/*

 * POSIX library for Lua 5.1, 5.2 & 5.3.

 * (c) Gary V. Vaughan <gary@vaughan.pe>, 2013-2015

 * (c) Reuben Thomas <rrt@sc3d.org> 2010-2013

 * (c) Natanael Copa <natanael.copa@gmail.com> 2008-2010

 * Clean up and bug fixes by Leo Razoumov <slonik.az@gmail.com> 2006-10-11

 * Luiz Henrique de Figueiredo <lhf@tecgraf.puc-rio.br> 07 Apr 2006 23:17:49

 * Based on original by Claudio Terra for Lua 3.x.

 * With contributions by Roberto Ierusalimschy.

 * With documentation from Steve Donovan 2012

 */

/***

 Retrieve File System Information.

 Where supported by the underlying system, query the file system.  If the

 module loads, but there is no kernel support, then `posix.sys.statvfs.version`

 will be set, but the unsupported APIs will be `nil`.

@module posix.sys.statvfs

*/

#include <config.h>

#if defined HAVE_STATVFS

#include <sys/statvfs.h>

#include "_helpers.c"

/***

Files system information record.

@table PosixStatvfs

@int f_bsize file system block size

@int f_frsize fundamental file system block size

@int f_blocks number of *f_frsize* sized blocks in file system

@int f_bfree number of free blocks

@int f_bavail number of free blocks available to non-privileged process

@int f_files number of file serial numbers

@int f_ffree number of free file serial numbers

@int f_favail number of free file serial numbers available

@int f_fsid file system id

@int f_flag flag bits

@int f_namemax maximum filename length

*/

static int

pushstatvfs(lua_State *L, struct statvfs *sv)

{

	if (!sv)

		return lua_pushnil(L), 1;

	lua_createtable(L, 0, 11);

	setintegerfield(sv, f_bsize);

	setintegerfield(sv, f_frsize);

	setintegerfield(sv, f_blocks);

	setintegerfield(sv, f_bfree);

	setintegerfield(sv, f_bavail);

	setintegerfield(sv, f_files);

	setintegerfield(sv, f_ffree);

	setintegerfield(sv, f_favail);

	setintegerfield(sv, f_fsid);

	setintegerfield(sv, f_flag);

	setintegerfield(sv, f_namemax);

	settypemetatable("PosixStatvfs");

	return 1;

}

/***

Get file system statistics.

@function statvfs

@string path any path within the mounted file system

@treturn PosixStatvfs information about file system containing *path*

@see statvfs(3)

@usage for a, b in pairs (P.statvfs "/") do print (a, b) end

*/

static int

Pstatvfs(lua_State *L)

{

	struct statvfs s;

	const char *path = luaL_checkstring(L, 1);

	checknargs(L, 1);

	if (statvfs(path, &s) == -1)

		return pusherror(L, path);

	return pushstatvfs(L, &s);

}

static const luaL_Reg posix_sys_statvfs_fns[] =

{

	LPOSIX_FUNC( Pstatvfs		),

	{NULL, NULL}

};

/***

Constants.

@section constants

*/

/***

Statvfs constants.

Any constants not available in the underlying system will be `nil` valued.

@table posix.sys.statvfs

@int ST_RDONLY read-only file system

@int ST_NOSUID does not support `S_ISUID` nor `S_ISGID` file mode bits

@usage

  -- Print statvfs constants supported on this host.

  for name, value in pairs (require "posix.sys.statvfs") do

    if type (value) == "number" then

      print (name, value)

     end

  end

*/

LUALIB_API int

luaopen_posix_sys_statvfs(lua_State *L)

{

	luaL_register(L, "posix.sys.statvfs", posix_sys_statvfs_fns);

	lua_pushliteral(L, "posix.sys.statvfs for " LUA_VERSION " / " PACKAGE_STRING);

	lua_setfield(L, -2, "version");

	LPOSIX_CONST( ST_RDONLY		);

	LPOSIX_CONST( ST_NOSUID		);

	return 1;

}

#endif