tools: bpftool: read from stdin when batch file name is "-"

Make bpftool read its command list from standard input when the name if
the input file is a single dash.
Signed-off-by: Quentin Monnet <quentin.monnet@netronome.com>
Acked-by: Jakub Kicinski <jakub.kicinski@netronome.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>

tools/bpf/bpftool/main.c

@@ -195,6 +195,9 @@ static int do_batch(int argc, char **argv)
 	}
 	NEXT_ARG();
 
+	if (!strcmp(*argv, "-"))
+		fp = stdin;
+	else
 		fp = fopen(*argv, "r");
 	if (!fp) {
 		p_err("Can't open file (%s): %s", *argv, strerror(errno));
@@ -284,6 +287,7 @@ static int do_batch(int argc, char **argv)
 		err = 0;
 	}
 err_close:
+	if (fp != stdin)
 		fclose(fp);
 
 	if (json_output)