NAME
sysfs - get file system type information
SYNOPSIS
I int sysfs(int option , const char * fsname );
I int sysfs(int option , unsigned int fs_index , char * buf );
I int sysfs(int option );
DESCRIPTION
R sysfs ()
returns information about the file system types currently present in
the kernel.
The specific form of the
R sysfs ()
call and the information returned depends on the
option
in effect:
1
Translate the file-system identifier string
fsname
into a file-system type index.
2
Translate the file-system type index
fs_index
into a null-terminated file-system identifier string.
This string will
be written to the buffer pointed to by
R buf .
Make sure that
buf
has enough space to accept the string.
3
Return the total number of file system types currently present in the
kernel.
The numbering of the file-system type indexes begins with zero.
RETURN VALUE
On success,
R sysfs ()
returns the file-system index for option
R 1 ,
zero for option
R 2 ,
and the number of currently configured file systems for option
R 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 file-system type identifier;
fs_index
is out-of-bounds;
option
is invalid.
CONFORMING TO
SVr4.
NOTES
On Linux with the
proc
filesystem mounted on
R /proc ,
the same information can be derived from
R /proc/filesystems .
BUGS
There is no libc or glibc support.
There is no way to guess how large buf should be.
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