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Diffstat (limited to 'pod/perldiag.pod')
| -rw-r--r-- | pod/perldiag.pod | 252 |
1 files changed, 234 insertions, 18 deletions
diff --git a/pod/perldiag.pod b/pod/perldiag.pod index 43b0f3f5b8..8cc2945336 100644 --- a/pod/perldiag.pod +++ b/pod/perldiag.pod @@ -14,8 +14,11 @@ desperation): (P) An internal error you should never see (trappable). (X) A very fatal error (non-trappable). -Optional warnings are enabled by using the B<-w> switch. Trappable -errors may be trapped using the eval operator. See L<perlfunc/eval>. +Optional warnings are enabled by using the B<-w> switch. Warnings may +be captured by setting C<$^Q> to a reference to a routine that will be +called on each warning instead of printing it. See L<perlvar>. +Trappable errors may be trapped using the eval operator. See +L<perlfunc/eval>. Some of these messages are generic. Spots that vary are denoted with a %s, just as in a printf format. Note that some message start with a %s! @@ -128,6 +131,12 @@ the return value of your socket() call? See L<perlfunc/accept>. (F) msgsnd() requires a string at least as long as sizeof(long). +=item Ambiguous use of %s resolved as %s + +(W)(S) You said something that may not be interpreted the way +you thought. Normally it's pretty easy to disambiguate it by supplying +a missing quote, operator, paren pair or declaration. + =item Args must match #! line (F) The setuid emulator requires that the arguments Perl was invoked @@ -343,7 +352,8 @@ but then $foo no longer contains a glob. =item Can't create pipe mailbox -(F) An error peculiar to VMS. +(P) An error peculiar to VMS. The process is suffering from exhausted quotas +or other plumbing problems. =item Can't declare %s in my @@ -439,13 +449,32 @@ levels, the following is missing its final parenthesis: (F) A fatal error occurred while trying to fork while opening a pipeline. +=item Can't get filespec - stale stat buffer? + +(S) A warning peculiar to VMS. This arises because of the difference between +access checks under VMS and under the Unix model Perl assumes. Under VMS, +access checks are done by filename, rather than by bits in the stat buffer, so +that ACLs and other protections can be taken into account. Unfortunately, Perl +assumes that the stat buffer contains all the necessary information, and passes +it, instead of the filespec, to the access checking routine. It will try to +retrieve the filespec using the device name and FID present in the stat buffer, +but this works only if you haven't made a subsequent call to the CRTL stat() +routine, since the device name is overwritten with each call. If this warning +appears, the name lookup failed, and the access checking routine gave up and +returned FALSE, just to be conservative. (Note: The access checking routine +knows about the Perl C<stat> operator and file tests, so you shouldn't ever +see this warning in response to a Perl command; it arises only if some internal +code takes stat buffers lightly.) + =item Can't get pipe mailbox device name -(F) An error peculiar to VMS. +(P) An error peculiar to VMS. After creating a mailbox to act as a pipe, Perl +can't retrieve its name for later use. =item Can't get SYSGEN parameter value for MAXBUF -(F) An error peculiar to VMS. +(P) An error peculiar to VMS. Perl asked $GETSYI how big you want your +mailbox buffers to be, and didn't get an answer. =item Can't goto subroutine outside a subroutine @@ -454,6 +483,13 @@ call for another. It can't manufacture one out of whole cloth. In general you should only be calling it out of an AUTOLOAD routine anyway. See L<perlfunc/goto>. +=item Can't localize lexical variable %s + +(F) You used local on a variable name that was previous declared as a +lexical variable using "my". This is not allowed. If you want to +localize a package variable of the same name, qualify it with the +package name. + =item Can't locate %s in @INC (F) You said to do (or require, or use) a file that couldn't be found @@ -505,6 +541,28 @@ try any of several modules in the Perl library to do this, such as "open2.pl". Alternately, direct the pipe's output to a file using ">", and then read it in under a different file handle. +=item Can't open error file %s as stderr + +(F) An error peculiar to VMS. Perl does its own command line redirection, and +couldn't open the file specified after '2>' or '2>>' on the command line for +writing. + +=item Can't open input file %s as stdin + +(F) An error peculiar to VMS. Perl does its own command line redirection, and +couldn't open the file specified after '<' on the command line for reading. + +=item Can't open output file %s as stdout + +(F) An error peculiar to VMS. Perl does its own command line redirection, and +couldn't open the file specified after '>' or '>>' on the command line for +writing. + +=item Can't open output pipe (name: %s) + +(P) An error peculiar to VMS. Perl does its own command line redirection, and +couldn't open the pipe into which to send data destined for stdout. + =item Can't open perl script "%s": %s (F) The script you specified can't be opened for the indicated reason. @@ -514,6 +572,11 @@ and then read it in under a different file handle. (S) The rename done by the B<-i> switch failed for some reason, probably because you don't have write permission to the directory. +=item Can't reopen input pipe (name: %s) in binary mode + +(P) An error peculiar to VMS. Perl thought stdin was a pipe, and tried to +reopen it to accept binary data. Alas, it failed. + =item Can't reswap uid and euid (P) The setreuid() call failed for some reason in the setuid emulator @@ -568,14 +631,6 @@ message indicates that such a conversion was attempted. of upgradability. Upgrading to undef indicates an error in the code calling sv_upgrade. -=item Can't use %s as left arg of an implicit -> - -(F) The compiler tried to interpret a bracketed expression as a subscript -to an array reference. But to the left of the brackets was an expression -that didn't end in an arrow (->), or look like a subscripted expression. -Only subscripted expressions with multiple subscripts are allowed to omit -the intervening arrow. - =item Can't use %s for loop variable (F) Only a simple scalar variable may be used as a loop variable on a foreach. @@ -586,7 +641,15 @@ the intervening arrow. reference of the type needed. You can use the ref() function to test the type of the reference, if need be. -=item Can't use a string as %s ref while "strict refs" in use +=item Can't use \1 to mean $1 in expression + +(W) In an ordinary expression, backslash is a unary operator that creates +a reference to its argument. The use of backslash to indicate a backreference +to a matched substring is only valid as part of a regular expression pattern. +Trying to do this in ordinary Perl code produces a value that prints +out looking like SCALAR(0xdecaf). Use the $1 form instead. + +=item Can't use string ("%s") as %s ref while "strict refs" in use (F) Only hard references are allowed by "strict refs". Symbolic references are disallowed. See L<perlref>. @@ -609,6 +672,12 @@ the global variable) and it would be incredibly confusing to have variables in your program that looked like magical variables but weren't. +=item Can't use subscript on %s + +(F) The compiler tried to interpret a bracketed expression as a +subscript. But to the left of the brackets was an expression that +didn't look like an array reference, or anything else subscriptable. + =item Can't write to temp file for B<-e>: %s (F) The write routine failed for some reason while trying to process @@ -664,9 +733,22 @@ times than it has returned. This probably indicates an infinite recursion, unless you're writing strange benchmark programs, in which case it indicates something else. -=item Did you mean $ instead of %? +=item Did you mean $ or @ instead of %? -(W) You probably said %hash{$key} when you meant $hash{$key}. +(W) You probably said %hash{$key} when you meant $hash{$key} or @hash{@keys}. +On the other hand, maybe you just meant %hash and got carried away. + +=item Do you need to predeclare %s? + +(S) This is an educated guess made in conjunction with the message "%s +found where operator expected". It often means a subroutine or module +name is being referenced that hasn't been declared yet. This may be +because of ordering problems in your file, or because of a missing +"sub", "package", "require", or "use" statement. If you're +referencing something that isn't defined yet, you don't actually have +to define the subroutine or package before the current location. You +can use an empty "sub foo;" or "package FOO;" to enter a "forward" +declaration. =item Don't know how to handle magic of type '%s' @@ -686,6 +768,14 @@ been freed. (F) An untrapped exception was raised while executing an END subroutine. The interpreter is immediately exited. +=item Error converting file specification %s + +(F) An error peculiar to VMS. Since Perl may have to deal with file +specifications in either VMS or Unix syntax, it converts them to a +single form when it must operate on them directly. Either you've +passed an invalid file specification to Perl, or you've found a +case the conversion routines don't handle. Drat. + =item Execution of %s aborted due to compilation errors. (F) The final summary message when a Perl compilation fails. @@ -705,9 +795,12 @@ a goto, or a loop control statement. (W) You are exiting a substitution by unconventional means, such as a a return, a goto, or a loop control statement. -=item Fatal $PUTMSG error: %d +=item Fatal VMS error at %s, line %d -(F) An error peculiar to VMS. +(P) An error peculiar to VMS. Something untoward happened in a VMS system +service or RTL routine; Perl's exit status should provide more details. The +filename in "at %s" and the line number in "line %d" tell you which section of +the Perl source code is distressed. =item fcntl is not implemented @@ -789,6 +882,12 @@ on the Internet. (W) You tried to get a socket or peer socket name on a closed socket. Did you forget to check the return value of your socket() call? +=item getpwnam returned invalid UIC %#o for user "%s" + +(S) A warning peculiar to VMS. The call to C<sys$getuai> underlying the +C<getpwnam> operator returned an invalid UIC. + + =item Glob not terminated (F) The lexer saw a left angle bracket in a place where it was expecting @@ -838,6 +937,11 @@ don't take to this kindly. (F) You used an 8 or 9 in a octal number. +=item Illegal octal digit ignored + +(W) You may have tried to use an 8 or 9 in a octal number. Interpretation +of the octal number stopped before the 8 or 9. + =item Insecure dependency in %s (F) You tried to do something that the tainting mechanism didn't like. @@ -861,6 +965,16 @@ setgid script if $ENV{PATH} is derived from data supplied (or potentially supplied) by the user. The script must set the path to a known value, using trustworthy data. See L<perlsec>. +=item Internal inconsistency in tracking vforks + +(S) A warning peculiar to VMS. Perl keeps track of the number +of times you've called C<fork> and C<exec>, in order to determine +whether the current call to C<exec> should be affect the current +script or a subprocess (see L<perlvms/exec>). Somehow, this count +has become scrambled, so Perl is making a guess and treating +this C<exec> as a request to terminate the Perl script +and execute the specified command. + =item internal disaster in regexp (P) Something went badly wrong in the regular expression parser. @@ -942,6 +1056,11 @@ one line to the next. (F) While certain functions allow you to specify a filehandle or an "indirect object" before the argument list, this ain't one of them. +=item Missing operator before %s? + +(S) This is an educated guess made in conjunction with the message "%s +found where operator expected". Often the missing operator is a comma. + =item Missing right bracket (F) The lexer counted more opening curly brackets (braces) than closing ones. @@ -1024,6 +1143,12 @@ See L<perlsec>. allowed to have a comma between that and the following arguments. Otherwise it'd be just another one of the arguments. +=item No command into which to pipe on command line + +(F) An error peculiar to VMS. Perl handles its own command line redirection, +and found a '|' at the end of the command line, so it doesn't know whither you +want to pipe the output from this command. + =item No DB::DB routine defined (F) The currently executing code was compiled with the B<-d> switch, @@ -1045,6 +1170,30 @@ but for some reason the perl5db.pl file (or some facsimile thereof) didn't define a DB::sub routine to be called at the beginning of each ordinary subroutine call. +=item No error file after 2> or 2>> on command line + +(F) An error peculiar to VMS. Perl handles its own command line redirection, +and found a '2>' or a '2>>' on the command line, but can't find the name of the +file to which to write data destined for stderr. + +=item No input file after < on command line + +(F) An error peculiar to VMS. Perl handles its own command line redirection, +and found a '<' on the command line, but can't find the name of the file from +which to read data for stdin. + +=item No output file after > on command line + +(F) An error peculiar to VMS. Perl handles its own command line redirection, +and found a lone '>' at the end of the command line, so it doesn't know whither +you wanted to redirect stdout. + +=item No output file after > or >> on command line + +(F) An error peculiar to VMS. Perl handles its own command line redirection, +and found a '>' or a '>>' on the command line, but can't find the name of the +file to which to write data destined for stdout. + =item No Perl script found in input (F) You called C<perl -x>, but no line was found in the file beginning @@ -1065,6 +1214,12 @@ your system. (F) The argument to B<-I> must follow the B<-I> immediately with no intervening space. +=item No such pipe open + +(P) An error peculiar to VMS. The internal routine my_pclose() tried to +close a pipe which hadn't been opened. This should have been caught earlier as +an attempt to close an unopened filehandle. + =item No such signal: SIG%s (W) You specified a signal name as a subscript to %SIG that was not recognized. @@ -1173,6 +1328,14 @@ since hash lists come in key/value pairs. (F) An attempt was made to use an entry in an overloading table that somehow no longer points to a valid method. See L<perlovl>. +=item Operator or semicolon missing before %s + +(S) You used a variable or subroutine call where the parser was +expecting an operator. The parser has assumed you really meant +to use an operator, but this is highly likely to be incorrect. +For example, if you say "*foo *foo" it will be interpreted as +if you said "*foo * 'foo'". + =item Out of memory for yacc stack (F) The yacc parser wanted to grow its stack so it could continue parsing, @@ -1350,6 +1513,12 @@ anyway? See L<perlfunc/require>. (F) The setuid emulator in suidperl decided you were up to no good. +=item pid %d not a child + +(W) A warning peculiar to VMS. Waitpid() was asked to wait for a process which +isn't a subprocess of the current process. While this is fine from VMS' +perspective, it's probably not what you intended. + =item POSIX getpgrp can't take an argument (F) Your C compiler uses POSIX getpgrp(), which takes no argument, unlike @@ -1458,6 +1627,11 @@ assigning to it and when evaluating its argument, while @foo[&bar] behaves like a list when you assign to it, and provides a list context to its subscript, which can do weird things if you're only expecting one subscript. +On the other hand, if you were actually hoping to treat the array +element as a list, you need to look into how references work, since +Perl will not magically convert between scalars and lists for you. See +L<perlref>. + =item Script is not setuid/setgid in suidperl (F) Oddly, the suidperl program was invoked on a script with its setuid @@ -1884,6 +2058,11 @@ you and for any luckless subroutine that you happen to call. You should use the new C<//m> and C<//s> modifiers now to do that without the dangerous action-at-a-distance effects of C<$*>. +=item Use of %s in printf format not supported + +(F) You attempted to use a feature of printf that is accessible only +from C. This usually means there's a better way to do it in Perl. + =item Use of %s is deprecated (D) The construct indicated is no longer recommended for use, generally @@ -1917,6 +2096,22 @@ when you meant to say ($one, $two) = (1, 2); +Another common error is to use ordinary parentheses to construct a list +reference when you should be using square or curly brackets, for +example, if you say + + $array = (1,2); + +when you should have said + + $array = [1,2]; + +The square brackets explicitly turn a list value into a scalar value, +while parentheses do not. So when a parenthesized list is evaluated in +a scalar context, the comma is treated like C's comma operator, which +throws away the left argument, which is not what you want. See +L<perlref> for more on this. + =item Warning: unable to close filehandle %s properly. (S) The implicit close() done by an open() got an error indication on the @@ -1998,5 +2193,26 @@ substitution, but stylistically it's better to use the variable form because other Perl programmers will expect it, and it works better if there are more than 9 backreferences. +=item '|' and '<' may not both be specified on command line + +(F) An error peculiar to VMS. Perl does its own command line redirection, and +found that STDIN was a pipe, and that you also tried to redirect STDIN using +'<'. Only one STDIN stream to a customer, please. + +=item '|' and '>' may not both be specified on command line + +(F) An error peculiar to VMS. Perl does its own command line redirection, and +thinks you tried to redirect stdout both to a file and into a pipe to another +command. You need to choose one or the other, though nothing's stopping you +from piping into a program or Perl script which 'splits' output into two +streams, such as + + open(OUT,">$ARGV[0]") or die "Can't write to $ARGV[0]: $!"; + while (<STDIN>) { + print; + print OUT; + } + close OUT; + =back |