1 files changed, 71 insertions, 0 deletions
diff --git a/vendor/github.com/google/gopacket/pcap/pcap_unix.go b/vendor/github.com/google/gopacket/pcap/pcap_unix.go
new file mode 100644
index 0000000..b2a6dcd
--- /dev/null
+++ b/vendor/github.com/google/gopacket/pcap/pcap_unix.go
@@ -0,0 +1,71 @@
+// Copyright 2012 Google, Inc. All rights reserved.
+// Copyright 2009-2011 Andreas Krennmair. All rights reserved.
+//
+// Use of this source code is governed by a BSD-style license
+// that can be found in the LICENSE file in the root of the source
+// tree.
+//
+// +build !windows
+
+package pcap
+
+/*
+#include <stdlib.h>
+#include <pcap.h>
+
+// pcap_wait returns when the next packet is available or the timeout expires.
+// Since it uses pcap_get_selectable_fd, it will not work in Windows.
+int pcap_wait(pcap_t *p, int usec) {
+	fd_set fds;
+	int fd;
+	struct timeval tv;
+
+	fd = pcap_get_selectable_fd(p);
+	if(fd < 0) {
+		return fd;
+	}
+
+	FD_ZERO(&fds);
+	FD_SET(fd, &fds);
+
+	tv.tv_sec = 0;
+	tv.tv_usec = usec;
+
+	if(usec != 0) {
+		return select(fd+1, &fds, NULL, NULL, &tv);
+	}
+
+	// block indefinitely if no timeout provided
+	return select(fd+1, &fds, NULL, NULL, NULL);
+}
+*/
+import "C"
+
+import (
+	"errors"
+	"unsafe"
+)
+
+func (p *Handle) openLive() error {
+	buf := (*C.char)(C.calloc(errorBufferSize, 1))
+	defer C.free(unsafe.Pointer(buf))
+
+	// Change the device to non-blocking, we'll use pcap_wait to wait until the
+	// handle is ready to read.
+	if v := C.pcap_setnonblock(p.cptr, 1, buf); v == -1 {
+		return errors.New(C.GoString(buf))
+	}
+
+	return nil
+}
+
+// waitForPacket waits for a packet or for the timeout to expire.
+func (p *Handle) waitForPacket() {
+	// need to wait less than the read timeout according to pcap documentation.
+	// timeoutMillis rounds up to at least one millisecond so we can safely
+	// subtract up to a millisecond.
+	usec := timeoutMillis(p.timeout) * 1000
+	usec -= 100
+
+	C.pcap_wait(p.cptr, usec)
+}