k9core

commit bfd05a231834e67d6bf0732c287769c7c8231569
parent dcf3e2a3e5e43dfabcf16523cfafcf0c9dc5e2fd
Author: aabacchus <ben@bvnf.space>
Date:   Tue, 14 Sep 2021 17:38:39 +0100

shred: write one byte at a time, fsync the changes

Diffstat:
M
src/shred.c
 | 
7
++++++-

1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/src/shred.c b/src/shred.c
@@ -23,10 +23,15 @@ fill_with_zeroes(const char *filename)
 	long int bytes_to_write = stat_struct.st_size;
 
 	for(int i = 0; i < bytes_to_write; i++)
-		if(write(fd, "\0\0\0\0\0", bytes_to_write + 2048) == -1) {
+		if(write(fd, "\0", 1) == -1) {
 			fprintf(stderr, "shred: %s: %s\n", filename, strerror(errno));
 			return 1;
 		}
+	if(fsync(fd) == -1) {
+		fprintf(stderr, "shred: %s: %s\n", filename, strerror(errno));
+		return 1;
+	}
+	close(fd);
 	return 0;
 }