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setconsole: open console for writing rather than reading

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The console passed to TIOCCONS has to be writable, otherwise future
console writes will fail.

This presumably used to work, but in current kernels (see
drivers/tty/tty_io.c:redirected_tty_write) console writes are sent to
vfs_write(device), which checks if the device is writable. A quick look
in the linux git history doesn't show any recent changes to either tty_io
or vfs_write.

Signed-off-by: Peter Korsgaard <jacmet@sunsite.dk>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Peter Korsgaard 2011-05-26 17:51:37 +02:00 committed by Denys Vlasenko
parent abb0952e63
commit 8dc6195c97
1 changed files with 1 additions and 1 deletions
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2
console-tools/setconsole.c
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@ -41,6 +41,6 @@ int setconsole_main(int argc UNUSED_PARAM, char **argv)
device = DEV_CONSOLE;
}
xioctl(xopen(device, O_RDONLY), TIOCCONS, NULL);
xioctl(xopen(device, O_WRONLY), TIOCCONS, NULL);
return EXIT_SUCCESS;
}