/*
   This source code file is part of thread_mpi.
   Written by Sander Pronk, Erik Lindahl, and possibly others.

   Copyright (c) 2009, Sander Pronk, Erik Lindahl.
   All rights reserved.

   Redistribution and use in source and binary forms, with or without
   modification, are permitted provided that the following conditions are met:
   1) Redistributions of source code must retain the above copyright
   notice, this list of conditions and the following disclaimer.
   2) Redistributions in binary form must reproduce the above copyright
   notice, this list of conditions and the following disclaimer in the
   documentation and/or other materials provided with the distribution.
   3) Neither the name of the copyright holders nor the
   names of its contributors may be used to endorse or promote products
   derived from this software without specific prior written permission.

   THIS SOFTWARE IS PROVIDED BY US ''AS IS'' AND ANY
   EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
   DISCLAIMED. IN NO EVENT SHALL WE BE LIABLE FOR ANY
   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
   (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
   LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
   ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
   SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

   If you want to redistribute modifications, please consider that
   scientific software is very special. Version control is crucial -
   bugs must be traceable. We will be happy to consider code for
   inclusion in the official distribution, but derived work should not
   be called official thread_mpi. Details are found in the README & COPYING
   files.
 */

#ifdef HAVE_TMPI_CONFIG_H
#include "tmpi_config.h"
#endif

#ifdef HAVE_CONFIG_H
#include "config.h"
#endif

#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif

#include <errno.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#if !(defined( _WIN32 ) || defined( _WIN64 ) )
#include <sys/time.h>
#endif

#include "impl.h"






struct tmpi_errhandler_ tmpi_errors_are_fatal = { 0, tmpi_errors_are_fatal_fn };
struct tmpi_errhandler_ tmpi_errors_return = { 0, tmpi_errors_return_fn };


tMPI_Errhandler TMPI_ERRORS_ARE_FATAL = &tmpi_errors_are_fatal;
tMPI_Errhandler TMPI_ERRORS_RETURN    = &tmpi_errors_return;




/* error messages. Must match error codes in thread_mpi.h */
static const char *tmpi_errmsg[] =
{
    "No error",
    "malloc failure in tMPI (out of memory)",
    "I/O or system error",
    "tMPI Initialization error",
    "tMPI Finalize error",
    "Invalid tMPI_Group",
    "Invalid tMPI_Comm",
    "Invalid tMPI_Status",
    "Invalid tMPI_Group rank",
    "Invalid Cartesian topology dimensions",
    "Invalid Cartesian topology coordinates",
    "Insufficient number processes for Cartesian topology",
    "Invalid counterpart for MPI transfer",
    "Receive buffer size too small for transmission",
    "Overlapping send/receive buffers: probably due to thread-unsafe code.",
    "Invalid send destination",
    "Invalid receive source",
    "Invalid buffer (null pointer in send or receive buffer)",
    "Multicast operation mismatch (multicast not collective across comm)",
    "Invalid reduce operator",
    "Out of receive envelopes: this shouldn't happen (probably a bug).",
    "Out of receive requests: this shouldn't happen (probably a bug).",
    "Out of copy buffers: this shouldn't happen (probably a bug).",
    "Copy buffer size too small: this shouldn't happen (probably a bug).",
    "Error in MPI_Status",
    "Error getting/setting processor layout/affinity",
    "Transmission failure",
    "Unknown tMPI error"
};



int tMPI_Error(tMPI_Comm comm, int tmpi_errno)
{
    if (comm)
    {
        comm->erh->err = tmpi_errno;
        comm->erh->fn(&comm, &tmpi_errno);
    }
    else
    {
        /* initialization errors have no comm */
        tmpi_errors_are_fatal_fn(NULL, &tmpi_errno);
    }
    return tmpi_errno;
}


int tMPI_Error_string(int errorcode, char *strn, size_t *resultlen)
{
    if (errorcode < 0 || errorcode >= N_TMPI_ERR)
    {
        errorcode = TMPI_ERR_UNKNOWN;
    }

    if (errorcode != TMPI_ERR_IO)
    {
#ifndef _MSC_VER
        strncpy(strn, tmpi_errmsg[errorcode], TMPI_MAX_ERROR_STRING);
#else
        strncpy_s(strn, TMPI_MAX_ERROR_STRING, tmpi_errmsg[errorcode],
                  TMPI_MAX_ERROR_STRING);
#endif
    }
    else
    {
#ifndef _MSC_VER
        snprintf(strn, TMPI_MAX_ERROR_STRING,
                 "%s: %s", tmpi_errmsg[errorcode], strerror(errno));
#else
        char buf[TMPI_MAX_ERROR_STRING];

        strerror_s(buf, TMPI_MAX_ERROR_STRING-1, errno);
        _snprintf_s(strn, TMPI_MAX_ERROR_STRING, _TRUNCATE,
                    "%s: %s", tmpi_errmsg[errorcode], buf);
#endif

    }
    *resultlen = strlen(strn);
    return TMPI_SUCCESS;
}

int tMPI_Create_errhandler(tMPI_Errhandler_fn *function,
                           tMPI_Errhandler    *errhandler)
{
#ifdef TMPI_TRACE
    tMPI_Trace_print("tMPI_Create_errhandler(%p, %p)", function, errhandler);
#endif

    /* we don't use a special malloc here because this is the error handler
       creation function. */
    *errhandler = (tMPI_Errhandler)malloc(sizeof(struct tmpi_errhandler_));
    if (!*errhandler)
    {
        fprintf(stderr, "tMPI fatal error (%s), bailing out\n",
                tmpi_errmsg[TMPI_ERR_NO_MEM]);
        abort();
    }
    (*errhandler)->err = 0;
    (*errhandler)->fn  = *function;
    return TMPI_SUCCESS;
}

int tMPI_Errhandler_free(tMPI_Errhandler *errhandler)
{
#ifdef TMPI_TRACE
    tMPI_Trace_print("tMPI_Errhandler_free(%p)", errhandler);
#endif

    free(*errhandler);
    return TMPI_SUCCESS;
}


int tMPI_Comm_set_errhandler(tMPI_Comm comm, tMPI_Errhandler errhandler)
{
#ifdef TMPI_TRACE
    tMPI_Trace_print("tMPI_Comm_set_errhandler(%p, %p)", comm, errhandler);
#endif

    comm->erh = errhandler;
    return TMPI_SUCCESS;
}

int tMPI_Comm_get_errhandler(tMPI_Comm comm, tMPI_Errhandler *errhandler)
{
#ifdef TMPI_TRACE
    tMPI_Trace_print("tMPI_Comm_get_errhandler(%p, %p)", comm, errhandler);
#endif

    *errhandler = comm->erh;
    return TMPI_SUCCESS;
}

void tmpi_errors_are_fatal_fn(tMPI_Comm *comm, int *err)
{
    char   errstr[TMPI_MAX_ERROR_STRING];
    size_t len;

    tMPI_Error_string(*err, errstr, &len);
    if (comm)
    {
        fprintf(stderr, "tMPI error: %s (in valid comm)\n", errstr);
    }
    else
    {
        fprintf(stderr, "tMPI error: %s\n", errstr);
    }
    abort();
    /*exit(0);*/
}

void tmpi_errors_return_fn(tMPI_Comm *comm, int *err)
{
    char   errstr[TMPI_MAX_ERROR_STRING];
    size_t len;

    tMPI_Error_string(*err, errstr, &len);
    if (comm)
    {
        fprintf(stderr, "tMPI error: %s (in valid comm)\n", errstr);
    }
    else
    {
        fprintf(stderr, "tMPI error: %s\n", errstr);
    }
    return;
}
