diff -up man-pages-3.30/man2/prctl.2.pom man-pages-3.30/man2/prctl.2
--- man-pages-3.30/man2/prctl.2.pom	2010-11-01 15:55:38.000000000 +0100
+++ man-pages-3.30/man2/prctl.2	2010-11-18 14:42:50.000000000 +0100
@@ -236,9 +236,15 @@ After the secure computing mode has been
 the only system calls that the thread is permitted to make are
 .BR read (2),
 .BR write (2),
-.BR _exit (2),
+.BR sigreturn (2)
 and
-.BR sigreturn (2).
+.BR _exit (2).
+In glibc up to version 2.3, the
+.BR _exit()
+wrapper function invoked the kernel system call of the same name.
+Since glibc 2.3, the  wrapper  function
+invokes
+.BR exit_group(2).
 Other system calls result in the delivery of a
 .BR SIGKILL
 signal.