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. The buffer is filled with an array of Fa statfs structures, one for each mounted file system up to the size specified by Fa bufsize .
If Fa buf is given as NULL, Fn getfsstat returns just the number of mounted file systems.
Normally Fa flags should be specified as MNT_WAIT If Fa flags is set to MNT_NOWAIT Fn getfsstat will return the information it has available without requesting an update from each file system. Thus, some of the information will be out of date, but Fn getfsstat will not block waiting for information from a file system that is unable to respond.