Merging tag sysfsutils-1_3_0 with main trunk.HEADoriginmaster

1 files changed, 61 insertions, 0 deletions

diff --git a/test/write_attr.c b/test/write_attr.c
new file mode 100644
index 0000000..5c28c7a
--- /dev/null
+++ b/test/write_attr.c
@@ -0,0 +1,61 @@
+/*
+ * write_attr.c
+ *
+ * Utility to modify the value of a given class device attribute
+ *
+ * Copyright (C) IBM Corp. 2003
+ *
+ *      This program is free software; you can redistribute it and/or modify it
+ *      under the terms of the GNU General Public License as published by the
+ *      Free Software Foundation version 2 of the License.
+ *
+ *      This program is distributed in the hope that it will be useful, but
+ *      WITHOUT ANY WARRANTY; without even the implied warranty of
+ *      MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ *      General Public License for more details.
+ *
+ *      You should have received a copy of the GNU General Public License along
+ *      with this program; if not, write to the Free Software Foundation, Inc.,
+ *      675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "libsysfs.h"
+
+static void print_usage(void)
+{
+        fprintf(stdout, "Usage: write_attr [classname] [device] [attribute] [new_value]\n");
+}
+
+int main(int argc, char *argv[])
+{
+	struct sysfs_attribute *attr = NULL;
+
+	if (argc != 5) {
+		print_usage();
+		return 1;
+	}
+
+	attr = sysfs_open_classdev_attr(argv[1], argv[2], argv[3]);
+	if (attr == NULL) {
+		fprintf(stdout, "Attribute %s not defined for classdev %s\n", 
+					argv[3], argv[2]);
+		return 1;
+	}
+
+	fprintf(stdout, "Attribute %s presently has a value %s\n", 
+					attr->name, attr->value);
+	if ((sysfs_write_attribute(attr, argv[4], strlen(argv[4]))) != 0) {
+		fprintf(stdout, "Error writing attribute value\n");
+		sysfs_close_attribute(attr);
+		return 1;
+	}
+	fprintf(stdout, "Attribute value after write is %s\n", attr->value);
+	sysfs_close_attribute(attr);
+	return 0;
+}
+