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/* Copyright © 2006-2013 Roger Leigh <rleigh@debian.org>
*
* schroot is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* schroot 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.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see
* <http://www.gnu.org/licenses/>.
*
*********************************************************************/
#include <config.h>
#include <sbuild/ctty.h>
#include <cerrno>
#include <cstring>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
namespace sbuild
{
namespace
{
/**
* Set close-on-exec flag. An error will be thrown on failure.
*
* @param fd the file descriptor to set.
*/
void
set_cloexec (int fd)
{
int flags = fcntl(fd, F_GETFD);
flags |= FD_CLOEXEC;
if (fcntl(fd, F_SETFD, flags) < 0)
throw ctty_error(CTTY_CLOEXEC, strerror(errno));
}
/**
* Open the controlling terminal and return its file descriptor.
*
* @returns the CTTY fd, or -1 on failure.
*/
int
open_ctty ()
{
int ctty = open("/dev/tty", O_RDWR|O_NOCTTY);
if (ctty >= 0)
{
set_cloexec(ctty);
}
else
{
ctty = -1;
}
return ctty;
}
}
template<>
error<ctty_error_code>::map_type
error<ctty_error_code>::error_strings =
{
{sbuild::CTTY_CLOEXEC, N_("The controlling terminal close-on-execute flag could not be set")},
{sbuild::CTTY_DUP, N_("The controlling terminal file descriptor could not be duplicated")}
};
const int CTTY_FILENO(open_ctty());
namespace
{
/**
* Get the file descriptor for cttybuf. An error will be thrown on
* failure.
*
* @returns the CTTY_FILENO file descriptor if there is a CTTY, or a
* duplicated file descriptor for stdin otherwise.
*/
int
cttybuf_fd ()
{
int ctty = CTTY_FILENO;
if (ctty < 0)
{
ctty = dup(STDIN_FILENO);
if (ctty < 0)
throw ctty_error(CTTY_DUP, strerror(errno));
set_cloexec(ctty);
}
return ctty;
}
/// A streambuf for cctty.
// boost::iostreams::file_descriptor cttybuf(cttybuf_fd(), close_handle);
}
#ifdef BOOST_IOSTREAMS_CLOSE_HANDLE_OLD
fdstream cctty(cttybuf_fd(), true);
#else
fdstream cctty(cttybuf_fd(), boost::iostreams::close_handle);
#endif
}
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