Mirror of the official OpenWrt libubox repository https://git.openwrt.org/project/libubox
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/*
* ustream - library for stream buffer management
*
* Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
*
* Permission to use, copy, modify, and/or distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <unistd.h>
#include <errno.h>
#include <stdio.h>
#include "ustream.h"
static void ustream_fd_set_uloop(struct ustream *s, bool write)
{
struct ustream_fd *sf = container_of(s, struct ustream_fd, stream);
struct ustream_buf *buf;
unsigned int flags = ULOOP_EDGE_TRIGGER | ULOOP_ERROR_CB;
if (!s->read_blocked && !s->eof)
flags |= ULOOP_READ;
buf = s->w.head;
if (write || (buf && s->w.data_bytes && !s->write_error))
flags |= ULOOP_WRITE;
uloop_fd_add(&sf->fd, flags);
}
static void ustream_fd_set_read_blocked(struct ustream *s)
{
ustream_fd_set_uloop(s, false);
}
static void ustream_fd_read_pending(struct ustream_fd *sf, bool *more)
{
struct ustream *s = &sf->stream;
int buflen = 0;
ssize_t len;
char *buf;
do {
if (s->read_blocked)
break;
buf = ustream_reserve(s, 1, &buflen);
if (!buf)
break;
len = read(sf->fd.fd, buf, buflen);
if (len < 0) {
if (errno == EINTR)
continue;
if (errno == EAGAIN || errno == ENOTCONN)
return;
len = 0;
}
if (!len) {
if (!s->eof)
ustream_state_change(s);
s->eof = true;
ustream_fd_set_uloop(s, false);
return;
}
ustream_fill_read(s, len);
*more = true;
} while (1);
}
static int ustream_fd_write(struct ustream *s, const char *buf, int buflen, bool more)
{
struct ustream_fd *sf = container_of(s, struct ustream_fd, stream);
ssize_t ret = 0, len;
if (!buflen)
return 0;
while (buflen) {
len = write(sf->fd.fd, buf, buflen);
if (len < 0) {
if (errno == EINTR)
continue;
if (errno == EAGAIN || errno == EWOULDBLOCK || errno == ENOTCONN)
break;
return -1;
}
ret += len;
buf += len;
buflen -= len;
}
if (buflen)
ustream_fd_set_uloop(s, true);
return ret;
}
static bool __ustream_fd_poll(struct ustream_fd *sf, unsigned int events)
{
struct ustream *s = &sf->stream;
bool more = false;
if (events & ULOOP_READ)
ustream_fd_read_pending(sf, &more);
if (events & ULOOP_WRITE) {
bool no_more = ustream_write_pending(s);
if (no_more)
ustream_fd_set_uloop(s, false);
}
if (sf->fd.error && !s->write_error) {
ustream_state_change(s);
s->write_error = true;
ustream_fd_set_uloop(s, false);
}
return more;
}
static bool ustream_fd_poll(struct ustream *s)
{
struct ustream_fd *sf = container_of(s, struct ustream_fd, stream);
return __ustream_fd_poll(sf, ULOOP_READ | ULOOP_WRITE);
}
static void ustream_uloop_cb(struct uloop_fd *fd, unsigned int events)
{
struct ustream_fd *sf = container_of(fd, struct ustream_fd, fd);
__ustream_fd_poll(sf, events);
}
static void ustream_fd_free(struct ustream *s)
{
struct ustream_fd *sf = container_of(s, struct ustream_fd, stream);
uloop_fd_delete(&sf->fd);
}
void ustream_fd_init(struct ustream_fd *sf, int fd)
{
struct ustream *s = &sf->stream;
ustream_init_defaults(s);
sf->fd.fd = fd;
sf->fd.cb = ustream_uloop_cb;
s->set_read_blocked = ustream_fd_set_read_blocked;
s->write = ustream_fd_write;
s->free = ustream_fd_free;
s->poll = ustream_fd_poll;
ustream_fd_set_uloop(s, false);
}