#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 structures, one for each mounted
file system up to the size specified by If is given as NULL, returns
just the number of mounted file systems. Normally should be specified
as If is set to 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will be out of date, but will not block waiting for information from a
file system that is unable to respond.