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errno/permconstant
errno/noentconstant
errno/srchconstant
errno/intrconstant
errno/ioconstant
errno/noexecconstant
errno/badfconstant
errno/childconstant
errno/nomemconstant
errno/accesconstant
errno/faultconstant
errno/busyconstant
errno/notdirconstant
errno/isdirconstant
errno/invalconstant
errno/mfileconstant
errno/nospcconstant
errno/spipeconstant
errno/pipeconstant
errno/againconstant
errno/rofsconstant
errno/existconstant
errno/wouldblockconstant

These variables contain error codes as returned by errno.

NOTE: On Windows, EWOULDBLOCK does not exist. For consistency, errno/wouldblock does exist, but it is defined as zero.

This does mean that in case there is no error, it looks like the errno/wouldblock error is returned. But you have to check the return code of a system call before accessing errno anyway, so this should typically never happen.