PetscBinarySynchronizedSeek#
Moves the file pointer on a PETSc binary file.
Synopsis#
PetscErrorCode PetscBinarySynchronizedSeek(MPI_Comm comm, int fd, off_t off, PetscBinarySeekType whence, off_t *offset)
Input Parameters#
fd - the file
whence - if
PETSC_BINARY_SEEK_SET
then size is an absolute location in the file ifPETSC_BINARY_SEEK_CUR
then size is offset from current location ifPETSC_BINARY_SEEK_END
then size is offset from end of fileoff - number of bytes to move. Use
PETSC_BINARY_INT_SIZE
,PETSC_BINARY_SCALAR_SIZE
, etc. in your calculation rather thansizeof()
to compute byte lengths.
Output Parameter#
offset - new offset in file
Note#
Integers are stored on the file as 32 long, regardless of whether
they are stored in the machine as 32 or 64, this means the same
binary file may be read on any machine. Hence you CANNOT use sizeof()
to determine the offset or location.
See Also#
PetscBinaryRead()
, PetscBinaryWrite()
, PetscBinaryOpen()
, PetscBinarySynchronizedWrite()
, PetscBinarySynchronizedRead()
,
PetscBinarySynchronizedSeek()
Level#
developer
Location#
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages