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, Copyright (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.opengroup.org/unix/online.html .