src/lxc/lxc_start.c

   1 /*
   2  * lxc: linux Container library
   3  *
   4  * (C) Copyright IBM Corp. 2007, 2008
   5  *
   6  * Authors:
   7  * Daniel Lezcano <dlezcano at fr.ibm.com>
   8  *
   9  * This library is free software; you can redistribute it and/or
  10  * modify it under the terms of the GNU Lesser General Public
  11  * License as published by the Free Software Foundation; either
  12  * version 2.1 of the License, or (at your option) any later version.
  13  *
  14  * This library is distributed in the hope that it will be useful,
  15  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  17  * Lesser General Public License for more details.
  18  *
  19  * You should have received a copy of the GNU Lesser General Public
  20  * License along with this library; if not, write to the Free Software
  21  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
  22  */
  23 #include <stdio.h>
  24 #include <libgen.h>
  25 #include <unistd.h>
  26 #include <string.h>
  27 #include <termios.h>
  28 #include <errno.h>
  29 #include <signal.h>
  30 #include <sys/param.h>
  31 #include <sys/utsname.h>
  32 #include <sys/types.h>
  33 #include <sys/socket.h>
  34 #include <arpa/inet.h>
  35 #include <netinet/in.h>
  36 #include <net/if.h>
  37
  38 #include <lxc/lxc.h>
  39 #include <lxc/log.h>
  40 #include "arguments.h"
  41
  42 lxc_log_define(lxc_start, lxc);
  43
  44 static const struct option my_longopts[] = {
  45         LXC_COMMON_OPTIONS
  46 };
  47
  48 static struct lxc_arguments my_args = {
  49         .progname = "lxc-start",
  50         .help     = "\
  51 --name=NAME -- COMMAND\n\
  52 \n\
  53 lxc-start start COMMAND in specified container NAME\n\
  54 \n\
  55 Options :\n\
  56   -n, --name=NAME      NAME for name of the container",
  57         .options  = my_longopts,
  58         .parser   = NULL,
  59         .checker  = NULL,
  60 };
  61
  62 static int save_tty(struct termios *tios)
  63 {
  64         if (!isatty(0))
  65                 return 0;
  66
  67         if (tcgetattr(0, tios))
  68                 WARN("failed to get current terminal settings : %s",
  69                      strerror(errno));
  70
  71         return 0;
  72 }
  73
  74 static int restore_tty(struct termios *tios)
  75 {
  76         struct termios current_tios;
  77         void (*oldhandler)(int);
  78         int ret;
  79
  80         if (!isatty(0))
  81                 return 0;
  82
  83         if (tcgetattr(0, &current_tios)) {
  84                 ERROR("failed to get current terminal settings : %s",
  85                       strerror(errno));
  86                 return -1;
  87         }
  88
  89         if (!memcmp(tios, &current_tios, sizeof(*tios)))
  90                 return 0;
  91
  92
  93         oldhandler = signal(SIGTTOU, SIG_IGN);
  94         ret = tcsetattr(0, TCSADRAIN, tios);
  95         if (ret)
  96                 ERROR("failed to restore terminal attributes");
  97         signal(SIGTTOU, oldhandler);
  98
  99         return ret;
 100 }
 101
 102 int main(int argc, char *argv[])
 103 {
 104         char *const *args;
 105         int err = -1;
 106         struct termios tios;
 107
 108         char *const default_args[] = {
 109                 "/sbin/init",
 110                 '\0',
 111         };
 112
 113         if (lxc_arguments_parse(&my_args, argc, argv))
 114                 return err;
 115
 116         if (!my_args.argc)
 117                 args = default_args;
 118         else
 119                 args = my_args.argv;
 120
 121         if (lxc_log_init(my_args.log_file, my_args.log_priority,
 122                          my_args.progname, my_args.quiet))
 123                 return err;
 124
 125         save_tty(&tios);
 126
 127         err = lxc_start(my_args.name, args);
 128
 129         restore_tty(&tios);
 130
 131         return err;
 132 }
 133