focal (2) sysfs.2.gz

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

       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 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       This System-V derived system call is obsolete; don't use it.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 5.05 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/.