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/*
* $Id$
*
* Copyright (C) 2001-2003 FhG Fokus
*
* This file is part of ser, a free SIP server.
*
* ser 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
*
* For a license to use the ser software under conditions
* other than those described here, or to purchase support for this
* software, please contact iptel.org by e-mail at the following addresses:
* info@iptel.org
*
* ser 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
*/
/*
* send with timeout for stream and datagram sockets
*
* History:
* --------
* 2004-02-26 created by andrei
* 2003-03-03 switched to heavy macro use, added tsend_dgram_ev (andrei)
* 2006-02-03 tsend* will wait forever if timeout==-1 (andrei)
*/
/*!
* \file
* \brief SIP-router core ::
* \ingroup core
* Module: \ref core
*/
#include <string.h>
#include <errno.h>
#include <sys/poll.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/uio.h>
#include "dprint.h"
#include "timer.h"
#include "timer_ticks.h"
/* the functions below are very similar => some generic macros */
#define TSEND_INIT \
int n; \
struct pollfd pf; \
ticks_t expire; \
s_ticks_t diff; \
expire=get_ticks_raw()+MS_TO_TICKS((ticks_t)timeout); \
pf.fd=fd; \
pf.events=POLLOUT
#define TSEND_POLL(f_name) \
poll_loop: \
while(1){ \
if (timeout==-1) \
n=poll(&pf, 1, -1); \
else{ \
diff=expire-get_ticks_raw(); \
if (diff<=0){ \
LOG(L_ERR, "ERROR: " f_name ": send timeout (%d)\n", timeout);\
goto error; \
} \
n=poll(&pf, 1, TICKS_TO_MS((ticks_t)diff)); \
} \
if (n<0){ \
if (errno==EINTR) continue; /* signal, ignore */ \
LOG(L_ERR, "ERROR: " f_name ": poll failed: %s [%d]\n", \
strerror(errno), errno); \
goto error; \
}else if (n==0){ \
/* timeout */ \
LOG(L_ERR, "ERROR: " f_name ": send timeout (p %d)\n", timeout); \
goto error; \
} \
if (pf.revents&POLLOUT){ \
/* we can write again */ \
goto again; \
}else if (pf.revents&(POLLERR|POLLHUP|POLLNVAL)){ \
LOG(L_ERR, "ERROR: " f_name ": bad poll flags %x\n", \
pf.revents); \
goto error; \
} \
/* if POLLIN or POLLPRI or other non-harmful events happened, \
* continue ( although poll should never signal them since we're \
* not interested in them => we should never reach this point) */ \
}
#define TSEND_ERR_CHECK(f_name)\
if (n<0){ \
if (errno==EINTR) goto again; \
else if (errno!=EAGAIN && errno!=EWOULDBLOCK){ \
LOG(L_ERR, "ERROR: " f_name ": failed to send: (%d) %s\n", \
errno, strerror(errno)); \
goto error; \
}else goto poll_loop; \
}
/* sends on fd (which must be O_NONBLOCK if you want a finite timeout); if it
* cannot send any data
* in timeout milliseconds it will return ERROR
* if timeout==-1, it waits forever
* returns: -1 on error, or number of bytes written
* (if less than len => couldn't send all)
* bugs: signals will reset the timer
*/
int tsend_stream(int fd, const char* buf, unsigned int len, int timeout)
{
int written;
TSEND_INIT;
written=0;
again:
n=send(fd, buf, len,
#ifdef HAVE_MSG_NOSIGNAL
MSG_NOSIGNAL
#else
0
#endif
);
TSEND_ERR_CHECK("tsend_stream");
written+=n;
if (n<(int)len){
/* partial write */
buf+=n;
len-=n;
}else{
/* successful full write */
return written;
}
TSEND_POLL("tsend_stream");
error:
return -1;
}
/* sends on dgram fd (which must be O_NONBLOCK); if it cannot send any data
* in timeout milliseconds it will return ERROR
* returns: -1 on error, or number of bytes written
* (if less than len => couldn't send all)
* bugs: signals will reset the timer
*/
int tsend_dgram(int fd, const char* buf, unsigned int len,
const struct sockaddr* to, socklen_t tolen, int timeout)
{
TSEND_INIT;
again:
n=sendto(fd, buf, len, 0, to, tolen);
TSEND_ERR_CHECK("tsend_dgram");
/* we don't care about partial writes: they shouldn't happen on
* a datagram socket */
return n;
TSEND_POLL("tsend_datagram");
error:
return -1;
}
/* sends on connected datagram fd (which must be O_NONBLOCK);
* if it cannot send any data in timeout milliseconds it will return ERROR
* returns: -1 on error, or number of bytes written
* (if less than len => couldn't send all)
* bugs: signals will reset the timer
*/
int tsend_dgram_ev(int fd, const struct iovec* v, int count, int timeout)
{
TSEND_INIT;
again:
n=writev(fd, v, count);
TSEND_ERR_CHECK("tsend_datagram_ev");
return n;
TSEND_POLL("tsend_datagram_ev");
error:
return -1;
}
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