Even the kernel occasionally breaks interfaces. Case in point, FUTEX_FD was introduced in 2.6.0 and retired in 2.6.26 [1]. I don't think anyone working on glib

Even the kernel occasionally breaks interfaces. Case in point, FUTEX_FD was introduced in 2.6.0 and retired in 2.6.26 [1]. I don't think anyone working on glibc is intent on breaking user space. Sometimes it's just the most pragmatic solution. [1] http://man7.org/linux/man-pages/man2/futex.2.html http://man7.org/linux/man-pages/man2/futex.2.html