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== `pid.hpp`
[#pid]
[source,cpp]
----
//An integral type representing a process id.
typedef implementation_defined pid_type;
// Get the process id of the current process.
pid_type current_pid();
// List all available pids.
std::vector<pid_type> all_pids(boost::system::error_code & ec);
std::vector<pid_type> all_pids();
// return parent pid of pid.
pid_type parent_pid(pid_type pid, boost::system::error_code & ec);
pid_type parent_pid(pid_type pid);
// return child pids of pid.
std::vector<pid_type> child_pids(pid_type pid, boost::system::error_code & ec);
std::vector<pid_type> child_pids(pid_type pid);
----
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