big s/polyp/pulse/g

git-svn-id: file:///home/lennart/svn/public/pulseaudio/trunk@1033 fefdeb5f-60dc-0310-8127-8f9354f1896f

src/pulsecore/random.c

@@ -0,0 +1,108 @@
+/* $Id$ */
+
+/***
+  This file is part of PulseAudio.
+ 
+  PulseAudio is free software; you can redistribute it and/or modify
+  it under the terms of the GNU Lesser General Public License as
+  published by the Free Software Foundation; either version 2.1 of the
+  License, or (at your option) any later version.
+ 
+  PulseAudio 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
+  Lesser General Public License for more details.
+ 
+  You should have received a copy of the GNU Lesser General Public
+  License along with PulseAudio; if not, write to the Free Software
+  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
+  USA.
+***/
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#include <string.h>
+#include <stdlib.h>
+#include <assert.h>
+#include <time.h>
+
+#include <pulsecore/core-util.h>
+#include <pulsecore/log.h>
+
+#include "random.h"
+
+static int has_whined = 0;
+
+static const char *devices[] = { "/dev/urandom", "/dev/random", NULL };
+
+static int random_proper(void *ret_data, size_t length) {
+#ifdef OS_IS_WIN32
+    assert(ret_data && length);
+
+    return -1;
+
+#else /* OS_IS_WIN32 */
+
+    int fd, ret = -1;
+    ssize_t r = 0;
+    const char **device;
+
+    assert(ret_data && length);
+
+    device = devices;
+
+    while (*device) {
+        ret = 0;
+
+        if ((fd = open(*device, O_RDONLY)) >= 0) {
+
+            if ((r = pa_loop_read(fd, ret_data, length)) < 0 || (size_t) r != length)
+                ret = -1;
+
+            close(fd);
+        } else
+            ret = -1;
+
+        if (ret == 0)
+            break;
+    }
+
+    return ret;
+#endif /* OS_IS_WIN32 */
+}
+
+void pa_random_seed(void) {
+    unsigned int seed;
+
+    if (random_proper(&seed, sizeof(unsigned int)) < 0) {
+        if (!has_whined)
+            pa_log_warn(__FILE__": failed to get proper entropy. Falling back to seeding with current time.");
+        has_whined = 1;
+
+        seed = (unsigned int) time(NULL);
+    }
+
+    srand(seed);
+}
+
+void pa_random(void *ret_data, size_t length) {
+    uint8_t *p;
+    size_t l;
+
+    assert(ret_data && length);
+
+    if (random_proper(ret_data, length) >= 0)
+        return;
+
+    if (!has_whined)
+        pa_log_warn(__FILE__": failed to get proper entropy. Falling back to unsecure pseudo RNG.");
+    has_whined = 1;
+
+    for (p = ret_data, l = length; l > 0; p++, l--)
+        *p = (uint8_t) rand();
+}