PETSc version v3.15.4-939-g9da6b9be94
Writes to a binary file.
PetscErrorCode PetscBinaryWrite(int fd,const void *p,PetscInt n,PetscDataType type)
|fd ||- the file
|p ||- the buffer
|n ||- the number of items to write
|type ||- the type of items to read (PETSC_INT, PETSC_DOUBLE or PETSC_SCALAR)
PetscBinaryWrite() uses byte swapping to work on all machines; the files
are written using big-endian ordering to the file. On little-endian machines the numbers
are converted to the big-endian format when they are written to disk.
When PETSc is ./configure with --with-64-bit-indices the integers are written to the
file as 64 bit integers, this means they can only be read back in when the option --with-64-bit-indices
If running with __float128 precision the output is in __float128 unless one uses the -binary_write_double option
The Buffer p should be read-write buffer, and not static data.
This way, byte-swapping is done in-place, and then the buffer is
written to the file.
This routine restores the original contents of the buffer, after
it is written to the file. This is done by byte-swapping in-place
the second time.
Because byte-swapping may be done on the values in data it cannot be declared const
PetscBinaryRead(), PetscBinaryOpen(), PetscBinaryClose(), PetscViewerBinaryGetDescriptor(), PetscBinarySynchronizedWrite(),
Index of all Sys routines
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Index of all manual pages