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     getfsstat — get list of all mounted file systems


     Standard C Library (libc, -lc)


     #include <sys/param.h>
     #include <sys/ucred.h>
     #include <sys/mount.h>

     getfsstat(struct statfs *buf, long bufsize, int flags);


     The getfsstat() system call returns information about all mounted file
     systems.  The buf argument is a pointer to statfs structures, as
     described in statfs(2).

     Fields that are undefined for a particular file system are set to -1.
     The buffer is filled with an array of statfs structures, one for each
     mounted file system up to the byte count specified by bufsize.  Note, the
     bufsize argument is the number of bytes that buf can hold, not the count
     of statfs structures it will hold.

     If buf is given as NULL, getfsstat() returns just the number of mounted
     file systems.

     Normally flags should be specified as MNT_WAIT.  If flags is set to
     MNT_NOWAIT, 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     information will be out of date, but getfsstat() will not block waiting
     for information from a file system that is unable to respond.


     Upon successful completion, the number of statfs structures is returned.
     Otherwise, -1 is returned and the global variable errno is set to
     indicate the error.


     The getfsstat() system call fails if one or more of the following are

     [EFAULT]           The buf argument points to an invalid address.

     [EIO]              An I/O error occurred while reading from or writing to
                        the file system.


     statfs(2), fstab(5), mount(8)


     The getfsstat() system call first appeared in 4.4BSD.