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SYSFS(2)                   Linux Programmer's ManualSYSFS(2)NAME       sysfs - get filesystem type informationSYNOPSIS       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, seesysfs(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             out-of-bounds; option is invalid.CONFORMING TO       SVr4.NOTES       This  System-V  derived system call is obsolete; don't use it.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 sys-       tems  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/.Linux                             2017-09-15SYSFS(2)