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Module Sys: system interface
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<H2>17.28 Module <TT>Sys</TT>: system interface</H2><A NAME="s:Sys"></A>
<A NAME="@manual483"></A><PRE>
val argv: string array
</PRE>
<A NAME="@manual484"></A><BLOCKQUOTE>
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.
</BLOCKQUOTE>
<PRE>
val file_exists: string -> bool
</PRE>
<A NAME="@manual485"></A><BLOCKQUOTE>
Test if a file with the given name exists.
</BLOCKQUOTE>
<PRE>
val remove: string -> unit
</PRE>
<A NAME="@manual486"></A><BLOCKQUOTE>
Remove the given file name from the file system.
</BLOCKQUOTE>
<PRE>
val rename : string -> string -> unit
</PRE>
<A NAME="@manual487"></A><BLOCKQUOTE>
Rename a file. The first argument is the old name and the
second is the new name.
</BLOCKQUOTE>
<PRE>
val getenv: string -> string
</PRE>
<A NAME="@manual488"></A><BLOCKQUOTE>
Return the value associated to a variable in the process
environment. Raise <CODE>Not_found</CODE> if the variable is unbound.
</BLOCKQUOTE>
<PRE>
val command: string -> int
</PRE>
<A NAME="@manual489"></A><BLOCKQUOTE>
Execute the given shell command and return its exit code.
</BLOCKQUOTE>
<PRE>
val time: unit -> float
</PRE>
<A NAME="@manual490"></A><BLOCKQUOTE>
Return the processor time, in seconds, used by the program
since the beginning of execution.
</BLOCKQUOTE>
<PRE>
val chdir: string -> unit
</PRE>
<A NAME="@manual491"></A><BLOCKQUOTE>
Change the current working directory of the process.
</BLOCKQUOTE>
<PRE>
val getcwd: unit -> string
</PRE>
<A NAME="@manual492"></A><BLOCKQUOTE>
Return the current working directory of the process.
</BLOCKQUOTE>
<PRE>
val interactive: bool ref
</PRE>
<A NAME="@manual493"></A><BLOCKQUOTE>
This reference is initially set to <CODE>false</CODE> in standalone
programs and to <CODE>true</CODE> if the code is being executed under
the interactive toplevel system <CODE>ocaml</CODE>.
</BLOCKQUOTE>
<PRE>
val os_type: string
</PRE>
<A NAME="@manual494"></A><BLOCKQUOTE>
Operating system currently executing the Caml program.
One of <CODE>"Unix"</CODE>, <CODE>"Win32"</CODE>, or <CODE>"MacOS"</CODE>.
</BLOCKQUOTE>
<PRE>
val word_size: int
</PRE>
<A NAME="@manual495"></A><BLOCKQUOTE>
Size of one word on the machine currently executing the Caml
program, in bits: 32 or 64.
</BLOCKQUOTE>
<PRE>
val max_string_length: int
</PRE>
<A NAME="@manual496"></A><BLOCKQUOTE>
Maximum length of a string.
</BLOCKQUOTE>
<PRE>
val max_array_length: int
</PRE>
<A NAME="@manual497"></A><BLOCKQUOTE>
Maximum length of an array.
</BLOCKQUOTE>
<H3>Signal handling </H3>
<PRE>
type signal_behavior =
Signal_default
| Signal_ignore
| Signal_handle of (int -> unit)
</PRE>
<BLOCKQUOTE>
What to do when receiving a signal:<BR><CODE>Signal_default</CODE>: take the default behavior
(usually: abort the program)<BR><CODE>Signal_ignore</CODE>: ignore the signal<BR><CODE>Signal_handle f</CODE>: call function <CODE>f</CODE>, giving it the signal
number as argument.
</BLOCKQUOTE>
<PRE>
val signal: int -> signal_behavior -> signal_behavior
</PRE>
<A NAME="@manual498"></A><BLOCKQUOTE>
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.
</BLOCKQUOTE>
<PRE>
val set_signal: int -> signal_behavior -> unit
</PRE>
<A NAME="@manual499"></A><BLOCKQUOTE>
Same as <CODE>signal</CODE> but return value is ignored.
</BLOCKQUOTE>
<PRE>
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 *)
</PRE>
<A NAME="@manual500"></A><A NAME="@manual501"></A><A NAME="@manual502"></A><A NAME="@manual503"></A><A NAME="@manual504"></A><A NAME="@manual505"></A><A NAME="@manual506"></A><A NAME="@manual507"></A><A NAME="@manual508"></A><A NAME="@manual509"></A><A NAME="@manual510"></A><A NAME="@manual511"></A><A NAME="@manual512"></A><A NAME="@manual513"></A><A NAME="@manual514"></A><A NAME="@manual515"></A><A NAME="@manual516"></A><A NAME="@manual517"></A><A NAME="@manual518"></A><A NAME="@manual519"></A><A NAME="@manual520"></A><BLOCKQUOTE>
Signal numbers for the standard POSIX signals.
</BLOCKQUOTE>
<PRE>
exception Break
</PRE>
<A NAME="@manual521"></A><BLOCKQUOTE>
Exception raised on interactive interrupt if <CODE>catch_break</CODE>
is on.
</BLOCKQUOTE>
<PRE>
val catch_break: bool -> unit
</PRE>
<A NAME="@manual522"></A><BLOCKQUOTE>
<CODE>catch_break</CODE> governs whether interactive interrupt (ctrl-C)
terminates the program or raises the <CODE>Break</CODE> exception.
Call <CODE>catch_break true</CODE> to enable raising <CODE>Break</CODE>,
and <CODE>catch_break false</CODE> to let the system
terminate the program on user interrupt.
</BLOCKQUOTE>
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