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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 (consult 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 siginter-
       rupt(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 .

IEEE/The Open Group                  2003                     SIGINTERRUPT(3P)