Required by Silo library + PDB driver
--------------------------------------
fstat or fstat64
stat or stat64
lseek
open, close
read, write
exit
time (PDB driver could probably be removed)

Required by Silo library + HDF5 driver
--------------------------------------
Note: most of these come from HDF5 library.
Some may be optional or removeable at expense of loss
of minor features. Asked HDF Group for analysis.
time
getpwuid
getuid
fsync
write
read
access
fstat
fileno
signal
sigprocmask
gettimeofday
getcwd
open
lseek
read
close
lstat
stat
fstat
ftruncate

Required by Silo Library compression features
-------------------------------------
access (could maybe replace with another, used by compression)
flush (used by compression feature)

Required by Silo tools
----------------------
Note: not typically necessary to run tools on compute nodes
ioctl
kill
getpid
sigaction
passwd
access
exit
gettimeofday

Required by Silo tests
----------------------
Note: not all Silo tests use all these
unlink
mkdir
rmdir
gettimeofday
exit
lseek
write
read
close
open
