NAME

       sysfs - get filesystem type information

SYNOPSIS

       [[deprecated]] int sysfs(int option, const char *fsname);
       [[deprecated]] int sysfs(int option, unsigned int fs_index, char *buf);
       [[deprecated]] int sysfs(int option);

DESCRIPTION

       Note: if you are looking for information about the sysfs filesystem that is normally mounted at /sys, see
       sysfs(5).

       The  (obsolete)  sysfs()  system call 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  to  indicate
       the error.

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.

STANDARDS

       None.

HISTORY

       SVr4.

       This System-V derived system call is obsolete; don't use it.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

BUGS

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

SEE ALSO

       proc(5), sysfs(5)

Linux man-pages 6.7                                2023-10-31                                           sysfs(2)