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=encoding utf8 =head1 NAME POSIX::1003::User - POSIX handling user and groups =head1 SYNOPSIS use POSIX::1003::User; =head1 DESCRIPTION =head1 FUNCTIONS =head2 Standard POSIX User and group management is provided via many functions, which are not portable either in implementation or in availability. See also L<http://www.cs.berkeley.edu/~daw/papers/setuid-usenix02.pdf> =head3 Get/set users The implementation of L<setuid()|POSIX::1003::User/"Get/set users"> differs per platform. L<seteuid()|POSIX::1003::User/"Get/set users"> is more consistent and widely available. L<setresuid()|POSIX::1003::User/"Get/set users"> is the most powerful, but not everywhere. Functions which are not implemented will return error ENOSYS. B<. Example> my $uid = getuid(); defined $uid or die $!; setuid($uid) or die "cannot set uid to $uid: $!\n"; my ($ruid, $euid, $suid) = getresuid; defined $ruid or die $!; setresuid($ruid, $euid, $suid) or die $!; =over 4 =item B<geteuid>() =item B<getresuid>() =item B<getuid>() =item B<seteuid>($euid) =item B<setresuid>($ruid, $euid, $suid) example: # see also the set*uid examples above my @mygroups = getgroups(); @mygroups or die $!; setgroups(1,2,3) or die $!; =item B<setreuid>($ruid, $euid) =item B<setuid>($uid) =back =head3 Get/set groups The same use and limitations as the uid functions. =over 4 =item B<getegid>() =item B<getgid>() =item B<getgroups>() Returns a list of group-ids, which may (or may not) contain the effective group-id. =item B<getresgid>() =item B<setegid>($egid) =item B<setgid>($gid) =item B<setregid>($rgid, $egid) =item B<setresgid>($rgid, $egid, $sgid) =back =head3 Information about users =over 4 =item B<getlogin>() The username associated with the controling terminal. Simply L<perlfunc/getlogin> =item B<getpwent>() Simply L<perlfunc/getpwent> =item B<getpwnam>($username) Simply L<perlfunc/getpwnam> =item B<getpwuid>($userid) Simply L<perlfunc/getpwuid> example: my ($name, $passwd, $uid, $gid, $quota, $comment, $gcos, $dir, $shell, $expire) = getpwuid($uid); my $uid = getpwnam($username); my $name = getpwuid($userid); =back =head3 Information about groups =over 4 =item B<getgrent>() Simply L<perlfunc/getgrent> =item B<getgrgid>($groupid) Simply L<perlfunc/getgrgid> =item B<getgrnam>($groupname) Simply L<perlfunc/getgrnam> =back =head1 SEE ALSO This module is part of POSIX-1003 distribution version 1.02, built on November 10, 2020. Website: F<http://perl.overmeer.net/CPAN>. The code is based on L<POSIX>, which is released with Perl itself. See also L<POSIX::Util> for additional functionality. =head1 COPYRIGHTS Copyrights 2011-2020 on the perl code and the related documentation by [Mark Overmeer]. For other contributors see ChangeLog. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. See F<http://dev.perl.org/licenses/>
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