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/* $Id$ */
/***
This file is part of bidilink.
bidilink is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
bidilink is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public
License for more details.
You should have received a copy of the GNU General Public License
along with bidilink; if not, write to the Free Software Foundation,
Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
***/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <stdlib.h>
#include <unistd.h>
#include <assert.h>
#include <sys/select.h>
#include <signal.h>
#include <inttypes.h>
#include "stream.h"
#define BUFSIZE (64*1024)
volatile int quit = 0;
static void signal_handler(int s) {
quit = 1;
}
static void usage(FILE *f, const char *argv0) {
fprintf(f, "%s [STREAM1] [STREAM2]\n", argv0);
}
static int read_fd(struct stream *s, void *buf, size_t *buf_fill, size_t *buf_index) {
ssize_t r;
assert(s && buf && buf_fill && buf_index);
if ((r = read(s->input_fd, buf, BUFSIZE)) <= 0) {
if (r == 0)
return 0;
fprintf(stderr, "Failure to read(): %s\n", strerror(errno));
return -1;
}
*buf_fill = r;
*buf_index = 0;
return 1;
}
static int write_fd(struct stream *s, void *buf, size_t *buf_fill, size_t *buf_index) {
ssize_t r;
assert(s && buf && buf_fill && buf_index);
if ((r = write(s->output_fd, buf+*buf_index, *buf_fill)) < 0) {
if (r == EPIPE)
return 0;
fprintf(stderr, "Failure to write(): %s\n", strerror(errno));
return -1;
}
*buf_fill -= r;
*buf_index += r;
return 1;
}
const char *byte_str(uint64_t l) {
static char c[32];
if (l <= 1024)
snprintf(c, sizeof(c), "%llu B", l);
else if (l <= 1024*1024)
snprintf(c, sizeof(c), "%llu KB", l/1024);
else if (l <= 1024*1024*1024)
snprintf(c, sizeof(c), "%llu MB", l/1024/1024);
else
snprintf(c, sizeof(c), "%llu GB", l/1024/1024/1024);
return c;
};
int main(int argc, char *argv[]) {
struct stream *a = NULL, *b = NULL;
void *ab_buf = NULL, *ba_buf = NULL;
size_t ab_buf_fill = 0, ab_buf_index = 0,
ba_buf_fill = 0, ba_buf_index = 0;
uint64_t ab_count = 0, ba_count = 0;
int a_readable = 0,
a_writable = 0,
b_readable = 0,
b_writable = 0,
verbose = 0;
int ret = -1;
int ai;
if (argc < 2) {
usage(stderr, argv[0]);
ret = 0;
goto finish;
}
signal(SIGINT, signal_handler);
siginterrupt(SIGINT, 1);
signal(SIGTERM, signal_handler);
siginterrupt(SIGTERM, 1);
signal(SIGPIPE, SIG_IGN);
ai = 1;
if (!strcmp(argv[ai], "-v")) {
verbose = 1;
ai++;
}
if (!(a = stream_open(argv[ai++])))
goto finish;
if (!(b = stream_open(argc > ai ? argv[ai++] : NULL)))
goto finish;
ab_buf = malloc(BUFSIZE);
assert(ab_buf);
ba_buf = malloc(BUFSIZE);
assert(ba_buf);
for (;;) {
fd_set ifds, ofds;
FD_ZERO(&ifds);
if (!a_readable)
FD_SET(a->input_fd, &ifds);
if (!b_readable)
FD_SET(b->input_fd, &ifds);
FD_ZERO(&ofds);
if (!a_writable)
FD_SET(a->output_fd, &ofds);
if (!b_writable)
FD_SET(b->output_fd, &ofds);
if (select(FD_SETSIZE, &ifds, &ofds, NULL, 0) < 0) {
if (errno == EINTR)
continue;
fprintf(stderr, "select() failed: %s\n", strerror(errno));
ret = -1;
break;
}
if (FD_ISSET(a->input_fd, &ifds))
a_readable = 1;
if (FD_ISSET(b->input_fd, &ifds))
b_readable = 1;
if (FD_ISSET(a->output_fd, &ofds))
a_writable = 1;
if (FD_ISSET(b->output_fd, &ofds))
b_writable = 1;
if (!ab_buf_fill && a_readable && b_writable) {
int r;
if ((r = read_fd(a, ab_buf, &ab_buf_fill, &ab_buf_index)) <= 0) {
ret = r < 0 ? 1 : 0;
break;
}
a_readable = 0;
ab_count += ab_buf_fill;
}
if (ab_buf_fill && b_writable) {
int r;
if ((r = write_fd(b, ab_buf, &ab_buf_fill, &ab_buf_index)) <= 0) {
ret = r < 0 ? 1 : 0;
break;
}
b_writable = 0;
}
if (!ba_buf_fill && b_readable && a_writable) {
int r;
if ((r = read_fd(b, ba_buf, &ba_buf_fill, &ba_buf_index)) <= 0) {
ret = r < 0 ? 1 : 0;
break;
}
b_readable = 0;
ba_count += ba_buf_fill;
}
if (ba_buf_fill && a_writable) {
int r;
if ((r = write_fd(a, ba_buf, &ba_buf_fill, &ba_buf_index)) <= 0) {
ret = r < 0 ? 1 : 0;
break;
}
a_writable = 0;
}
if (verbose) {
fprintf(stderr, "A: %s; ", byte_str(ab_count));
fprintf(stderr, "B: %s \r", byte_str(ba_count));
}
}
finish:
free(ab_buf);
free(ba_buf);
if (a)
stream_close(a);
if (b)
stream_close(b);
return ret;
}
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