sysfs man page on Archlinux

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

       sysfs - get filesystem type information

       int sysfs(int option, const char *fsname);

       int sysfs(int option, unsigned int fs_index, char *buf);

       int sysfs(int option);

       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  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

       The numbering of the filesystem type indexes begins with zero.

       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.

       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.


       This  System-V  derived system call is obsolete; don't use it.  On sys‐
       tems  with  /proc,  the	same   information   can   be	obtained   via
       /proc/filesystems; use that interface instead.

       There  is no libc or glibc support.  There is no way to guess how large
       buf should be.

       This page is part of release 3.65 of the Linux  man-pages  project.   A
       description  of	the project, and information about reporting bugs, can
       be found at

Linux				  2010-06-27			      SYSFS(2)

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