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/* Read an image and check that file handles are being closed on minimise.
*
* This will only work on linux: we signal success and do nothing if
* /proc/self/fd does not exist.
*/
#include <stdio.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif /*HAVE_UNISTD_H*/
#define _GNU_SOURCE
#include <stdlib.h>
#include <vips/vips.h>
/**
* get_open_files:
*
* Get a list of open files for this process.
*
* Returns (transfer full) (nullable): a new #GSList, or %NULL
*/
static GSList *
get_open_files()
{
#ifdef G_OS_WIN32
/* realpath() and /proc/self/fd is not available on Windows.
*/
return NULL;
#else
GSList *list = NULL;
GDir *dir;
const char *name;
if (!(dir = g_dir_open("/proc/self/fd", 0, NULL)))
return NULL;
while ((name = g_dir_read_name(dir))) {
char *fullname = g_build_filename("/proc/self/fd", name, NULL);
list = g_slist_prepend(list, realpath(fullname, NULL));
g_free(fullname);
}
g_dir_close(dir);
return list;
#endif
}
/**
* fd_check:
* @stage: the originating stage for the error message
* @fds: a #GSList of file descriptors to check against
*
* Check for a leak by comparing the currently open files for this
* process with the file descriptors in @fds. If there's a leak,
* print an error message and return %FALSE.
*
* See also: get_open_files().
*
* Returns: %TRUE if there are no leaks; %FALSE otherwise
*/
static gboolean
fd_check(const char *stage, GSList *fds)
{
GSList *unique_list = NULL, *list, *iter;
list = get_open_files();
for (iter = list; iter; iter = iter->next)
if (!g_slist_find_custom(fds, iter->data,
(GCompareFunc) g_strcmp0))
unique_list = g_slist_prepend(unique_list, iter->data);
if (unique_list == NULL) {
g_slist_free_full(list, g_free);
return TRUE;
}
fprintf(stderr, "%s: file descriptors not closed after %s:\n",
vips_get_prgname(), stage);
for (iter = unique_list; iter; iter = iter->next)
fprintf(stderr, "%s\n", (char *) iter->data);
g_slist_free(unique_list);
g_slist_free_full(list, g_free);
return FALSE;
}
int
main(int argc, char **argv)
{
VipsSource *source;
VipsImage *image, *x;
GSList *list;
double average;
if (VIPS_INIT(argv[0]))
vips_error_exit("unable to start");
if (argc != 2)
vips_error_exit("usage: %s test-image", argv[0]);
list = get_open_files();
if (list == NULL)
/* Probably not *nix, skip test with return code 77.
*/
return 77;
/* This is usually a list of 4 files. stdout / stdin / stderr plus one
* more made for us by glib, I think, doing what I don't know.
*/
/* Opening an image should read the header, then close the fd.
*/
printf("** rand open ..\n");
if (!(source = vips_source_new_from_file(argv[1])))
goto error;
if (!(image = vips_image_new_from_source(source, "",
"access", VIPS_ACCESS_RANDOM,
NULL)))
goto error;
if (!fd_check("header read", list))
goto error;
/* We should be able to read a chunk near the top, then have the fd
* closed again.
*/
printf("** crop1, avg ..\n");
if (vips_crop(image, &x, 0, 0, image->Xsize, 10, NULL) ||
vips_avg(x, &average, NULL))
goto error;
g_object_unref(x);
if (!fd_check("first read", list))
goto error;
/* We should be able to read again, a little further down, and have
* the input restarted and closed again.
*/
printf("** crop2, avg ..\n");
if (vips_crop(image, &x, 0, 20, image->Xsize, 10, NULL) ||
vips_avg(x, &average, NULL))
goto error;
g_object_unref(x);
if (!fd_check("second read", list))
goto error;
/* Clean up, and we should still just have three open.
*/
printf("** unref ..\n");
g_object_unref(image);
g_object_unref(source);
printf("** shutdown ..\n");
vips_shutdown();
if (!fd_check("shutdown", list))
goto error;
g_slist_free_full(list, g_free);
return 0;
error:
g_slist_free_full(list, g_free);
return 1;
}
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