STATFS(2) UNIX Programmer's Manual STATFS(2) NAME statfs, fstatfs - get file system statistics SYNOPSIS #include #include _i_n_t statfs(path,buf) _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 fstatfs(fd,buf) _i_n_t _f_d; _s_t_r_u_c_t _s_t_a_t_f_s *_b_u_f; DESCRIPTION Statfs() returns information about a mounted file system. _P_a_t_h is the path name of any file within the mounted filesystem. _B_u_f is a pointer to a _s_t_a_t_f_s structure defined as follows: #define MNAMELEN 90 /* length of buffer for returned name */ struct statfs { short f_type; /* type of filesystem (see below) */ short f_flags; /* copy of mount flags */ short f_bsize; /* fundamental file system block size */ short 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 */ ino_t f_files; /* total file nodes in file system */ ino_t f_ffree; /* free file nodes in fs */ u_long f_fsid[2]; /* file system id */ long f_spare[4]; /* spare for later */ char f_mntonname[MNAMELEN]; /* mount point */ char f_mntfromname[MNAMELEN]; /* mounted filesystem */ }; /* * File system types. - Only UFS is supported so the other types are not * given. */ #define MOUNT_UFS 1 /* Fast Filesystem */ Fields that are undefined for a particular file system are set to -1. Fstatfs() returns the same information about an open file referenced by descriptor _f_d. Printed 11/26/99 December 26, 1995 1 STATFS(2) UNIX Programmer's Manual STATFS(2) RETURN VALUES Upon successful completion, a value of 0 is returned. Oth- erwise, -1 is returned and the global variable _e_r_r_n_o is set to indicate the error. ERRORS Statfs() 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. [EINVAL] _p_a_t_h contains a character with the high-order bit set. [ENAMETOOLONG] The length of a component of _p_a_t_h exceeds 63 characters, or the length of _p_a_t_h exceeds 255 characters. [ENOENT] The file referred to by _p_a_t_h does not exist. [EACCES] Search permission is denied for a com- ponent 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. Fstatfs() 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. HISTORY The statfs function first appeared in 4.4BSD. Printed 11/26/99 December 26, 1995 2