X-Git-Url: https://git.distorted.org.uk/~mdw/adns/blobdiff_plain/9da4a044c4d2e0a960cf8f33c62774db02f4402d..620c146da30a20c2d9a6c572fdd0540558039d0e:/src/poll.c

diff --git a/src/poll.c b/src/poll.c
new file mode 100644
index 0000000..03f153a
--- /dev/null
+++ b/src/poll.c
@@ -0,0 +1,83 @@
+/*
+ * poll.c
+ * - wrappers for poll(2)
+ */
+/*
+ *  This file is part of adns, which is Copyright (C) 1997-1999 Ian Jackson
+ *  
+ *  This program is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation; either version 2, or (at your option)
+ *  any later version.
+ *  
+ *  This program 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 General Public License for more details.
+ *  
+ *  You should have received a copy of the GNU General Public License
+ *  along with this program; if not, write to the Free Software Foundation,
+ *  Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. 
+ */
+
+#include <limits.h>
+
+#include "internal.h"
+
+#ifdef HAVE_POLL
+
+int adns_beforepoll(adns_state ads, struct pollfd *fds, int *nfds_io, int *timeout_io,
+		    const struct timeval *now) {
+  struct timeval tv_nowbuf, tv_tobuf, *tv_to;
+  int space, found, timeout_ms;
+  struct pollfd fds_tmp[MAX_POLLFDS];
+
+  adns__must_gettimeofday(ads,&now,&tv_nowbuf);
+  if (!now) { *nfds_io= 0; return 0; }
+
+  timeout_ms= *timeout_io;
+  if (timeout_ms == -1) {
+    tv_to= 0;
+  } else {
+    tv_tobuf.tv_sec= timeout_ms / 1000;
+    tv_tobuf.tv_usec= (timeout_ms % 1000)*1000;
+    tv_to= &tv_tobuf;
+  }
+
+  adns__timeouts(ads, 1, &tv_to,&tv_tobuf, *now);
+
+  if (tv_to) {
+    assert(tv_to == &tv_tobuf);
+    timeout_ms= (tv_tobuf.tv_usec+999)/1000;
+    assert(tv_tobuf.tv_sec < (INT_MAX-timeout_ms)/1000);
+    timeout_ms += tv_tobuf.tv_sec*1000;
+  } else {
+    timeout_ms= -1;
+  }
+  *timeout_io= timeout_ms;
+  
+  space= *nfds_io;
+  if (space >= MAX_POLLFDS) {
+    found= adns__pollfds(ads,fds);
+    *nfds_io= found;
+  } else {
+    found= adns__pollfds(ads,fds_tmp);
+    *nfds_io= found;
+    if (found < space) return space ? ERANGE : 0;
+    memcpy(fds,fds_tmp,sizeof(struct pollfd)*found);
+  }
+  return 0;
+}
+
+void adns_afterpoll(adns_state ads, const struct pollfd *fds, int nfds,
+		    const struct timeval *now) {
+  struct timeval tv_buf;
+
+  adns__must_gettimeofday(ads,&now,&tv_buf);
+  if (!now) return;
+
+  adns__timeouts(ads,1, 0,0, *now);
+  adns__fdevents(ads, fds,nfds, 0,0,0,0, *now,0);
+}
+
+#endif