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include module type of struct include Sys end

val argv : string array

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.

val executable_name : string

The name of the file containing the executable currently running. This name may be absolute or relative to the current directory, depending on the platform and whether the program was compiled to bytecode or a native executable.

val file_exists : string -> bool

Test if a file with the given name exists.

val is_directory : string -> bool

Returns true if the given name refers to a directory, false if it refers to another kind of file. Raise Sys_error if no file exists with the given name.

since 3.10.0

val remove : string -> unit

Remove the given file name from the file system.

val rename : string -> string -> unit

Rename a file. rename oldpath newpath renames the file called oldpath, giving it newpath as its new name, moving it between directories if needed. If newpath already exists, its contents will be replaced with those of oldpath. Depending on the operating system, the metadata (permissions, owner, etc) of newpath can either be preserved or be replaced by those of oldpath.

since 4.06 concerning the "replace existing file" behavior

val command : string -> int

Execute the given shell command and return its exit code.

val time : unit -> float

Return the processor time, in seconds, used by the program since the beginning of execution.

val chdir : string -> unit

Change the current working directory of the process.

val getcwd : unit -> string

Return the current working directory of the process.

val readdir : string -> string array

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.

val interactive : bool ref

This reference is initially set to false in standalone programs and to true if the code is being executed under the interactive toplevel system ocaml.

val os_type : string

Operating system currently executing the OCaml program. One of

"Unix" (for all Unix versions, including Linux and Mac OS X),
"Win32" (for MS-Windows, OCaml compiled with MSVC++ or Mingw),
"Cygwin" (for MS-Windows, OCaml compiled with Cygwin).

type backend_type = Sys.backend_type =

| Native
| Bytecode
| Other of string

Currently, the official distribution only supports Native and Bytecode, but it can be other backends with alternative compilers, for example, javascript.

since 4.04.0

val backend_type : backend_type

Backend type currently executing the OCaml program.

since 4.04.0

val unix : bool

True if Sys.os_type = "Unix".

since 4.01.0

val win32 : bool

True if Sys.os_type = "Win32".

since 4.01.0

val cygwin : bool

True if Sys.os_type = "Cygwin".

since 4.01.0

val word_size : int

Size of one word on the machine currently executing the OCaml program, in bits: 32 or 64.

val int_size : int

Size of int, in bits. It is 31 (resp. 63) when using OCaml on a 32-bit (resp. 64-bit) platform. It may differ for other implementations, e.g. it can be 32 bits when compiling to JavaScript.

since 4.03.0

val big_endian : bool

Whether the machine currently executing the Caml program is big-endian.

since 4.00.0

val max_string_length : int

Maximum length of strings and byte sequences.

val max_array_length : int

Maximum length of a normal array (i.e. any array whose elements are not of type float). The maximum length of a float array is max_floatarray_length if OCaml was configured with --enable-flat-float-array and max_array_length if configured with --disable-flat-float-array.

val max_floatarray_length : int

Maximum length of a floatarray. This is also the maximum length of a float array when OCaml is configured with --enable-flat-float-array.

val runtime_variant : unit -> string

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.

since 4.03.0

val runtime_parameters : unit -> string

Return the value of the runtime parameters, in the same format as the contents of the OCAMLRUNPARAM environment variable.

since 4.03.0

Signal handling

type signal_behavior = Sys.signal_behavior =

| Signal_default
| Signal_ignore
| Signal_handle of int -> unit

What to do when receiving a signal:

Signal_default: take the default behavior (usually: abort the program)
Signal_ignore: ignore the signal
Signal_handle f: call function f, giving it the signal number as argument.

val signal : int -> signal_behavior -> signal_behavior

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. If the signal number is invalid (or not available on your system), an Invalid_argument exception is raised.

val set_signal : int -> signal_behavior -> unit

Same as Sys.signal but return value is ignored.

Signal numbers for the standard POSIX signals.

val sigabrt : int

Abnormal termination

val sigalrm : int

Timeout

val sigfpe : int

Arithmetic exception

val sighup : int

Hangup on controlling terminal

val sigill : int

Invalid hardware instruction

val sigint : int

Interactive interrupt (ctrl-C)

val sigkill : int

Termination (cannot be ignored)

val sigpipe : int

Broken pipe

val sigquit : int

Interactive termination

val sigsegv : int

Invalid memory reference

val sigterm : int

Termination

val sigusr1 : int

Application-defined signal 1

val sigusr2 : int

Application-defined signal 2

val sigchld : int

Child process terminated

val sigcont : int

Continue

val sigstop : int

Stop

val sigtstp : int

Interactive stop

val sigttin : int

Terminal read from background process

val sigttou : int

Terminal write from background process

val sigvtalrm : int

Timeout in virtual time

val sigprof : int

Profiling interrupt

val sigbus : int

Bus error

since 4.03

val sigpoll : int

Pollable event

since 4.03

val sigsys : int

Bad argument to routine

since 4.03

val sigtrap : int

Trace/breakpoint trap

since 4.03

val sigurg : int

Urgent condition on socket

since 4.03

val sigxcpu : int

Timeout in cpu time

since 4.03

val sigxfsz : int

File size limit exceeded

since 4.03

exception Break

Exception raised on interactive interrupt if Sys.catch_break is on.

val catch_break : bool -> unit

catch_break governs whether interactive interrupt (ctrl-C) terminates the program or raises the Break exception. Call catch_break true to enable raising Break, and catch_break false to let the system terminate the program on user interrupt.

val ocaml_version : string

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.

val enable_runtime_warnings : bool -> unit

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.

since 4.03.0

val runtime_warnings_enabled : unit -> bool

Return whether runtime warnings are currently enabled.

since 4.03.0

Optimization

val opaque_identity : 'a -> 'a

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

since 4.03.0

val getenv : string -> string

val getenv_opt : string -> string option

exception Unknown_environment_variable of string

val shell_var_regexp : Str.regexp

val normalize_env_var : string -> string

val expand : string -> string