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STATFS(2) UNIX Programmer's Manual STATFS(2)
NNAAMMEE
ssttaattffss - get file system statistics
SSYYNNOOPPSSIISS
##iinncclluuddee <<ssyyss//ppaarraamm..hh>>
##iinncclluuddee <<ssyyss//mmoouunntt..hh>>
_i_n_t
ssttaattffss(_c_o_n_s_t _c_h_a_r _*_p_a_t_h, _s_t_r_u_c_t _s_t_a_t_f_s _*_b_u_f)
_i_n_t
ffssttaattffss(_i_n_t _f_d, _s_t_r_u_c_t _s_t_a_t_f_s _*_b_u_f)
DDEESSCCRRIIPPTTIIOONN
SSttaattffss() returns information about a mounted file system. _P_a_t_h is the
path name of any file within the mounted file system. _B_u_f is a pointer
to a ssttaattffss() structure defined as follows:
typedef struct { int32_t val[2]; } fsid_t;
#define MFSNAMELEN 16 /* length of fs type name, including nul */
#define MNAMELEN 32 /* length of buffer for returned name */
struct statfs {
short f_type; /* type of file system (unused; zero) */
short f_flags; /* copy of mount flags */
long f_bsize; /* fundamental file system block size */
long f_iosize; /* optimal transfer block size */
long f_blocks; /* total data blocks in file system */
long f_bfree; /* free blocks in fs */
long f_bavail; /* free blocks avail to non-superuser */
long f_files; /* total file nodes in file system */
long f_ffree; /* free file nodes in fs */
fsid_t f_fsid; /* file system id */
uid_t f_owner; /* user that mounted the file system */
long f_spare[4]; /* 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 */
};
Fields that are undefined for a particular file system are set to -1.
FFssttaattffss() returns the same information about an open file referenced by
descriptor _f_d.
RREETTUURRNN VVAALLUUEESS
Upon successful completion, a value of 0 is returned. Otherwise, -1 is
returned and the global variable _e_r_r_n_o is set to indicate the error.
EERRRROORRSS
SSttaattffss() fails if one or more of the following are true:
[ENOTDIR] A component of the path prefix of _P_a_t_h is not a directory.
[ENAMETOOLONG]
The length of a component of _p_a_t_h exceeds {NAME_MAX} char-
acters, or the length of _p_a_t_h exceeds {PATH_MAX} charac-
ters.
[ENOENT] The file referred to by _p_a_t_h does not exist.
[EACCES] Search permission is denied for a component of the path
prefix of _p_a_t_h.
[ELOOP] Too many symbolic links were encountered in translating
_p_a_t_h.
[EFAULT] _B_u_f or _p_a_t_h points to an invalid address.
[EIO] An I/O error occurred while reading from or writing to the
file system.
FFssttaattffss() fails if one or more of the following are true:
[EBADF] _F_d is not a valid open file descriptor.
[EFAULT] _B_u_f points to an invalid address.
[EIO] An I/O error occurred while reading from or writing to the
file system.
HHIISSTTOORRYY
The ssttaattffss() function first appeared in 4.4BSD.
BSD Experimental February 11, 1994 2