The R13B03 release.OTP_R13B03

1 files changed, 145 insertions, 0 deletions

diff --git a/erts/emulator/drivers/unix/mem_drv.c b/erts/emulator/drivers/unix/mem_drv.c
new file mode 100644
index 0000000000..1417ca1121
--- /dev/null
+++ b/erts/emulator/drivers/unix/mem_drv.c
@@ -0,0 +1,145 @@
+/*
+ * %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: Access to elib memory statistics */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include "sys.h"
+#include "erl_driver.h"
+#include "elib_stat.h"
+
+#define MAP_BUF_SIZE    1000   /* Max map size */
+#define HISTO_BUF_SIZE  100    /* Max histogram buckets */
+
+static ErlDrvData mem_start(ErlDrvPort);
+static int mem_init(void); 
+static void mem_stop(ErlDrvData);
+static void mem_command(ErlDrvData, char*, int);
+
+const struct driver_entry mem_driver_entry = {
+    mem_init,
+    mem_start,
+    mem_stop,
+    mem_command,
+    NULL,
+    NULL,
+    "mem_drv"
+};
+
+static int mem_init(void)
+{
+    return 0;
+}
+
+static ErlDrvData mem_start(ErlDrvPort port, char* buf)
+{
+    return (ErlDrvData)port;
+}
+
+static void mem_stop(ErlDrvData port)
+{
+}
+
+void putint32(p, v)
+byte* p; int v;
+{
+    p[0] = (v >> 24) & 0xff;
+    p[1] = (v >> 16) & 0xff;
+    p[2] = (v >> 8) & 0xff;
+    p[3] = (v) & 0xff;
+}
+
+int getint16(p)
+byte* p;
+{
+    return (p[0] << 8) | p[1];
+}
+
+/*
+** Command:
+**   m L1 L0  -> a heap map of length L1*256 + L0 is returned
+**   s        -> X3 X2 X1 X0 Y3 Y2 Y1 Y0 Z3 Z2 Z1 Z0
+**               X == Total heap size bytes
+**               Y == Total free bytes
+**               Z == Size of largest free block in bytes
+**
+**   h L1 L0 B0 -> Generate a logarithm historgram base B with L buckets
+**   l L1 L0 S0 -> Generate a linear histogram with step S with L buckets
+*/
+unsigned char outbuf[HISTO_BUF_SIZE*2*4];
+
+static void mem_command(ErlDrvData port, char* buf, int count)
+{
+    if ((count == 1) && buf[0] == 's') {
+	struct elib_stat info;
+	char v[3*4];
+
+	elib_stat(&info);
+
+	putint32(v, info.mem_total*4);
+	putint32(v+4, info.mem_free*4);
+	putint32(v+8, info.max_free*4);
+	driver_output((ErlDrvPort)port, v, 12);
+	return;
+    }
+    else if ((count == 3) && buf[0] == 'm') {
+	char w[MAP_BUF_SIZE];
+	int n = getint16(buf+1);
+
+	if (n > MAP_BUF_SIZE)
+	    n = MAP_BUF_SIZE;
+	elib_heap_map(w, n);
+	driver_output((ErlDrvPort)port, w, n);
+	return;
+    }
+    else if ((count == 4) && (buf[0] == 'h' || buf[0] == 'l')) {
+	unsigned long vf[HISTO_BUF_SIZE];
+	unsigned long va[HISTO_BUF_SIZE];
+	int n = getint16(buf+1);
+	int base = (unsigned char) buf[3];
+
+	if (n >= HISTO_BUF_SIZE)
+	    n = HISTO_BUF_SIZE;
+	if (buf[0] == 'l')
+	    base = -base;
+	if (elib_histo(vf, va, n, base) < 0) {
+	    driver_failure((ErlDrvPort)port, -1);
+	    return;
+	}
+	else {
+	    char* p = outbuf;
+	    int i;
+
+	    for (i = 0; i < n; i++) {
+		putint32(p, vf[i]);
+		p += 4;
+	    }
+	    for (i = 0; i < n; i++) {
+		putint32(p, va[i]);
+		p += 4;
+	    }
+	    driver_output((ErlDrvPort)port, outbuf, n*8);
+	}
+	return;
+    }
+    driver_failure((ErlDrvPort)port, -1);
+}