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/************************************************************************
* IRC - Internet Relay Chat, common/bsd.c
* Copyright (C) 1990 Jarkko Oikarinen and
* University of Oulu, Computing Center
*
* 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 1, 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifndef lint
static const volatile char rcsid[] = "@(#)$Id: bsd.c,v 1.13 2005/12/27 02:23:48 chopin Exp $";
#endif
#include "os.h"
#include "s_defines.h"
#define BSD_C
#include "s_externs.h"
#undef BSD_C
#ifdef DEBUGMODE
int writecalls = 0, writeb[10] = {0,0,0,0,0,0,0,0,0,0};
#endif
RETSIGTYPE dummy(int s)
{
#ifndef HAVE_RELIABLE_SIGNALS
(void)signal(SIGALRM, dummy);
(void)signal(SIGPIPE, dummy);
# ifndef HPUX /* Only 9k/800 series require this, but don't know how to.. */
# ifdef SIGWINCH
(void)signal(SIGWINCH, dummy);
# endif
# endif
#else
# if POSIX_SIGNALS
struct sigaction act;
act.sa_handler = dummy;
act.sa_flags = 0;
(void)sigemptyset(&act.sa_mask);
(void)sigaddset(&act.sa_mask, SIGALRM);
(void)sigaddset(&act.sa_mask, SIGPIPE);
# ifdef SIGWINCH
(void)sigaddset(&act.sa_mask, SIGWINCH);
# endif
(void)sigaction(SIGALRM, &act, (struct sigaction *)NULL);
(void)sigaction(SIGPIPE, &act, (struct sigaction *)NULL);
# ifdef SIGWINCH
(void)sigaction(SIGWINCH, &act, (struct sigaction *)NULL);
# endif
# endif
#endif
}
/*
** deliver_it
** Attempt to send a sequence of bytes to the connection.
** Returns
**
** < 0 Some fatal error occurred, (but not EWOULDBLOCK).
** This return is a request to close the socket and
** clean up the link.
**
** >= 0 No real error occurred, returns the number of
** bytes actually transferred. EWOULDBLOCK and other
** possibly similar conditions should be mapped to
** zero return. Upper level routine will have to
** decide what to do with those unwritten bytes...
**
** *NOTE* alarm calls have been preserved, so this should
** work equally well whether blocking or non-blocking
** mode is used...
*/
int deliver_it(aClient *cptr, char *str, int len)
{
int retval;
aClient *acpt = cptr->acpt;
int savederrno = 0;
#ifdef DEBUGMODE
writecalls++;
#endif
retval = send(cptr->fd, str, len, 0);
/* Prevent overwriting errno of send(). */
if (retval < 0)
savederrno = errno;
/*
** Convert WOULDBLOCK to a return of "0 bytes moved". This
** should occur only if socket was non-blocking. Note, that
** all is Ok, if the 'write' just returns '0' instead of an
** error and errno=EWOULDBLOCK.
**
** ...now, would this work on VMS too? --msa
*/
if (retval < 0 && (errno == EWOULDBLOCK || errno == EAGAIN ||
#ifdef EMSGSIZE
errno == EMSGSIZE ||
#endif
errno == ENOBUFS))
{
retval = 0;
cptr->flags |= FLAGS_BLOCKED;
}
else if (retval > 0)
cptr->flags &= ~FLAGS_BLOCKED;
#ifdef DEBUGMODE
if (retval < 0) {
writeb[0]++;
Debug((DEBUG_ERROR,"write error (%s) to %s",
strerror(errno), cptr->name));
} else if (retval == 0)
writeb[1]++;
else if (retval < 16)
writeb[2]++;
else if (retval < 32)
writeb[3]++;
else if (retval < 64)
writeb[4]++;
else if (retval < 128)
writeb[5]++;
else if (retval < 256)
writeb[6]++;
else if (retval < 512)
writeb[7]++;
else if (retval < 1024)
writeb[8]++;
else
writeb[9]++;
#endif
if (retval > 0)
{
#if defined(DEBUGMODE) && defined(DEBUG_WRITE)
Debug((DEBUG_WRITE, "send = %d bytes to %d[%s]:[%*.*s]\n",
retval, cptr->fd, cptr->name, retval, retval, str));
#endif
cptr->sendB += retval;
me.sendB += retval;
if (acpt != &me)
{
acpt->sendB += retval;
}
}
/* Retval of erroneous send() would always be -1, so we return
** (negative) saved errno, so upper layer will give proper notice.
** Note above about EAGAIN or EWOULDBLOCK. --B. */
if (retval < 0)
retval = -savederrno;
return(retval);
}
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