renderer: consolidate on errno return values

src/virgl_egl_context.c

@@ -33,6 +33,7 @@
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
+#include <errno.h>
 #include <stdbool.h>
 #include <epoxy/egl.h>
 #include <gbm.h>
@@ -266,7 +267,7 @@ int virgl_egl_get_fd_for_texture(struct virgl_egl *ve, uint32_t tex_id, int *fd)
    image = eglCreateImageKHR(ve->egl_display, eglGetCurrentContext(), EGL_GL_TEXTURE_2D_KHR, (EGLClientBuffer)(unsigned long)tex_id, NULL);
 
    if (!image)
-      return -1;
+      return EINVAL;
 
    if (ve->have_mesa_dma_buf_img_export) {
 #ifdef EGL_MESA_image_dma_buf_export
@@ -275,7 +276,7 @@ int virgl_egl_get_fd_for_texture(struct virgl_egl *ve, uint32_t tex_id, int *fd)
 				     fd,
 				     &stride);
 #else
-        return -1;
+        return EINVAL;
 #endif
    } else {
 #ifdef EGL_MESA_drm_image
@@ -287,15 +288,15 @@ int virgl_egl_get_fd_for_texture(struct virgl_egl *ve, uint32_t tex_id, int *fd)
                                  &stride);
 
        if (!b)
-           return -1;
+           return EINVAL;
 
        fprintf(stderr,"image exported %d %d\n", handle, stride);
 
        r = drmPrimeHandleToFD(ve->fd, handle, DRM_CLOEXEC, fd);
        if (r < 0)
-           return -1;
+           return EINVAL;
 #else
-       return -1;
+       return EINVAL;
 #endif
    }
    return 0;

src/vrend_renderer.c

@@ -3290,7 +3290,7 @@ int vrend_renderer_resource_attach_iov(int res_handle, struct iovec *iov,
    
    res = vrend_resource_lookup(res_handle, 0);
    if (!res)
-      return -1;
+      return EINVAL;
 
    /* work out size and max resource size */
    res->iov = iov;
@@ -4656,7 +4656,7 @@ int vrend_renderer_create_fence(int client_fence_id, uint32_t ctx_id)
 
    fence = malloc(sizeof(struct vrend_fence));
    if (!fence)
-      return -1;
+       return ENOMEM;
 
    fence->ctx_id = ctx_id;
    fence->fence_id = client_fence_id;