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GETFSSTAT(2) UNIX Programmer's Manual GETFSSTAT(2)
NNAAMMEE
ggeettffssssttaatt - get list of all mounted filesystems
SSYYNNOOPPSSIISS
##iinncclluuddee <<ssyyss//ttyyppeess..hh>>
##iinncclluuddee <<ssyyss//mmoouunntt..hh>>
_i_n_t
ggeettffssssttaatt(_s_t_r_u_c_t _s_t_a_t_f_s _*_b_u_f, _l_o_n_g _b_u_f_s_i_z_e, _i_n_t _f_l_a_g_s)
DDEESSCCRRIIPPTTIIOONN
GGeettffssssttaatt() returns information about all mounted filesystems. _B_u_f is a
pointer to statfs structures defined as follows:
typedef quad fsid_t;
#define MNAMELEN 32 /* length of buffer for returned name */
struct statfs {
short f_type; /* type of filesystem (see below) */
short f_flags; /* copy of mount flags */
long f_fsize; /* fundamental filesystem block size */
long f_bsize; /* optimal transfer block size */
long f_blocks; /* total data blocks in filesystem */
long f_bfree; /* free blocks in fs */
long f_bavail; /* free blocks avail to nonsuperuser */
long f_files; /* total file nodes in filesystem */
long f_ffree; /* free file nodes in fs */
fsid_t f_fsid; /* filesystem id */
long f_spare[6]; /* spare for later */
char f_mntonname[MNAMELEN]; /* directory on which mounted */
char f_mntfromname[MNAMELEN]; /* mounted filesystem */
};
/*
* File system types.
*/
#define MOUNT_UFS 1
#define MOUNT_NFS 2
#define MOUNT_PC 3
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, ggeettffssssttaatt() returns just the number of mounted
filesystems.
Normally _f_l_a_g_s should be specified as MNT_WAIT. If _f_l_a_g_s is set to
MNT_NOWAIT, ggeettffssssttaatt() will return the information it has available
without requesting an update from each filesystem. Thus, some of the in
formation will be out of date, but ggeettffssssttaatt() will not block waiting for
information from a filesystem that is unable to respond.
RREETTUURRNN VVAALLUUEESS
Upon successful completion, the number of _f_s_s_t_a_t structures is returned.
Otherwise, 1 is returned and the global variable _e_r_r_n_o is set to indi
cate the error.
EERRRROORRSS
GGeettffssssttaatt() 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.
SSEEEE AALLSSOO
statfs(2), fstab(5), mount(8)
HHIISSTTOORRYY
The ggeettffssssttaatt function call is currently under development.
BSD Experimental July 23, 1991 2