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set terminal settings when console is a tty

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As the console output can be a tty, we want to have the terminal to
be set as a specific manner to not echo and receive signals from the
keyboard.

Signed-off-by: Daniel Lezcano <dlezcano@fr.ibm.com>
This commit is contained in:
Daniel Lezcano 2010-02-24 10:57:43 +01:00 committed by Daniel Lezcano
parent 63376d7db3
commit e0dc0de76e
2 changed files with 41 additions and 0 deletions
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1
src/lxc/conf.h
View File

@ -158,6 +158,7 @@ struct lxc_console {
int master; int master;
int peer; int peer;
char name[MAXPATHLEN]; char name[MAXPATHLEN];
struct termios *tios;
}; };
/* /*

40
src/lxc/console.c
View File

@ -22,6 +22,7 @@
*/ */
#include <stdio.h> #include <stdio.h>
#include <stdlib.h>
#include <unistd.h> #include <unistd.h>
#include <fcntl.h> #include <fcntl.h>
#include <errno.h> #include <errno.h>
@ -140,6 +141,8 @@ out_close:
int lxc_create_console(struct lxc_console *console) int lxc_create_console(struct lxc_console *console)
{ {
struct termios tios;
if (openpty(&console->master, &console->slave, if (openpty(&console->master, &console->slave,
console->name, NULL, NULL)) { console->name, NULL, NULL)) {
SYSERROR("failed to allocate a pty"); SYSERROR("failed to allocate a pty");
@ -156,7 +159,41 @@ int lxc_create_console(struct lxc_console *console)
goto err; goto err;
} }
if (!isatty(console->peer))
return 0;
console->tios = malloc(sizeof(tios));
if (!console->tios) {
SYSERROR("failed to allocate memory");
goto err;
}
/* Get termios */
if (tcgetattr(console->peer, console->tios)) {
SYSERROR("failed to get current terminal settings");
goto err_free;
}
tios = *console->tios;
/* Remove the echo characters and signal reception, the echo
* will be done below with master proxying */
tios.c_iflag &= ~IGNBRK;
tios.c_iflag &= BRKINT;
tios.c_lflag &= ~(ECHO|ICANON|ISIG);
tios.c_cc[VMIN] = 1;
tios.c_cc[VTIME] = 0;
/* Set new attributes */
if (tcsetattr(console->peer, TCSAFLUSH, &tios)) {
ERROR("failed to set new terminal settings");
goto err_free;
}
return 0; return 0;
err_free:
free(console->tios);
err: err:
close(console->master); close(console->master);
close(console->slave); close(console->slave);
@ -165,6 +202,9 @@ err:
void lxc_delete_console(const struct lxc_console *console) void lxc_delete_console(const struct lxc_console *console)
{ {
if (console->tios &&
tcsetattr(console->peer, TCSAFLUSH, console->tios))
WARN("failed to set old terminal settings");
close(console->master); close(console->master);
close(console->slave); close(console->slave);
} }