mkdir(2) prefers EACCES over EEXIST

This isn't _really_ a bug, more of an oddity. Calling mkdir(2) on an existing directory will fail with EACCES instead of EEXIST if the directory couldn't have been created in the first place. For example, this is the typical situation for /cygdrive/c: mkdir("/cygdrive/c", 0700); // errno

Error from signal.h when _POSIX_C_SOURCE == 1

A two-line source file demonstrates this bug: #define _POSIX_C_SOURCE 1 #include Then when compiled: $ gcc -c tmp.c In file included from /usr/include/sys/signal.h:22:0, from /usr/include/signal.h:6, from tmp.c:2: /usr/include/cygwin/signa