[BusyBox] added command "mesg" to busybox

[Da Chen]

Hi,
    I added linux command "mesg" to busybox to enable or disable
your terminal to receive message. Here is the patch and file mesg.c.
mesg.c is in directory "shellutils". I will add command "write" next
time.

    Please review it. Thanks.

Da Chen
-------------- next part --------------
/* vi: set sw=4 ts=4: */
/*
 * Mini mesg -- control write access to terminal.
 *
 * Ported to busybox by Da Chen <dchen at ayrnetworks.com>
 * Copyright (c) 2002 AYR Networks, Inc.
 *
 * This is a free document; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation:
 *    http://www.gnu.org/copyleft/gpl.html
 *
 * Modified Fri Mar 10 20:27:19 1995, faith at cs.unc.edu, for Linux
 * Modified Mon Jul  1 18:14:10 1996, janl at ifi.uio.no, writing to stdout
 *      as suggested by Michael Meskes <meskes at Informatik.RWTH-Aachen.DE>
 *
 * 1999-02-22 Arkadiusz Mi?kiewicz <misiek at pld.ORG.PL>
 * - added Native Language Support
 *
 * Copyright (c) 1987, 1993
 *      The Regents of the University of California.  All rights reserved.
 * (c) UNIX System Laboratories, Inc.
 * All or some portions of this file are derived from material licensed
 * to the University of California by American Telephone and Telegraph
 * Co. or Unix System Laboratories, Inc. and are reproduced herein with
 * the permission of UNIX System Laboratories, Inc.
 */

#include <sys/types.h>
#include <sys/stat.h>
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "busybox.h"

extern int mesg_main(int argc, char *argv[])
{
        struct stat sb;
        char *tty;
        int ch;

        while ((ch = getopt(argc, argv, "")) != EOF)
                switch (ch) {
                case '?':
                default: show_usage();
                }
        argc -= optind;
        argv += optind;

        if ((tty = ttyname(STDERR_FILENO)) == NULL)
             perror_msg("ttyname");
        if (stat(tty, &sb) < 0)
             perror_msg("%s", tty);

        if (*argv == NULL) {
                if (sb.st_mode & (S_IWGRP | S_IWOTH)) {
                    fprintf(stdout, "is y\n");
                    exit (1); 
                } else {
                    fprintf(stdout,"is n\n");
                    exit (2);
                }
                
        }
        switch (*argv[0]) {
        case 'y':
#ifdef USE_TTY_GROUP
                if (chmod(tty, sb.st_mode | S_IWGRP) < 0)
                    perror_msg("%s", tty);
#else
                if (chmod(tty, sb.st_mode | S_IWGRP | S_IWOTH) < 0)
                    perror_msg("%s", tty);
#endif
                exit(0);
        case 'n':
                if (chmod(tty, sb.st_mode & ~(S_IWGRP|S_IWOTH)) < 0)
                    perror_msg("%s", tty);
                exit(1);
        default: show_usage();
        }

        return (0);
}
-------------- next part --------------
? ID
? mesg.patch
? shellutils/mesg.c
Index: include/applets.h
===================================================================
RCS file: /var/cvs/busybox/include/applets.h,v
retrieving revision 1.56
diff -b -w -u -r1.56 applets.h
--- include/applets.h	26 Apr 2002 23:53:08 -0000	1.56
+++ include/applets.h	30 Apr 2002 18:44:12 -0000
@@ -284,6 +284,9 @@
 #ifdef CONFIG_MD5SUM
 	APPLET(md5sum, md5sum_main, _BB_DIR_USR_BIN)
 #endif
+#ifdef CONFIG_MESG
+	APPLET(mesg, mesg_main, _BB_DIR_BIN)
+#endif
 #ifdef CONFIG_MKDIR
 	APPLET(mkdir, mkdir_main, _BB_DIR_BIN)
 #endif
Index: include/usage.h
===================================================================
RCS file: /var/cvs/busybox/include/usage.h,v
retrieving revision 1.90
diff -b -w -u -r1.90 usage.h
--- include/usage.h	27 Apr 2002 01:31:43 -0000	1.90
+++ include/usage.h	30 Apr 2002 18:44:13 -0000
@@ -1114,6 +1114,11 @@
 	"busybox: OK\n" \
 	"^D\n"
 
+#define mesg_trivial_usage \
+	"[y | n]"
+#define mesg_full_usage \
+	"\tcontrol write access to your terminal"
+
 #define mkdir_trivial_usage \
 	"[OPTION] DIRECTORY..."
 #define mkdir_full_usage \
Index: shellutils/Makefile.in
===================================================================
RCS file: /var/cvs/busybox/shellutils/Makefile.in,v
retrieving revision 1.2
diff -b -w -u -r1.2 Makefile.in
--- shellutils/Makefile.in	26 Apr 2002 23:53:09 -0000	1.2
+++ shellutils/Makefile.in	30 Apr 2002 18:44:13 -0000
@@ -36,6 +36,7 @@
 SHELLUTILS-$(CONFIG_HOSTID)		+= hostid.o
 SHELLUTILS-$(CONFIG_ID)			+= id.o
 SHELLUTILS-$(CONFIG_LOGNAME)		+= logname.o
+SHELLUTILS-$(CONFIG_MESG)		+= mesg.o
 SHELLUTILS-$(CONFIG_PRINTF)		+= printf.o
 SHELLUTILS-$(CONFIG_PWD)		+= pwd.o
 SHELLUTILS-$(CONFIG_SLEEP)		+= sleep.o
Index: shellutils/config.in
===================================================================
RCS file: /var/cvs/busybox/shellutils/config.in,v
retrieving revision 1.5
diff -b -w -u -r1.5 config.in
--- shellutils/config.in	26 Apr 2002 23:53:10 -0000	1.5
+++ shellutils/config.in	30 Apr 2002 18:44:13 -0000
@@ -19,6 +19,7 @@
 bool 'hostid'		CONFIG_HOSTID
 bool 'id'		CONFIG_ID
 bool 'logname'		CONFIG_LOGNAME
+bool 'mesg'		CONFIG_MESG
 bool 'printf'		CONFIG_PRINTF
 bool 'pwd'		CONFIG_PWD
 bool 'sleep'		CONFIG_SLEEP