Closing shared files |
 |
Prior to Release 4.5, if a conflict occurred between the
disposition specifications of multiple FCLOSE intrinsic
calls on a shared file, the disposition specification that
had the lower positive-integer value always took precedence
when the file was finally closed.
Beginning with Release 4.5, this behavior is modified if one
of the processes sharing the file invokes the POSIX.1/iX
library function unlink() to purge the file from the
directory. Upon successful completion of the unlink()
call, the file is moved from the permanent file domain to
the new file domain. When this occurs, the behavior of the
FCLOSE intrinsic on the shared file may change.
Care must be taken only in an environment where processes
using the FCLOSE intrinsic share files with processes
calling the unlink() C library function available
through the MPE/iX Developer's Kit.
