operating system services errorcode this dictionary maps errno integers to symbolic names (such as 'eperm'posix error codes the following table shows the posix symbolic names for common system error codes the error codes listed here are supported on almost every version of unixmacintosh os-xand windows different unix systems may provide additional error codes that are less common and not listed here if such errors occuryou can consult the errorcode dictionary to find the appropriate symbolic name to use in your program error code description big eacces eaddrinuse eaddrnotavail eafnosupport eagain ealready ebadf ebusy echild econnaborted econnrefused econnreset edeadlk edeadlock edestaddrreq edom edquot eexist efault efbig ehostdown ehostunreach eilseq einprogress eintr einval eio eisconn eisdir eloop emfile emlink arg list too long permission denied address already in use cannot assign requested address address family not supported by protocol try again operation already in progress bad file number device or resource busy no child processes software caused connection abort connection refused connection reset by peer resource deadlock would occur file-locking deadlock error destination address required math argument out of domain of function quota exceeded file exists bad address file too large host is down no route to host illegal byte sequence operation now in progress interrupted system call invalid argument / error transport endpoint is already connected is directory too many symbolic links encountered too many open files too many links lib fl ff