personality, sigreturn − undocumented system calls

Undocumented system calls.

As of Linux 1.3.6, there are 144 system calls listed in This
man page mentions those calls which are implemented in the
kernel but not yet documented in man pages.  Some of these
calls do not have prototypes in the DLL 4.6.27 include

If you have information about these system calls, please
look in the kernel source code, write a man page (using a
style similar to that of the other Linux section 2 man
pages), and send it to aeb@cwi.nl for inclusion in the next
man page release from the Linux Documentation Project.