SIGRETURN(2) Linux Programmers Manual SIGRETURN(2)
sigreturn - return from signal handler and cleanup stack frame
int sigreturn(unsigned long __unused);
When the Linux kernel creates the stack frame for a signal handler, a
call to sigreturn() is inserted into the stack frame so that upon
return from the signal handler, sigreturn() will be called.
This sigreturn() call undoes everything that was donechanging the pro
cesss signal mask, switching stacks (see sigaltstack(2))in order to
invoke the signal handler: it restores the processs signal mask,
switches stacks, and restores the processs context (registers, proces
sor flags), so that the process directly resumes execution at the point
where it was interrupted by the signal.
sigreturn() never returns.
sigreturn() is specific to Linux and should not be used in programs
intended to be portable.
The sigreturn() call is used by the kernel to implement signal han
dlers. It should never be called directly. Better yet, the specific
use of the __unused argument varies depending on the architecture.
kill(2), sigaltstack(2), signal(2), signal(7)
This page is part of release 3.05 of the Linux man-pages project. A
description of the project, and information about reporting bugs, can
be found at http://www.kernel.org/doc/man-pages/.
Linux 2008-06-26 SIGRETURN(2)