waitpid waits for a particular child process to complete, returning 1 if the process is found and -1 on an error. : waitpid « System Functions « Perl

1. Perl
2. System Functions
3. waitpid

waitpid waits for a particular child process to complete, returning 1 if the process is found and -1 on an error.

      

#!/usr/bin/perl -w
$pid = fork();  

if ($pid == 0) {  
   print "In child.\n";  
   exit(0);  # Terminate child.
} elsif (! defined $pid) {  
   # Not defined: means an error.
} else {  
   # Parent process.

   sleep(5);  # Wait

   $status = waitpid($pid, 0);

   print "Child is dead with PID $status.\n";
}

   
    
    
    
    
    
  

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