mirror of
https://github.com/ericonr/sndio.git
synced 2024-02-18 04:45:21 -06:00
193 lines
3.6 KiB
C
193 lines
3.6 KiB
C
/*
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* Copyright (c) 2008 Alexandre Ratchov <alex@caoua.org>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/time.h>
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#include <sys/types.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <poll.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include "conf.h"
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#include "pipe.h"
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#ifdef DEBUG
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#include "dbg.h"
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#endif
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struct fileops pipe_ops = {
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"pipe",
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sizeof(struct pipe),
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pipe_close,
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pipe_read,
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pipe_write,
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NULL, /* start */
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NULL, /* stop */
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pipe_nfds,
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pipe_pollfd,
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pipe_revents
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};
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struct pipe *
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pipe_new(struct fileops *ops, int fd, char *name)
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{
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struct pipe *f;
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f = (struct pipe *)file_new(ops, name, 1);
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if (f == NULL)
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return NULL;
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f->fd = fd;
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return f;
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}
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unsigned
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pipe_read(struct file *file, unsigned char *data, unsigned count)
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{
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struct pipe *f = (struct pipe *)file;
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int n;
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while ((n = read(f->fd, data, count)) < 0) {
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f->file.state &= ~FILE_ROK;
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if (errno == EAGAIN) {
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#ifdef DEBUG
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if (debug_level >= 4) {
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file_dbg(&f->file);
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dbg_puts(": reading blocked\n");
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}
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#endif
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} else {
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warn("%s", f->file.name);
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file_eof(&f->file);
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}
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return 0;
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}
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if (n == 0) {
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f->file.state &= ~FILE_ROK; /* XXX: already cleared in file_eof */
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file_eof(&f->file);
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return 0;
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}
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return n;
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}
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unsigned
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pipe_write(struct file *file, unsigned char *data, unsigned count)
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{
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struct pipe *f = (struct pipe *)file;
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int n;
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while ((n = write(f->fd, data, count)) < 0) {
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f->file.state &= ~FILE_WOK;
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if (errno == EAGAIN) {
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#ifdef DEBUG
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if (debug_level >= 4) {
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file_dbg(&f->file);
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dbg_puts(": writing blocked\n");
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}
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#endif
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} else {
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if (errno != EPIPE)
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warn("%s", f->file.name);
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file_hup(&f->file);
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}
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return 0;
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}
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return n;
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}
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int
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pipe_nfds(struct file *file) {
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return 1;
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}
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int
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pipe_pollfd(struct file *file, struct pollfd *pfd, int events)
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{
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struct pipe *f = (struct pipe *)file;
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pfd->fd = f->fd;
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pfd->events = events;
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return (events != 0) ? 1 : 0;
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}
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int
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pipe_revents(struct file *f, struct pollfd *pfd)
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{
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return pfd->revents;
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}
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void
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pipe_close(struct file *file)
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{
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struct pipe *f = (struct pipe *)file;
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close(f->fd);
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}
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off_t
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pipe_endpos(struct file *file)
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{
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struct pipe *f = (struct pipe *)file;
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off_t pos;
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pos = lseek(f->fd, 0, SEEK_END);
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if (pos < 0) {
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#ifdef DEBUG
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file_dbg(&f->file);
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dbg_puts(": couldn't get file size\n");
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#endif
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return 0;
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}
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return pos;
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}
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int
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pipe_seek(struct file *file, off_t pos)
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{
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struct pipe *f = (struct pipe *)file;
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off_t newpos;
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newpos = lseek(f->fd, pos, SEEK_SET);
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if (newpos < 0) {
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#ifdef DEBUG
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file_dbg(&f->file);
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dbg_puts(": couldn't seek\n");
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#endif
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/* XXX: call eof() */
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return 0;
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}
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return 1;
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}
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int
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pipe_trunc(struct file *file, off_t pos)
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{
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struct pipe *f = (struct pipe *)file;
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if (ftruncate(f->fd, pos) < 0) {
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#ifdef DEBUG
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file_dbg(&f->file);
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dbg_puts(": couldn't truncate file\n");
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#endif
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/* XXX: call hup() */
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return 0;
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}
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return 1;
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}
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