4.2BSD signal(2) replacement

[gwyn%brl-vgr at sri-unix.UUCP]

From:      Doug Gwyn (VLD/VMB) <gwyn at brl-vgr>

I have made a minor change in the signal(2) routine I posted a couple
of days ago, to eliminate the possibility of EINTR being returned for
system calls that aren't supposed to return that errno.  Anyone who
wants a fresh copy, mail me a note.  (All I did was check the bytes
after the CHMK to ensure it was a read, write, ioctl, wait, readv,
or writev syscall.)