getfsstat(2)

NAME

getfsstat - get list of all mounted file systems

LIBRARY

Standard C Library (libc, -lc)

SYNOPSIS

#include <sys/param.h>
#include <sys/ucred.h>
#include <sys/mount.h>
int
getfsstat(struct statfs *buf, long bufsize, int flags);

DESCRIPTION

The getfsstat() system call returns information about all

mounted file
systems. The buf argument is a pointer to statfs struc

tures, 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 fsstat 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information will be out of date, but getfsstat() will not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 re

spond.

RETURN VALUES

Upon successful completion, the number of fsstat structures

is returned.
Otherwise, -1 is returned and the global variable errno is

set to indicate the error.

ERRORS

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

lowing are
true:

[EFAULT] The buf argument points to an invalid ad

dress.

[EIO] An I/O error occurred while reading from

or writing to

the file system.

SEE ALSO

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

HISTORY

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

BSD November 20, 2003

BSD