Sys::Utmp::Utent 1.6 review

Sys::Utmp::Utent is a Perl module to represent a single utmp entry. SYNOPSIS use Sys::Utmp; my $utmp = Sys::Utmp->new();

License: Perl Artistic License File size: 8K Developer: Jonathan Stowe

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Sys::Utmp::Utent is a Perl module to represent a single utmp entry.

SYNOPSIS

use Sys::Utmp;

my $utmp = Sys::Utmp->new();

while ( my $utent = $utmp->getutent() )
{
if ( $utent->user_process )
{
print $utent->ut_user,"n";
}
}

$utmp->endutent;

As described in the Sys::Utmp documentation the getutent method returns an object of the type Sys::Utmp::Utent which provides methods for accessing the fields in the utmp record. There are also methods for determining the type of the record.

The access methods relate to the common names for the members of the C struct utent - those provided are the superset from the Gnu implementation and may not be available on all systems: where they are not they will return the empty string.

ut_user

Returns the use this record was created for if this is a record for a user process. Some systems may return other information depending on the record type. If no user was set this will be the empty string. If tainting is switched on with the '-T' switch to perl then this will be 'tainted' as it is possible that the user name came from an untrusted source.

ut_id

The identifier for this record - it might be the inittab tag or some other system dependent value.

ut_line

For user process records this will be the name of the terminalor line that the user is connected on.

ut_pid

The process ID of the process that created this record.

ut_type

The type of the record this will have a value corresponding to one of the constants (not all of these may be available on all systems and there may well be others which should be described in the getutent manpage or in /usr/include/utmp.h ) :

ACCOUNTING - record was created for system accounting purposes.
BOOT_TIME - the record was created at boot time.
DEAD_PROCESS - The process that created this record has terminated.
EMPTY - record probably contains no other useful information.
INIT_PROCESS - this is a record for process created by init.
LOGIN_PROCESS - this record was created for a login process (e.g. getty).
NEW_TIME - record created when the system time has been set.
OLD_TIME - record recording the old tme when the system time has been set.
RUN_LVL - records the time at which the current run level was started.
USER_PROCESS - record created for a user process (e.g. a login )
for convenience Sys::Utmp::Utent provides methods which are lower case versions of the constant names which return true if the record is of that type.

ut_host

On systems which support this the method will return the hostname of the host for which the process that created the record was started - for example for a telnet login. If taint checking has been turned on (with the -T switch to perl ) then this value will be tainted as it is possible that a remote user will be in control of the DNS for the machine they have logged in from. ( see perlsec for more on tainting )

ut_time

The time in epoch seconds wt which the record was created.

Requirements:
Perl