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



NAME
       sysfs - get file system 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  file  system  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 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 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, sysfs() returns the file-system index for option 1, zero for option 2, and the number of currently configured
       file systems 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 file-system type identifier; fs_index is out-of-bounds; option is invalid.

CONFORMING TO
       SVr4.

NOTES
       On Linux with the proc file system mounted on /proc, the same information can be derived from /proc/filesystems.

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 3.25 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                                                      1995-08-09                                                   SYSFS(2)