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Add getdents function to linux.

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

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

@@ -64,6 +64,13 @@

 		 ino		: uint64

 	;;

+	type dirent = struct

+		ino	: uint64

+		off	: uint64

+		reclen	: uint16

+		name	: byte[0]

+	;;

+

 	type utsname = struct

 		system	: byte[65]

 		node	: byte[65]

@@ -485,6 +492,7 @@

 	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)

 	/* networking */

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

@@ -583,6 +591,7 @@

 	(arg, ap) = vanext(ap)

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

 }

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

 /* networking */

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