[Qemu-devel] [PATCH v2 4/5] vga: ppm_save(): Return error on failure

[Alon Levy <alevy@redhat.com>]

From: Luiz Capitulino <lcapitulino@redhat.com>

This makes all devices using ppm_save() return an error appropriately
when the screendump command fails.

Based on a code by Anthony Liguori.

Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com>
Signed-off-by: Alon Levy <alevy@redhat.com>
---
 hw/blizzard.c   |    2 +-
 hw/qxl.c        |    2 +-
 hw/vga.c        |    8 +++++---
 hw/vga_int.h    |    3 ++-
 hw/vmware_vga.c |    2 +-
 5 files changed, 10 insertions(+), 7 deletions(-)

diff --git a/hw/blizzard.c b/hw/blizzard.c
index 76df78c..29e5ae6 100644
--- a/hw/blizzard.c
+++ b/hw/blizzard.c
@@ -942,7 +942,7 @@ static void blizzard_screen_dump(void *opaque, const char *filename,
         blizzard_update_display(opaque);
     }
     if (s && ds_get_data(s->state))
-        ppm_save(filename, s->state->surface);
+        ppm_save(filename, s->state->surface, errp);
 }
 
 #define DEPTH 8
diff --git a/hw/qxl.c b/hw/qxl.c
index 27f27f5..aa68612 100644
--- a/hw/qxl.c
+++ b/hw/qxl.c
@@ -1503,7 +1503,7 @@ static void qxl_hw_screen_dump(void *opaque, const char *filename, bool cswitch,
     case QXL_MODE_COMPAT:
     case QXL_MODE_NATIVE:
         qxl_render_update(qxl);
-        ppm_save(filename, qxl->ssd.ds->surface);
+        ppm_save(filename, qxl->ssd.ds->surface, errp);
         break;
     case QXL_MODE_VGA:
         vga->screen_dump(vga, filename, cswitch, errp);
diff --git a/hw/vga.c b/hw/vga.c
index 79c5c38..80e6dca 100644
--- a/hw/vga.c
+++ b/hw/vga.c
@@ -2365,7 +2365,7 @@ void vga_init_vbe(VGACommonState *s, MemoryRegion *system_memory)
 /********************************************************/
 /* vga screen dump */
 
-int ppm_save(const char *filename, struct DisplaySurface *ds)
+int ppm_save(const char *filename, struct DisplaySurface *ds, Error **errp)
 {
     FILE *f;
     uint8_t *d, *d1;
@@ -2377,8 +2377,10 @@ int ppm_save(const char *filename, struct DisplaySurface *ds)
 
     trace_ppm_save(filename, ds);
     f = fopen(filename, "wb");
-    if (!f)
+    if (!f) {
+        error_set_file_open_failed(errp, filename, errno);
         return -1;
+    }
     fprintf(f, "P6\n%d %d\n%d\n",
             ds->width, ds->height, 255);
     linebuf = g_malloc(ds->width * 3);
@@ -2420,5 +2422,5 @@ static void vga_screen_dump(void *opaque, const char *filename, bool cswitch,
         vga_invalidate_display(s);
         vga_hw_update();
     }
-    ppm_save(filename, s->ds->surface);
+    ppm_save(filename, s->ds->surface, errp);
 }
diff --git a/hw/vga_int.h b/hw/vga_int.h
index 7685b2b..63078ba 100644
--- a/hw/vga_int.h
+++ b/hw/vga_int.h
@@ -24,6 +24,7 @@
 
 #include <hw/hw.h>
 #include "memory.h"
+#include "error.h"
 
 #define ST01_V_RETRACE      0x08
 #define ST01_DISP_ENABLE    0x01
@@ -200,7 +201,7 @@ void vga_ioport_write(void *opaque, uint32_t addr, uint32_t val);
 uint32_t vga_mem_readb(VGACommonState *s, target_phys_addr_t addr);
 void vga_mem_writeb(VGACommonState *s, target_phys_addr_t addr, uint32_t val);
 void vga_invalidate_scanlines(VGACommonState *s, int y1, int y2);
-int ppm_save(const char *filename, struct DisplaySurface *ds);
+int ppm_save(const char *filename, struct DisplaySurface *ds, Error **errp);
 
 int vga_ioport_invalid(VGACommonState *s, uint32_t addr);
 void vga_init_vbe(VGACommonState *s, MemoryRegion *address_space);
diff --git a/hw/vmware_vga.c b/hw/vmware_vga.c
index 6868778..0769652 100644
--- a/hw/vmware_vga.c
+++ b/hw/vmware_vga.c
@@ -1016,7 +1016,7 @@ static void vmsvga_screen_dump(void *opaque, const char *filename, bool cswitch,
     if (s->depth == 32) {
         DisplaySurface *ds = qemu_create_displaysurface_from(s->width,
                 s->height, 32, ds_get_linesize(s->vga.ds), s->vga.vram_ptr);
-        ppm_save(filename, ds);
+        ppm_save(filename, ds, errp);
         g_free(ds);
     }
 }
-- 
1.7.9.3