140 строки
3.7 KiB
C
140 строки
3.7 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
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/*
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*
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* Copyright (C) 1997 University of Chicago.
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* See COPYRIGHT notice in top-level directory.
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*/
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#include "mpioimpl.h"
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#include "adioi.h"
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#ifdef HAVE_WEAK_SYMBOLS
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#if defined(HAVE_PRAGMA_WEAK)
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#pragma weak MPI_File_seek = PMPI_File_seek
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#elif defined(HAVE_PRAGMA_HP_SEC_DEF)
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#pragma _HP_SECONDARY_DEF PMPI_File_seek MPI_File_seek
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#elif defined(HAVE_PRAGMA_CRI_DUP)
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#pragma _CRI duplicate MPI_File_seek as PMPI_File_seek
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/* end of weak pragmas */
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#elif defined(HAVE_WEAK_ATTRIBUTE)
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int MPI_File_seek(MPI_File fh, MPI_Offset offset, int whence) __attribute__((weak,alias("PMPI_File_seek")));
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#endif
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/* Include mapping from MPI->PMPI */
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#define MPIO_BUILD_PROFILING
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#include "mpioprof.h"
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#endif
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/*@
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MPI_File_seek - Updates the individual file pointer
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Input Parameters:
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. fh - file handle (handle)
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. offset - file offset (integer)
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. whence - update mode (state)
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.N fortran
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@*/
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int MPI_File_seek(MPI_File fh, MPI_Offset offset, int whence)
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{
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int error_code;
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ADIO_File adio_fh;
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static char myname[] = "MPI_FILE_SEEK";
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MPI_Offset curr_offset, eof_offset;
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#ifdef MPI_hpux
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int fl_xmpi;
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HPMP_IO_START(fl_xmpi, BLKMPIFILESEEK, TRDTBLOCK, adio_fh, MPI_DATATYPE_NULL, -1);
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#endif /* MPI_hpux */
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ROMIO_THREAD_CS_ENTER();
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adio_fh = MPIO_File_resolve(fh);
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/* --BEGIN ERROR HANDLING-- */
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MPIO_CHECK_FILE_HANDLE(adio_fh, myname, error_code);
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MPIO_CHECK_NOT_SEQUENTIAL_MODE(adio_fh, myname, error_code);
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/* --END ERROR HANDLING-- */
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switch(whence) {
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case MPI_SEEK_SET:
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/* --BEGIN ERROR HANDLING-- */
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if (offset < 0) {
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error_code = MPIO_Err_create_code(MPI_SUCCESS,
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MPIR_ERR_RECOVERABLE, myname,
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__LINE__, MPI_ERR_ARG,
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"**iobadoffset", 0);
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error_code = MPIO_Err_return_file(adio_fh, error_code);
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goto fn_exit;
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}
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/* --END ERROR HANDLING-- */
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break;
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case MPI_SEEK_CUR:
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/* find offset corr. to current location of file pointer */
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ADIOI_Get_position(adio_fh, &curr_offset);
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offset += curr_offset;
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/* --BEGIN ERROR HANDLING-- */
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if (offset < 0) {
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error_code = MPIO_Err_create_code(MPI_SUCCESS,
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MPIR_ERR_RECOVERABLE, myname,
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__LINE__, MPI_ERR_ARG,
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"**ionegoffset", 0);
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error_code = MPIO_Err_return_file(adio_fh, error_code);
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goto fn_exit;
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}
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/* --END ERROR HANDLING-- */
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break;
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case MPI_SEEK_END:
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/* we can in many cases do seeks w/o a file actually opened, but not in
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* the MPI_SEEK_END case */
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ADIOI_TEST_DEFERRED(adio_fh, "MPI_File_seek", &error_code);
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/* find offset corr. to end of file */
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ADIOI_Get_eof_offset(adio_fh, &eof_offset);
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offset += eof_offset;
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/* --BEGIN ERROR HANDLING-- */
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if (offset < 0) {
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error_code = MPIO_Err_create_code(MPI_SUCCESS,
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MPIR_ERR_RECOVERABLE, myname,
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__LINE__, MPI_ERR_ARG,
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"**ionegoffset", 0);
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error_code = MPIO_Err_return_file(adio_fh, error_code);
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goto fn_exit;
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}
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/* --END ERROR HANDLING-- */
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break;
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default:
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/* --BEGIN ERROR HANDLING-- */
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error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
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myname, __LINE__, MPI_ERR_ARG,
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"**iobadwhence", 0);
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error_code = MPIO_Err_return_file(adio_fh, error_code);
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goto fn_exit;
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/* --END ERROR HANDLING-- */
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}
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ADIO_SeekIndividual(adio_fh, offset, ADIO_SEEK_SET, &error_code);
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/* TODO: what do we do with this error? */
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/* --BEGIN ERROR HANDLING-- */
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if (error_code != MPI_SUCCESS)
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error_code = MPIO_Err_return_file(adio_fh, error_code);
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/* --END ERROR HANDLING-- */
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#ifdef MPI_hpux
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HPMP_IO_END(fl_xmpi, adio_fh, MPI_DATATYPE_NULL, -1);
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#endif /* MPI_hpux */
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error_code = MPI_SUCCESS;
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fn_exit:
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ROMIO_THREAD_CS_EXIT();
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return error_code;
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}
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