utils: export pw_getrandom

Export the symbol and move it to utils.

src/pipewire/impl-core.c

@@ -25,34 +25,12 @@
 #include "config.h"
 
 #include <unistd.h>
-#include <errno.h>
-#include <fcntl.h>
 #ifndef ENODATA
 #define ENODATA 9919
 #endif
-#if HAVE_SYS_RANDOM_H
-#include <sys/random.h>
-#endif
 
-static ssize_t pw_getrandom(void *buf, size_t buflen, unsigned int flags) {
-	ssize_t bytes;
-
-#ifdef HAVE_GETRANDOM
-	bytes = getrandom(buf, buflen ,flags);
-	if (!(bytes == -1 && errno == ENOSYS))
-		return bytes;
-#endif
-
-	int fd = open("/dev/urandom", O_CLOEXEC);
-	if (fd < 0)
-		return -1;
-	bytes = read(fd, buf, buflen);
-	close(fd);
-	return bytes;
-}
-
-#include <spa/utils/string.h>
 #include <spa/debug/types.h>
+#include <spa/utils/string.h>
 
 #include "pipewire/impl.h"
 #include "pipewire/private.h"

src/pipewire/utils.c

@@ -22,6 +22,14 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
+#include "config.h"
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <errno.h>
+#if HAVE_SYS_RANDOM_H
+#include <sys/random.h>
+#endif
 #include <string.h>
 
 #include <pipewire/array.h>
@@ -133,3 +141,30 @@ char *pw_strip(char *str, const char *whitespace)
 
 	return str;
 }
+
+/** Fill a buffer with random data
+ * \param buf a buffer to fill
+ * \param buflen the number of bytes to fill
+ * \param flags optional flags
+ * \return the number of bytes filled
+ *
+ * Fill \a buf with \a buflen random bytes.
+ */
+SPA_EXPORT
+ssize_t pw_getrandom(void *buf, size_t buflen, unsigned int flags)
+{
+	ssize_t bytes;
+
+#ifdef HAVE_GETRANDOM
+	bytes = getrandom(buf, buflen, flags);
+	if (!(bytes == -1 && errno == ENOSYS))
+		return bytes;
+#endif
+
+	int fd = open("/dev/urandom", O_CLOEXEC);
+	if (fd < 0)
+		return -1;
+	bytes = read(fd, buf, buflen);
+	close(fd);
+	return bytes;
+}

src/pipewire/utils.h

@@ -85,6 +85,7 @@ pw_strip(char *str, const char *whitespace);
 	})
 #endif
 
+ssize_t pw_getrandom(void *buf, size_t buflen, unsigned int flags);
 /**
  * \}
  */