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save/restore the tty

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Save the tty configuration before calling lxc_start and
restore it right after it has been changed.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
This commit is contained in:
Daniel Lezcano
2009-06-07 21:48:46 +02:00
committed by Daniel Lezcano
parent d4fca29f01
commit f8e09a0b76
1 changed files with 43 additions and 8 deletions
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51
src/lxc/lxc_start.c
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@@ -26,6 +26,7 @@
#include <string.h>
#include <termios.h>
#include <errno.h>
#include <signal.h>
#include <sys/param.h>
#include <sys/utsname.h>
#include <sys/types.h>
@@ -58,6 +59,46 @@ Options :\n\
.checker = NULL,
};
static int save_tty(struct termios *tios)
{
if (!isatty(0))
return 0;
if (tcgetattr(0, tios))
WARN("failed to get current terminal settings : %s",
strerror(errno));
return 0;
}
static int restore_tty(struct termios *tios)
{
struct termios current_tios;
void (*oldhandler)(int);
int ret;
if (!isatty(0))
return 0;
if (tcgetattr(0, &current_tios)) {
ERROR("failed to get current terminal settings : %s",
strerror(errno));
return -1;
}
if (!memcmp(tios, &current_tios, sizeof(*tios)))
return 0;
oldhandler = signal(SIGTTOU, SIG_IGN);
ret = tcsetattr(0, TCSADRAIN, tios);
if (ret)
ERROR("failed to restore terminal attributes");
signal(SIGTTOU, oldhandler);
return ret;
}
int main(int argc, char *argv[])
{
char *const *args;
@@ -81,17 +122,11 @@ int main(int argc, char *argv[])
my_args.progname, my_args.quiet))
return err;
if (tcgetattr(0, &tios)) {
ERROR("failed to get current terminal settings : %s",
strerror(errno));
return err;
}
save_tty(&tios);
err = lxc_start(my_args.name, args);
if (tcsetattr(0, TCSAFLUSH, &tios))
ERROR("failed to restore terminal settings : %s",
strerror(errno));
restore_tty(&tios);
return err;
}