SYSFS
Section: Linux Programmer's Manual (2)
Updated: 2017-09-15
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NAME
sysfs - get filesystem type information
SYNOPSIS
int sysfs(int option, const char *fsname);
int sysfs(int option, unsigned int fs_index, char *buf);
int sysfs(int option);
DESCRIPTION
Note:
if you are looking for information about the
sysfs
filesystem that is normally mounted at
/sys,
see
sysfs(5).
The (obsolete)
sysfs()
system call returns information about the filesystem types
currently present in the kernel.
The specific form of the
sysfs()
call and the information returned depends on the
option
in effect:
- 1
-
Translate the filesystem identifier string
fsname
into a filesystem type index.
- 2
-
Translate the filesystem type index
fs_index
into a null-terminated filesystem identifier string.
This string will
be written to the buffer pointed to by
buf.
Make sure that
buf
has enough space to accept the string.
- 3
-
Return the total number of filesystem types currently present in the
kernel.
The numbering of the filesystem type indexes begins with zero.
RETURN VALUE
On success,
sysfs()
returns the filesystem index for option
1,
zero for option
2,
and the number of currently configured filesystems for option
3.
On error, -1 is returned, and
errno
is set appropriately.
ERRORS
- EFAULT
-
Either fsname or buf
is outside your accessible address space.
- EINVAL
-
fsname
is not a valid filesystem type identifier;
fs_index
is out-of-bounds;
option
is invalid.
CONFORMING TO
SVr4.
NOTES
This System-V derived system call is obsolete; don't use it.
On systems with
/proc,
the same information can be obtained via
/proc/filesystems;
use that interface instead.
BUGS
There is no libc or glibc support.
There is no way to guess how large
buf should be.
COLOPHON
This page is part of release 4.13 of the Linux
man-pages
project.
A description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
https://www.kernel.org/doc/man-pages/.
Index
- NAME
-
- SYNOPSIS
-
- DESCRIPTION
-
- RETURN VALUE
-
- ERRORS
-
- CONFORMING TO
-
- NOTES
-
- BUGS
-
- COLOPHON
-
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