Network Programming with Perl

System Error Constants

Perl's Errno.pm module exports system error constants for use with the $! variable. When evaluated in a numeric context, $! returns the error constant listed in the first column of Table B.1. In a string context, $! returns the human-readable message given in the second column.

Table B.1. lists error messages that will be seen in a version of Perl compiled under Linux and glibc version 2.1 but that are reasonably well standardized across other UNIX variants. The Macintosh and Windows ports recognize a subset of these constants. Additionally, these ports have platform-specific errors that are reported in the $^E variable.

Table B.1. Linux and glibc Error Messages

Error Constant	Message
E2BIG	Arg list too long
EACCES ...