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/*
* check if a given path is a mountpoint
*/
#include <string.h>
#include <malloc.h>
#include <sys/stat.h>
int
is_mountpoint(char *path)
{
/* Check if 'path' is a current mountpoint.
* Possibly we should also check it is the mountpoint of the
* filesystem holding the target directory, but there doesn't
* seem a lot of point.
*
* We deem it to be a mountpoint if appending a ".." gives a different
* device or the same inode number.
*/
char *dotdot;
struct stat stb, pstb;
int rv;
dotdot = malloc(strlen(path)+4);
if (!dotdot)
return 0;
strcat(strcpy(dotdot, path), "/..");
if (lstat(path, &stb) != 0 ||
lstat(dotdot, &pstb) != 0)
rv = 0;
else
if (stb.st_dev != pstb.st_dev ||
stb.st_ino == pstb.st_ino)
rv = 1;
else
rv = 0;
free(dotdot);
return rv;
}
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