Changes to st_mode attribute of AF_UNIX socket files

As of z/OS® V2R1, the retrieved file type of AF_UNIX socket files that are returned in st_mode is S_IFSOCK, rather than S_IFCHR. Functions stat(), lstat(), stat_o(), lstat_o(), and __readdir2() are affected.

You must examine programs that use the affected functions and check the type of AF_UNIX socket files to ensure compatibility with the updated function behavior.