This file is indexed.

/usr/lib/petscdir/3.1/include/finclude/ftn-custom/petscviewer.h90 is in libpetsc3.1-dev 3.1.dfsg-11ubuntu1.

This file is owned by root:root, with mode 0o644.

The actual contents of the file can be viewed below.

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#if !defined(PETSC_USE_FORTRAN_MODULES) 
#include "finclude/ftn-custom/petscviewerdef.h90"
#endif
#include "finclude/ftn-custom/petscviewerhide.h90"

      Interface PetscViewerBinaryWrite
        Subroutine PetscViewerBinaryWriteInt(v,a,cnt,tmp,ierr)
          USE_PETSC_HIDE
          PETSCVIEWER_HIDE v
          PetscInt a(*)
          PetscInt cnt
          PetscTruth tmp
          PetscErrorCode ierr
        End Subroutine
        
        Subroutine PetscViewerBinaryWriteScalar(v,a,cnt,tmp,ierr)
          USE_PETSC_HIDE
          PETSCVIEWER_HIDE v
          PetscScalar a(*)
          PetscInt cnt
          PetscTruth tmp
          PetscErrorCode ierr
        End Subroutine

#if defined(PETSC_USE_COMPLEX)        
        Subroutine PetscViewerBinaryWriteReal(v,a,cnt,tmp,ierr)
          USE_PETSC_HIDE
          PETSCVIEWER_HIDE v
          PetscReal a(*)
          PetscInt cnt
          PetscTruth tmp
          PetscErrorCode ierr
        End Subroutine
#endif
        
        Subroutine PetscViewerBinaryReadInt(v,a,cnt,ierr)
          USE_PETSC_HIDE
          PETSCVIEWER_HIDE v
          PetscInt a(*)
          PetscInt cnt
          PetscErrorCode ierr
        End Subroutine

        Subroutine PetscViewerBinaryReadScalar(v,a,cnt,ierr)
          USE_PETSC_HIDE
          PETSCVIEWER_HIDE v
          PetscScalar a(*)
          PetscInt cnt
          PetscErrorCode ierr
        End Subroutine

#if defined(PETSC_USE_COMPLEX)        
        Subroutine PetscViewerBinaryReadReal(v,a,cnt,ierr)
          USE_PETSC_HIDE
          PETSCVIEWER_HIDE v
          PetscReal a(*)
          PetscInt cnt
          PetscErrorCode ierr
        End Subroutine
#endif

      End Interface