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/* -*- mode: c; c-basic-offset: 4; indent-tabs-mode: nil -*- */
/* lib/krb5/os/cm.c - Connection manager functions */
/*
* Copyright (C) 2011 by the Massachusetts Institute of Technology.
* All rights reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*/
/*
* This file include krb5int_cm_call_select, which is used by
* lib/apputils/net-server.c and sometimes by sendto_kdc.c.
*/
#include "k5-int.h"
#include "os-proto.h"
#ifdef HAVE_SYS_SELECT_H
#include <sys/select.h>
#endif
#ifdef _WIN32
#include <sys/timeb.h>
#endif
#include "cm.h"
int
k5_getcurtime(struct timeval *tvp)
{
#ifdef _WIN32
struct _timeb tb;
_ftime(&tb);
tvp->tv_sec = tb.time;
tvp->tv_usec = tb.millitm * 1000;
/* Can _ftime fail? */
return 0;
#else
if (gettimeofday(tvp, 0))
return errno;
return 0;
#endif
}
/*
* Call select and return results.
* Input: interesting file descriptors and absolute timeout
* Output: select return value (-1 or num fds ready) and fd_sets
* Return: 0 (for i/o available or timeout) or error code.
*/
krb5_error_code
krb5int_cm_call_select (const struct select_state *in,
struct select_state *out, int *sret)
{
struct timeval now, *timo;
krb5_error_code e;
*out = *in;
e = k5_getcurtime(&now);
if (e)
return e;
if (out->end_time.tv_sec == 0)
timo = 0;
else {
timo = &out->end_time;
out->end_time.tv_sec -= now.tv_sec;
out->end_time.tv_usec -= now.tv_usec;
if (out->end_time.tv_usec < 0) {
out->end_time.tv_usec += 1000000;
out->end_time.tv_sec--;
}
if (out->end_time.tv_sec < 0) {
*sret = 0;
return 0;
}
}
*sret = select(out->max, &out->rfds, &out->wfds, &out->xfds, timo);
e = SOCKET_ERRNO;
if (*sret < 0)
return e;
return 0;
}
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