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hyc@symas.com 26df6d1340 tty: Add EXTPROC support for LINEMODE 
This patch is against the 2.6.34 source.

Paraphrased from the 1989 BSD patch by David Borman @ cray.com:

     These are the changes needed for the kernel to support
     LINEMODE in the server.

     There is a new bit in the termios local flag word, EXTPROC.
     When this bit is set, several aspects of the terminal driver
     are disabled.  Input line editing, character echo, and mapping
     of signals are all disabled.  This allows the telnetd to turn
     off these functions when in linemode, but still keep track of
     what state the user wants the terminal to be in.

     New ioctl:
         TIOCSIG         Generate a signal to processes in the
                         current process group of the pty.

     There is a new mode for packet driver, the TIOCPKT_IOCTL bit.
     When packet mode is turned on in the pty, and the EXTPROC bit
     is set, then whenever the state of the pty is changed, the
     next read on the master side of the pty will have the TIOCPKT_IOCTL
     bit set.  This allows the process on the server side of the pty
     to know when the state of the terminal has changed; it can then
     issue the appropriate ioctl to retrieve the new state.

Since the original BSD patches accompanied the source code for telnet
I've left that reference here, but obviously the feature is useful for
any remote terminal protocol, including ssh.

The corresponding feature has existed in the BSD tty driver since 1989.
For historical reference, a good copy of the relevant files can be found
here:

http://anonsvn.mit.edu/viewvc/krb5/trunk/src/appl/telnet/?pathrev=17741

Signed-off-by: Howard Chu <hyc@symas.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
 		2010-08-10 13:47:39 -07:00
..
Kbuild Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
asm-offsets.h kbuild: move asm-offsets.h to include/generated 2009-12-12 13:08:14 +01:00
atomic.h mn10300: use generic atomic.h 2010-05-25 08:07:02 -07:00
auxvec.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
bitops.h mn10300: add cc clobbers to asm statements 2010-01-11 09:34:10 -08:00
bitsperlong.h asm-generic: introduce asm/bitsperlong.h 2009-06-11 21:02:14 +02:00
bug.h MN10300: Stop gcc from generating uninitialised variable warnings after BUG() 2009-04-15 13:55:13 -07:00
bugs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
busctl-regs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
byteorder.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
cache.h mn10300: set ARCH_KMALLOC_MINALIGN 2010-05-25 08:07:02 -07:00
cacheflush.h block: add helpers to run flush_dcache_page() against a bio and a request's pages 2009-11-26 09:16:19 +01:00
checksum.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
cpu-regs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
cputime.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
current.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
delay.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
device.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
div64.h mn10300: add cc clobbers to asm statements 2010-01-11 09:34:10 -08:00
dma-mapping.h dma-mapping: mn10300: remove the obsolete and unnecessary DMA API comments 2010-03-12 15:52:42 -08:00
dma.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
dmactl-regs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
elf.h elf: kill USE_ELF_CORE_DUMP 2009-12-16 07:20:12 -08:00
emergency-restart.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
errno.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
exceptions.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
fb.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
fcntl.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
fpu.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
frame.inc Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
ftrace.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
futex.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
gdb-stub.h misc: remove redundant start_kernel prototypes 2009-09-23 10:05:22 -07:00
hardirq.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
highmem.h kmap_atomic: make kunmap_atomic() harder to misuse 2010-08-09 20:44:54 -07:00
hw_irq.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
intctl-regs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
io.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
ioctl.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
ioctls.h tty: Add EXTPROC support for LINEMODE 2010-08-10 13:47:39 -07:00
ipc.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
ipcbuf.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
irq.h Separate out the proc- and unit-specific header directories from the general 2009-04-10 14:33:48 +01:00
irq_regs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
kdebug.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
kmap_types.h kmap_types: make most arches use generic header file 2009-06-16 19:47:51 -07:00
kprobes.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
linkage.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
local.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
local64.h arch: Implement local64_t 2010-06-09 11:12:36 +02:00
mc146818rtc.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
mman.h arch_mmap_check() on mn10300 2009-12-11 06:34:10 -05:00
mmu.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
mmu_context.h cpumask: use mm_cpumask() wrapper: mn10300 2009-09-24 09:34:50 +09:30
module.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
msgbuf.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
mutex.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
nmi.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
page.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
page_offset.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
param.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
pci.h PCI: remove pcibios_scan_all_fns() 2009-09-09 13:29:18 -07:00
percpu.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
pgalloc.h mm: Pass virtual address to [__]p{te,ud,md}_free_tlb() 2009-07-27 12:10:38 -07:00
pgtable.h MM: Pass a PTE pointer to update_mmu_cache() rather than the PTE itself 2010-02-20 16:41:46 +00:00
pio-regs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
poll.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
posix_types.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
processor.h MN10300: Add utrace/tracehooks support 2009-06-11 09:02:20 -07:00
ptrace.h ptrace: move user_enable_single_step & co prototypes to linux/ptrace.h 2010-03-12 15:52:38 -08:00
reset-regs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
resource.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
rtc-regs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
rtc.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
scatterlist.h mn10300: use asm-generic/scatterlist.h 2010-05-27 09:12:55 -07:00
sections.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
sembuf.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
serial-regs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
serial.h Separate out the proc- and unit-specific header directories from the general 2009-04-10 14:33:48 +01:00
setup.h headers_check fix: mn10300, setup.h 2009-06-14 11:51:12 +05:30
shmbuf.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
shmparam.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
sigcontext.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
siginfo.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
signal.h asm-generic: rename termios.h, signal.h and mman.h 2009-06-11 21:01:52 +02:00
smp.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
socket.h net: Generalize socket rx gap / receive queue overflow cmsg 2009-10-12 13:26:31 -07:00
sockios.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
spinlock.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
stat.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
statfs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
string.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
swab.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
system.h mn10300: add cc clobbers to asm statements 2010-01-11 09:34:10 -08:00
termbits.h tty: Add EXTPROC support for LINEMODE 2010-08-10 13:47:39 -07:00
termios.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
thread_info.h add descriptive comment for TIF_MEMDIE task flag declaration. 2010-05-14 11:13:27 +02:00
timer-regs.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
timex.h Separate out the proc- and unit-specific header directories from the general 2009-04-10 14:33:48 +01:00
tlb.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
tlbflush.h mn10300: add cc clobbers to asm statements 2010-01-11 09:34:10 -08:00
topology.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
types.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
uaccess.h mn10300: add cc clobbers to asm statements 2010-01-11 09:34:10 -08:00
ucontext.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
unaligned.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
unistd.h Add generic sys_ipc wrapper 2010-03-12 15:52:32 -08:00
user.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
vga.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00
xor.h Move arch headers from include/asm-mn10300/ to arch/mn10300/include/asm/. 2009-04-10 14:19:03 +01:00