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Linux 2.6 - man page for sysfs (linux section 2)

SYSFS(2)			    Linux Programmer's Manual				 SYSFS(2)

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
       sysfs()	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 identi-
	  fier 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       This System-V derived system call is obsolete; don't use it.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 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

Linux					    2010-06-27					 SYSFS(2)


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