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test/mpi/io: Check status after zero-byte read
Until [4b7d553], ROMIO was failing to fill in the status object for zero-byte operations. See pmodels#2332. Co-authored-by: Jeff Hammond <[email protected]>
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/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */ | ||
/* | ||
* (C) 2019 by Argonne National Laboratory. | ||
* See COPYRIGHT in top-level directory. | ||
*/ | ||
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#include <stdio.h> | ||
#include <stdlib.h> | ||
#include <string.h> | ||
#include <mpi.h> | ||
#include "mpitest.h" | ||
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/* | ||
static char MTEST_Descrip[] = "Test count for zero length reads"; | ||
*/ | ||
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int main(int argc, char **argv) | ||
{ | ||
int errs = 0; | ||
int len, rank, get_size; | ||
char buf[10], *filename = __FILE__; | ||
MPI_File fh; | ||
MPI_Status status; | ||
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MPI_Init(&argc, &argv); | ||
MPI_Comm_rank(MPI_COMM_WORLD, &rank); | ||
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MPI_File_open(MPI_COMM_WORLD, filename, MPI_MODE_CREATE | MPI_MODE_RDWR, MPI_INFO_NULL, &fh); | ||
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if (rank == 0) | ||
len = 10; | ||
else | ||
len = 0; | ||
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/* mimic the case status object may not be initialized to 0 */ | ||
memset(&status, 1, sizeof(status)); | ||
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MPI_File_read_all(fh, buf, len, MPI_BYTE, &status); | ||
MPI_Get_count(&status, MPI_BYTE, &get_size); | ||
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if (len != get_size) { | ||
printf("Error: expecting get_size to be %d but got %d\n", len, get_size); | ||
errs++; | ||
} | ||
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MPI_File_close(&fh); | ||
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MTest_Finalize(errs); | ||
return 0; | ||
} |