https://docs.oracle.com/cd/E88353_01/html/E37846/fesetenv-3m.html
fesetenv - man pages section 3: Extended Library Functions, Volume 2
fegetenv , fesetenv - get and set current floating-point environment The fegetenv() function attempts to store the current floating-point environment in the...
man pagesextended librarysectionfunctionsvolume
https://lists.debian.org/debian-glibc/2005/11/msg00141.html
Bug#339319: marked as done (Bug in fesetenv() [LIBC6.1])
bugmarkeddone