Comment by kragen

How unfortunate that glibc has removed support for unexec. Although it wasn't a very widely used feature, it seems like the kind of orthogonal powerful feature that distinguishes one platform from another, like Unix's fork(), or I/O redirection, or strace, or not needing different system calls to write text and binary files. In an alternate universe, you could imagine unexec support being generalized to support broader classes of applications for purposes such as process migration, high-availability failover, and bug reproduction (as with rr), instead of being removed.