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authorJohn Crispin <blogic@openwrt.org>2013-03-08 23:45:21 +0100
committerJohn Crispin <blogic@openwrt.org>2013-03-13 18:58:13 +0100
commit5baf6ea0abf218c6743a59cfc46a00318772f8fc (patch)
tree41408278c7761d5ce2c50693927cee688151abd0
parentf39921669076a5f37c05737452d74017dbaa0e23 (diff)
downloadunitd-5baf6ea0abf218c6743a59cfc46a00318772f8fc.tar
unitd-5baf6ea0abf218c6743a59cfc46a00318772f8fc.zip
add askfirst tool
-rw-r--r--askfirst.c59
1 files changed, 59 insertions, 0 deletions
diff --git a/askfirst.c b/askfirst.c
new file mode 100644
index 0000000..2f948f8
--- /dev/null
+++ b/askfirst.c
@@ -0,0 +1,59 @@
+/*
+ * Copyright (C) 2013 Felix Fietkau <nbd@openwrt.org>
+ * Copyright (C) 2013 John Crispin <blogic@openwrt.org>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Lesser General Public License version 2.1
+ * as published by the Free Software Foundation
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <sys/types.h>
+#include <sys/stat.h>
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+
+static int redirect_output(const char *dev)
+{
+ pid_t p = setsid();
+ int fd;
+
+ chdir("/dev");
+ fd = open(dev, O_RDWR);
+ chdir("/");
+
+ if (fd < 0)
+ return -1;
+
+ close(STDIN_FILENO);
+ close(STDOUT_FILENO);
+ close(STDERR_FILENO);
+
+ dup2(fd, STDIN_FILENO);
+ dup2(fd, STDOUT_FILENO);
+ dup2(fd, STDERR_FILENO);
+ tcsetpgrp(fd, p);
+ close(fd);
+
+ return 0;
+}
+
+int main(int argc, char **argv)
+{
+ if (redirect_output(argv[1]))
+ fprintf(stderr, "%s: Failed to open %s\n", argv[0], argv[1]);
+
+ printf("Please press Enter to activate this console.\n");
+ while (getchar() != 0xA)
+ ;
+ execvp(argv[2], &argv[2]);
+ printf("%s: Failed to execute %s\n", argv[0], argv[2]);
+
+ return -1;
+}