92 lines
2.2 KiB
C
92 lines
2.2 KiB
C
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/* Read an image and check that file handles are being closed on minimise.
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*
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* This will only work on linux: we signal success and do nothing if /dev/proc
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* does not exist.
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*/
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#include <sys/types.h>
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#include <unistd.h>
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#include <vips/vips.h>
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/* Count the number of files in a directory, -1 for directory not found etc.
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*/
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static int
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count_files( const char *dirname )
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{
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GDir *dir;
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int n;
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if( !(dir = g_dir_open( dirname, 0, NULL )) )
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return( -1 );
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for( n = 0; g_dir_read_name( dir ); n++ )
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;
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g_dir_close( dir );
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return( n );
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}
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int
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main( int argc, char **argv )
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{
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VipsImage *image, *x;
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char fd_dir[256];
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int n_files;
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double average;
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if( VIPS_INIT( argv[0] ) )
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vips_error_exit( "unable to start" );
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vips_snprintf( fd_dir, 256, "/proc/%d/fd", getpid() );
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n_files = count_files( fd_dir );
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if( n_files == -1 )
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/* Probably not linux, silent success.
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*/
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return( 0 );
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/* This is usually 4. stdout / stdin / stderr plus one more made for
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* us by glib, I think, doing what I don't know.
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*/
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/* Opening an image should read the header, then close the fd.
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*/
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if( !(image = vips_image_new_from_file( argv[1],
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"access", VIPS_ACCESS_SEQUENTIAL,
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NULL )) )
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vips_error_exit( NULL );
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if( count_files( fd_dir ) != n_files )
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vips_error_exit( "fd not closed after header read" );
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/* We should be able to read a chunk near the top, then have the fd
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* closed again.
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*/
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if( vips_crop( image, &x, 0, 0, image->Xsize, 10, NULL ) ||
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vips_avg( x, &average, NULL ) )
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vips_error_exit( NULL );
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g_object_unref( x );
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if( count_files( fd_dir ) != n_files )
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vips_error_exit( "fd not closed after first read" );
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/* We should be able to read again, a little further down, and have
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* the input restarted and closed again.
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*/
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if( vips_crop( image, &x, 0, 20, image->Xsize, 10, NULL ) ||
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vips_avg( x, &average, NULL ) )
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vips_error_exit( NULL );
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g_object_unref( x );
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if( count_files( fd_dir ) != n_files )
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vips_error_exit( "fd not closed after second read" );
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/* Clean up, and we should still just have three open.
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*/
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g_object_unref( x );
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vips_shutdown();
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if( count_files( fd_dir ) != n_files )
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vips_error_exit( "fd not closed after shutdown" );
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return( 0 );
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}
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