X-Git-Url: http://www.aleph1.co.uk/gitweb/?p=yaffs2.git;a=blobdiff_plain;f=linux-tests%2Fwritebigsparse.c;fp=linux-tests%2Fwritebigsparse.c;h=0d701285d4356bd794877927437f6cc1371a6b50;hp=0000000000000000000000000000000000000000;hb=20de150d680c2a84c4a2e0d5f0f354274c7ff9ab;hpb=b4d93e23d5d94ff4de6c5d1f420153661fc6a0b3;ds=sidebyside

diff --git a/linux-tests/writebigsparse.c b/linux-tests/writebigsparse.c
new file mode 100644
index 0000000..0d70128
--- /dev/null
+++ b/linux-tests/writebigsparse.c
@@ -0,0 +1,80 @@
+#define _LARGEFILE64_SOURCE
+#include<stdio.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+
+int handle;
+
+#define N_WRITES 8000
+#define STRIDE	 1000
+
+#define BUFFER_N 2000
+unsigned  buffer[BUFFER_N];
+
+
+void set_buffer(int n)
+{
+	int i;
+	for(i = 0; i < BUFFER_N; i++)
+		buffer[i] = i + n;
+}
+
+void write_big_sparse_file(int h)
+{
+	int i;
+	off64_t offset = 0;
+	off64_t pos;
+	int n = sizeof(buffer);
+	int wrote;
+	
+	for(i = 0; i < 4000; i++) {
+		set_buffer(i);
+		pos = lseek64(h, offset, SEEK_SET);
+		if(pos != offset) {
+			printf("mismatched seek pos %lld offset %lld\n",
+				pos, offset);
+			exit(1);
+		}
+		wrote = write(h, buffer, n);
+		
+		if(wrote != n) {
+			printf("mismatched write wrote %d n %d\n", wrote, n);
+			exit(1);
+		}
+		
+		offset += (STRIDE * sizeof(buffer));
+	}
+}
+
+
+
+
+void verify_big_sparse_file(int h)
+{
+}
+
+int main(int argc, char *argv[])
+{
+
+	if(argc < 2) {
+		printf("Gimme a file name!\n");
+		exit(1);
+	}
+	
+	handle = open(argv[1], O_CREAT | O_RDWR | O_TRUNC, S_IREAD | S_IWRITE);
+	
+	if(handle < 0) {
+		perror("opening file");
+		exit(1);
+	}
+	
+	write_big_sparse_file(handle);
+	system("sudo echo 3 > /proc/sys/vm/drop_caches");
+	verify_big_sparse_file(handle);
+	
+	printf("Job done\n");
+	return 0;
+}