SIGINTERRUPT(3P)                                    POSIX Programmer's Manual                                   SIGINTERRUPT(3P)



PROLOG
       This  manual  page is part of the POSIX Programmer's Manual.  The Linux implementation of this interface may differ (con-
       sult the corresponding Linux manual page for details of Linux behavior), or the  interface  may  not  be  implemented  on
       Linux.

NAME
       siginterrupt - allow signals to interrupt functions

SYNOPSIS
       #include <signal.h>

       int siginterrupt(int sig, int flag);


DESCRIPTION
       The siginterrupt() function shall change the restart behavior when a function is interrupted by the specified signal. The
       function siginterrupt(sig, flag) has an effect as if implemented as:


              int siginterrupt(int sig, int flag) {
                  int ret;
                  struct sigaction act;


                  (void) sigaction(sig, NULL, &act);
                  if (flag)
                      act.sa_flags &= ~SA_RESTART;
                  else
                      act.sa_flags |= SA_RESTART;
                  ret = sigaction(sig, &act, NULL);
                  return ret;
              }

RETURN VALUE
       Upon successful completion, siginterrupt() shall return 0; otherwise, -1 shall be returned and errno set to indicate  the
       error.

ERRORS
       The siginterrupt() function shall fail if:

       EINVAL The sig argument is not a valid signal number.


       The following sections are informative.

EXAMPLES
       None.

APPLICATION USAGE
       The  siginterrupt()  function  supports  programs written to historical system interfaces. A conforming application, when
       being written or rewritten, should use sigaction() with the SA_RESTART flag instead of siginterrupt().

RATIONALE
       None.

FUTURE DIRECTIONS
       None.

SEE ALSO
       Signal Concepts, sigaction(), the Base Definitions volume of IEEE Std 1003.1-2001, <signal.h>

COPYRIGHT
       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1, 2003  Edition,  Standard  for
       Information  Technology -- Portable Operating System Interface (POSIX), The Open Group Base Specifications Issue 6, Copy-
       right (C) 2001-2003 by the Institute of Electrical and Electronics Engineers, Inc and The Open Group. In the event of any
       discrepancy  between this version and the original IEEE and The Open Group Standard, the original IEEE and The Open Group
       Standard  is  the  referee   document.   The   original   Standard   can   be   obtained   online   at   http://www.open-
       group.org/unix/online.html .



IEEE/The Open Group                                           2003                                              SIGINTERRUPT(3P)