Charm++: Charm Source Code Documentation

00001 /* -*- Mode: C; c-basic-offset:4 ; -*- */
00002 /* 
00003  *   $Id$    
00004  *
00005  *   Copyright (C) 1997 University of Chicago. 
00006  *   See COPYRIGHT notice in top-level directory.
00007  */
00008 
00009 #include "mpioimpl.h"
00010 
00011 #ifdef HAVE_WEAK_SYMBOLS
00012 
00013 #if defined(HAVE_PRAGMA_WEAK)
00014 #pragma weak MPI_File_seek = PMPI_File_seek
00015 #elif defined(HAVE_PRAGMA_HP_SEC_DEF)
00016 #pragma _HP_SECONDARY_DEF PMPI_File_seek MPI_File_seek
00017 #elif defined(HAVE_PRAGMA_CRI_DUP)
00018 #pragma _CRI duplicate MPI_File_seek as PMPI_File_seek
00019 /* end of weak pragmas */
00020 #endif
00021 
00022 /* Include mapping from MPI->PMPI */
00023 #define MPIO_BUILD_PROFILING
00024 #include "mpioprof.h"
00025 #endif
00026 
00027 /*@
00028     MPI_File_seek - Updates the individual file pointer
00029 
00030 Input Parameters:
00031 . fh - file handle (handle)
00032 . offset - file offset (integer)
00033 . whence - update mode (state)
00034 
00035 .N fortran
00036 @*/
00037 int MPI_File_seek(MPI_File fh, MPI_Offset offset, int whence)
00038 {
00039     int error_code;
00040 #ifndef PRINT_ERR_MSG
00041     static char myname[] = "MPI_FILE_SEEK";
00042 #endif
00043     MPI_Offset curr_offset, eof_offset;
00044 #ifdef MPI_hpux
00045     int fl_xmpi;
00046 
00047     HPMP_IO_START(fl_xmpi, BLKMPIFILESEEK, TRDTBLOCK, fh, MPI_DATATYPE_NULL, -1);
00048 #endif /* MPI_hpux */
00049 
00050 #ifdef PRINT_ERR_MSG
00051     if ((fh <= (MPI_File) 0) || (fh->cookie != ADIOI_FILE_COOKIE)) {
00052         FPRINTF(stderr, "MPI_File_seek: Invalid file handle\n");
00053         MPI_Abort(MPI_COMM_WORLD, 1);
00054     }
00055 #else
00056     ADIOI_TEST_FILE_HANDLE(fh, myname);
00057 #endif
00058 
00059     if (fh->access_mode & MPI_MODE_SEQUENTIAL) {
00060 #ifdef PRINT_ERR_MSG
00061         FPRINTF(stderr, "MPI_File_seek: Can't use this function because file was opened with MPI_MODE_SEQUENTIAL\n");
00062         MPI_Abort(MPI_COMM_WORLD, 1);
00063 #else
00064         error_code = MPIR_Err_setmsg(MPI_ERR_UNSUPPORTED_OPERATION, 
00065                         MPIR_ERR_AMODE_SEQ, myname, (char *) 0, (char *) 0);
00066         return ADIOI_Error(fh, error_code, myname);
00067 #endif
00068     }
00069 
00070     switch(whence) {
00071     case MPI_SEEK_SET:
00072         if (offset < 0) {
00073 #ifdef PRINT_ERR_MSG
00074             FPRINTF(stderr, "MPI_File_seek: Invalid offset argument\n");
00075             MPI_Abort(MPI_COMM_WORLD, 1);
00076 #else
00077         error_code = MPIR_Err_setmsg(MPI_ERR_ARG, MPIR_ERR_OFFSET_ARG,
00078                                      myname, (char *) 0, (char *) 0);
00079         return ADIOI_Error(fh, error_code, myname);         
00080 #endif
00081         }
00082         break;
00083     case MPI_SEEK_CUR:
00084         /* find offset corr. to current location of file pointer */
00085         ADIOI_Get_position(fh, &curr_offset);
00086         offset += curr_offset;
00087         if (offset < 0) {
00088 #ifdef PRINT_ERR_MSG
00089             FPRINTF(stderr, "MPI_File_seek: offset points to a negative location in the file\n");
00090             MPI_Abort(MPI_COMM_WORLD, 1);
00091 #else
00092         error_code = MPIR_Err_setmsg(MPI_ERR_ARG, MPIR_ERR_OFFSET_ARG_NEG,
00093                                      myname, (char *) 0, (char *) 0);
00094         return ADIOI_Error(fh, error_code, myname);         
00095 #endif
00096         }
00097         break;
00098     case MPI_SEEK_END:
00099         /* find offset corr. to end of file */
00100         ADIOI_Get_eof_offset(fh, &eof_offset);
00101         offset += eof_offset;
00102         if (offset < 0) {
00103 #ifdef PRINT_ERR_MSG
00104             FPRINTF(stderr, "MPI_File_seek: offset points to a negative location in the file\n");
00105             MPI_Abort(MPI_COMM_WORLD, 1);
00106 #else
00107         error_code = MPIR_Err_setmsg(MPI_ERR_ARG, MPIR_ERR_OFFSET_ARG_NEG,
00108                                      myname, (char *) 0, (char *) 0);
00109         return ADIOI_Error(fh, error_code, myname);         
00110 #endif
00111         }
00112         break;
00113     default:
00114 #ifdef PRINT_ERR_MSG
00115         FPRINTF(stderr, "MPI_File_seek: Invalid whence argument\n");
00116         MPI_Abort(MPI_COMM_WORLD, 1);
00117 #else
00118         error_code = MPIR_Err_setmsg(MPI_ERR_ARG, MPIR_ERR_WHENCE_ARG,
00119                                      myname, (char *) 0, (char *) 0);
00120         return ADIOI_Error(fh, error_code, myname);
00121 #endif
00122     }
00123 
00124     ADIO_SeekIndividual(fh, offset, ADIO_SEEK_SET, &error_code);
00125 
00126 #ifdef MPI_hpux
00127     HPMP_IO_END(fl_xmpi, fh, MPI_DATATYPE_NULL, -1);
00128 #endif /* MPI_hpux */
00129     return error_code;
00130 }
libs/ck-libs/ampi/romio/mpi-io/seek.c
