Add sigintr, from a patch by Michael Shmulevich

libc/signal/Makefile

@@ -24,7 +24,7 @@ TOPDIR=../
 include $(TOPDIR)Rules.mak
 LIBC=$(TOPDIR)libc.a
 
-CSRC=bsd_sig.c raise.c sigblock.c siggtmsk.c sigjmp.c signal.c \
+CSRC=bsd_sig.c raise.c sigblock.c siggtmsk.c sigjmp.c signal.c sigintr.c\
 	sigpause.c sigstmsk.c sigaddset.c sigdelset.c sigismem.c sigemptyset.c
 COBJS=$(patsubst %.c,%.o, $(CSRC))
 

libc/signal/sigintr.c

@@ -0,0 +1,57 @@
+/* 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
+}