gallium/winsys: replace calls to dup(2) with fcntl(F_DUPFD_CLOEXEC)

Without this fix, duplicated file descriptors leak into child processes.
See commit aaac913e90 for one instance
where the same fix was employed.

Cc: <mesa-stable@lists.freedesktop.org>
Signed-off-by: Matt Whitlock <freedesktop@mattwhitlock.name>
Reviewed-by: Nicolai Hähnle <nicolai.haehnle@amd.com>
(cherry picked from commit 42ed8a6c9c)

src/gallium/winsys/nouveau/drm/nouveau_drm_winsys.c

@@ -1,5 +1,6 @@
 #include <sys/stat.h>
 #include <unistd.h>
+#include <fcntl.h>
 #include "pipe/p_context.h"
 #include "pipe/p_state.h"
 #include "util/u_format.h"
@@ -91,7 +92,7 @@ nouveau_drm_screen_create(int fd)
 	 * nouveau_device_wrap does not close the fd in case of a device
 	 * creation error.
 	 */
-	dupfd = dup(fd);
+	dupfd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
 
 	ret = nouveau_drm_new(dupfd, &drm);
 	if (ret)

src/gallium/winsys/radeon/drm/radeon_drm_winsys.c

@@ -44,6 +44,7 @@
 #include <sys/types.h>
 #include <sys/stat.h>
 #include <unistd.h>
+#include <fcntl.h>
 #include <radeon_surface.h>
 
 #ifndef RADEON_INFO_ACTIVE_CU_COUNT
@@ -790,7 +791,7 @@ radeon_drm_winsys_create(int fd, radeon_screen_create_t screen_create)
         return NULL;
     }
 
-    ws->fd = dup(fd);
+    ws->fd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
 
     if (!do_winsys_init(ws))
         goto fail1;

src/gallium/winsys/svga/drm/vmw_screen.c

@@ -39,6 +39,7 @@
 #endif
 #include <sys/stat.h>
 #include <unistd.h>
+#include <fcntl.h>
 
 static struct util_hash_table *dev_hash = NULL;
 
@@ -88,7 +89,7 @@ vmw_winsys_create( int fd )
 
    vws->device = stat_buf.st_rdev;
    vws->open_count = 1;
-   vws->ioctl.drm_fd = dup(fd);
+   vws->ioctl.drm_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
    vws->base.have_gb_dma = TRUE;
    vws->base.need_to_rebind_resources = FALSE;
 

src/gallium/winsys/vc4/drm/vc4_drm_winsys.c

@@ -22,6 +22,7 @@
  */
 
 #include <unistd.h>
+#include <fcntl.h>
 
 #include "vc4_drm_public.h"
 
@@ -30,5 +31,5 @@
 struct pipe_screen *
 vc4_drm_screen_create(int fd)
 {
-	return vc4_screen_create(dup(fd));
+	return vc4_screen_create(fcntl(fd, F_DUPFD_CLOEXEC, 3));
 }

src/gallium/winsys/virgl/drm/virgl_drm_winsys.c

@@ -864,7 +864,7 @@ virgl_drm_screen_create(int fd)
       virgl_screen(pscreen)->refcnt++;
    } else {
       struct virgl_winsys *vws;
-      int dup_fd = dup(fd);
+      int dup_fd = fcntl(fd, F_DUPFD_CLOEXEC, 3);
 
       vws = virgl_drm_winsys_create(dup_fd);