summaryrefslogtreecommitdiffstats
path: root/src/util/sane_rename.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/util/sane_rename.c')
-rw-r--r--src/util/sane_rename.c69
1 files changed, 69 insertions, 0 deletions
diff --git a/src/util/sane_rename.c b/src/util/sane_rename.c
new file mode 100644
index 0000000..4c55160
--- /dev/null
+++ b/src/util/sane_rename.c
@@ -0,0 +1,69 @@
+/*++
+/* NAME
+/* sane_rename 3
+/* SUMMARY
+/* sanitize rename() error returns
+/* SYNOPSIS
+/* #include <sane_fsops.h>
+/*
+/* int sane_rename(old, new)
+/* const char *from;
+/* const char *to;
+/* DESCRIPTION
+/* sane_rename() implements the rename(2) system call, and works
+/* around some errors that are possible with NFS file systems.
+/* LICENSE
+/* .ad
+/* .fi
+/* The Secure Mailer license must be distributed with this software.
+/* AUTHOR(S)
+/* Wietse Venema
+/* IBM T.J. Watson Research
+/* P.O. Box 704
+/* Yorktown Heights, NY 10598, USA
+/*--*/
+
+/* System library. */
+
+#include "sys_defs.h"
+#include <sys/stat.h>
+#include <errno.h>
+#include <stdio.h> /* rename(2) syscall in stdio.h? */
+
+/* Utility library. */
+
+#include "msg.h"
+#include "sane_fsops.h"
+#include "warn_stat.h"
+
+/* sane_rename - sanitize rename() error returns */
+
+int sane_rename(const char *from, const char *to)
+{
+ const char *myname = "sane_rename";
+ int saved_errno;
+ struct stat st;
+
+ /*
+ * Normal case: rename() succeeds.
+ */
+ if (rename(from, to) >= 0)
+ return (0);
+
+ /*
+ * Woops. Save errno, and see if the error is an NFS artefact. If it is,
+ * pretend the error never happened.
+ */
+ saved_errno = errno;
+ if (stat(from, &st) < 0 && stat(to, &st) >= 0) {
+ msg_info("%s(%s,%s): worked around spurious NFS error",
+ myname, from, to);
+ return (0);
+ }
+
+ /*
+ * Nope, it didn't. Restore errno and report the error.
+ */
+ errno = saved_errno;
+ return (-1);
+}