SPMBVGA1FHTNM5gJeSZ3Hu kjxl0cA== X-Google-Smtp-Source: AGHT+IEFuvHaqaekRipzgHS56dLK9shPHnKIKYxXCRw4dh0QDC9cp+ued3K17AtYGH6E73IBBe9HedDMpOlG X-Received: from irogers.svl.corp.google.com ([2620:15c:2a3:200:6d92:85eb:9adc:66dd]) (user=irogers job=sendgmr) by 2002:a0d:eb15:0:b0:602:b7ce:f382 with SMTP id u21-20020a0deb15000000b00602b7cef382mr240294ywe.7.1707886476058; Tue, 13 Feb 2024 20:54:36 -0800 (PST) Date: Tue, 13 Feb 2024 20:53:50 -0800 In-Reply-To: <20240214045356.748330-1-irogers@google.com> Message-Id: <20240214045356.748330-3-irogers@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20240214045356.748330-1-irogers@google.com> X-Mailer: git-send-email 2.43.0.687.g38aa6559b0-goog Subject: [PATCH v4 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 , James Clark , Athira Jajeev , 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 2.43.0.687.g38aa6559b0-goog