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c59dbcadd5
The previous console cleanup patch switched generic_read and generic_write
from calling os_{read,write}_file to calling read and write directly. Because
the calling convention is different, they now need to get any error from errno
rather than the return value. I did this for generic_read, but forgot about
generic_write.
While chasing some output corruption, I noticed that line_write was
unnecessarily calling flush_buffer, and deleted it. I don't understand why,
but the corruption disappeared. This is unneeded because there already is a
perfectly good mechanism for finding out when the host output device has some
room to write data - there is an interrupt that comes in when writes can
happen again. line_write calling flush_buffer seemed to just be an attempt to
opportunistically get some data out to the host.
I also made write_chan short-circuit calling into the host-level code for
zero-length writes. Calling libc write with a length of zero conflated write
not being able to write anything with asking it not to write anything. Better
to just cut it off as soon as possible.
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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|---|---|---|
| .. | ||
| chan_kern.c | ||
| chan_user.c | ||
| cow.h | ||
| cow_sys.h | ||
| cow_user.c | ||
| daemon.h | ||
| daemon_kern.c | ||
| daemon_user.c | ||
| fd.c | ||
| harddog_kern.c | ||
| harddog_user.c | ||
| hostaudio_kern.c | ||
| line.c | ||
| Makefile | ||
| mcast.h | ||
| mcast_kern.c | ||
| mcast_user.c | ||
| mconsole_kern.c | ||
| mconsole_user.c | ||
| mmapper_kern.c | ||
| net_kern.c | ||
| net_user.c | ||
| null.c | ||
| pcap_kern.c | ||
| pcap_user.c | ||
| pcap_user.h | ||
| port.h | ||
| port_kern.c | ||
| port_user.c | ||
| pty.c | ||
| random.c | ||
| slip.h | ||
| slip_common.c | ||
| slip_common.h | ||
| slip_kern.c | ||
| slip_user.c | ||
| slirp.h | ||
| slirp_kern.c | ||
| slirp_user.c | ||
| ssl.c | ||
| ssl.h | ||
| stderr_console.c | ||
| stdio_console.c | ||
| stdio_console.h | ||
| tty.c | ||
| ubd_kern.c | ||
| ubd_user.c | ||
| xterm.c | ||
| xterm.h | ||
| xterm_kern.c | ||