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uterm: fbdev: map FBs for read access

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We want to provide read-access to users of get_buffers() so map memory
with PROT_READ. However, read is almost always horribly slow so this
should only be used as fallback.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
This commit is contained in:
David Herrmann 2013-01-15 11:09:32 +01:00
parent 3eb9cc6f50
commit 2fd3afc10b
1 changed files with 1 additions and 1 deletions
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2
src/uterm_fbdev_video.c
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@ -298,7 +298,7 @@ static int display_activate_force(struct uterm_display *disp,
if (disp->flags & DISPLAY_DBUF) if (disp->flags & DISPLAY_DBUF)
len *= 2; len *= 2;
dfb->map = mmap(0, len, PROT_WRITE, MAP_SHARED, dfb->fd, 0); dfb->map = mmap(0, len, PROT_READ | PROT_WRITE, MAP_SHARED, dfb->fd, 0);
if (dfb->map == MAP_FAILED) { if (dfb->map == MAP_FAILED) {
log_error("cannot mmap device %s (%d): %m", dfb->node, log_error("cannot mmap device %s (%d): %m", dfb->node,
errno); errno);