API Process

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This API provides rudimentary process management. It is used mainly by the io module to provide individual standard input and output to individual programs.

• process.load(path:string[, env:table[, init:function[, name:string]]]):coroutine
  Loads a Lua script from the specified absolute path and sets it up as a process.
  It will be loaded with a custom environment, to avoid cluttering the callers/global environment. This environment will have access to anything in the specified environment, or the default (top level) environment if none is given.
  If an init function is specified, that method is called the first time the resulting coroutine is executed, and run before the actual program is started. This allows fine-tuning of the programs environment.
  If a name is specified, that is the name the process will specify in process.running. It will be nil otherwise.
• process.running([level: number]): string, table, string
  Returns the path to the currently running program (i.e. the last process created via process.load). The level can optionally be provided to get parent processes. It defaults to 1, the current program. 2 is the current program's parent (the one that called process.load to start the current program) and so on.
  The second returned value is the environment of the process, i.e. the table created for it to use as one.
  The third returned value is the 'name' of the process, i.e. the fourth parameter to process.load. For programs started via the shell this will ususally be the original command. E.g. for ls -l, the first returned value will be ls, while this value will be ls -l.