ustat(2) System Calls Manual ustat(2)
Name
ustat - get file system statistics
Syntax
#include <sys/types.h>
#include <ustat.h>
int ustat (dev, buf)
dev_t dev;
struct ustat *buf;
Description
The call returns information about a mounted file system. The dev argument is a device number identifying a device containing a mounted
file system. The buf argument is a pointer to a structure that includes the following elements:
daddr_t f_tfree; /* Total free blocks (Kbytes) */
ino_t f_tinode; /* Number of free inodes */
char f_fname[512]; /* Filsys name */
char f_fpack[6]; /* Filsys pack name */
The f_fpack always returns a null string.
Environment
SYSTEM V
Differs from System V definition in that the size of the f_fname structure element is 512 instead of 6, and the dev parameter is type dev_t
instead of int.
Diagnostics
The call fails if any of the following is true:
[EINVAL] The dev argument is not the device number of a device containing a mounted file system.
[EFAULT] The buf argument points outside the process's allocated address space.
[ETIMEDOUT] A connect request or remote file operation failed, because the connected party did not properly respond after a period of
time that is dependent on the communications protocol.
See Also
stat(2), fs(5)
ustat(2)
