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Fix getdents() syscall.

--- a/libstd/sys-linux.myr

+++ b/libstd/sys-linux.myr

@@ -64,10 +64,11 @@

 		 ino		: uint64

 	;;

-	type dirent = struct

+	type dirent64 = struct

 		ino	: uint64

 		off	: uint64

 		reclen	: uint16

+		etype	: byte

 		name	: byte[0]

 	;;

@@ -107,6 +108,7 @@

 	const Onofollow	: fdopt = 0x20000

 	const Ondelay  	: fdopt = 0x800

 	const Otrunc   	: fdopt = 0x200

+	const Odir	: fdopt = 0x10000

 	/* mmap protection */

 	const Mprotnone	: mprot = 0x0

@@ -492,7 +494,7 @@

 	const fstat	: (fd:fd, sb:statbuf# -> int64)

 	const mkdir	: (path : byte[:], mode : int64	-> int64)

 	const ioctl	: (fd:fd, req : int64, args:... -> int64)

-	const getdents64	: (fd:fd, dent : dirent#, count : uint64 -> int64)

+	const getdents64	: (fd:fd, buf : byte[:] -> int64)

 	/* networking */

 	const socket	: (dom : sockfam, stype : socktype, proto : sockproto	-> fd)

@@ -591,7 +593,7 @@

 	(arg, ap) = vanext(ap)

 	-> syscall(Sysioctl, fd, req, arg) castto(int64)

 }

-const getdents64	= {fd, dent, count;	-> syscall(Sysgetdents64, fd, dent, count)}

+const getdents64	= {fd, buf;	-> syscall(Sysgetdents64, fd, buf castto(byte#), buf.len)}

 /* networking */

 const socket	= {dom, stype, proto;	-> syscall(Syssocket, dom castto(int64), stype, proto) castto(fd)}