Stdlib.Sys(3) OCaml library Stdlib.Sys(3) NAME Stdlib.Sys - no description Module Module Stdlib.Sys Documentation Module Sys : (module Stdlib__Sys) 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. Since 3.10 Raises Sys_error if no file exists with the given name. val is_regular_file : string -> bool Returns true if the given name refers to a regular file, false if it refers to another kind of file. Since 5.1 Raises Sys_error if no file exists with the given name. val remove : string -> unit Remove the given file name from the file system. val rename : string -> string -> unit Rename a file or directory. rename oldpath newpath renames the file or directory called oldpath , giving it newpath as its new name, moving it between (parent) directories if needed. If a file named 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 getenv : string -> string Return the value associated to a variable in the process environment. Raises Not_found if the variable is unbound. val getenv_opt : string -> string option Return the value associated to a variable in the process environment or None if the variable is unbound. Since 4.05 val command : string -> int Execute the given shell command and return its exit code. The argument of Sys.command is generally the name of a command followed by zero, one or several arguments, separated by whitespace. The given argument is interpreted by a shell: either the Windows shell cmd.exe for the Win32 ports of OCaml, or the POSIX shell sh for other ports. It can contain shell builtin commands such as echo , and also special characters such as file redirections > and < , which will be honored by the shell. Conversely, whitespace or special shell characters occurring in command names or in their arguments must be quoted or escaped so that the shell does not interpret them. The quoting rules vary between the POSIX shell and the Windows shell. The Filename.quote_command performs the appropriate quoting given a command name, a list of arguments, and optional file redirections. 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 mkdir : string -> int -> unit Create a directory with the given permissions. Since 4.12 val rmdir : string -> unit Remove an empty directory. Since 4.12 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 . Alert unsynchronized_access. The interactive status is a mutable global state. 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-w64), - "Cygwin" (for MS-Windows, OCaml compiled with Cygwin). type 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 val backend_type : backend_type Backend type currently executing the OCaml program. Since 4.04 val unix : bool True if Sys.os_type = "Unix" . Since 4.01 val win32 : bool True if Sys.os_type = "Win32" . Since 4.01 val cygwin : bool True if Sys.os_type = "Cygwin" . Since 4.01 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 val big_endian : bool Whether the machine currently executing the Caml program is big-endian. Since 4.00 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 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 Signal handling type 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] part was absent before version 3.08.0 and became mandatory from 3.08.0 onwards. The [(+|~)additional-info] part may be absent. val development_version : bool true if this is a development version, false otherwise. Since 4.14 type extra_prefix = | Plus | Tilde type extra_info = extra_prefix * string Since 4.14 type ocaml_release_info = { major : int ; minor : int ; patchlevel : int ; extra : extra_info option ; } Since 4.14 val ocaml_release : ocaml_release_info ocaml_release is the version of OCaml. Since 4.14 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 disabled by default. Since 4.03 Alert unsynchronized_access. The status of runtime warnings is a mutable global state. val runtime_warnings_enabled : unit -> bool Return whether runtime warnings are currently enabled. Since 4.03 Alert unsynchronized_access. The status of runtime warnings is a mutable global state. 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 module Immediate64 : sig end OCamldoc 2024-02-29 Stdlib.Sys(3)