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/* -*- c-file-style: "java"; indent-tabs-mode: nil; tab-width: 4; fill-column: 78 -*-
*
* distcc -- A simple distributed compiler system
*
* Copyright (C) 2003, 2004 by Martin Pool
*
* This program 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.
*
* This program 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 this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301,
* USA.
*/
/* pump.c - Transfer of bulk data (source, object code) */
#include <config.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <fcntl.h>
#include <errno.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <sys/socket.h>
#ifdef HAVE_SYS_SELECT_H
# include <sys/select.h>
#endif
#include <sys/time.h>
#ifdef HAVE_SYS_MMAN_H
# include <sys/mman.h>
#endif
#include <netinet/in.h>
#include <netinet/tcp.h>
#include "distcc.h"
#include "trace.h"
#include "util.h"
#include "exitcode.h"
/*
* Receive either compressed or uncompressed bulk data.
*/
int dcc_r_bulk(int ofd,
int ifd,
unsigned f_size,
enum dcc_compress compression)
{
if (f_size == 0)
return 0; /* don't decompress nothing */
if (compression == DCC_COMPRESS_NONE) {
return dcc_pump_readwrite(ofd, ifd, f_size);
} else if (compression == DCC_COMPRESS_LZO1X) {
return dcc_r_bulk_lzo1x(ofd, ifd, f_size);
} else {
rs_log_error("impossible compression %d", compression);
return EXIT_PROTOCOL_ERROR;
}
}
/**
* Copy @p n bytes from @p ifd to @p ofd.
*
* Does not use sendfile(), so either one may be a socket.
*
* In the current code at least one of the files will always be a regular
* (disk) file, even though it may not be mmapable. That should mean that
* writes to it will always complete immediately. That in turn means that on
* each pass through the main loop we ought to either completely fill our
* buffer, or completely drain it, depending on which one is the disk.
*
* In future we may put back the ability to feed the compiler from a fifo, in
* which case it may be that the writes don't complete.
*
* We might try selecting on both buffers and handling whichever is ready.
* This would require some approximation to a circular buffer though, which
* might be more complex.
**/
int
dcc_pump_readwrite(int ofd, int ifd, size_t n)
{
static char buf[262144]; /* we're not recursive */
char *p;
ssize_t r_in, r_out, wanted;
int ret;
while (n > 0) {
wanted = (n > sizeof buf) ? (sizeof buf) : n;
r_in = read(ifd, buf, (size_t) wanted);
if (r_in == -1 && errno == EAGAIN) {
if ((ret = dcc_select_for_read(ifd, dcc_io_timeout)) != 0)
return ret;
else
continue;
} else if (r_in == -1 && errno == EINTR) {
continue;
} else if (r_in == -1) {
rs_log_error("failed to read %ld bytes: %s",
(long) wanted, strerror(errno));
return EXIT_IO_ERROR;
} else if (r_in == 0) {
rs_log_error("unexpected eof on fd%d", ifd);
return EXIT_IO_ERROR;
}
n -= r_in;
p = buf;
/* We now have r_in bytes waiting to go out, starting at p. Keep
* going until they're all written out. */
while (r_in > 0) {
r_out = write(ofd, p, (size_t) r_in);
if (r_out == -1 && errno == EAGAIN) {
if ((ret = dcc_select_for_write(ofd, dcc_io_timeout)) != 0)
return ret;
else
continue;
} else if (r_out == -1 && errno == EINTR) {
continue;
} else if (r_out == -1 || r_out == 0) {
rs_log_error("failed to write: %s", strerror(errno));
return EXIT_IO_ERROR;
}
r_in -= r_out;
p += r_out;
}
}
return 0;
}
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