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* tapset-procfs.cxx (procfs_derived_probe::procfs_derived_probe): Added
'maxsize_val' initialization.
(procfs_derived_probe::join_group): Updated '_stp_procfs_data'
definition and added STP_PROCFS_BUFSIZE.
(procfs_derived_probe_group::emit_module_decls): Emits structure to
contain procfs file buffers. Initializes '.bufsize' structure member.
(procfs_var_expanding_visitor::visit_target_symbol): Uses 'bufsize' for
maximum buffer size instead of using MAXSTRINGLEN.
(procfs_builder::build): Looks for '.maxsize(NNN)' parameter.
(register_tapset_procfs): Added '.maxsize(NNN)' parameter binding.
* runtime/procfs-probes.c (stap_procfs_probe): Converted 'buffer' to a
pointer and added 'bufsize' member.
* testsuite/semko/procfs13.stp: New testcase.
* testsuite/semko/procfs14.stp: Ditto.
* testsuite/semko/procfs15.stp: Ditto.
* testsuite/systemtap.base/procfs_maxsize.exp: Ditto.
* testsuite/systemtap.base/procfs.exp: Minor fix.
* stapprobes.3stap.in: Added '.maxsize(NNN)' documentation.
* stap.1.in: Added STP_PROCFS_BUFSIZE documentation.
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