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

IEEE/The Open Group                                   2013                                  SIGINTERRUPT(3POSIX)