linux-kernel - [PATCH v3 2/5] cpupower: Add is_valid

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Message-ID: <20230619190503.4061-3-wyes.karny@amd.com>
Date:   Mon, 19 Jun 2023 19:05:00 +0000
From:   Wyes Karny <wyes.karny@....com>
To:     <trenn@...e.com>, <shuah@...nel.org>
CC:     <linux-pm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <rafael@...nel.org>, <gautham.shenoy@....com>,
        <Mario.Limonciello@....com>, <Ray.Huang@....com>,
        <Perry.Yuan@....com>, Wyes Karny <wyes.karny@....com>,
        Mario Limonciello <mario.limonciello@....com>
Subject: [PATCH v3 2/5] cpupower: Add is_valid_path API

Add is_valid_path API to check whether the sysfs file is present or not.

Suggested-by: Gautham R. Shenoy <gautham.shenoy@....com>
Reviewed-by: Mario Limonciello <mario.limonciello@....com>
Signed-off-by: Wyes Karny <wyes.karny@....com>
---
 tools/power/cpupower/lib/cpupower.c        | 7 +++++++
 tools/power/cpupower/lib/cpupower_intern.h | 1 +
 2 files changed, 8 insertions(+)

diff --git a/tools/power/cpupower/lib/cpupower.c b/tools/power/cpupower/lib/cpupower.c
index 3f7d0c0c5067..7a2ef691b20e 100644
--- a/tools/power/cpupower/lib/cpupower.c
+++ b/tools/power/cpupower/lib/cpupower.c
@@ -14,6 +14,13 @@
 #include "cpupower.h"
 #include "cpupower_intern.h"
 
+int is_valid_path(const char *path)
+{
+	if (access(path, F_OK) == -1)
+		return 0;
+	return 1;
+}
+
 unsigned int cpupower_read_sysfs(const char *path, char *buf, size_t buflen)
 {
 	ssize_t numread;
diff --git a/tools/power/cpupower/lib/cpupower_intern.h b/tools/power/cpupower/lib/cpupower_intern.h
index ac1112b956ec..5fdb8620d41b 100644
--- a/tools/power/cpupower/lib/cpupower_intern.h
+++ b/tools/power/cpupower/lib/cpupower_intern.h
@@ -7,5 +7,6 @@
 
 #define SYSFS_PATH_MAX 255
 
+int is_valid_path(const char *path);
 unsigned int cpupower_read_sysfs(const char *path, char *buf, size_t buflen);
 unsigned int cpupower_write_sysfs(const char *path, char *buf, size_t buflen);
-- 
2.34.1