+
+static int
+try_file (char *tmpl, void *flags)
+{
+ int *openflags = flags;
+ return __open (tmpl,
+ (*openflags & ~O_ACCMODE)
+ | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR);
+}
+
+static int
+try_dir (char *tmpl, void *flags _GL_UNUSED)
+{
+ return __mkdir (tmpl, S_IRUSR | S_IWUSR | S_IXUSR);
+}
+
+static int
+try_nocreate (char *tmpl, void *flags _GL_UNUSED)
+{
+ struct_stat64 st;
+
+ if (__lxstat64 (_STAT_VER, tmpl, &st) == 0)
+ __set_errno (EEXIST);
+ return errno == ENOENT ? 0 : -1;
+}
+
+/* Generate a temporary file name based on TMPL. TMPL must match the
+ rules for mk[s]temp (i.e. end in "XXXXXX", possibly with a suffix).
+ The name constructed does not exist at the time of the call to
+ __gen_tempname. TMPL is overwritten with the result.
+
+ KIND may be one of:
+ __GT_NOCREATE: simply verify that the name does not exist
+ at the time of the call.
+ __GT_FILE: create the file using open(O_CREAT|O_EXCL)
+ and return a read-write fd. The file is mode 0600.
+ __GT_DIR: create a directory, which will be mode 0700.
+
+ We use a clever algorithm to get hard-to-predict names. */
+int
+__gen_tempname (char *tmpl, int suffixlen, int flags, int kind)
+{
+ int (*tryfunc) (char *, void *);
+
+ switch (kind)
+ {
+ case __GT_FILE:
+ tryfunc = try_file;
+ break;
+
+ case __GT_DIR:
+ tryfunc = try_dir;
+ break;
+
+ case __GT_NOCREATE:
+ tryfunc = try_nocreate;
+ break;
+
+ default:
+ assert (! "invalid KIND in __gen_tempname");
+ abort ();
+ }
+ return __try_tempname (tmpl, suffixlen, &flags, tryfunc);
+}