perldiag.1

视频监控网络部分的协议ddns,的模块的实现代码,请大家大胆指正.

.IP "Can't do seteuid!" 4
.IX Item "Can't do seteuid!"
(P) The setuid emulator of suidperl failed for some reason.
.IP "Can't do setuid" 4
.IX Item "Can't do setuid"
(F) This typically means that ordinary perl tried to exec suidperl to do
setuid emulation, but couldn't exec it.  It looks for a name of the form
sperl5.000 in the same directory that the perl executable resides under
the name perl5.000, typically /usr/local/bin on Unix machines.  If the
file is there, check the execute permissions.  If it isn't, ask your
sysadmin why he and/or she removed it.
.IP "Can't do waitpid with flags" 4
.IX Item "Can't do waitpid with flags"
(F) This machine doesn't have either \fIwaitpid()\fR or \fIwait4()\fR, so only
\&\fIwaitpid()\fR without flags is emulated.
.IP "Can't emulate \-%s on #! line" 4
.IX Item "Can't emulate -%s on #! line"
(F) The #! line specifies a switch that doesn't make sense at this
point.  For example, it'd be kind of silly to put a \fB\-x\fR on the #!
line.
.ie n .IP "Can't %s\fR \f(CW%s\fR\-endian \f(CW%ss on this platform" 4
.el .IP "Can't \f(CW%s\fR \f(CW%s\fR\-endian \f(CW%ss\fR on this platform" 4
.IX Item "Can't %s %s-endian %ss on this platform"
(F) Your platform's byte-order is neither big-endian nor little-endian,
or it has a very strange pointer size.  Packing and unpacking big\- or
little-endian floating point values and pointers may not be possible.
See \*(L"pack\*(R" in perlfunc.
.ie n .IP "Can't exec ""%s"": %s" 4
.el .IP "Can't exec ``%s'': \f(CW%s\fR" 4
.IX Item "Can't exec %s: %s"
(W exec) A \fIsystem()\fR, \fIexec()\fR, or piped open call could not execute the
named program for the indicated reason.  Typical reasons include: the
permissions were wrong on the file, the file wasn't found in
\&\f(CW$ENV{PATH}\fR, the executable in question was compiled for another
architecture, or the #! line in a script points to an interpreter that
can't be run for similar reasons.  (Or maybe your system doesn't support
#! at all.)
.ie n .IP "Can't exec %s" 4
.el .IP "Can't exec \f(CW%s\fR" 4
.IX Item "Can't exec %s"
(F) Perl was trying to execute the indicated program for you because
that's what the #! line said.  If that's not what you wanted, you may
need to mention \*(L"perl\*(R" on the #! line somewhere.
.ie n .IP "Can't execute %s" 4
.el .IP "Can't execute \f(CW%s\fR" 4
.IX Item "Can't execute %s"
(F) You used the \fB\-S\fR switch, but the copies of the script to execute
found in the \s-1PATH\s0 did not have correct permissions.
.ie n .IP "Can't find an opnumber for ""%s""" 4
.el .IP "Can't find an opnumber for ``%s''" 4
.IX Item "Can't find an opnumber for %s"
(F) A string of a form \f(CW\*(C`CORE::word\*(C'\fR was given to \fIprototype()\fR, but there
is no builtin with the name \f(CW\*(C`word\*(C'\fR.
.ie n .IP "Can't find %s character property ""%s""" 4
.el .IP "Can't find \f(CW%s\fR character property ``%s''" 4
.IX Item "Can't find %s character property %s"
(F) You used \f(CW\*(C`\ep{}\*(C'\fR or \f(CW\*(C`\eP{}\*(C'\fR but the character property by that name
could not be found. Maybe you misspelled the name of the property
(remember that the names of character properties consist only of
alphanumeric characters), or maybe you forgot the \f(CW\*(C`Is\*(C'\fR or \f(CW\*(C`In\*(C'\fR prefix?
.ie n .IP "Can't find label %s" 4
.el .IP "Can't find label \f(CW%s\fR" 4
.IX Item "Can't find label %s"
(F) You said to goto a label that isn't mentioned anywhere that it's
possible for us to go to.  See \*(L"goto\*(R" in perlfunc.
.ie n .IP "Can't find %s on \s-1PATH\s0" 4
.el .IP "Can't find \f(CW%s\fR on \s-1PATH\s0" 4
.IX Item "Can't find %s on PATH"
(F) You used the \fB\-S\fR switch, but the script to execute could not be
found in the \s-1PATH\s0.
.ie n .IP "Can't find %s on \s-1PATH\s0, '.' not in \s-1PATH\s0" 4
.el .IP "Can't find \f(CW%s\fR on \s-1PATH\s0, '.' not in \s-1PATH\s0" 4
.IX Item "Can't find %s on PATH, '.' not in PATH"
(F) You used the \fB\-S\fR switch, but the script to execute could not be
found in the \s-1PATH\s0, or at least not with the correct permissions.  The
script exists in the current directory, but \s-1PATH\s0 prohibits running it.
.ie n .IP "Can't find string terminator %s anywhere before \s-1EOF\s0" 4
.el .IP "Can't find string terminator \f(CW%s\fR anywhere before \s-1EOF\s0" 4
.IX Item "Can't find string terminator %s anywhere before EOF"
(F) Perl strings can stretch over multiple lines.  This message means
that the closing delimiter was omitted.  Because bracketed quotes count
nesting levels, the following is missing its final parenthesis:
.Sp
.Vb 1
\&    print q(The character \*(Aq(\*(Aq starts a side comment.);
.Ve
.Sp
If you're getting this error from a here-document, you may have included
unseen whitespace before or after your closing tag. A good programmer's
editor will have a way to help you find these characters.
.ie n .IP "Can't find Unicode property definition ""%s""" 4
.el .IP "Can't find Unicode property definition ``%s''" 4
.IX Item "Can't find Unicode property definition %s"
(F) You may have tried to use \f(CW\*(C`\ep\*(C'\fR which means a Unicode property (for
example \f(CW\*(C`\ep{Lu}\*(C'\fR is all uppercase letters).  If you did mean to use a
Unicode property, see perlunicode for the list of known properties.
If you didn't mean to use a Unicode property, escape the \f(CW\*(C`\ep\*(C'\fR, either
by \f(CW\*(C`\e\ep\*(C'\fR (just the \f(CW\*(C`\ep\*(C'\fR) or by \f(CW\*(C`\eQ\ep\*(C'\fR (the rest of the string, until
possible \f(CW\*(C`\eE\*(C'\fR).
.IP "Can't fork" 4
.IX Item "Can't fork"
(F) A fatal error occurred while trying to fork while opening a
pipeline.
.IP "Can't get filespec \- stale stat buffer?" 4
.IX Item "Can't get filespec - stale stat buffer?"
(S) A warning peculiar to \s-1VMS\s0.  This arises because of the difference
between access checks under \s-1VMS\s0 and under the Unix model Perl assumes.
Under \s-1VMS\s0, 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 \s-1FID\s0 present in the stat buffer, but this works only
if you haven't made a subsequent call to the \s-1CRTL\s0 \fIstat()\fR routine,
because 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 \s-1FALSE\s0, just to be conservative.  (Note: The access checking
routine knows about the Perl \f(CW\*(C`stat\*(C'\fR 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.)
.IP "Can't get pipe mailbox device name" 4
.IX Item "Can't get pipe mailbox device name"
(P) An error peculiar to \s-1VMS\s0.  After creating a mailbox to act as a
pipe, Perl can't retrieve its name for later use.
.IP "Can't get \s-1SYSGEN\s0 parameter value for \s-1MAXBUF\s0" 4
.IX Item "Can't get SYSGEN parameter value for MAXBUF"
(P) An error peculiar to \s-1VMS\s0.  Perl asked \f(CW$GETSYI\fR how big you want your
mailbox buffers to be, and didn't get an answer.
.ie n .IP "Can't ""goto"" into the middle of a foreach loop" 4
.el .IP "Can't ``goto'' into the middle of a foreach loop" 4
.IX Item "Can't goto into the middle of a foreach loop"
(F) A \*(L"goto\*(R" statement was executed to jump into the middle of a foreach
loop.  You can't get there from here.  See \*(L"goto\*(R" in perlfunc.
.ie n .IP "Can't ""goto"" out of a pseudo block" 4
.el .IP "Can't ``goto'' out of a pseudo block" 4
.IX Item "Can't goto out of a pseudo block"
(F) A \*(L"goto\*(R" statement was executed to jump out of what might look like
a block, except that it isn't a proper block.  This usually occurs if
you tried to jump out of a \fIsort()\fR block or subroutine, which is a no-no.
See \*(L"goto\*(R" in perlfunc.
.IP "Can't goto subroutine from a sort sub (or similar callback)" 4
.IX Item "Can't goto subroutine from a sort sub (or similar callback)"
(F) The \*(L"goto subroutine\*(R" call can't be used to jump out of the
comparison sub for a \fIsort()\fR, or from a similar callback (such
as the \fIreduce()\fR function in List::Util).
.IP "Can't goto subroutine from an eval\-%s" 4
.IX Item "Can't goto subroutine from an eval-%s"
(F) The \*(L"goto subroutine\*(R" call can't be used to jump out of an eval
\&\*(L"string\*(R" or block.
.IP "Can't goto subroutine outside a subroutine" 4
.IX Item "Can't goto subroutine outside a subroutine"
(F) The deeply magical \*(L"goto subroutine\*(R" call can only replace one
subroutine call for another.  It can't manufacture one out of whole
cloth.  In general you should be calling it out of only an \s-1AUTOLOAD\s0
routine anyway.  See \*(L"goto\*(R" in perlfunc.
.IP "Can't ignore signal \s-1CHLD\s0, forcing to default" 4
.IX Item "Can't ignore signal CHLD, forcing to default"
(W signal) Perl has detected that it is being run with the \s-1SIGCHLD\s0
signal (sometimes known as \s-1SIGCLD\s0) disabled.  Since disabling this
signal will interfere with proper determination of exit status of child
processes, Perl has reset the signal to its default value.  This
situation typically indicates that the parent program under which Perl
may be running (e.g. cron) is being very careless.
.ie n .IP "Can't ""last"" outside a loop block" 4
.el .IP "Can't ``last'' outside a loop block" 4
.IX Item "Can't last outside a loop block"
(F) A \*(L"last\*(R" statement was executed to break out of the current block,
except that there's this itty bitty problem called there isn't a current
block.  Note that an \*(L"if\*(R" or \*(L"else\*(R" block doesn't count as a \*(L"loopish\*(R"
block, as doesn't a block given to \fIsort()\fR, \fImap()\fR or \fIgrep()\fR.  You can
usually double the curlies to get the same effect though, because the
inner curlies will be considered a block that loops once.  See
\&\*(L"last\*(R" in perlfunc.
.IP "Can't linearize anonymous symbol table" 4
.IX Item "Can't linearize anonymous symbol table"
(F) Perl tried to calculate the method resolution order (\s-1MRO\s0) of a
package, but failed because the package stash has no name.
.ie n .IP "Can't load '%s' for module %s" 4
.el .IP "Can't load '%s' for module \f(CW%s\fR" 4
.IX Item "Can't load '%s' for module %s"
(F) The module you tried to load failed to load a dynamic extension. This
may either mean that you upgraded your version of perl to one that is
incompatible with your old dynamic extensions (which is known to happen
between major versions of perl), or (more likely) that your dynamic
extension was built against an older version of the library that is
installed on your system. You may need to rebuild your old dynamic
extensions.
.ie n .IP "Can't localize lexical variable %s" 4
.el .IP "Can't localize lexical variable \f(CW%s\fR" 4
.IX Item "Can't localize lexical variable %s"
(F) You used local on a variable name that was previously declared as a
lexical variable using \*(L"my\*(R" or \*(L"state\*(R".  This is not allowed.  If you want to
localize a package variable of the same name, qualify it with the
package name.
.IP "Can't localize through a reference" 4
.IX Item "Can't localize through a reference"
(F) You said something like \f(CW\*(C`local $$ref\*(C'\fR, which Perl can't currently
handle, because when it goes to restore the old value of whatever \f(CW$ref\fR
pointed to after the scope of the \fIlocal()\fR is finished, it can't be sure
that \f(CW$ref\fR will still be a reference.
.ie n .IP "Can't locate %s" 4
.el .IP "Can't locate \f(CW%s\fR" 4
.IX Item "Can't locate %s"
(F) You said to \f(CW\*(C`do\*(C'\fR (or \f(CW\*(C`require\*(C'\fR, or \f(CW\*(C`use\*(C'\fR) a file that couldn't be
found. Perl looks for the file in all the locations mentioned in \f(CW@INC\fR,
unless the file name included the full path to the file.  Perhaps you
need to set the \s-1PERL5LIB\s0 or \s-1PERL5OPT\s0 environment variable to say where
the extra library is, or maybe the script needs to add the library name
to \f(CW@INC\fR.  Or maybe you just misspelled the name of the file.  See
\&\*(L"require\*(R" in perlfunc and lib.
.ie n .IP "Can't locate auto/%s.al in @INC" 4
.el .IP "Can't locate auto/%s.al in \f(CW@INC\fR" 4
.IX Item "Can't locate auto/%s.al in @INC"
(F) A function (or method) was called in a package which allows
autoload, but there is no function to autoload.  Most probable causes
are a misprint in a function/method name or a failure to \f(CW\*(C`AutoSplit\*(C'\fR
the file, say, by doing \f(CW\*(C`make install\*(C'\fR.
.ie n .IP "Can't locate loadable object for module %s\fR in \f(CW@INC" 4
.el .IP "Can't locate loadable object for module \f(CW%s\fR in \f(CW@INC\fR" 4
.IX Item "Can't locate loadable object for module %s in @INC"
(F) The module you loaded is trying to load an external library, like
for example, \f(CW\*(C`foo.so\*(C'\fR or \f(CW\*(C`bar.dll\*(C'\fR, but the DynaLoader module was
unable to locate this library.  See DynaLoader.
.ie n .IP "Can't locate object method ""%s"" via package ""%s""" 4
.el .IP "Can't locate object method ``%s'' via package ``%s''" 4
.IX Item "Can't locate object method %s via package %s"
(F) You called a method correctly, and it correctly indicated a package
functioning as a class, but that package doesn't define that particular
method, nor does any of its base classes.  See perlobj.
.ie n .IP "Can't locate package %s for @%s::ISA" 4
.el .IP "Can't locate package \f(CW%s\fR for @%s::ISA" 4
.IX Item "Can't locate package %s for @%s::ISA"
(W syntax) The \f(CW@ISA\fR array contained the name of another package that
doesn't seem to exist.
.ie n .IP "Can't locate package %s\fR for the parents of \f(CW%s" 4
.el .IP "Can't locate package \f(CW%s\fR for the parents of \f(CW%s\fR" 4
.IX Item "Can't locate package %s for the parents of %s"
(W syntax) You did not define (or require/use) the first package,
which is named as a (possibly indirect) parent of the second by
\&\f(CW@ISA\fR inheritance.  Perl will treat this as if the undefined
package had an empty \f(CW@ISA\fR.
.IP "Can't locate PerlIO%s" 4
.IX Item "Can't locate PerlIO%s"
(F) You tried to use in \fIopen()\fR a PerlIO layer that does not exist,
e.g. open(\s-1FH\s0, \*(L">:nosuchlayer\*(R", \*(L"somefile\*(R").
.IP "Can't make list assignment to \e%ENV on this system" 4
.IX Item "Can't make list assignment to %ENV on this system"
(F) List assignment to \f(CW%ENV\fR is not supported on some systems, notably
\&\s-1VMS\s0.
.ie n .IP "Can't modify %s\fR in \f(CW%s" 4
.el .IP "Can't modify \f(CW%s\fR in \f(CW%s\fR" 4
.IX Item "Can't modify %s in %s"
(F) You aren't allowed to assign to the item indicated, or otherwise try
to change it, such as with an auto-increment.
.IP "Can't modify nonexistent substring" 4
.IX Item "Can't modify nonexistent substring"
(P) The internal routine that does assignment to a \fIsubstr()\fR was handed
a \s-1NULL\s0.
.IP "Can't modify non-lvalue subroutine call" 4
.IX Item "Can't modify non-lvalue subroutine call"