petsc-3.11.4 2019-09-28
PetscBinaryRead
Reads from a binary file.
Synopsis
PetscErrorCode PetscBinaryRead(int fd,void *p,PetscInt n,PetscDataType type)
Not Collective
Input Parameters
| fd | - the file
|
| n | - the number of items to read
|
| type | - the type of items to read (PETSC_INT, PETSC_DOUBLE or PETSC_SCALAR)
|
Output Parameters
p -the buffer
Notes
PetscBinaryRead() uses byte swapping to work on all machines; the files
are written to file ALWAYS using big-endian ordering. On small-endian machines the numbers
are converted to the small-endian format when they are read in from the file.
When PETSc is ./configure with --with-64bit-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-64bit-indices
is used.
See Also
PetscBinaryWrite(), PetscBinaryOpen(), PetscBinaryClose(), PetscViewerBinaryGetDescriptor(), PetscBinarySynchronizedWrite(),
PetscBinarySynchronizedRead(), PetscBinarySynchronizedSeek()
Level
developer
Location
src/sys/fileio/sysio.c
Examples
src/vec/vec/examples/tutorials/ex6.c.html
src/vec/vec/examples/tutorials/ex6f.F90.html
src/dm/examples/tutorials/ex15.c.html
src/ksp/ksp/examples/tutorials/ex54f.F90.html
Index of all Sys routines
Table of Contents for all manual pages
Index of all manual pages