Ravinandan Arakali (rarakali) wrote:
Hi,
When a process dumps core, the do_coredump() initiates the core
file generation. Is this operation synchronous(does the kernel
wait for core to be completely written to disk) ?
The operations whereby
(1) a process is in the process of exiting while;
(2) the kernel is doing a coredump
is asynchronous with respect to each other, since the process could have
received an abort signal while the the kernel initiated the core dump.
Basically, if I have the parent process waiting for exit of
child which dumped core, can the parent access the core immediately
on receipt of "child exit" message ? Is it possible that the
core is still in the process of being written ? If so, what's
the event the parent needs to wait for to be assured of a complete
core.
When a child exits, check if the core dump file is still opened by a handle
(HINT: lsof).
AFAICS from the kernel code, the core dump data or file routine is mutexed
to ensure that there is only one process handling the core dump file.
You could check if there are still open file handles on the dump. If there
are none, it means that the dump had been completed.
HTH.
Best Regards,
Carlo
--
Carlo Florendo
Softare Engineer/Network Co-Administrator
Astra Philippines Inc.
UP-Ayala Technopark, Diliman 1101, Quezon City
Philippines
http://www.astra.ph
--
The Astra Group of Companies
5-3-11 Sekido, Tama City
Tokyo 206-0011, Japan
http://www.astra.co.jp
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
[Index of Archives]
[Kernel Newbies]
[Netfilter]
[Bugtraq]
[Photo]
[Stuff]
[Gimp]
[Yosemite News]
[MIPS Linux]
[ARM Linux]
[Linux Security]
[Linux RAID]
[Video 4 Linux]
[Linux for the blind]
[Linux Resources]
