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Man Pages


Manual Reference Pages  -  GETFSSTAT (2)

NAME

getfsstat - get list of all mounted file systems

CONTENTS

Library
Synopsis
Description
Return Values
Errors
See Also
History

LIBRARY


.Lb libc

SYNOPSIS


.In sys/param.h
.In sys/ucred.h
.In 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
.Vt 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 Thus, some of the information will be out of date, but getfsstat will not block waiting for information from a file system that is unable to respond.

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.
[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 BSD 4.4 .
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