APR::Status (3)
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NAME
APR::Status - Perl Interface to the APR_STATUS_IS_* macrosSynopsis
use APR::Status ();
eval { $obj->mp_method() };
if ($@ && $ref $@ eq 'APR::Error' && APR::Status::is_EAGAIN($@)) {
# APR_STATUS_IS_EAGAIN(s) of apr_errno.h is satisfied
}
Description
An interface to apr_errno.h composite error codes.As discussed in the "APR::Error" manpage, it is possible to handle APR/Apache/mod_perl exceptions in the following way:
eval { $obj->mp_method() };
if ($@ && $ref $@ eq 'APR::Error' && $@ == $some_code)
warn "handled exception: $@";
}
However, in cases where $some_code is an APR::Const constant, there may be more than one condition satisfying the intent of this exception. For this purpose the
#define APR_STATUS_IS_EAGAIN(s) ((s) == APR_EAGAIN \
|| (s) == APR_OS_START_SYSERR + ERROR_NO_DATA \
|| (s) == APR_OS_START_SYSERR + SOCEWOULDBLOCK \
|| (s) == APR_OS_START_SYSERR + ERROR_LOCK_VIOLATION)
The purpose of "APR::Status" is to provide functions corresponding to these macros.
Functions
is_EACCES
Check if the error is matching "EACCES" and its variants (corresponds to the "APR_STATUS_IS_EACCES" macro).
$status = APR::Status::is_EACCES($error_code);
- arg1: $error_code (integer or APR::Error object )
- The error code or to check, normally $@ blessed into "APR::Error object".
- ret: $status ( boolean )
- since: 2.0.00
An example of using "is_EACCES" is when reading the contents of a file where access may be forbidden:
eval { $obj->slurp_filename(0) };
if ($@) {
return Apache2::Const::FORBIDDEN
if ref $@ eq 'APR::Error' && APR::Status::is_EACCES($@);
die $@;
}
Due to possible variants in conditions matching "EACCES", the use of this function is recommended for checking error codes against this value, rather than just using "APR::Const::EACCES" directly.
is_EAGAIN
Check if the error is matching "EAGAIN" and its variants (corresponds to the "APR_STATUS_IS_EAGAIN" macro).
$status = APR::Status::is_EAGAIN($error_code);
- arg1: $error_code (integer or APR::Error object )
- The error code or to check, normally $@ blessed into "APR::Error object".
- ret: $status ( boolean )
- since: 2.0.00
For example, here is how you may want to handle socket read exceptions and do retries:
use APR::Status ();
# ....
my $tries = 0;
my $buffer;
RETRY: my $rlen = eval { $socket->recv($buffer, SIZE) };
if ($@ && ref($@) && APR::Status::is_EAGAIN($@)) {
if ($tries++ < 3) {
goto RETRY;
}
else {
# do something else
}
}
else {
die "eval block has failed: $@";
}
Notice that just checking against "APR::Const::EAGAIN" may work on some Unices, but then it will certainly break on win32. Thefore make sure to use this macro and not "APR::Const::EAGAIN" unless you know what you are doing.
is_ENOENT
Check if the error is matching "ENOENT" and its variants (corresponds to the "APR_STATUS_IS_ENOENT" macro).
$status = APR::Status::is_ENOENT($error_code);
- arg1: $error_code (integer or APR::Error object )
- The error code or to check, normally $@ blessed into "APR::Error object".
- ret: $status ( boolean )
- since: 2.0.00
An example of using "is_ENOENT" is when reading the contents of a file which may not exist:
eval { $obj->slurp_filename(0) };
if ($@) {
return Apache2::Const::NOT_FOUND
if ref $@ eq 'APR::Error' && APR::Status::is_ENOENT($@);
die $@;
}
Due to possible variants in conditions matching "ENOENT", the use of this function is recommended for checking error codes against this value, rather than just using "APR::Const::ENOENT" directly.
is_EOF
Check if the error is matching "EOF" and its variants (corresponds to the "APR_STATUS_IS_EOF" macro).
$status = APR::Status::is_EOF($error_code);
- arg1: $error_code (integer or APR::Error object )
- The error code or to check, normally $@ blessed into "APR::Error object".
- ret: $status ( boolean )
- since: 2.0.00
Due to possible variants in conditions matching "EOF", the use of this function is recommended for checking error codes against this value, rather than just using "APR::Const::EOF" directly.
is_ECONNABORTED
Check if the error is matching "ECONNABORTED" and its variants (corresponds to the "APR_STATUS_IS_ECONNABORTED" macro).
$status = APR::Status::is_ECONNABORTED($error_code);
- arg1: $error_code (integer or APR::Error object )
- The error code or to check, normally $@ blessed into "APR::Error object".
- ret: $status ( boolean )
- since: 2.0.00
Due to possible variants in conditions matching "ECONNABORTED", the use of this function is recommended for checking error codes against this value, rather than just using "APR::Const::ECONNABORTED" directly.
is_ECONNRESET
Check if the error is matching "ECONNRESET" and its variants (corresponds to the "APR_STATUS_IS_ECONNRESET" macro).
$status = APR::Status::is_ECONNRESET($error_code);
- arg1: $error_code (integer or APR::Error object )
- The error code or to check, normally $@ blessed into "APR::Error object".
- ret: $status ( boolean )
- since: 2.0.00
Due to possible variants in conditions matching "ECONNRESET", the use of this function is recommended for checking error codes against this value, rather than just using "APR::Const::ECONNRESET" directly.
is_TIMEUP
Check if the error is matching "TIMEUP" and its variants (corresponds to the "APR_STATUS_IS_TIMEUP" macro).
$status = APR::Status::is_TIMEUP($error_code);
- arg1: $error_code (integer or APR::Error object )
- The error code or to check, normally $@ blessed into "APR::Error object".
- ret: $status ( boolean )
- since: 2.0.00
Due to possible variants in conditions matching "TIMEUP", the use of this function is recommended for checking error codes against this value, rather than just using "APR::Const::TIMEUP" directly.