libvips/test/test_descriptors.c

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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 /dev/proc
* does not exist.
*/
#include <sys/types.h>
#include <unistd.h>
#include <vips/vips.h>
/* Count the number of files in a directory, -1 for directory not found etc.
*/
static int
count_files( const char *dirname )
{
GDir *dir;
int n;
if( !(dir = g_dir_open( dirname, 0, NULL )) )
return( -1 );
for( n = 0; g_dir_read_name( dir ); n++ )
;
g_dir_close( dir );
return( n );
}
int
main( int argc, char **argv )
{
VipsStreami *streami;
VipsImage *image, *x;
char fd_dir[256];
int n_files;
double average;
if( VIPS_INIT( argv[0] ) )
vips_error_exit( "unable to start" );
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if( argc != 2 )
vips_error_exit( "usage: %s test-image", argv[0] );
vips_snprintf( fd_dir, 256, "/proc/%d/fd", getpid() );
n_files = count_files( fd_dir );
if( n_files == -1 )
/* Probably not linux, silent success.
*/
return( 0 );
/* This is usually 4. 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( "** seq open ..\n" );
if( !(streami = vips_streami_new_from_filename( argv[1] )) )
vips_error_exit( NULL );
if( !(image = vips_image_new_from_stream( streami, "",
"access", VIPS_ACCESS_SEQUENTIAL,
NULL )) )
vips_error_exit( NULL );
if( count_files( fd_dir ) != n_files )
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vips_error_exit( "%s: fd not closed after header read",
argv[1] );
/* 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 ) )
vips_error_exit( NULL );
g_object_unref( x );
if( count_files( fd_dir ) != n_files )
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vips_error_exit( "%s: fd not closed after first read",
argv[1] );
/* 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 ) )
vips_error_exit( NULL );
g_object_unref( x );
if( count_files( fd_dir ) != n_files )
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vips_error_exit( "%s: fd not closed after second read",
argv[1] );
/* Clean up, and we should still just have three open.
*/
printf( "** unref ..\n" );
g_object_unref( image );
g_object_unref( streami );
printf( "** shutdown ..\n" );
vips_shutdown();
if( count_files( fd_dir ) != n_files )
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vips_error_exit( "%s: fd not closed after shutdown",
argv[1] );
return( 0 );
}