155 lines
3.4 KiB
C
155 lines
3.4 KiB
C
/*
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* ustream - library for stream buffer management
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*
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* Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
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*
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* Permission to use, copy, modify, and/or 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 <unistd.h>
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#include <errno.h>
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#include <stdio.h>
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#include "ustream.h"
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static void ustream_fd_set_uloop(struct ustream *s)
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{
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struct ustream_fd *sf = container_of(s, struct ustream_fd, stream);
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struct ustream_buf *buf;
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unsigned int flags = ULOOP_EDGE_TRIGGER;
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if (!s->read_blocked && !s->eof)
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flags |= ULOOP_READ;
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buf = s->w.head;
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if (buf && s->w.data_bytes && !s->write_error)
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flags |= ULOOP_WRITE;
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uloop_fd_add(&sf->fd, flags);
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if (flags & ULOOP_READ)
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sf->fd.cb(&sf->fd, ULOOP_READ);
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}
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static void ustream_fd_read_pending(struct ustream_fd *sf, bool *more)
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{
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struct ustream *s = &sf->stream;
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int buflen = 0;
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ssize_t len;
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char *buf;
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do {
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buf = ustream_reserve(s, 1, &buflen);
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if (!buf)
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break;
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len = read(sf->fd.fd, buf, buflen);
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if (!len) {
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sf->fd.eof = true;
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return;
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}
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if (len < 0) {
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if (errno == EINTR)
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continue;
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if (errno == EAGAIN)
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return;
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}
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ustream_fill_read(s, len);
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*more = true;
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} while (1);
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}
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static int ustream_fd_write(struct ustream *s, const char *buf, int buflen, bool more)
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{
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struct ustream_fd *sf = container_of(s, struct ustream_fd, stream);
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ssize_t len;
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if (!buflen)
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return 0;
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retry:
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len = write(sf->fd.fd, buf, buflen);
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if (!len)
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goto retry;
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if (len < 0) {
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if (errno == EINTR)
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goto retry;
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if (errno == EAGAIN || errno == EWOULDBLOCK)
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return 0;
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}
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return len;
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}
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static bool __ustream_fd_poll(struct ustream_fd *sf, unsigned int events)
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{
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struct ustream *s = &sf->stream;
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struct uloop_fd *fd = &sf->fd;
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bool more = false;
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if (events & ULOOP_READ)
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ustream_fd_read_pending(sf, &more);
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if (events & ULOOP_WRITE) {
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if (!ustream_write_pending(s))
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ustream_fd_set_uloop(s);
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}
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if (!s->eof && fd->eof) {
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s->eof = true;
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ustream_fd_set_uloop(s);
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ustream_state_change(s);
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}
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return more;
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}
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static bool ustream_fd_poll(struct ustream *s)
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{
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struct ustream_fd *sf = container_of(s, struct ustream_fd, stream);
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return __ustream_fd_poll(sf, ULOOP_READ | ULOOP_WRITE);
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}
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static void ustream_uloop_cb(struct uloop_fd *fd, unsigned int events)
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{
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struct ustream_fd *sf = container_of(fd, struct ustream_fd, fd);
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__ustream_fd_poll(sf, events);
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}
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static void ustream_fd_free(struct ustream *s)
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{
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struct ustream_fd *sf = container_of(s, struct ustream_fd, stream);
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uloop_fd_delete(&sf->fd);
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}
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void ustream_fd_init(struct ustream_fd *sf, int fd)
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{
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struct ustream *s = &sf->stream;
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ustream_init_defaults(s);
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sf->fd.fd = fd;
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sf->fd.cb = ustream_uloop_cb;
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s->set_read_blocked = ustream_fd_set_uloop;
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s->write = ustream_fd_write;
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s->free = ustream_fd_free;
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s->poll = ustream_fd_poll;
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ustream_fd_set_uloop(s);
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}
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