aboutsummaryrefslogtreecommitdiffstats
path: root/erts/emulator/drivers/unix/multi_drv.c
diff options
context:
space:
mode:
authorErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
committerErlang/OTP <[email protected]>2009-11-20 14:54:40 +0000
commit84adefa331c4159d432d22840663c38f155cd4c1 (patch)
treebff9a9c66adda4df2106dfd0e5c053ab182a12bd /erts/emulator/drivers/unix/multi_drv.c
downloadotp-84adefa331c4159d432d22840663c38f155cd4c1.tar.gz
otp-84adefa331c4159d432d22840663c38f155cd4c1.tar.bz2
otp-84adefa331c4159d432d22840663c38f155cd4c1.zip
The R13B03 release.OTP_R13B03
Diffstat (limited to 'erts/emulator/drivers/unix/multi_drv.c')
-rw-r--r--erts/emulator/drivers/unix/multi_drv.c105
1 files changed, 105 insertions, 0 deletions
diff --git a/erts/emulator/drivers/unix/multi_drv.c b/erts/emulator/drivers/unix/multi_drv.c
new file mode 100644
index 0000000000..822c96730c
--- /dev/null
+++ b/erts/emulator/drivers/unix/multi_drv.c
@@ -0,0 +1,105 @@
+/*
+ * %CopyrightBegin%
+ *
+ * Copyright Ericsson AB 1996-2009. All Rights Reserved.
+ *
+ * The contents of this file are subject to the Erlang Public License,
+ * Version 1.1, (the "License"); you may not use this file except in
+ * compliance with the License. You should have received a copy of the
+ * Erlang Public License along with this software. If not, it can be
+ * retrieved online at http://www.erlang.org/.
+ *
+ * Software distributed under the License is distributed on an "AS IS"
+ * basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
+ * the License for the specific language governing rights and limitations
+ * under the License.
+ *
+ * %CopyrightEnd%
+ */
+
+/* Purpose: Multidriver interface
+ This is an example of a driver which allows multiple instances of itself.
+ I.e have one erlang process execute open_port(multi......) and
+ at the same time have an other erlang process open an other port
+ running multi there as well.
+*/
+
+#ifdef HAVE_CONFIG_H
+# include "config.h"
+#endif
+
+#include "erl_driver.h"
+#include "sys.h"
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+
+#define MAXCHANNEL 20
+
+static char buf[BUFSIZ];
+
+static ErlDrvData multi_start(ErlDrvPort, char*);
+static int multi_init(void);
+static void multi_stop(ErlDrvData),multi_erlang_read(ErlDrvData, char*, int);
+
+struct driver_entry multi_driver_entry = {
+ multi_init,
+ multi_start,
+ multi_stop,
+ multi_erlang_read,
+ NULL,
+ NULL,
+ "multi"
+};
+
+
+struct channel {
+ ErlDrvPort portno;
+ int channel;
+};
+
+struct channel channels[MAXCHANNEL]; /* Max MAXCHANNEL instances */
+
+static int multi_init(void)
+{
+ memzero(channels,MAXCHANNEL * sizeof(struct channel));
+ return 0;
+}
+
+static ErlDrvData multi_start(ErlDrvPort port, char* buf)
+{
+ int chan;
+ chan = get_new_channel();
+ channels[port].portno = port;
+ channels[port].channel = chan;
+ fprintf(stderr,"Opening channel %d port is %d\n",chan,port);
+ return (ErlDrvData)port;
+}
+
+
+static int multi_stop(ErlDrvData port)
+{
+ fprintf(stderr,"Closing channel %d\n",channels[port].channel);
+ remove_channel(channels[(int)port].channel);
+}
+
+
+static int multi_erlang_read(ErlDrvData port, char* buf, int count)
+{
+ fprintf(stderr,"Writing %d bytes to channel %d\n",
+ count,
+ channels[(int)port].channel);
+}
+
+
+/* These two funs are fake */
+
+int get_new_channel()
+{
+ static int ch = 1;
+ return(ch++);
+}
+
+void remove_channel(int ch)
+{
+}