131 строка
3.6 KiB
C
131 строка
3.6 KiB
C
/* -*- Mode: C; c-basic-offset:4 ; -*- */
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/*
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* $Id: seek.c,v 1.8 2002/10/24 15:54:43 gropp Exp $
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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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#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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#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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#ifndef PRINT_ERR_MSG
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static char myname[] = "MPI_FILE_SEEK";
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#endif
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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, fh, MPI_DATATYPE_NULL, -1);
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#endif /* MPI_hpux */
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#ifdef PRINT_ERR_MSG
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if ((fh <= (MPI_File) 0) || (fh->cookie != ADIOI_FILE_COOKIE)) {
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FPRINTF(stderr, "MPI_File_seek: Invalid file handle\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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}
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#else
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ADIOI_TEST_FILE_HANDLE(fh, myname);
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#endif
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if (fh->access_mode & MPI_MODE_SEQUENTIAL) {
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#ifdef PRINT_ERR_MSG
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FPRINTF(stderr, "MPI_File_seek: Can't use this function because file was opened with MPI_MODE_SEQUENTIAL\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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#else
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error_code = MPIR_Err_setmsg(MPI_ERR_UNSUPPORTED_OPERATION,
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MPIR_ERR_AMODE_SEQ, myname, (char *) 0, (char *) 0);
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return ADIOI_Error(fh, error_code, myname);
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#endif
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}
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switch(whence) {
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case MPI_SEEK_SET:
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if (offset < 0) {
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#ifdef PRINT_ERR_MSG
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FPRINTF(stderr, "MPI_File_seek: Invalid offset argument\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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#else
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error_code = MPIR_Err_setmsg(MPI_ERR_ARG, MPIR_ERR_OFFSET_ARG,
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myname, (char *) 0, (char *) 0);
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return ADIOI_Error(fh, error_code, myname);
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#endif
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}
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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(fh, &curr_offset);
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offset += curr_offset;
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if (offset < 0) {
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#ifdef PRINT_ERR_MSG
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FPRINTF(stderr, "MPI_File_seek: offset points to a negative location in the file\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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#else
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error_code = MPIR_Err_setmsg(MPI_ERR_ARG, MPIR_ERR_OFFSET_ARG_NEG,
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myname, (char *) 0, (char *) 0);
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return ADIOI_Error(fh, error_code, myname);
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#endif
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}
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break;
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case MPI_SEEK_END:
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/* find offset corr. to end of file */
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ADIOI_Get_eof_offset(fh, &eof_offset);
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offset += eof_offset;
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if (offset < 0) {
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#ifdef PRINT_ERR_MSG
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FPRINTF(stderr, "MPI_File_seek: offset points to a negative location in the file\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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#else
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error_code = MPIR_Err_setmsg(MPI_ERR_ARG, MPIR_ERR_OFFSET_ARG_NEG,
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myname, (char *) 0, (char *) 0);
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return ADIOI_Error(fh, error_code, myname);
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#endif
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}
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break;
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default:
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#ifdef PRINT_ERR_MSG
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FPRINTF(stderr, "MPI_File_seek: Invalid whence argument\n");
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MPI_Abort(MPI_COMM_WORLD, 1);
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#else
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error_code = MPIR_Err_setmsg(MPI_ERR_ARG, MPIR_ERR_WHENCE_ARG,
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myname, (char *) 0, (char *) 0);
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return ADIOI_Error(fh, error_code, myname);
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#endif
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}
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ADIO_SeekIndividual(fh, offset, ADIO_SEEK_SET, &error_code);
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#ifdef MPI_hpux
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HPMP_IO_END(fl_xmpi, fh, MPI_DATATYPE_NULL, -1);
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#endif /* MPI_hpux */
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return error_code;
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}
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