sigreturn man page on CentOS

sigreturn man page on CentOS

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SIGRETURN(2)		   Linux Programmer's Manual		  SIGRETURN(2)

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 sigre‐
       turn() 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 han‐
       dlers. 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)

Linux 1.3.20			  1995-08-21			  SIGRETURN(2)

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