HP Fortran Programmer's Guide (B3908-90031; September 2011)

Controlling data storage
Sharing data among programs
Chapter 3116
$ ipcs -m
IPC status from /dev/kmem as of Fri Mar 21 15:55:29 1997
T ID KEY MODE OWNER GROUP
Shared Memory:
m 0 0x4119c72b --rw-rw-rw- root root
m 1 0x4e180002 --rw-rw-rw- root root
m 2 0x41187bf4 --rw-rw-rw- root root
m 3 0x00000000 --rw------- root sys
m 7004 0x43186ea0 --rw-rw-rw- daemon daemon
m 6005 0x73636231 --rw-rw-rw- ed lang
Now run the second program in the second process:
$ wake_up
At this point, the program executing in the first process outputs the following and completes execution:
I'm up!
The following command line confirms that the shared memory segment was released:
$ ipcs -m
IPC status from /dev/kmem as of Fri Mar 21 15:55:29 1997
T ID KEY MODE OWNER GROUP
Shared Memory:
m 0 0x4119c72b --rw-rw-rw- root root
m 1 0x4e180002 --rw-rw-rw- root root
m 2 0x41187bf4 --rw-rw-rw- root root
m 3 0x00000000 --rw------- root sys
m 7004 0x43186ea0 --rw-rw-rw- daemon daemon
For information about sharing data between Fortran program units and C functions within the same
program, see “Sharing data” on page 200. The HP Fortran Programmer's Reference provides detailed
information about the COMMON statement and about the $HP$ SHARED_COMMON directive. Refer to the
shmop(2) man page for information about HP-UX shared memory operations.