linux-kernel - [PATCH 01/18] usbip: sysfs_utils: add read_sysfs

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Date:	Tue, 16 Sep 2014 23:38:38 +0000
From:	Maximilian Eschenbacher <maximilian@...henbacher.email>
To:	linux-kernel@...r.kernel.org
Cc:	valentina.manea.m@...il.com, shuah.kh@...sung.com,
	gregkh@...uxfoundation.org,
	Maximilian Eschenbacher <maximilian@...henbacher.email>,
	Fjodor Schelichow <fjodor.schelichow@...mail.com>,
	Johannes Stadlinger <johannes.stadlinger@....de>
Subject: [PATCH 01/18] usbip: sysfs_utils: add read_sysfs_attribute

Previous rework of usbip's sysfs access structures called for a
read_sysfs_attribute function to be implemented in sysfs_utils.c

Signed-off-by: Maximilian Eschenbacher <maximilian@...henbacher.email>
Signed-off-by: Fjodor Schelichow <fjodor.schelichow@...mail.com>
Signed-off-by: Johannes Stadlinger <johannes.stadlinger@....de>
---
 tools/usb/usbip/libsrc/sysfs_utils.c | 23 +++++++++++++++++++++++
 tools/usb/usbip/libsrc/sysfs_utils.h |  1 +
 2 files changed, 24 insertions(+)

diff --git a/tools/usb/usbip/libsrc/sysfs_utils.c b/tools/usb/usbip/libsrc/sysfs_utils.c
index 36ac88e..fc6d9f9 100644
--- a/tools/usb/usbip/libsrc/sysfs_utils.c
+++ b/tools/usb/usbip/libsrc/sysfs_utils.c
@@ -29,3 +29,26 @@ int write_sysfs_attribute(const char *attr_path, const char *new_value,
 
 	return 0;
 }
+
+int read_sysfs_attribute(const char *attr_path, char *buffer, size_t buffsize)
+{
+	int fd;
+	int length;
+
+	fd = open(attr_path, O_RDONLY);
+	if (fd < 0) {
+		dbg("error opening attribute %s", attr_path);
+		return -1;
+	}
+
+	length = read(fd, buffer, buffsize);
+	if (length < 0) {
+		dbg("error reading from attribute %s", attr_path);
+		close(fd);
+		return -1;
+	}
+
+	close(fd);
+
+	return length;
+}
diff --git a/tools/usb/usbip/libsrc/sysfs_utils.h b/tools/usb/usbip/libsrc/sysfs_utils.h
index 32ac1d1..c1f1b79 100644
--- a/tools/usb/usbip/libsrc/sysfs_utils.h
+++ b/tools/usb/usbip/libsrc/sysfs_utils.h
@@ -4,5 +4,6 @@
 
 int write_sysfs_attribute(const char *attr_path, const char *new_value,
 			  size_t len);
+int read_sysfs_attribute(const char *attr_path, char *buffer, size_t buffsize);
 
 #endif
-- 
2.1.0

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