From a4b0b9afe5a782a7f4a8fe153ecf51bcb0180ae3 Mon Sep 17 00:00:00 2001
From: Wim Taymans <wtaymans@redhat.com>
Date: Thu, 4 Mar 2021 10:57:48 +0100
Subject: [PATCH] build: check for getrandom and sys/random.h

Fixes #833
---
 config.h.meson           |  4 ++++
 meson.build              |  5 +++++
 src/pipewire/impl-core.c | 23 ++++++++++++++++++-----
 3 files changed, 27 insertions(+), 5 deletions(-)

diff --git a/config.h.meson b/config.h.meson
index e2223d8c5..a5fc15f6b 100644
--- a/config.h.meson
+++ b/config.h.meson
@@ -269,6 +269,9 @@
 /* Define to 1 if you have the <sys/prctl.h> header file. */
 #mesondefine HAVE_SYS_PRCTL_H
 
+/* Define to 1 if you have the <sys/random.h> header file. */
+#mesondefine HAVE_SYS_RANDOM_H
+
 /* Define to 1 if you have the <sys/socket.h> header file. */
 #mesondefine HAVE_SYS_SOCKET_H
 
@@ -473,6 +476,7 @@
 #mesondefine HAVE_DECL_LOCALTIME_R
 #mesondefine HAVE_DECL_STRSIGNAL
 #mesondefine HAVE_MEMFD_CREATE
+#mesondefine HAVE_GETRANDOM
 
 #mesondefine PIPEWIRE_VERSION_MAJOR
 #mesondefine PIPEWIRE_VERSION_MINOR
diff --git a/meson.build b/meson.build
index 6f810221a..b722dbc2b 100644
--- a/meson.build
+++ b/meson.build
@@ -218,6 +218,7 @@ check_headers = [['dlfcn.h','HAVE_DLFCN_H'],
   ['sys/param.h', 'HAVE_SYS_PARAM_H'],
   ['sys/poll.h', 'HAVE_SYS_POLL_H'],
   ['sys/prctl.h', 'HAVE_SYS_PRCTL_H'],
+  ['sys/random.h', 'HAVE_SYS_RANDOM_H'],
   ['sys/socket.h', 'HAVE_SYS_SOCKET_H'],
   ['sys/stat.h', 'HAVE_SYS_STAT_H'],
   ['sys/times.h', 'HAVE_SYS_TIMES_H'],
@@ -272,6 +273,10 @@ if cc.has_function('memfd_create', prefix : '#include <sys/mman.h>', args : [ '-
   cdata.set('HAVE_MEMFD_CREATE', 1)
 endif
 
+if cc.has_function('getrandom', prefix : '#include <sys/random.h>')
+  cdata.set('HAVE_GETRANDOM', 1)
+endif
+
 if get_option('systemd')
   systemd = dependency('systemd', required: false)
   systemd_dep = dependency('libsystemd', required: false)
diff --git a/src/pipewire/impl-core.c b/src/pipewire/impl-core.c
index d491f994a..92909bce6 100644
--- a/src/pipewire/impl-core.c
+++ b/src/pipewire/impl-core.c
@@ -22,20 +22,34 @@
  * DEALINGS IN THE SOFTWARE.
  */
 
+#include "config.h"
+
 #include <unistd.h>
 #include <errno.h>
 #ifndef ENODATA
 #define ENODATA 9919
 #endif
+#if HAVE_SYS_RANDOM_H
 #include <sys/random.h>
+#endif
 
-#ifdef __FreeBSD__
-#include <sys/param.h>
-#include <fcntl.h>
+#undef GETRANDOM_FALLBACK
+#ifndef HAVE_GETRANDOM
+# ifdef __FreeBSD__
+#  include <sys/param.h>
+#  include <fcntl.h>
 // FreeBSD versions < 12 do not have getrandom() syscall
 // Give a poor-man implementation here
 // Can be removed after September 30, 2021
-#if __FreeBSD_version < 1200000
+#  if __FreeBSD_version < 1200000
+#   define GETRANDOM_FALLBACK	1
+#  endif
+# else
+#  define GETRANDOM_FALLBACK	1
+# endif
+#endif
+
+#ifdef GETRANDOM_FALLBACK
 ssize_t getrandom(void *buf, size_t buflen, unsigned int flags) {
 	int fd = open("/dev/random", O_CLOEXEC);
 	if (fd < 0)
@@ -45,7 +59,6 @@ ssize_t getrandom(void *buf, size_t buflen, unsigned int flags) {
 	return bytes;
 }
 #endif
-#endif
 
 #include <spa/debug/types.h>