qemu-char: Inherit ptys and improve output from -serial pty
Changes since V1: - Avoid crashing since qemu_opts_id() may return null on some systems according to Markus's suggestion. When controlling a qemu instance from another program, it's hard to know which serial port or monitor device is redirected to which pty. With more than one device using "pty" a lot of guesswork is involved. $ ./x86_64-softmmu/qemu-system-x86_64 -serial pty -serial pty -monitor pty char device redirected to /dev/pts/5 char device redirected to /dev/pts/6 char device redirected to /dev/pts/7 Although we can find out what everything else is connected to by the "info chardev" with "-monitor stdio" in the command line, It'd be very useful to be able to have qemu inherit pseudo-tty file descriptors so they could just be specified on the command line like: $ ./x86_64-softmmu/qemu-system-x86_64 -serial pty -serial pty -monitor pty char device compat_monitor0 redirected to /dev/pts/5 char device serial0 redirected to /dev/pts/6 char device serial1 redirected to /dev/pts/7 Referred link: https://bugs.launchpad.net/qemu/+bug/938552Signed-off-by: NLei Li <lilei@linux.vnet.ibm.com> Signed-off-by: NAnthony Liguori <aliguori@us.ibm.com>
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