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Errno - Constant representing system error number

You can use the Errno module to import constants that represent system error numbers.

use Errno qw/EAGAIN EINTR ECONNRESET EWOULDBLOCK/;

Please refer to here for the types of constants that can be imported.

• Unix errno list

You can find out what kind of error occurred by numerically comparing the system call error with the predefined variable $! To which it is assigned.

# Call some system call
# ...

# Compare error numbers
if ($! == EAGAIN) {

}

Please note that $! Is a predefined variable and is evaluated as an error number when a numerical comparison is performed, and as an error content when used as a string.