Messages in this thread | | | Date | Fri, 9 Aug 2002 12:37:25 +0200 | From | Andries Brouwer <> | Subject | Re: [PATCH] Linux-2.5 fix/improve get_pid() |
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On Fri, Aug 09, 2002 at 11:32:33AM +0100, Alan Cox wrote:
> Its much simpler to put max_pid into /proc/sys/kernel. That way we can > boot with 32000 process ids, which will ensure ancient stuff which has > 16bit pid_t (old old libc) and also any old kernel interfaces which > expose it - does ipc ?
I don't think it is a good idea to add lots of almost meaningless knobs. This is not something one would like to adapt dynamically. Someone who needs 16bit pid_t can compile her own kernel with a suitable value of PID_MAX.
There is no old old libc with 16bit pid_t, I think. I have libc 4.4.1 here with typedef int pid_t; I have Linux 0.01 here with typedef int pid_t;
Yes, ipc exposed pid in a 16-bit field, namely in the fields msg_lspid, msg_lrpid, shm_cpid, shm_lpid. Two years ago I found all occurrences in all Linux sources, but I forgot the details of the result; I do not recall significant occurrences. Maybe someone will repeat this big grep.
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