semaphore

[mmcds]

I am using SuSE Linux and have reached my array limit for semaphores. I did the ipcs -u to see what I am using and ipcs -l to show my limits. I tried the ipcs -s to see what all arrays are being used and it is showing this

------ Semaphore Arrays --------
key semid owner perms nsems
0x00000000 360448 nobody 600 1
0x00000000 3997697 nobody 600 1
0x00000000 4030466 nobody 600 1

My question is how do I know what semid is belonging to what process that is running on my machine that I can safely destroy to get some of my arrays back?

 

[macd68]

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ipc.h> 
#include <sys/shm.h>


int main(int argc, char **argv) {
int ans;
struct shmid_ds bb;

                                if (argc != 2) {printf("Please provide a shared memory id for creator pid....\n"); exit(1);}
                                ans = atoi(argv[1]);
                                shmctl(ans,IPC_STAT,&bb);
                                printf("Originating process was: %d\n",bb.shm_cpid);
                                return 0;
}

Not nearly fullproof but gives you an idea. I know of no other tool that even gives you this cross-platform.

for all in `ipcs | awk '/[0-9]+/ {print $2}'` ; do ./quick_ipc.out $all ; done
Originating process was: 26110
Originating process was: 28376
Originating process was: 28376
Originating process was: 28076
Originating process was: 28376
Originating process was: 28376
Originating process was: 4453
Originating process was: 4453
Originating process was: 4453

 

[mmcds]

hey macd68. Is this code part of a shell script or part of a kernel tweak?

 

[mmcds]

nevermind on my previous question.. I figured it out with a C program. Not used to compiling C programs. Thanks for the suggestion to my original question.