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/*
* check if a given path is a mountpoint
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <string.h>
#include "xcommon.h"
#include <sys/stat.h>
#include "misc.h"
int
check_is_mountpoint(const char *path, int (mystat)(const char *, struct stat *))
{
if (!mystat)
mystat = lstat;
/* 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 = xmalloc(strlen(path)+4);
strcat(strcpy(dotdot, path), "/..");
if (mystat(path, &stb) != 0 ||
mystat(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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