text: /* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
  /*
   *
   *   Copyright (C) 1997 University of Chicago.
   *   See COPYRIGHT notice in top-level directory.
   */
  
  #include "mpioimpl.h"
  
  #ifdef HAVE_WEAK_SYMBOLS
  
  #if defined(HAVE_PRAGMA_WEAK)
  #pragma weak MPI_File_set_size = PMPI_File_set_size
  #elif defined(HAVE_PRAGMA_HP_SEC_DEF)
  #pragma _HP_SECONDARY_DEF PMPI_File_set_size MPI_File_set_size
  #elif defined(HAVE_PRAGMA_CRI_DUP)
  #pragma _CRI duplicate MPI_File_set_size as PMPI_File_set_size
  /* end of weak pragmas */
  #elif defined(HAVE_WEAK_ATTRIBUTE)
  int MPI_File_set_size(MPI_File fh, MPI_Offset size) __attribute__((weak,alias("PMPI_File_set_size")));
  #endif
  
  /* Include mapping from MPI->PMPI */
  #define MPIO_BUILD_PROFILING
  #include "mpioprof.h"
  #endif
  
  /*@
      MPI_File_set_size - Sets the file size
  
  Input Parameters:
  . fh - file handle (handle)
  . size - size to truncate or expand file (nonnegative integer)
  
  .N fortran
  @*/
  int MPI_File_set_size(MPI_File fh, MPI_Offset size)
  {
      int error_code;
      ADIO_File adio_fh;
      static char myname[] = "MPI_FILE_SET_SIZE";
      MPI_Offset tmp_sz, max_sz, min_sz;
  
  #ifdef MPI_hpux
      int fl_xmpi;
  
      HPMP_IO_START(fl_xmpi, BLKMPIFILESETSIZE, TRDTBLOCK, adio_fh,
  		  MPI_DATATYPE_NULL, -1);
  #endif /* MPI_hpux */
  
      MPIU_THREAD_CS_ENTER(ALLFUNC,);
  
      adio_fh = MPIO_File_resolve(fh);
  
      /* --BEGIN ERROR HANDLING-- */
      MPIO_CHECK_FILE_HANDLE(adio_fh, myname, error_code);
      MPIO_CHECK_NOT_SEQUENTIAL_MODE(adio_fh, myname, error_code);
  
      if (size < 0) {
  	error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
  					  myname, __LINE__, MPI_ERR_ARG,
  					  "**iobadsize", 0);
  	error_code = MPIO_Err_return_file(adio_fh, error_code);
  	goto fn_exit;
      }
      MPIO_CHECK_WRITABLE(fh, myname, error_code);
      /* --END ERROR HANDLING-- */
  
      tmp_sz = size;
      MPI_Allreduce(&tmp_sz, &max_sz, 1, ADIO_OFFSET, MPI_MAX, adio_fh->comm);
      MPI_Allreduce(&tmp_sz, &min_sz, 1, ADIO_OFFSET, MPI_MIN, adio_fh->comm);
  
      /* --BEGIN ERROR HANDLING-- */
      if (max_sz != min_sz) {
  	error_code = MPIO_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE,
  					  myname, __LINE__, MPI_ERR_ARG,
  					  "**notsame", 0);
  	error_code = MPIO_Err_return_file(adio_fh, error_code);
  	goto fn_exit;
      }
      /* --END ERROR HANDLING-- */
  
      if (!ADIO_Feature(adio_fh, ADIO_SCALABLE_RESIZE)) {
  	/* rare stupid file systems (like NFS) need to carry out resize on all
  	 * processes */
  	ADIOI_TEST_DEFERRED(adio_fh, "MPI_File_set_size", &error_code);
      }
  
      ADIO_Resize(adio_fh, size, &error_code);
      /* TODO: what to do with error code? */
  
      /* --BEGIN ERROR HANDLING-- */
      if (error_code != MPI_SUCCESS)
  	error_code = MPIO_Err_return_file(adio_fh, error_code);
      /* --END ERROR HANDLING-- */
  
  #ifdef MPI_hpux
      HPMP_IO_END(fl_xmpi, adio_fh, MPI_DATATYPE_NULL, -1);
  #endif /* MPI_hpux */
  
  fn_exit:
      MPIU_THREAD_CS_EXIT(ALLFUNC,);
  
      return error_code;
  }
  