RDoc for module Process (#8141)

Merged-By: peterzhu2118 <peter@peterzhu.ca>

process.c

@@ -8569,19 +8569,87 @@ proc_warmup(VALUE _)
 /*
  * Document-module: Process
  *
- *   The module contains several groups of functionality for handling OS processes:
+ * \Module +Process+ represents a process in the underlying operating system.
+ * Its methods support management of the current process and its child processes.
+ *
+ * == What's Here
+ *
+ * === Current-Process Getters
+ *
+ * - ::argv0: Returns the process name as a frozen string.
+ * - ::egid: Returns the effective group ID.
+ * - ::euid: Returns the effective user ID.
+ * - ::getpgrp: Return the process group ID.
+ * - ::getrlimit: Returns the resource limit.
+ * - ::gid: Returns the (real) group ID.
+ * - ::pid: Returns the process ID.
+ * - ::ppid: Returns the process ID of the parent process.
+ * - ::uid: Returns the (real) user ID.
+ *
+ * === Current-Process Setters
+ *
+ * - ::egid=: Sets the effective group ID.
+ * - ::euid=: Sets the effective user ID.
+ * - ::gid=: Sets the (real) group ID.
+ * - ::setproctitle: Sets the process title.
+ * - ::setpgrp: Sets the process group ID of the process to zero.
+ * - ::setrlimit: Sets a resource limit.
+ * - ::setsid: Establishes the process as a new session and process group leader,
+ *   with no controlling tty.
+ * - ::uid=: Sets the user ID.
+ *
+ * === Current-Process Execution
+ *
+ * - ::abort: Immediately terminates the process.
+ * - ::daemon: Detaches the process from its controlling terminal
+ *   and continues running it in the background as system daemon.
+ * - ::exec: Replaces the process by running a given external command.
+ * - ::exit: Initiates process termination by raising exception SystemExit
+ *   (which may be caught).
+ * - ::exit!: Immediately exits the process.
+ * - ::warmup: Notifies the Ruby virtual machine that the boot sequence
+ *   for the application is completed,
+ *   and that the VM may begin optimizing the application.
+ *
+ * === Child Processes
+ *
+ * - ::detach: Guards against a child process becoming a zombie.
+ * - ::fork: Creates a child process.
+ * - ::kill: Sends a given signal to processes.
+ * - ::spawn: Creates a child process.
+ * - ::wait, ::waitpid: Waits for a child process to exit; returns its process ID.
+ * - ::wait2, ::waitpid2: Waits for a child process to exit; returns its process ID and status.
+ * - ::waitall: Waits for all child processes to exit;
+ *   returns their process IDs and statuses.
+ *
+ * === \Process Groups
+ *
+ * - ::getpgid: Returns the process group ID for a process.
+ * - ::getpriority: Returns the scheduling priority
+ *   for a process, process group, or user.
+ * - ::getsid: Returns the session ID for a process.
+ * - ::groups: Returns an array of the group IDs
+ *   in the supplemental group access list for this process.
+ * - ::groups=: Sets the supplemental group access list
+ *   to the given array of group IDs.
+ * - ::initgroups: Initializes the supplemental group access list.
+ * - ::last_status: Returns the status of the last executed child process
+ *   in the current thread.
+ * - ::maxgroups: Returns the maximum number of group IDs allowed
+ *   in the supplemental group access list.
+ * - ::maxgroups=: Sets the maximum number of group IDs allowed
+ *   in the supplemental group access list.
+ * - ::setpgid: Sets the process group ID of a process.
+ * - ::setpriority: Sets the scheduling priority
+ *   for a process, process group, or user.
+ *
+ * === Timing
+ *
+ * - ::clock_getres: Returns the resolution of a system clock.
+ * - ::clock_gettime: Returns the time from a system clock.
+ * - ::times: Returns a Process::Tms object containing times
+ *   for the current process and its child processes.
  *
- *   * Low-level property introspection and management of the current process, like
- *     Process.argv0, Process.pid;
- *   * Low-level introspection of other processes, like Process.getpgid, Process.getpriority;
- *   * Management of the current process: Process.abort, Process.exit, Process.daemon, etc.
- *     (for convenience, most of those are also available as global functions
- *     and module functions of Kernel);
- *   * Creation and management of child processes: Process.fork, Process.spawn, and
- *     related methods;
- *   * Management of low-level system clock: Process.times and Process.clock_gettime,
- *     which could be important for proper benchmarking and other elapsed
- *     time measurement tasks.
  */
 
 void