STATFS(2) BSD Programmer's Manual STATFS(2)NAME
statfs - get file system statistics
SYNOPSIS
#include <sys/param.h>
#include <sys/mount.h>
int
statfs(const char *path, struct statfs *buf);
int
fstatfs(int fd, struct statfs *buf);
DESCRIPTIONstatfs() returns information about a mounted file system. path is the
path name of any file within the mounted file system. buf is a pointer to
a statfs structure defined as follows:
typedef struct { int32_t val[2]; } fsid_t;
#define MFSNAMELEN 16 /* length of fs type name, including nul */
#define MNAMELEN 90 /* length of buffer for returned name */
struct statfs {
u_int32_t f_flags; /* copy of mount flags */
int32_t f_bsize; /* fundamental file system block size */
u_int32_t f_iosize; /* optimal transfer block size */
u_int32_t f_blocks; /* total data blocks in file system */
u_int32_t f_bfree; /* free blocks in fs */
int32_t f_bavail; /* free blocks avail to non-superuser */
u_int32_t f_files; /* total file nodes in file system */
u_int32_t f_ffree; /* free file nodes in fs */
fsid_t f_fsid; /* file system id */
uid_t f_owner; /* user that mounted the file system */
u_int32_t f_syncwrites; /* count of sync writes since mount */
u_int32_t f_asyncwrites; /* count of async writes since mount */
u_int32_t f_ctime; /* last mount [-u] time */
u_int32_t f_spare[3]; /* spare for later */
char f_fstypename[MFSNAMELEN]; /* fs type name */
char f_mntonname[MNAMELEN]; /* directory on which mounted */
char f_mntfromname[MNAMELEN]; /* mounted file system */
union mount_info mount_info; /* per-filesystem mount options */
};
fstatfs() returns the same information about an open file referenced by
descriptor fd.
RETURN VALUES
Upon successful completion, a value of 0 is returned. Otherwise, -1 is
returned and the global variable errno is set to indicate the error.
ERRORSstatfs() fails if one or more of the following are true:
[ENOTDIR] A component of the path prefix of path is not a directory.
[ENAMETOOLONG]
The length of a component of path exceeds {NAME_MAX} char-
acters, or the length of path exceeds {PATH_MAX} charac-
ters.
[ENOENT] The file referred to by path does not exist.
[EACCES] Search permission is denied for a component of the path
prefix of path.
[ELOOP] Too many symbolic links were encountered in translating
path.
[EFAULT] buf or path points to an invalid address.
[EIO] An I/O error occurred while reading from or writing to the
file system.
fstatfs() fails if one or more of the following are true:
[EBADF] fd is not a valid open file descriptor.
[EFAULT] buf points to an invalid address.
[EIO] An I/O error occurred while reading from or writing to the
file system.
SEE ALSOdf(1), mount(2), stat(2)HISTORY
The statfs() function first appeared in 4.4BSD.
MirOS BSD #10-current February 11, 1994 1
