Reference

Proc::ProcessTable(3pm)

Perl extension to access the unix process table

NAME

Proc::ProcessTable - Perl extension to access the unix process table

SYNOPSIS

  use Proc::ProcessTable;
  my $p = Proc::ProcessTable->new( 'cache_ttys' => 1 ); 
  my @fields = $p->fields;
  my $ref = $p->table;

DESCRIPTION

Perl interface to the unix process table.

METHODS

new

Creates a new ProcessTable object. The constructor can take the following flags:

enable_ttys -- causes the constructor to use the tty determination code, which is the default behavior. Setting this to 0 disables this code, thus preventing the module from traversing the device tree, which on some systems, can be quite large and/or contain invalid device paths (for example, Solaris does not clean up invalid device entries when disks are swapped). If this is specified with cache_ttys, a warning is generated and the cache_ttys is overridden to be false.

cache_ttys -- causes the constructor to look for and use a file that caches a mapping of tty names to device numbers, and to create the file if it doesn't exist. This feature requires the Storable module. By default, the cache file name consists of a prefix /tmp/TTYDEVS_ and a byte order tag. The file name can be accessed (and changed) via $Proc::ProcessTable::TTYDEVSFILE.

fields

Returns a list of the field names supported by the module on the current architecture.

table

Reads the process table and returns a reference to an array of Proc::ProcessTable::Process objects. Attributes of a process object are returned by accessors named for the attribute; for example, to get the uid of a process just do:

$process->uid

The priority and pgrp methods also allow values to be set, since these are supported directly by internal perl functions.

EXAMPLES

 # A cheap and sleazy version of ps
 use Proc::ProcessTable;
 my $FORMAT = "%-6s %-10s %-8s %-24s %s\n";
 my $t = Proc::ProcessTable->new;
 printf($FORMAT, "PID", "TTY", "STAT", "START", "COMMAND"); 
 foreach my $p ( @{$t->table} ){
   printf($FORMAT, 
          $p->pid, 
          $p->ttydev, 
          $p->state, 
          scalar(localtime($p->start)), 
          $p->cmndline);
 }
 # Dump all the information in the current process table
 use Proc::ProcessTable;
 my $t = Proc::ProcessTable->new;
 foreach my $p (@{$t->table}) {
  print "--------------------------------\n";
  foreach my $f ($t->fields){
    print $f, ":  ", $p->{$f}, "\n";
  }
 }

CAVEATS

Please see the file README in the distribution for a list of supported operating systems. Please see the file PORTING for information on how to help make this work on your OS.

AUTHOR

J. Bargsten, D. Urist

SEE ALSO

Proc::ProcessTable::Process, perl(1).

History