/usr/include/idas/idas_spbcgs.h is in libsundials-serial-dev 2.5.0-3+b3.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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* -----------------------------------------------------------------
* $Revision: 1.3 $
* $Date: 2007/07/05 19:10:36 $
* -----------------------------------------------------------------
* Programmer(s): Aaron Collier and Radu Serban @ LLNL
* -----------------------------------------------------------------
* Copyright (c) 2004, The Regents of the University of California.
* Produced at the Lawrence Livermore National Laboratory.
* All rights reserved.
* For details, see the LICENSE file.
* -----------------------------------------------------------------
* This is the public header file for the IDAS scaled preconditioned
* Bi-CGSTAB linear solver module, IDASPBCG.
*
* Part I contains function prototypes for using IDASPBCG on forward
* problems (DAE integration and/or FSA)
*
* Part II contains function prototypes for using IDASPBCG on adjoint
* (backward) problems
* -----------------------------------------------------------------
*/
#ifndef _IDASSPBCG_H
#define _IDASSPBCG_H
#ifdef __cplusplus /* wrapper to enable C++ usage */
extern "C" {
#endif
#include <idas/idas_spils.h>
#include <sundials/sundials_spbcgs.h>
/*
* -----------------------------------------------------------------
* PART I - forward problems
* -----------------------------------------------------------------
*/
/*
* -----------------------------------------------------------------
* Function : IDASpbcg
* -----------------------------------------------------------------
* A call to the IDASpbcg function links the main integrator with
* the IDASPBCG linear solver module. Its parameters are as
* follows:
*
* IDA_mem is the pointer to memory block returned by IDACreate.
*
* maxl is the maximum Krylov subspace dimension, an
* optional input. Pass 0 to use the default value.
* Otherwise pass a positive integer.
*
* The return values of IDASpbcg are:
* IDASPILS_SUCCESS if successful
* IDASPILS_MEM_NULL if the IDAS memory was NULL
* IDASPILS_MEM_FAIL if there was a memory allocation failure
* IDASPILS_ILL_INPUT if there was illegal input.
* The above constants are defined in idas_spils.h
*
* -----------------------------------------------------------------
*/
SUNDIALS_EXPORT int IDASpbcg(void *ida_mem, int maxl);
/*
* -----------------------------------------------------------------
* PART II - backward problems
* -----------------------------------------------------------------
*/
SUNDIALS_EXPORT int IDASpbcgB(void *ida_mem, int which, int maxlB);
#ifdef __cplusplus
}
#endif
#endif
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