diff options
Diffstat (limited to 'pod/perldelta.pod')
| -rw-r--r-- | pod/perldelta.pod | 67 |
1 files changed, 45 insertions, 22 deletions
diff --git a/pod/perldelta.pod b/pod/perldelta.pod index 1447fd4959..4aa05edc82 100644 --- a/pod/perldelta.pod +++ b/pod/perldelta.pod @@ -35,6 +35,29 @@ variable as if its contents had appeared on a "#!perl" line at the beginning of your script, except that hyphens are optional. PERL5OPT may only be used to set the following switches: B<-[DIMUdmw]>. +=head2 Limitations on B<-M>, and C<-m>, and B<-T> options + +The C<-M> and C<-m> options are no longer allowed on the C<#!> line of +a script. If a script needs a module, it should invoke it with the +C<use> pragma. + +The B<-T> option is also forbidden on the C<#!> line of a script, +unless it was present on the Perl command line. Due to the way C<#!> +works, this usually means that B<-T> must be in the first argument. +Thus: + + #!/usr/bin/perl -T -w + +will probably work for an executable script invoked as C<scriptname>, +while: + + #!/usr/bin/perl -w -T + +will probably fail under the same conditions. (Non-Unix systems will +probably not follow this rule.) But C<perl scriptname> is guaranteed +to fail, since then there is no chance of B<-T> being found on the +command line before it is found on the C<#!> line. + =head2 More precise warnings If you removed the B<-w> option from your Perl 5.003 scripts because it @@ -84,18 +107,18 @@ After this code executes in Perl 5.004, $a{b} exists but $a[2] does not. In Perl 5.002 and 5.003, both $a{b} and $a[2] would have existed (but $a[2]'s value would have been undefined). -=head2 C<$)> is writable +=head2 Group vector changeable with C<$)> The C<$)> special variable has always (well, in Perl 5, at least) -reflected not only the current effective group, but also the group -list as returned by the C<getgroups()> C function (if there is one). -However, due to an oversight, assigning to C<$)> has not called -C<setgroups()>, only C<setegid()>. +reflected not only the current effective group, but also the group list +as returned by the C<getgroups()> C function (if there is one). +However, until this release, there has not been a way to call the +C<setgroups()> C function from Perl. -In Perl 5.004, assigning to C<$)> is exactly symmetrical with -examining it: The first number in its string value is used as the -effective gid, and all the others are passed to the C<setgroups()> C -function (if there is one). +In Perl 5.004, assigning to C<$)> is exactly symmetrical with examining +it: The first number in its string value is used as the effective gid; +if there are any numbers after the first one, they are passed to the +C<setgroups()> C function (if there is one). =head2 Fixed parsing of $$<digit>, &$<digit>, etc. @@ -127,9 +150,9 @@ calculation of a return value if it isn't going to be used. =head2 Changes to tainting checks A bug in previous versions may have failed to detect some insecure -conditions when taint checks are turned on. (Taint checks are used +conditions when taint checks are turned on. (Taint checks are used in setuid or setgid scripts, or when explicitly turned on with the -C<-T> invocation option.) Although it's unlikely, this may cause a +C<-T> invocation option.) Although it's unlikely, this may cause a previously-working script to now fail -- which should be construed as a blessing, since that indicates a potentially-serious security hole was just plugged. @@ -662,17 +685,17 @@ alphabetically: FindBin.pm Find path of currently executing program - Class/Template.pm Structure/member template builder - File/stat.pm Object-oriented wrapper around CORE::stat - Net/hostent.pm Object-oriented wrapper around CORE::gethost* - Net/netent.pm Object-oriented wrapper around CORE::getnet* - Net/protoent.pm Object-oriented wrapper around CORE::getproto* - Net/servent.pm Object-oriented wrapper around CORE::getserv* - Time/gmtime.pm Object-oriented wrapper around CORE::gmtime - Time/localtime.pm Object-oriented wrapper around CORE::localtime - Time/tm.pm Perl implementation of "struct tm" for {gm,local}time - User/grent.pm Object-oriented wrapper around CORE::getgr* - User/pwent.pm Object-oriented wrapper around CORE::getpw* + Class/Struct.pm Declare struct-like datatypes as Perl classes + File/stat.pm By-name interface to Perl's built-in stat + Net/hostent.pm By-name interface to Perl's built-in gethost* + Net/netent.pm By-name interface to Perl's built-in getnet* + Net/protoent.pm By-name interface to Perl's built-in getproto* + Net/servent.pm By-name interface to Perl's built-in getserv* + Time/gmtime.pm By-name interface to Perl's built-in gmtime + Time/localtime.pm By-name interface to Perl's built-in localtime + Time/tm.pm Internal object for Time::{gm,local}time + User/grent.pm By-name interface to Perl's built-in getgr* + User/pwent.pm By-name interface to Perl's built-in getpw* Tie/RefHash.pm Base class for tied hashes with references as keys |