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authorAndrew Tridgell <tridge@samba.org>2005-07-25 04:03:01 +0000
committerGerald (Jerry) Carter <jerry@samba.org>2007-10-10 13:30:01 -0500
commitf92c000fc903803e1c2817dd407974ec44390593 (patch)
treed807a16484c93d45f463e5c23d1750a1c1ac5a08 /source4/build/tests
parentfc9ffba41332b5755ede3683208ec989d30fdcd0 (diff)
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r8746: replace opendir/readdir/telldir/seekdir/closedir on systems where they
are broken (apparently all BSD systems). This breakage leads to unlink on files in an open directory causing a later seekdir to miss files. The bug happens due to a block boundary bug in the BSD libc implementation of these calls. This replacement code also fixes a severe memory usage problem with telldir that can cause closedir() to take an arbitrary amount of time. I have reported the bug in readdir to Greg Lehey (a FreeBSD maintainer) (This used to be commit e1bf7c4279fbc03a52497d24cea375e75059cba1)
Diffstat (limited to 'source4/build/tests')
-rw-r--r--source4/build/tests/os2_delete.c110
1 files changed, 110 insertions, 0 deletions
diff --git a/source4/build/tests/os2_delete.c b/source4/build/tests/os2_delete.c
new file mode 100644
index 0000000000..dad27e8f2c
--- /dev/null
+++ b/source4/build/tests/os2_delete.c
@@ -0,0 +1,110 @@
+/*
+ test readdir/unlink pattern that OS/2 uses
+ tridge@samba.org July 2005
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include <sys/types.h>
+#include <dirent.h>
+#include <errno.h>
+#include <string.h>
+#include <fcntl.h>
+#ifdef REPLACE_READDIR
+#include "lib/replace/repdir/repdir.h"
+#endif
+
+#define NUM_FILES 700
+#define READDIR_SIZE 100
+#define DELETE_SIZE 4
+
+#define TESTDIR "test.dir"
+
+#define FAILED() (fprintf(stderr, "Failed at %s:%d - %s\n", __FUNCTION__, __LINE__, strerror(errno)), exit(1), 1)
+
+#ifndef MIN
+#define MIN(a,b) ((a)<(b)?(a):(b))
+#endif
+
+static void cleanup(void)
+{
+ /* I'm a lazy bastard */
+ system("rm -rf " TESTDIR);
+ mkdir(TESTDIR, 0700) == 0 || FAILED();
+}
+
+static void create_files()
+{
+ int i;
+ for (i=0;i<NUM_FILES;i++) {
+ char fname[40];
+ sprintf(fname, TESTDIR "/test%u.txt", i);
+ close(open(fname, O_CREAT|O_RDWR, 0600)) == 0 || FAILED();
+ }
+}
+
+static int os2_delete(DIR *d)
+{
+ off_t offsets[READDIR_SIZE];
+ int i, j;
+ struct dirent *de;
+ char names[READDIR_SIZE][30];
+
+ /* scan, remembering offsets */
+ for (i=0, de=readdir(d);
+ de && i < READDIR_SIZE;
+ de=readdir(d), i++) {
+ offsets[i] = telldir(d);
+ strcpy(names[i], de->d_name);
+ }
+
+ if (i == 0) {
+ return 0;
+ }
+
+ /* delete the first few */
+ for (j=0; j<MIN(i, DELETE_SIZE); j++) {
+ char fname[40];
+ sprintf(fname, TESTDIR "/%s", names[j]);
+ unlink(fname) == 0 || FAILED();
+ }
+
+ /* seek to just after the deletion */
+ seekdir(d, offsets[j-1]);
+
+ /* return number deleted */
+ return j;
+}
+
+int main(void)
+{
+ int total_deleted = 0;
+ DIR *d;
+ struct dirent *de;
+
+ cleanup();
+ create_files();
+
+ d = opendir(TESTDIR);
+
+ /* skip past . and .. */
+ de = readdir(d);
+ strcmp(de->d_name, ".") == 0 || FAILED();
+ de = readdir(d);
+ strcmp(de->d_name, "..") == 0 || FAILED();
+
+ while (1) {
+ int n = os2_delete(d);
+ if (n == 0) break;
+ total_deleted += n;
+ }
+ closedir(d);
+
+ printf("Deleted %d files of %d\n", total_deleted, NUM_FILES);
+
+ rmdir(TESTDIR) == 0 || FAILED();
+
+ return 0;
+}