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  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   This  System-V  derived  system  call  is  obsolete;  don't use it.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 4.09 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/.

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