diff options
Diffstat (limited to 'tools/testing/selftests/damon/huge_count_read_write.c')
-rw-r--r-- | tools/testing/selftests/damon/huge_count_read_write.c | 48 |
1 files changed, 48 insertions, 0 deletions
diff --git a/tools/testing/selftests/damon/huge_count_read_write.c b/tools/testing/selftests/damon/huge_count_read_write.c new file mode 100644 index 000000000000..a6fe0689f88d --- /dev/null +++ b/tools/testing/selftests/damon/huge_count_read_write.c @@ -0,0 +1,48 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Author: SeongJae Park <sj@kernel.org> + */ + +#include <fcntl.h> +#include <stdlib.h> +#include <unistd.h> +#include <stdio.h> + +#pragma GCC diagnostic push +#if __GNUC__ >= 11 && __GNUC_MINOR__ >= 1 +/* Ignore read(2) overflow and write(2) overread compile warnings */ +#pragma GCC diagnostic ignored "-Wstringop-overread" +#pragma GCC diagnostic ignored "-Wstringop-overflow" +#endif + +void write_read_with_huge_count(char *file) +{ + int filedesc = open(file, O_RDWR); + char buf[25]; + int ret; + + printf("%s %s\n", __func__, file); + if (filedesc < 0) { + fprintf(stderr, "failed opening %s\n", file); + exit(1); + } + + write(filedesc, "", 0xfffffffful); + perror("after write: "); + ret = read(filedesc, buf, 0xfffffffful); + perror("after read: "); + close(filedesc); +} + +#pragma GCC diagnostic pop + +int main(int argc, char *argv[]) +{ + if (argc != 2) { + fprintf(stderr, "Usage: %s <file>\n", argv[0]); + exit(1); + } + write_read_with_huge_count(argv[1]); + + return 0; +} |