kern/169603: Possible r237738 libedit regression resizing windows in terminal programs

[Peter Jeremy]

I am seeing a similar problem with 9-stable/amd64 (r237995) - sh(1)
now exits if I change the window size (ssh'ing to the target system
within an xterm).

ktrace output looks like:
  1766 sh       GIO   fd 2 wrote 2 bytes
       "# "
  1766 sh       RET   write 2
  1766 sh       CALL  ioctl(0,TIOCGETA,0x801020364)
  1766 sh       RET   ioctl 0
  1766 sh       CALL  ioctl(0,TIOCSETAW,0x801020338)
  1766 sh       RET   ioctl 0
  1766 sh       CALL  read(0,0x7fffffffda8f,0x1)
  1766 sh       RET   read -1 errno 4 Interrupted system call
  1766 sh       PSIG  SIGWINCH caught handler=0x417d10 mask=0x0 code=0x10006
  1766 sh       CALL  sigreturn(0x7fffffffd600)
  1766 sh       RET   sigreturn JUSTRETURN
  1766 sh       CALL  ioctl(0,TIOCSETAW,0x80102030c)
  1766 sh       RET   ioctl 0
  1766 sh       CALL  setpgid(0,0x6e6)
  1766 sh       RET   setpgid -1 errno 1 Operation not permitted
  1766 sh       CALL  ioctl(0xa,TIOCSPGRP,0x7fffffffda74)
  1766 sh       RET   ioctl 0
  1766 sh       CALL  close(0xa)
  1766 sh       RET   close 0
  1766 sh       CALL  exit(0)

Reverting r237738 (the MFC of r237448), as suggested by pfg@, fixes the
problem.  Unfortunately this is quite a large commit and I haven't
looked into the specific change that breaks SIGWINCH handling.

-- 
Peter Jeremy
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