--- /dev/null
+/* Copyright (C) 1992, 1994, 1996 Free Software Foundation, Inc.
+ This file is part of the GNU C Library.
+
+ The GNU C Library is free software; you can redistribute it and/or
+ modify it under the terms of the GNU Library General Public License as
+ published by the Free Software Foundation; either version 2 of the
+ License, or (at your option) any later version.
+
+ The GNU C Library is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ Library General Public License for more details.
+
+ You should have received a copy of the GNU Library General Public
+ License along with the GNU C Library; see the file COPYING.LIB. If not,
+ write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ Boston, MA 02111-1307, USA. */
+
+#include <stddef.h>
+#include <signal.h>
+#include <errno.h>
+
+/* If INTERRUPT is nonzero, make signal SIG interrupt system calls
+ (causing them to fail with EINTR); if INTERRUPT is zero, make system
+ calls be restarted after signal SIG. */
+int
+siginterrupt (sig, interrupt)
+ int sig;
+ int interrupt;
+{
+#ifdef SA_RESTART
+ extern sigset_t _sigintr; /* Defined in signal.c. */
+ struct sigaction action;
+
+ if (sigaction (sig, (struct sigaction *) NULL, &action) < 0)
+ return -1;
+
+ if (interrupt)
+ {
+ sigaddset (&_sigintr, sig);
+ action.sa_flags &= ~SA_RESTART;
+ }
+ else
+ {
+ sigdelset (&_sigintr, sig);
+ action.sa_flags |= SA_RESTART;
+ }
+
+ if (sigaction (sig, &action, (struct sigaction *) NULL) < 0)
+ return -1;
+
+ return 0;
+#else
+ __set_errno (ENOSYS);
+ return -1;
+#endif
+}