xref: /OK3568_Linux_fs/kernel/tools/usb/usbip/libsrc/sysfs_utils.c (revision 4882a59341e53eb6f0b4789bf948001014eff981) 
1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun #include <sys/types.h>
3*4882a593Smuzhiyun #include <sys/stat.h>
4*4882a593Smuzhiyun #include <fcntl.h>
5*4882a593Smuzhiyun #include <errno.h>
6*4882a593Smuzhiyun 
7*4882a593Smuzhiyun #include "sysfs_utils.h"
8*4882a593Smuzhiyun #include "usbip_common.h"
9*4882a593Smuzhiyun 
write_sysfs_attribute(const char * attr_path,const char * new_value,size_t len)10*4882a593Smuzhiyun int write_sysfs_attribute(const char *attr_path, const char *new_value,
11*4882a593Smuzhiyun 			  size_t len)
12*4882a593Smuzhiyun {
13*4882a593Smuzhiyun 	int fd;
14*4882a593Smuzhiyun 	int length;
15*4882a593Smuzhiyun 
16*4882a593Smuzhiyun 	fd = open(attr_path, O_WRONLY);
17*4882a593Smuzhiyun 	if (fd < 0) {
18*4882a593Smuzhiyun 		dbg("error opening attribute %s", attr_path);
19*4882a593Smuzhiyun 		return -1;
20*4882a593Smuzhiyun 	}
21*4882a593Smuzhiyun 
22*4882a593Smuzhiyun 	length = write(fd, new_value, len);
23*4882a593Smuzhiyun 	if (length < 0) {
24*4882a593Smuzhiyun 		dbg("error writing to attribute %s", attr_path);
25*4882a593Smuzhiyun 		close(fd);
26*4882a593Smuzhiyun 		return -1;
27*4882a593Smuzhiyun 	}
28*4882a593Smuzhiyun 
29*4882a593Smuzhiyun 	close(fd);
30*4882a593Smuzhiyun 
31*4882a593Smuzhiyun 	return 0;
32*4882a593Smuzhiyun }
33