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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  upon
       return from the signal handler, sigreturn() will be called.

       This  sigreturn()  call  undoes  everything  that was done—changing the
       process’s signal mask, switching stacks (see  sigaltstack(2))—in  order
       to  invoke  the  signal handler: it restores the process’s signal mask,
       switches  stacks,  and  restores  the  process’s  context   (registers,
       processor flags), so that the process directly resumes execution at the
       point where it was interrupted by the signal.

RETURN VALUE

       sigreturn() never returns.

FILES

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

CONFORMING TO

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

NOTES

       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.

SEE ALSO

       kill(2), sigaltstack(2), signal(2), signal(7)

COLOPHON

       This page is part of release 3.23 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/.