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screendump: replace FILE with QIOChannel and fix close()/qemu_close() 

The file opened for ppm_save() may be a /dev/fdset, in which case a
dup fd is added to the fdset. It should be removed by calling
qemu_close(), instead of the implicit close() on fclose().

I don't see a convenient way to solve that with stdio streams, so I
switched the code to QIOChannel which uses qemu_close().

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Marc-André Lureau 2019-11-08 17:31:43 +04:00
parent f60a1cdca5
commit c5f2bce5ee
1 changed files with 16 additions and 21 deletions
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37
ui/console.c
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@ -33,6 +33,7 @@
#include "chardev/char-fe.h"
#include "trace.h"
#include "exec/memory.h"
#include "io/channel-file.h"
#define DEFAULT_BACKSCROLL 512
#define CONSOLE_CURSOR_PERIOD 500
@ -313,36 +314,30 @@ static bool ppm_save(int fd, DisplaySurface *ds, Error **errp)
{
int width = pixman_image_get_width(ds->image);
int height = pixman_image_get_height(ds->image);
FILE *f;
g_autoptr(Object) ioc = OBJECT(qio_channel_file_new_fd(fd));
g_autofree char *header = NULL;
g_autoptr(pixman_image_t) linebuf = NULL;
int y;
int ret;
pixman_image_t *linebuf;
bool success = false;
trace_ppm_save(fd, ds);
f = fdopen(fd, "wb");
ret = fprintf(f, "P6\n%d %d\n%d\n", width, height, 255);
if (ret < 0) {
linebuf = NULL;
goto end;
header = g_strdup_printf("P6\n%d %d\n%d\n", width, height, 255);
if (qio_channel_write_all(QIO_CHANNEL(ioc),
header, strlen(header), errp) < 0) {
return false;
}
linebuf = qemu_pixman_linebuf_create(PIXMAN_BE_r8g8b8, width);
for (y = 0; y < height; y++) {
qemu_pixman_linebuf_fill(linebuf, ds->image, width, 0, y);
clearerr(f);
ret = fwrite(pixman_image_get_data(linebuf), 1,
pixman_image_get_stride(linebuf), f);
(void)ret;
success = !ferror(f);
if (qio_channel_write_all(QIO_CHANNEL(ioc),
(char *)pixman_image_get_data(linebuf),
pixman_image_get_stride(linebuf), errp) < 0) {
return false;
}
}
end:
if (!success) {
error_setg(errp, "failed to write to PPM file: %s", strerror(errno));
}
qemu_pixman_image_unref(linebuf);
fclose(f);
return success;
return true;
}
void qmp_screendump(const char *filename, bool has_device, const char *device,