GETFSSTAT(2) UNIX Programmer's Manual GETFSSTAT(2) NAME getfsstat - get list of all mounted filesystems SYNOPSIS #include #include _i_n_t getfsstat(buf,bufsize,flags) _s_t_r_u_c_t _s_t_a_t_f_s *_b_u_f; _i_n_t _b_u_f_s_i_z_e; _i_n_t _f_l_a_g_s; DESCRIPTION Getfsstat() returns information about all mounted filesys- tems. _B_u_f is a pointer to _s_t_a_t_f_s structures defined as fol- lows: #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_NONE 0 #define MOUNT_UFS 1 /* Fast Filesystem */ Fields that are undefined for a particular filesystem are set to -1. The buffer is filled with an array of _f_s_s_t_a_t structures, one for each mounted filesystem up to the size specified by _b_u_f_s_i_z_e. If _b_u_f is given as NULL, getfsstat() returns just the number of mounted filesystems. Printed 11/26/99 December 24, 1995 1 GETFSSTAT(2) UNIX Programmer's Manual GETFSSTAT(2) Normally _f_l_a_g_s is currently unused. In 4.4BSD systems the usage is specified as MNT_WAIT. If _f_l_a_g_s is set to MNT_NOWAIT, getfsstat() will return the information it has available without requesting an update from each filesystem. Thus, some of the information will be out of date, but getfsstat() will not block waiting for information from a filesystem that is unable to respond. RETURN VALUES Upon successful completion, the number of _f_s_s_t_a_t structures is returned. Otherwise, -1 is returned and the global vari- able _e_r_r_n_o is set to indicate the error. ERRORS Getfsstat() fails if one or more of the following are true: [EFAULT] _B_u_f points to an invalid address. [EIO] An I/O error occurred while reading from or writing to the filesystem. SEE ALSO statfs(2), fstab(5), mount(8) HISTORY The getfsstat function first appeared in 4.4BSD. Printed 11/26/99 December 24, 1995 2