Fork: Difference between revisions

Line 877:

#handle DisplayBanner("Welcome!")</lang>

=={{header|~~Slate~~}}==

=={{header|Scala}}==

[[Category:Scala Implementations]]{{libheader|Scala}}

===A Linux version===

<lang scala>import java.io.IOException

object Fork extends App {

⚫

The following built-in method uses the cloneSystem primitive (which calls fork()) to fork code. The parent and the child both get a socket from a socketpair which they can use to communicate. The cloneSystem is currently unimplemented on windows (since there isn't a fork() system call).

val builder: ProcessBuilder = new ProcessBuilder()

val currentUser: String = builder.environment.get("USER")

val command: java.util.List[String] = java.util.Arrays.asList("ps", "-f", "-U", currentUser)

builder.command(command)

try {

val lines = scala.io.Source.fromInputStream(builder.start.getInputStream).getLines()

println(s"Output of running $command is:")

while (lines.hasNext) println(lines.next())

}

catch {

case iox: IOException => iox.printStackTrace()

}

}</lang>

===A Windows version===

<lang scala>import java.io.IOException

object Fork extends App {

<lang slate>p@(Process traits) forkAndDo: b

val command: java.util.List[String] = java.util.Arrays.asList("cmd.exe", "/C", "ECHO.| TIME")

val builder: ProcessBuilder = new ProcessBuilder(command)

try {

val lines = scala.io.Source.fromInputStream(builder.start.getInputStream).getLines()

println(s"Output of running $command is:")

while (lines.hasNext) println(lines.next())

}

catch {

case iox: IOException => iox.printStackTrace()

}

}</lang>

=={{header|Slate}}==

⚫

The following built-in method uses the cloneSystem primitive (which calls fork()) to fork code. The parent and the child both get a socket from a socketpair which they can use to communicate. The cloneSystem is currently unimplemented on windows (since there isn't a fork() system call).<lang slate>p@(Process traits) forkAndDo: b

[| ret |

(ret := lobby cloneSystem)