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
sigreturn() is inserted into the stack frame so that the signal handler will
sigreturn() upon return. This inserted call to
sigreturn() cleans up the stack so that the process can restart from where it was
interrupted by the signal.
sigreturn() never returns.
sigreturn() call is used by the kernel to implement signal handlers. It should
never be called directly. Better yet, the specific use of the
__unused argument varies depending on the architecture.
sigreturn() is specific to Linux and should not be used in programs intended to be