On Sun, 4 Jul 2021, RVP wrote:

+               n = fwrite(p, 1, len, fp);
+               if (n == 0) {
+                       if (errno == EINTR)
+                               clearerr(fp);
+                       else
+                               return 0;
+               }

Small correction: that clearerr() is probably unnecessary--please omit.

-RVP

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