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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.  Applications should use the  sigaction()  with  the
       SA_RESTART flag instead of the obsolescent siginterrupt() function.
RATIONALE
       None.
FUTURE DIRECTIONS
       None.
SEE ALSO
       Section 2.4, Signal Concepts, sigaction()
       The Base Definitions volume of POSIX.1-2008, <signal.h>
COPYRIGHT
       Portions  of  this text are reprinted and reproduced in electronic form
       from IEEE Std 1003.1, 2013 Edition, Standard for Information Technology
       --  Portable  Operating  System  Interface (POSIX), The Open Group Base
       Specifications Issue 7, Copyright (C) 2013 by the Institute of Electri-
       cal  and  Electronics  Engineers,  Inc  and  The  Open Group.  (This is
       POSIX.1-2008 with the 2013 Technical Corrigendum  1  applied.)  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.unix.org/online.html .
       Any typographical or formatting errors that appear  in  this  page  are
       most likely to have been introduced during the conversion of the source
       files to man page format. To report such errors,  see  https://www.ker-
       nel.org/doc/man-pages/reporting_bugs.html .
IEEE/The Open Group                  2013                     SIGINTERRUPT(3P)