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| author | Steve Peters <steve@fisharerojo.org> | 2004-11-21 04:38:09 +0000 |
|---|---|---|
| committer | Rafael Garcia-Suarez <rgarciasuarez@gmail.com> | 2004-11-24 14:47:31 +0000 |
| commit | a537debe17982e491ffa12d12441cf74a452acb2 (patch) | |
| tree | 88b5f22feab2daef6d79e15617f0b8e89c53fae3 /pod/perlvar.pod | |
| parent | 9829f96ec1845f7d042cbefc5feb25009405e3e6 (diff) | |
| download | perl-a537debe17982e491ffa12d12441cf74a452acb2.tar.gz | |
[perl #3242] [PATCH]No error on assignment to $>
From: "Steve Peters via RT" <perlbug-followup@perl.org>
Message-ID: <rt-3.0.11-3242-100676.6.32723019025057@perl.org>
p4raw-id: //depot/perl@23532
Diffstat (limited to 'pod/perlvar.pod')
| -rw-r--r-- | pod/perlvar.pod | 12 |
1 files changed, 9 insertions, 3 deletions
diff --git a/pod/perlvar.pod b/pod/perlvar.pod index 8fc74417d7..292f444dfe 100644 --- a/pod/perlvar.pod +++ b/pod/perlvar.pod @@ -765,7 +765,9 @@ you may use the CPAN module C<Linux::Pid>. The real uid of this process. (Mnemonic: it's the uid you came I<from>, if you're running setuid.) You can change both the real uid and -the effective uid at the same time by using POSIX::setuid(). +the effective uid at the same time by using POSIX::setuid(). Since +changes to $< require a system call, check $! after a change attempt to +detect any possible errors. =item $EFFECTIVE_USER_ID @@ -779,7 +781,8 @@ The effective uid of this process. Example: ($<,$>) = ($>,$<); # swap real and effective uid You can change both the effective uid and the real uid at the same -time by using POSIX::setuid(). +time by using POSIX::setuid(). Changes to $> require a check to $! +to detect any possible errors after an attempted change. (Mnemonic: it's the uid you went I<to>, if you're running setuid.) C<< $< >> and C<< $> >> can be swapped only on machines @@ -802,7 +805,8 @@ set the real gid. So the value given by C<$(> should I<not> be assigned back to C<$(> without being forced numeric, such as by adding zero. You can change both the real gid and the effective gid at the same -time by using POSIX::setgid(). +time by using POSIX::setgid(). Changes to $( require a check to $! +to detect any possible errors after an attempted change. (Mnemonic: parentheses are used to I<group> things. The real gid is the group you I<left>, if you're running setgid.) @@ -828,6 +832,8 @@ list, say C< $) = "5 5" >. You can change both the effective gid and the real gid at the same time by using POSIX::setgid() (use only a single numeric argument). +Changes to $) require a check to $! to detect any possible errors +after an attempted change. (Mnemonic: parentheses are used to I<group> things. The effective gid is the group that's I<right> for you, if you're running setgid.) |