System operations

In system.cecil:

method exit(error_code@:int):none; 
method object_size(obj:any):int; 
method individual_object_size(obj:any):indexed[int]; 
method object_size_histogram(obj:any):int; 
method PIC_statistics():void; 
method detailed_PIC_statistics():void; 
method cpu_time():int;
- Current CPU time in milliseconds. 
method time(closure:&():void):int;
- CPU execution time of closure in milliseconds 
method benchmark_closure(cls:&():void):void; 

method system(s@:string):int; 
method system(s@:vstring):int; 
method system(s@:string, if_error:&(i:int):int):int; 
method breakpoint():void; 
method sys_breakpoint():void; 
concrete representation argv isa i_indexed[string];
- Unix command-line arguments 
method length(t@:argv):int; 
method fetch(t@:argv, i:int, if_absent:&():string):string; 

The system function invokes the Unix system system call with the given command, and passes the returned value to the user. The if_error closure is invoked if the system call returns a non-zero result.

concrete object env isa m_table_like[string,string]; 
method fetch(t@:env, name:string):string; 
method fetch_internal(t@:env, name@:vstring):string; 
method store(t@:env, n:string, v:string):void; 
method store_internal(t@:env, n@:vstring, v@:vstring):void; 
method garbage_collect():void; 
method print_heap():void; 
method process_size():int; 
method compile_date():string; 
method zero_runtime_counters():void; 
method print_and_zero_runtime_counters():void; 
method profiling_on():void; 
method profiling_off():void; 
method profile(c@closure:&():`T):T; 
method profile(b@:bool, c:&():`T):T; 

Unix environment variables can be read and modified.