+/* If the "-log file" command-line option has been specified,
+ open the file for append, and redirect stdout/stderr there.
+ This is called very early, before initialize_stderr().
+ */
+void
+stderr_log_file (saver_info *si)
+{
+ int stdout_fd = 1;
+ int stderr_fd = 2;
+ const char *filename = get_string_resource (si->dpy, "logFile", "LogFile");
+ int fd;
+
+ if (!filename || !*filename) return;
+
+ fd = open (filename, O_WRONLY | O_APPEND | O_CREAT, 0666);
+
+ if (fd < 0)
+ {
+ char buf[255];
+ FAIL:
+ sprintf (buf, "%.100s: %.100s", blurb(), filename);
+ perror (buf);
+ fflush (stderr);
+ fflush (stdout);
+ exit (1);
+ }
+
+ fprintf (stderr, "%s: logging to file %s\n", blurb(), filename);
+
+ if (dup2 (fd, stdout_fd) < 0) goto FAIL;
+ if (dup2 (fd, stderr_fd) < 0) goto FAIL;
+
+ fprintf (stderr, "\n\n"
+ "##########################################################################\n"
+ "%s: logging to \"%s\" at %s\n"
+ "##########################################################################\n"
+ "\n",
+ blurb(), filename, timestring());
+}
+
+