This module defines higher-level functions than the Unix module and should, wherever possible, be used rather than the Unix module to ensure portability.
The command line arguments given to the process. The first element is the command name used to invoke the program. The following elements are the command-line arguments given to the program.
Rename a file. The first argument is the old name and the second is the new name. If there is already another file under the new name, rename may replace it, or raise an exception, depending on your operating system.
Return the names of all files present in the given directory. Names denoting the current directory and the parent directory ("." and ".." in Unix) are not returned. Each string in the result is a file name rather than a complete path. There is no guarantee that the name strings in the resulting array will appear in any specific order; they are not, in particular, guaranteed to appear in alphabetical order.
Currently, the official distribution only supports Native and Bytecode, but it can be other backends with alternative compilers, for example, javascript.
Size of an int. It is 31 bits (resp. 63 bits) when using the OCaml compiler on a 32 bits (resp. 64 bits) platform. It may differ for other compilers, e.g. it is 32 bits when compiling to JavaScript.
Maximum length of a normal array. The maximum length of a float array is max_array_length/2 on 32-bit machines and max_array_length on 64-bit machines.
Return the name of the runtime variant the program is running on. This is normally the argument given to -runtime-variant at compile time, but for byte-code it can be changed after compilation.
Set the behavior of the system on receipt of a given signal. The first argument is the signal number. Return the behavior previously associated with the signal.
catch_break governs whether interactive interrupt (ctrl-C) terminates the program or raises Break. Call catch_break true to enable raising Break, and catch_break false to let the system terminate the program on user interrupt.
ocaml_version is the version of OCaml. It is a string of the form "major.minor[.patchlevel][+additional-info]", where major, minor, and patchlevel are integers, and additional-info is an arbitrary string. The [.patchlevel] and [+additional-info] parts may be absent.
Control whether the OCaml runtime system can emit warnings on stderr. Currently, the only supported warning is triggered when a channel created by open_* functions is finalized without being closed. Runtime warnings are enabled by default.
For the purposes of optimization, opaque_identity behaves like an unknown (and thus possibly side-effecting) function.
At runtime, opaque_identity disappears altogether.
A typical use of this function is to prevent pure computations from being optimized away in benchmarking loops. For example:
for _round = 1 to 100_000 do
ignore (Sys.opaque_identity (my_pure_computation ()))
done
The compiler primitive was added to OCaml 4.03, but we emulate it under 4.02 using the -opaque compilation flag. There is no easy way for Batteries to emulate it correctly under older OCaml versions.