I would like to find all shared memory segments used by a given process. I am especially interested in figuring out the shmid so i can use it in calls to shmctl().
On Solaris i would just read /proc/$PID/map to figure out that information (field pr_shmid). The contents of that file are defined by struct prmap_t in sys/procfs.
AIX also has a /proc/$PID/map file. There is also a struct prmap but unfortunately it is missing the pr_shmid field.
Any ideas how i can achieve this on AIX5.3+?
I don't know about AIX in particular, but I think the ipcs command is fairly standard where SysV IPC is supported, so I'd expect the ipcs -m command to give the appropriate information; parsing the output of that might be an option, if you can't find a better way.
svmon -P will list the process memory segments by type.
You can also use -S to see what PIDs are attached to a segment. with -S, first run ipcs -bmS, then take the SID w/o the 0x, and use it with
svmon -lS [SID]
That will return the PIDs attached.