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Make the return types of 'read' and 'write' more useful.

    They return memory sizes, so do the right cast. Ugh.

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

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

@@ -377,8 +377,8 @@

 	const open	: (path:byte[:], opts:fdopt, mode:int64 -> int64)

 	const close	: (fd:int64 -> int64)

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

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

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

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

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

 	const lseek	: (fd:int64, off:uint64, whence:int64 -> int64)

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

 	const munmap	: (addr:byte*, len:size -> int64)

@@ -385,15 +385,15 @@

 	const mmap	: (addr:byte*, len:size, prot:mprot, flags:mopt, fd:int64, off:off -> byte*)

 ;;

-const exit	= {status;		syscall(Sysexit, 1);}

-const getpid	= {;			-> syscall(Sysgetpid, 1);}

-const kill	= {pid, sig;		-> syscall(Syskill, pid, sig);}

-const open	= {path, opts, mode;	-> syscall(Sysopen, cstring(path), opts, mode);}

-const close	= {fd;			-> syscall(Sysclose, fd);}

-const creat	= {path, mode;		-> syscall(Syscreat, cstring(path), mode);}

-const read	= {fd, buf;		-> syscall(Sysread, fd, buf castto(char*), buf.len);}

-const write	= {fd, buf;		-> syscall(Syswrite, fd, buf castto(char*), buf.len castto(size));}

-const lseek	= {fd, off, whence;	-> syscall(Syslseek, fd, off, whence);}

-const fstat	= {fd, sb;		-> syscall(Sysfstat, fd, sb);}

-const munmap	= {addr, len;		-> syscall(Sysmunmap, addr, len);}

-const mmap	= {addr, len, prot, flags, fd, off;	-> syscall(Sysmmap, addr, len, prot, flags, fd, off) castto(byte*);}

+const exit	= {status;		syscall(Sysexit, 1)}

+const getpid	= {;			-> syscall(Sysgetpid, 1)}

+const kill	= {pid, sig;		-> syscall(Syskill, pid, sig)}

+const open	= {path, opts, mode;	-> syscall(Sysopen, cstring(path), opts, mode)}

+const close	= {fd;			-> syscall(Sysclose, fd)}

+const creat	= {path, mode;		-> syscall(Syscreat, cstring(path), mode)}

+const read	= {fd, buf;		-> syscall(Sysread, fd, buf castto(char*), buf.len) castto(size)}

+const write	= {fd, buf;		-> syscall(Syswrite, fd, buf castto(char*), buf.len castto(size)) castto(size)}

+const lseek	= {fd, off, whence;	-> syscall(Syslseek, fd, off, whence)}

+const fstat	= {fd, sb;		-> syscall(Sysfstat, fd, sb)}

+const munmap	= {addr, len;		-> syscall(Sysmunmap, addr, len)}

+const mmap	= {addr, len, prot, flags, fd, off;	-> syscall(Sysmmap, addr, len, prot, flags, fd, off) castto(byte*)}