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.

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.\" ========================================================================
.\"
.IX Title "PERLDIAG 1"
.TH PERLDIAG 1 "2007-12-18" "perl v5.10.0" "Perl Programmers Reference Guide"
.\" For nroff, turn off justification.  Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
perldiag \- various Perl diagnostics
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
These messages are classified as follows (listed in increasing order of
desperation):
.PP
.Vb 7
\&    (W) A warning (optional).
\&    (D) A deprecation (optional).
\&    (S) A severe warning (enabled by default).
\&    (F) A fatal error (trappable).
\&    (P) An internal error you should never see (trappable).
\&    (X) A very fatal error (nontrappable).
\&    (A) An alien error message (not generated by Perl).
.Ve
.PP
The majority of messages from the first three classifications above
(W, D & S) can be controlled using the \f(CW\*(C`warnings\*(C'\fR pragma.
.PP
If a message can be controlled by the \f(CW\*(C`warnings\*(C'\fR pragma, its warning
category is included with the classification letter in the description
below.
.PP
Optional warnings are enabled by using the \f(CW\*(C`warnings\*(C'\fR pragma or the \fB\-w\fR
and \fB\-W\fR switches. Warnings may be captured by setting \f(CW$SIG{_\|_WARN_\|_}\fR
to a reference to a routine that will be called on each warning instead
of printing it.  See perlvar.
.PP
Severe warnings are always enabled, unless they are explicitly disabled
with the \f(CW\*(C`warnings\*(C'\fR pragma or the \fB\-X\fR switch.
.PP
Trappable errors may be trapped using the eval operator.  See
\&\*(L"eval\*(R" in perlfunc.  In almost all cases, warnings may be selectively
disabled or promoted to fatal errors using the \f(CW\*(C`warnings\*(C'\fR pragma.
See warnings.
.PP
The messages are in alphabetical order, without regard to upper or
lower-case.  Some of these messages are generic.  Spots that vary are
denoted with a \f(CW%s\fR or other printf-style escape.  These escapes are
ignored by the alphabetical order, as are all characters other than
letters.  To look up your message, just ignore anything that is not a
letter.
.ie n .IP "\fIaccept()\fR on closed socket %s" 4
.el .IP "\fIaccept()\fR on closed socket \f(CW%s\fR" 4
.IX Item "accept() on closed socket %s"
(W closed) You tried to do an accept on a closed socket.  Did you forget
to check the return value of your \fIsocket()\fR call?  See
\&\*(L"accept\*(R" in perlfunc.
.ie n .IP "Allocation too large: %lx" 4
.el .IP "Allocation too large: \f(CW%lx\fR" 4
.IX Item "Allocation too large: %lx"
(X) You can't allocate more than 64K on an MS-DOS machine.
.ie n .IP "'%c' allowed only after types %s" 4
.el .IP "'%c' allowed only after types \f(CW%s\fR" 4
.IX Item "'%c' allowed only after types %s"
(F) The modifiers '!', '<' and '>' are allowed in \fIpack()\fR or \fIunpack()\fR only
after certain types.  See \*(L"pack\*(R" in perlfunc.
.IP "Ambiguous call resolved as CORE::%s(), qualify as such or use &" 4
.IX Item "Ambiguous call resolved as CORE::%s(), qualify as such or use &"
(W ambiguous) A subroutine you have declared has the same name as a Perl
keyword, and you have used the name without qualification for calling
one or the other.  Perl decided to call the builtin because the
subroutine is not imported.
.Sp
To force interpretation as a subroutine call, either put an ampersand
before the subroutine name, or qualify the name with its package.
Alternatively, you can import the subroutine (or pretend that it's
imported with the \f(CW\*(C`use subs\*(C'\fR pragma).
.Sp
To silently interpret it as the Perl operator, use the \f(CW\*(C`CORE::\*(C'\fR prefix
on the operator (e.g. \f(CW\*(C`CORE::log($x)\*(C'\fR) or declare the subroutine
to be an object method (see \*(L"Subroutine Attributes\*(R" in perlsub or
attributes).
.IP "Ambiguous range in transliteration operator" 4
.IX Item "Ambiguous range in transliteration operator"
(F) You wrote something like \f(CW\*(C`tr/a\-z\-0//\*(C'\fR which doesn't mean anything at
all.  To include a \f(CW\*(C`\-\*(C'\fR character in a transliteration, put it either
first or last.  (In the past, \f(CW\*(C`tr/a\-z\-0//\*(C'\fR was synonymous with
\&\f(CW\*(C`tr/a\-y//\*(C'\fR, which was probably not what you would have expected.)
.ie n .IP "Ambiguous use of %s\fR resolved as \f(CW%s" 4
.el .IP "Ambiguous use of \f(CW%s\fR resolved as \f(CW%s\fR" 4
.IX Item "Ambiguous use of %s resolved as %s"
(W ambiguous)(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, parenthesis pair or declaration.
.IP "'|' and '<' may not both be specified on command line" 4
.IX Item "'|' and '<' may not both be specified on command line"
(F) An error peculiar to \s-1VMS\s0.  Perl does its own command line
redirection, and found that \s-1STDIN\s0 was a pipe, and that you also tried to
redirect \s-1STDIN\s0 using '<'.  Only one \s-1STDIN\s0 stream to a customer, please.
.IP "'|' and '>' may not both be specified on command line" 4
.IX Item "'|' and '>' may not both be specified on command line"
(F) An error peculiar to \s-1VMS\s0.  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
.Sp
.Vb 6
\&    open(OUT,">$ARGV[0]") or die "Can\*(Aqt write to $ARGV[0]: $!";
\&    while (<STDIN>) {
\&        print;
\&        print OUT;
\&    }
\&    close OUT;
.Ve
.ie n .IP "Applying %s\fR to \f(CW%s will act on scalar(%s)" 4
.el .IP "Applying \f(CW%s\fR to \f(CW%s\fR will act on scalar(%s)" 4
.IX Item "Applying %s to %s will act on scalar(%s)"
(W misc) The pattern match (\f(CW\*(C`//\*(C'\fR), substitution (\f(CW\*(C`s///\*(C'\fR), and
transliteration (\f(CW\*(C`tr///\*(C'\fR) operators work on scalar values.  If you apply
one of them to an array or a hash, it will convert the array or hash to
a scalar value \*(-- the length of an array, or the population info of a
hash \*(-- and then work on that scalar value.  This is probably not what
you meant to do.  See \*(L"grep\*(R" in perlfunc and \*(L"map\*(R" in perlfunc for
alternatives.
.IP "Args must match #! line" 4
.IX Item "Args must match #! line"
(F) The setuid emulator requires that the arguments Perl was invoked
with match the arguments specified on the #! line.  Since some systems