litmus-rt.git - The LITMUS^RT kernel.

The LITMUS^RT kernel.

Bjoern Brandenburg

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author	Linus Torvalds <torvalds@woody.linux-foundation.org>	2007-09-24 20:33:10 -0400
committer	Linus Torvalds <torvalds@woody.linux-foundation.org>	2007-09-24 20:33:10 -0400
commit	4942de4a0e914f205d351a81873f4f63986bcc3c (patch)
tree	1f90a6eeca36f5e758a162371bf17714fe9d6fbb /include/asm-m68k/cache.h
parent	e0b9d139f2595fafbe95fcb7b40109db724900e8 (diff)

Linux 2.6.23-rc8v2.6.23-rc8

Getting there...

Diffstat (limited to 'include/asm-m68k/cache.h')

0 files changed, 0 insertions, 0 deletions

pan class="hl opt">} filp->f_version = 0; /* We can only do regular read/write on fifos */ filp->f_mode &= (FMODE_READ | FMODE_WRITE); switch (filp->f_mode) { case FMODE_READ: /* * O_RDONLY * POSIX.1 says that O_NONBLOCK means return with the FIFO * opened, even when there is no process writing the FIFO. */ filp->f_op = &read_pipefifo_fops; pipe->r_counter++; if (pipe->readers++ == 0) wake_up_partner(inode); if (!pipe->writers) { if ((filp->f_flags & O_NONBLOCK)) { /* suppress POLLHUP until we have * seen a writer */ filp->f_version = pipe->w_counter; } else { wait_for_partner(inode, &pipe->w_counter); if(signal_pending(current)) goto err_rd; } } break; case FMODE_WRITE: /* * O_WRONLY * POSIX.1 says that O_NONBLOCK means return -1 with * errno=ENXIO when there is no process reading the FIFO. */ ret = -ENXIO; if ((filp->f_flags & O_NONBLOCK) && !pipe->readers) goto err; filp->f_op = &write_pipefifo_fops; pipe->w_counter++; if (!pipe->writers++) wake_up_partner(inode); if (!pipe->readers) { wait_for_partner(inode, &pipe->r_counter); if (signal_pending(current)) goto err_wr; } break; case FMODE_READ | FMODE_WRITE: /* * O_RDWR * POSIX.1 leaves this case "undefined" when O_NONBLOCK is set. * This implementation will NEVER block on a O_RDWR open, since * the process can at least talk to itself. */ filp->f_op = &rdwr_pipefifo_fops; pipe->readers++; pipe->writers++; pipe->r_counter++; pipe->w_counter++; if (pipe->readers == 1 || pipe->writers == 1) wake_up_partner(inode); break; default: ret = -EINVAL; goto err; } /* Ok! */ mutex_unlock(&inode->i_mutex); return 0; err_rd: if (!--pipe->readers) wake_up_interruptible(&pipe->wait); ret = -ERESTARTSYS; goto err; err_wr: if (!--pipe->writers) wake_up_interruptible(&pipe->wait); ret = -ERESTARTSYS; goto err; err: if (!pipe->readers && !pipe->writers) free_pipe_info(inode); err_nocleanup: mutex_unlock(&inode->i_mutex); return ret; } /* * Dummy default file-operations: the only thing this does * is contain the open that then fills in the correct operations * depending on the access mode of the file... */ const struct file_operations def_fifo_fops = { .open = fifo_open, /* will set read_ or write_pipefifo_fops */ };


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