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/* write attribute support for the given device */
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <mntent.h>
#include <dirent.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include "libsysfs.h"
int main(int argc, char *argv[])
{
char *bus = NULL;
struct sysfs_device *device = NULL;
struct sysfs_attribute *attribute = NULL;
/*
* need args: device, attribute and value to be changed to
* eg: ./fn_name <device> <attribute> <val to change to>
*/
if (argc != 4) {
fprintf(stdout, "Need 4 args\n");
return 1;
}
bus = (char *)calloc(1, SYSFS_NAME_LEN);
device = sysfs_open_device_by_name(argv[1], bus, SYSFS_NAME_LEN);
if (device == NULL) {
fprintf(stdout, "Device %s not found\n", argv[1]);
free(bus);
return 1;
}
fprintf(stdout, "Device %s is a member of bus %s\n",
argv[1], bus);
fprintf(stdout, "\t\t%s\n", device->bus_id);
attribute = sysfs_get_device_attr(device, argv[2]);
if (attribute == NULL) {
fprintf(stdout, "Attribute %s not defined for device %s\n",
argv[2], argv[1]);
sysfs_close_device(device);
free(bus);
return 1;
}
if ((sysfs_write_attribute_value(attribute->path, argv[2])) < 0) {
fprintf(stdout, "Write attribute failed\n");
sysfs_close_device(device);
free(bus);
return 1;
}
fprintf(stdout, "Write succeeded\n");
sysfs_close_device(device);
free(bus);
return 0;
}
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