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#include <fcntl.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <linux/types.h>
#include <uuid/uuid.h>
struct fs_sysfs_path {
__u8 len;
__u8 name[128];
};
#define FS_IOC_GETFSSYSFSPATH _IOR(0x15, 1, struct fs_sysfs_path)
void die(const char *fmt, ...)
{
va_list args;
va_start(args, fmt);
vfprintf(stderr, fmt, args);
va_end(args);
fputc('\n', stderr);
_exit(EXIT_FAILURE);
}
int main(int argc, char *argv[])
{
const char *path = argv[1] ?: ".";
int fd = open(path, O_RDONLY);
if (fd < 0)
die("Error opening %s: %m\n", path);
struct fs_sysfs_path sysfspath;
if (ioctl(fd, FS_IOC_GETFSSYSFSPATH, (unsigned long) &sysfspath))
die("FS_IOC_GETFSSYSFSPATH error: %m\n");
write(STDOUT_FILENO, sysfspath.name, sysfspath.len);
}
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