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[PATCH] pipe: remove redundant fifo_poll abstraction 

Remove a redundant fifo_poll() abstraction from fs/pipe.c and adds a big
fat comment stating we set POLLERR for FIFOs too on Linux unlike most
Unices.

Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Cc: Manfred Spraul <manfred@colorfullife.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Pekka Enberg 2005-09-06 15:17:48 -07:00 committed by Linus Torvalds
parent 9c45817f41
commit 5e5d7a2229
1 changed files with 7 additions and 6 deletions
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13
fs/pipe.c
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@ -415,6 +415,10 @@ pipe_poll(struct file *filp, poll_table *wait)
if (filp->f_mode & FMODE_WRITE) {
mask |= (nrbufs < PIPE_BUFFERS) ? POLLOUT | POLLWRNORM : 0;
/*
* Most Unices do not set POLLERR for FIFOs but on Linux they
* behave exactly like pipes for poll().
*/
if (!PIPE_READERS(*inode))
mask |= POLLERR;
}
@ -422,9 +426,6 @@ pipe_poll(struct file *filp, poll_table *wait)
return mask;
}
/* FIXME: most Unices do not set POLLERR for fifos */
#define fifo_poll pipe_poll
static int
pipe_release(struct inode *inode, int decr, int decw)
{
@ -568,7 +569,7 @@ struct file_operations read_fifo_fops = {
.read = pipe_read,
.readv = pipe_readv,
.write = bad_pipe_w,
.poll = fifo_poll,
.poll = pipe_poll,
.ioctl = pipe_ioctl,
.open = pipe_read_open,
.release = pipe_read_release,
@ -580,7 +581,7 @@ struct file_operations write_fifo_fops = {
.read = bad_pipe_r,
.write = pipe_write,
.writev = pipe_writev,
.poll = fifo_poll,
.poll = pipe_poll,
.ioctl = pipe_ioctl,
.open = pipe_write_open,
.release = pipe_write_release,
@ -593,7 +594,7 @@ struct file_operations rdwr_fifo_fops = {
.readv = pipe_readv,
.write = pipe_write,
.writev = pipe_writev,
.poll = fifo_poll,
.poll = pipe_poll,
.ioctl = pipe_ioctl,
.open = pipe_rdwr_open,
.release = pipe_rdwr_release,