update

tests/results/manual/2026-08-08T1800Z-namei/readdir_probe.c

@@ -0,0 +1,71 @@
+#include <sys/types.h>
+#include <sys/dirent.h>
+
+#include <dirent.h>
+#include <err.h>
+#include <fcntl.h>
+#include <inttypes.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+
+int
+main(int argc, char **argv)
+{
+	struct dirent *entry;
+	off_t base, before, start;
+	char *buffer;
+	char *end;
+	size_t buffer_size;
+	ssize_t bytes;
+	int calls, fd;
+
+	if (argc < 2 || argc > 5)
+		errx(2, "usage: %s directory [offset [buffer-size [calls]]]",
+		    argv[0]);
+	start = argc >= 3 ? strtoll(argv[2], NULL, 0) : 0;
+	buffer_size = argc >= 4 ? strtoul(argv[3], NULL, 0) : 128;
+	calls = argc >= 5 ? strtol(argv[4], NULL, 0) : 32;
+	if (buffer_size < 32 || calls < 1)
+		errx(2, "invalid buffer size or call count");
+
+	fd = open(argv[1], O_RDONLY | O_DIRECTORY);
+	if (fd < 0)
+		err(1, "open %s", argv[1]);
+	if (lseek(fd, start, SEEK_SET) < 0)
+		err(1, "lseek %jd", (intmax_t)start);
+	buffer = malloc(buffer_size);
+	if (buffer == NULL)
+		err(1, "malloc");
+
+	for (int call = 0; call < calls; call++) {
+		before = lseek(fd, 0, SEEK_CUR);
+		if (before < 0)
+			err(1, "lseek current");
+		base = -1;
+		bytes = getdirentries(fd, buffer, buffer_size, &base);
+		if (bytes < 0)
+			err(1, "getdirentries");
+		printf("call=%d before=%jd after=%jd base=%jd bytes=%zd\n",
+		    call, (intmax_t)before,
+		    (intmax_t)lseek(fd, 0, SEEK_CUR), (intmax_t)base, bytes);
+		if (bytes == 0)
+			break;
+		end = buffer + bytes;
+		for (entry = (struct dirent *)buffer;
+		    (char *)entry < end;
+		    entry = (struct dirent *)((char *)entry + entry->d_reclen)) {
+			if (entry->d_reclen == 0 ||
+			    (char *)entry + entry->d_reclen > end)
+				errx(1, "invalid dirent record");
+			printf("  off=%jd ino=%ju reclen=%u type=%u name=%.*s\n",
+			    (intmax_t)entry->d_off, (uintmax_t)entry->d_fileno,
+			    entry->d_reclen, entry->d_type, entry->d_namlen,
+			    entry->d_name);
+		}
+	}
+
+	free(buffer);
+	close(fd);
+	return (0);
+}