From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S944817AbdEZTzF (ORCPT ); Fri, 26 May 2017 15:55:05 -0400 Received: from mga06.intel.com ([134.134.136.31]:8083 "EHLO mga06.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S937586AbdEZTzB (ORCPT ); Fri, 26 May 2017 15:55:01 -0400 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.38,399,1491289200"; d="scan'208";a="1153304714" From: kan.liang@intel.com To: acme@kernel.org, tglx@linutronix.de, mingo@redhat.com, linux-kernel@vger.kernel.org Cc: peterz@infradead.org, eranian@google.com, jolsa@kernel.org, elliott@hpe.com, ak@linux.intel.com, Kan Liang Subject: [PATCH V2 1/2] tools lib api fs: Add sysfs__write_int function Date: Fri, 26 May 2017 12:05:37 -0700 Message-Id: <1495825538-5230-2-git-send-email-kan.liang@intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1495825538-5230-1-git-send-email-kan.liang@intel.com> References: <1495825538-5230-1-git-send-email-kan.liang@intel.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Kan Liang Adding sysfs__write_int function to ease up writing int to sysfs. New interface is: int sysfs__write_int(const char *entry, int value); Also, introducing filename__write_int which is useful for new helpers to write sysctl values. Signed-off-by: Kan Liang --- tools/lib/api/fs/fs.c | 30 ++++++++++++++++++++++++++++++ tools/lib/api/fs/fs.h | 4 ++++ 2 files changed, 34 insertions(+) diff --git a/tools/lib/api/fs/fs.c b/tools/lib/api/fs/fs.c index 809c772..a7ecf8f 100644 --- a/tools/lib/api/fs/fs.c +++ b/tools/lib/api/fs/fs.c @@ -387,6 +387,22 @@ int filename__read_str(const char *filename, char **buf, size_t *sizep) return err; } +int filename__write_int(const char *filename, int value) +{ + int fd = open(filename, O_WRONLY), err = -1; + char buf[64]; + + if (fd < 0) + return err; + + sprintf(buf, "%d", value); + if (write(fd, buf, sizeof(buf)) == sizeof(buf)) + err = 0; + + close(fd); + return err; +} + int procfs__read_str(const char *entry, char **buf, size_t *sizep) { char path[PATH_MAX]; @@ -480,3 +496,17 @@ int sysctl__read_int(const char *sysctl, int *value) return filename__read_int(path, value); } + +int sysfs__write_int(const char *entry, int value) +{ + char path[PATH_MAX]; + const char *sysfs = sysfs__mountpoint(); + + if (!sysfs) + return -1; + + if (snprintf(path, sizeof(path), "%s/%s", sysfs, entry) >= PATH_MAX) + return -1; + + return filename__write_int(path, value); +} diff --git a/tools/lib/api/fs/fs.h b/tools/lib/api/fs/fs.h index 956c211..4560534 100644 --- a/tools/lib/api/fs/fs.h +++ b/tools/lib/api/fs/fs.h @@ -31,6 +31,8 @@ int filename__read_int(const char *filename, int *value); int filename__read_ull(const char *filename, unsigned long long *value); int filename__read_str(const char *filename, char **buf, size_t *sizep); +int filename__write_int(const char *filename, int value); + int procfs__read_str(const char *entry, char **buf, size_t *sizep); int sysctl__read_int(const char *sysctl, int *value); @@ -38,4 +40,6 @@ int sysfs__read_int(const char *entry, int *value); int sysfs__read_ull(const char *entry, unsigned long long *value); int sysfs__read_str(const char *entry, char **buf, size_t *sizep); int sysfs__read_bool(const char *entry, bool *value); + +int sysfs__write_int(const char *entry, int value); #endif /* __API_FS__ */ -- 2.7.4