/* -*- Mode: C; c-basic-offset:4 ; indent-tabs-mode:nil ; -*- */
/* 
 *
 *   Copyright (C) 1997 University of Chicago. 
 *   See COPYRIGHT notice in top-level directory.
 */

#include "ad_hfs.h"
#include "adio_extern.h"

#ifndef HAVE_LSEEK64
#define lseek64 lseek
#endif
void ADIOI_HFS_Fcntl(ADIO_File fd, int flag, ADIO_Fcntl_t *fcntl_struct, int *error_code)
{
    int  i, ntimes, err;
    ADIO_Offset curr_fsize, alloc_size, size, len, done;
    ADIO_Status status;
    char *buf;
#ifndef PRINT_ERR_MSG
    static char myname[] = "ADIOI_HFS_FCNTL";
#endif

    switch(flag) {
    case ADIO_FCNTL_GET_FSIZE:
	fcntl_struct->fsize = lseek64(fd->fd_sys, 0, SEEK_END);
#ifdef HPUX
	if (fd->fp_sys_posn != -1) 
	     lseek64(fd->fd_sys, fd->fp_sys_posn, SEEK_SET);
/* not required in SPPUX since there we use pread/pwrite */
#endif
	if (fcntl_struct->fsize == -1) {
#ifdef MPICH
	    *error_code = MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE, myname, __LINE__, MPI_ERR_IO, "**io", 
		"**io %s", strerror(errno));
#elif defined(PRINT_ERR_MSG)
		*error_code = MPI_ERR_UNKNOWN;
#else /* MPICH-1 */
		*error_code = MPIR_Err_setmsg(MPI_ERR_IO, MPIR_ADIO_ERROR,
				myname, "I/O Error", "%s", strerror(errno));
		ADIOI_Error(fd, *error_code, myname);	    
#endif
	}
	else *error_code = MPI_SUCCESS;
	break;

    case ADIO_FCNTL_SET_DISKSPACE:
	/* will be called by one process only */

#ifdef HPUX
	err = prealloc64(fd->fd_sys, fcntl_struct->diskspace);
	/* prealloc64 works only if file is of zero length */
	if (err && (errno != ENOTEMPTY)) {
#ifdef MPICH
	    *error_code = MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE, myname, __LINE__, MPI_ERR_IO, "**io", 
		"**io %s", strerror(errno));
#elif defined(PRINT_ERR_MSG)
	    *error_code = MPI_ERR_UNKNOWN;
#else
	    *error_code = MPIR_Err_setmsg(MPI_ERR_IO, MPIR_ADIO_ERROR,
			      myname, "I/O Error", "%s", strerror(errno));
	    ADIOI_Error(fd, *error_code, myname);
#endif
	    return;
	}
	if (err && (errno == ENOTEMPTY)) {
#endif

#ifdef SPPUX
	/* SPPUX has no prealloc64. therefore, use prealloc
           if size < (2GB - 1), otherwise use long method. */
        if (fcntl_struct->diskspace <= 2147483647) {
	    err = prealloc(fd->fd_sys, (off_t) fcntl_struct->diskspace);
	    if (err && (errno != ENOTEMPTY)) {
#ifdef MPICH
		*error_code = MPIR_Err_create_code(MPI_SUCCESS, MPIR_ERR_RECOVERABLE, myname, __LINE__, MPI_ERR_IO, "**io",
		    "**io %s", strerror(errno));
#elif defined(PRINT_ERR_MSG)
    	        *error_code = MPI_ERR_UNKNOWN;
#else
		*error_code = MPIR_Err_setmsg(MPI_ERR_IO, MPIR_ADIO_ERROR,
			      myname, "I/O Error", "%s", strerror(errno));
		ADIOI_Error(fd, *error_code, myname);
#endif
	        return;
	    }
	}    

	if ((fcntl_struct->diskspace > 2147483647) || 
	    (err && (errno == ENOTEMPTY))) {
#endif
		ADIOI_GEN_Prealloc(fd,fcntl_struct->diskspace, error_code);
	    }
	    ADIOI_Free(buf);
#ifdef HPUX
	    if (fd->fp_sys_posn != -1) 
		lseek64(fd->fd_sys, fd->fp_sys_posn, SEEK_SET);
	    /* not required in SPPUX since there we use pread/pwrite */
#endif
	}
	*error_code = MPI_SUCCESS;
	break;

    case ADIO_FCNTL_SET_ATOMICITY:
	fd->atomicity = (fcntl_struct->atomicity == 0) ? 0 : 1;
	*error_code = MPI_SUCCESS;
	break;

    default:
	FPRINTF(stderr, "Unknown flag passed to ADIOI_HFS_Fcntl\n");
	MPI_Abort(MPI_COMM_WORLD, 1);
    }
}