Module "System.curry"

Library to access parts of the system environment.

Author: Michael Hanus, Bernd Brassel

Version: August 2007

Functions:
exitWith | getArgs | getCPUTime | getElapsedTime | getEnviron | getHostname | getPID | getProgName | setEnviron | sleep | system | unsetEnviron

getCPUTime  :: IO Int              Returns the current cpu time of the process in milliseconds.

getElapsedTime  :: IO Int              Returns the current elapsed time of the process in milliseconds.

getArgs  :: IO [String]              Returns the list of the program's command line arguments.

getEnviron  :: String -> IO String              Returns the value of an environment variable.

setEnviron  :: String -> String -> IO ()              Set an environment variable to a value.

unsetEnviron  :: String -> IO ()              Removes an environment variable that has been set by setEnviron.

getHostname  :: IO String              Returns the hostname of the machine running this process.

getPID  :: IO Int              Returns the process identifier of the current Curry process.

getProgName  :: IO String              Returns the name of the current program, i.e., the name of the main module currently executed.

system  :: String -> IO Int              Executes a shell command and return with the exit code of the command.

exitWith  :: Int -> IO a              Terminates the execution of the current Curry program and returns the exit code given by the argument.

sleep  :: Int -> IO ()              The evaluation of the action (sleep n) puts the Curry process asleep for n seconds.

Returns the current cpu time of the process in milliseconds.

Further infos:

• externally defined

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getElapsedTime :: IO Int   

Returns the current elapsed time of the process in milliseconds.

Further infos:

• externally defined

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getArgs :: IO [String]   

Returns the list of the program's command line arguments. The program name is not included.

Further infos:

• externally defined

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getEnviron :: String -> IO String   

Returns the value of an environment variable. The empty string is returned for undefined environment variables.

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setEnviron :: String -> String -> IO ()   

Set an environment variable to a value. The new value will be passed to subsequent shell commands (see system) and visible to subsequent calls to getEnviron (but it is not visible in the environment of the process that started the program execution).

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unsetEnviron :: String -> IO ()   

Removes an environment variable that has been set by setEnviron.

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getHostname :: IO String   

Returns the hostname of the machine running this process.

Further infos:

• externally defined

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getPID :: IO Int   

Returns the process identifier of the current Curry process.

Further infos:

• externally defined

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getProgName :: IO String   

Returns the name of the current program, i.e., the name of the main module currently executed.

Further infos:

• externally defined

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system :: String -> IO Int   

Executes a shell command and return with the exit code of the command. An exit status of zero means successful execution.

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exitWith :: Int -> IO a   

Terminates the execution of the current Curry program and returns the exit code given by the argument. An exit code of zero means successful execution.

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sleep :: Int -> IO ()   

The evaluation of the action (sleep n) puts the Curry process asleep for n seconds.

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