This manual page is part of the POSIX Programmer's Manual. The Linux implementation of this interface

       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.

       Portions of this text are reprinted and reproduced in electronic form from IEEE Std 1003.1-2017, Standard
       for Information  Technology  --  Portable  Operating  System  Interface  (POSIX),  The  Open  Group  Base
       Specifications  Issue  7, 2018 Edition, Copyright (C) 2018 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 .

       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.kernel.org/doc/man-pages/reporting_bugs.html .

IEEE/The Open Group                                   2017                                  SIGINTERRUPT(3POSIX)

       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;
           }

       The siginterrupt() function shall fail if:

       EINVAL The sig argument is not a valid signal number.

       Thefollowingsectionsareinformative.

       None.

       None.

       siginterrupt — allow signals to interrupt functions

       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.

       None.

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

Section2.4, SignalConcepts, sigaction()

       The Base Definitions volume of POSIX.1‐2017, <signal.h>

       #include <signal.h>

       int siginterrupt(int sig, int flag);