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This commint adds a new command line parameter to sytemd-coredump. The
parameter should be mappend to core_pattern's placeholder %h - hostname.
The field _HOSTNAME holds the name from the kernel's namespaces which might be
different then the one comming from process' namespaces.
It is true that the real hostname is usually available in the field
COREDUMP_ENVIRON (environment variables) but I believe it is more reliable to
use the value passed by kernel.
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The length of iovec is no longer static and hence I corrected the declarations
of the functions set_iovec_field and set_iovec_field_free.
Thank you @yuwata and @poettering!
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With this change processing/saving of coredumps takes the RLIMIT_CORE resource limit of the crashing process into
account, given the user control whether specific processes shall core dump or not, and how large to make the core dump.
Note that this effectively disables core-dumping for now, as RLIMIT_CORE defaults to 0 (i.e. is disabled) for all
system processes.
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That way we'll get the PID on the host, rather than the one in a PID
namespace. Which should make the coredump handler less confusing.
Fixes #1930.
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