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NAME
       sigreturn - return from signal handler and cleanup stack frame


SYNOPSIS
       int sigreturn(unsigned long __unused);


DESCRIPTION
       When  the  Linux kernel creates the stack frame for a signal handler, a
       call to sigreturn() is inserted into the stack frame so that the signal
       handler  will  call  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.


RETURN VALUE
       sigreturn() never returns.


WARNING
       The  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.


CONFORMING TO
       sigreturn()  is  specific  to  Linux and should not be used in programs
       intended to be portable.


FILES
       /usr/src/linux/arch/i386/kernel/signal.c
       /usr/src/linux/arch/alpha/kernel/entry.S


SEE ALSO
       kill(2), signal(2), signal(7)