NAME
getfsstat —
get list of all mounted file
systems
LIBRARY
library “libc”
SYNOPSIS
#include
<sys/param.h>
#include <sys/ucred.h>
#include <sys/mount.h>
int
getfsstat(struct
statfs *buf, long
bufsize, int
mode);
DESCRIPTION
Thegetfsstat()
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 mode should be
specified as MNT_WAIT. If mode
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 Thus, some of the information will be out of date,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. It will also skip
any file system that is in the process of being unmounted, even if the
unmount would eventually fail.
RETURN VALUES
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.
ERRORS
The getfsstat() system call fails if one
or more of the following are true:
- [
EFAULT] - The buf argument points to an invalid address.
- [
EINVAL] - mode is set to a value other than
MNT_WAITorMNT_NOWAIT. - [
EIO] - An I/O error occurred while reading from or writing to the file system.
SEE ALSO
HISTORY
The getfsstat() system call first appeared
in 4.4BSD.