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------ Shared Memory Segments --------
key        shmid      owner      perms      bytes      nattch     stat
+us
0x00000000 98304      root       600        67108864   20         dest
0x0052e2c1 65537      postgres   600        56         5
0xf102ee77 131074     XXXXXXX    700        65535      0

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use strict;
use IPC::SysV qw(IPC_PRIVATE S_IRUSR S_IWUSR SHM_RDONLY);
...
my $stat = ${shm}->stat;
&fl_die("Could not stat shared memory segment.") unless defined(${stat
+});
my $concount = ${stat}->nattch;

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0x00000000 393224     root       0          65535      0
0x00000000 425993     root       0          65535      0
...
0x00000000 524300     root       0          65535      0
0x00000000 557069     root       0          65535      0
0x00000000 589838     root       0          65535      0