[T106][ZXW-22]7520V3SCV2.01.01.02P42U09_VEC_V0.8_AP_VEC origin source commit
Change-Id: Ic6e05d89ecd62fc34f82b23dcf306c93764aec4b
diff --git a/ap/app/busybox/src/init/mesg.c b/ap/app/busybox/src/init/mesg.c
new file mode 100644
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--- /dev/null
+++ b/ap/app/busybox/src/init/mesg.c
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+/* vi: set sw=4 ts=4: */
+/*
+ * mesg implementation for busybox
+ *
+ * Copyright (c) 2002 Manuel Novoa III <mjn3@codepoet.org>
+ *
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
+ */
+
+//config:config MESG
+//config: bool "mesg"
+//config: default y
+//config: help
+//config: Mesg controls access to your terminal by others. It is typically
+//config: used to allow or disallow other users to write to your terminal
+//config:
+//config:config FEATURE_MESG_ENABLE_ONLY_GROUP
+//config: bool "Enable writing to tty only by group, not by everybody"
+//config: default y
+//config: depends on MESG
+//config: help
+//config: Usually, ttys are owned by group "tty", and "write" tool is
+//config: setgid to this group. This way, "mesg y" only needs to enable
+//config: "write by owning group" bit in tty mode.
+//config:
+//config: If you set this option to N, "mesg y" will enable writing
+//config: by anybody at all. This is not recommended.
+
+//applet:IF_MESG(APPLET(mesg, BB_DIR_USR_BIN, BB_SUID_DROP))
+
+//kbuild:lib-$(CONFIG_MESG) += mesg.o
+
+//usage:#define mesg_trivial_usage
+//usage: "[y|n]"
+//usage:#define mesg_full_usage "\n\n"
+//usage: "Control write access to your terminal\n"
+//usage: " y Allow write access to your terminal\n"
+//usage: " n Disallow write access to your terminal"
+
+#include "libbb.h"
+
+#if ENABLE_FEATURE_MESG_ENABLE_ONLY_GROUP
+#define S_IWGRP_OR_S_IWOTH S_IWGRP
+#else
+#define S_IWGRP_OR_S_IWOTH (S_IWGRP | S_IWOTH)
+#endif
+
+int mesg_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
+int mesg_main(int argc UNUSED_PARAM, char **argv)
+{
+ struct stat sb;
+ mode_t m;
+ char c = 0;
+
+ argv++;
+
+ if (argv[0]
+ && (argv[1] || ((c = argv[0][0]) != 'y' && c != 'n'))
+ ) {
+ bb_show_usage();
+ }
+
+ if (!isatty(STDIN_FILENO))
+ bb_error_msg_and_die("not a tty");
+
+ xfstat(STDIN_FILENO, &sb, "stderr");
+ if (c == 0) {
+ puts((sb.st_mode & (S_IWGRP|S_IWOTH)) ? "is y" : "is n");
+ return EXIT_SUCCESS;
+ }
+ m = (c == 'y') ? sb.st_mode | S_IWGRP_OR_S_IWOTH
+ : sb.st_mode & ~(S_IWGRP|S_IWOTH);
+ if (fchmod(STDIN_FILENO, m) != 0)
+ bb_perror_nomsg_and_die();
+ return EXIT_SUCCESS;
+}