tty: add TIOCVHANGUP to allow clean tty shutdown of all ttys

This is useful for system management software so that it can kick
off things like gettys and everything that's started from a tty,
before we reuse it from/for something else or shut it down.

Without this ioctl it would have to temporarily become the owner of
the tty, then call vhangup() and then give it up again.

Cc: Lennart Poettering <[email protected]>
Signed-off-by: Kay Sievers <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

diff --git a/arch/alpha/include/asm/ioctls.h b/arch/alpha/include/asm/ioctls.h
index 034b6cf5d9f31b1d3693746fe739331534f4b802..80e1cee90f1f7df7cb6ec06ffb4c2e58191f1485 100644 (file)
--- a/arch/alpha/include/asm/ioctls.h
+++ b/arch/alpha/include/asm/ioctls.h
@@ -94,6 +94,7 @@
 #define TIOCSPTLCK     _IOW('T',0x31, int)  /* Lock/unlock Pty */
 #define TIOCGDEV       _IOR('T',0x32, unsigned int) /* Get primary device node of /dev/console */
 #define TIOCSIG                _IOW('T',0x36, int)  /* Generate signal on Pty slave */
+#define TIOCVHANGUP    0x5437
 
 #define TIOCSERCONFIG  0x5453
 #define TIOCSERGWILD   0x5454

diff --git a/arch/mips/include/asm/ioctls.h b/arch/mips/include/asm/ioctls.h
index d967b8997626038ee3fe187721a467b80aae6967..92403c3d6007cb465c1c68d3888af9df7d4ad99d 100644 (file)
--- a/arch/mips/include/asm/ioctls.h
+++ b/arch/mips/include/asm/ioctls.h
@@ -85,6 +85,7 @@
 #define TIOCSPTLCK     _IOW('T', 0x31, int)  /* Lock/unlock Pty */
 #define TIOCGDEV       _IOR('T', 0x32, unsigned int) /* Get primary device node of /dev/console */
 #define TIOCSIG                _IOW('T', 0x36, int)  /* Generate signal on Pty slave */
+#define TIOCVHANGUP    0x5437
 
 /* I hope the range from 0x5480 on is free ... */
 #define TIOCSCTTY      0x5480          /* become controlling tty */

diff --git a/arch/parisc/include/asm/ioctls.h b/arch/parisc/include/asm/ioctls.h
index 6ba80d03623ada75d9413f60180dbab53f255d88..054ec06f9e233ceb4a8f3ca22d9eae6e91729c25 100644 (file)
--- a/arch/parisc/include/asm/ioctls.h
+++ b/arch/parisc/include/asm/ioctls.h
@@ -54,6 +54,7 @@
 #define TIOCSPTLCK     _IOW('T',0x31, int)  /* Lock/unlock Pty */
 #define TIOCGDEV       _IOR('T',0x32, int)  /* Get primary device node of /dev/console */
 #define TIOCSIG                _IOW('T',0x36, int)  /* Generate signal on Pty slave */
+#define TIOCVHANGUP    0x5437
 
 #define FIONCLEX       0x5450  /* these numbers need to be adjusted. */
 #define FIOCLEX                0x5451

diff --git a/arch/powerpc/include/asm/ioctls.h b/arch/powerpc/include/asm/ioctls.h
index c7dc17cf84f1f37a9ac1663e41c380153a2b1e99..e9b78870aaab15dc1bf279510e338dc53a608f7c 100644 (file)
--- a/arch/powerpc/include/asm/ioctls.h
+++ b/arch/powerpc/include/asm/ioctls.h
@@ -96,6 +96,7 @@
 #define TIOCSPTLCK     _IOW('T',0x31, int)  /* Lock/unlock Pty */
 #define TIOCGDEV       _IOR('T',0x32, unsigned int) /* Get primary device node of /dev/console */
 #define TIOCSIG                _IOW('T',0x36, int)  /* Generate signal on Pty slave */
+#define TIOCVHANGUP    0x5437
 
 #define TIOCSERCONFIG  0x5453
 #define TIOCSERGWILD   0x5454

diff --git a/arch/sh/include/asm/ioctls.h b/arch/sh/include/asm/ioctls.h
index 84e85a79263839011b260a236b9630083311d693..a6769f352bf6b7525ea5e9094e0d94517c984a18 100644 (file)
--- a/arch/sh/include/asm/ioctls.h
+++ b/arch/sh/include/asm/ioctls.h
@@ -87,6 +87,7 @@
 #define TIOCSPTLCK     _IOW('T',0x31, int)  /* Lock/unlock Pty */
 #define TIOCGDEV       _IOR('T',0x32, unsigned int) /* Get primary device node of /dev/console */
 #define TIOCSIG                _IOW('T',0x36, int)  /* Generate signal on Pty slave */
+#define TIOCVHANGUP    _IO('T', 0x37)
 
 #define TIOCSERCONFIG  _IO('T', 83) /* 0x5453 */
 #define TIOCSERGWILD   _IOR('T', 84,  int) /* 0x5454 */

diff --git a/arch/sparc/include/asm/ioctls.h b/arch/sparc/include/asm/ioctls.h
index ed3807b96bb5aef8d988d4f81bffe60260cbbcd5..28d0c8b02cc3c054dae2c23c737afd5ffdf8a9c2 100644 (file)
--- a/arch/sparc/include/asm/ioctls.h
+++ b/arch/sparc/include/asm/ioctls.h
@@ -20,6 +20,7 @@
 #define TCSETSW2       _IOW('T', 14, struct termios2)
 #define TCSETSF2       _IOW('T', 15, struct termios2)
 #define TIOCGDEV       _IOR('T',0x32, unsigned int) /* Get primary device node of /dev/console */
+#define TIOCVHANGUP    _IO('T', 0x37)
 
 /* Note that all the ioctls that are not available in Linux have a 
  * double underscore on the front to: a) avoid some programs to

diff --git a/arch/xtensa/include/asm/ioctls.h b/arch/xtensa/include/asm/ioctls.h
index ccf1800f0b0c208c185235dac38bd3749fb893fe..fd1d1369a407875f24b15b7c6dc9169f67896ef4 100644 (file)
--- a/arch/xtensa/include/asm/ioctls.h
+++ b/arch/xtensa/include/asm/ioctls.h
@@ -100,6 +100,7 @@
 #define TIOCSPTLCK     _IOW('T',0x31, int)  /* Lock/unlock Pty */
 #define TIOCGDEV       _IOR('T',0x32, unsigned int) /* Get primary device node of /dev/console */
 #define TIOCSIG                _IOW('T',0x36, int)  /* Generate signal on Pty slave */
+#define TIOCVHANGUP    _IO('T', 0x37)
 
 #define TIOCSERCONFIG  _IO('T', 83)
 #define TIOCSERGWILD   _IOR('T', 84,  int)

diff --git a/drivers/tty/tty_io.c b/drivers/tty/tty_io.c
index 20a862a2a0c28cd8e45a139672a874d83080b29c..8ef2d69470ec9379773f2cfc20a5eb976f2e1fa9 100644 (file)
--- a/drivers/tty/tty_io.c
+++ b/drivers/tty/tty_io.c
@@ -2626,6 +2626,11 @@ long tty_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
                return put_user(tty->ldisc->ops->num, (int __user *)p);
        case TIOCSETD:
                return tiocsetd(tty, p);
+       case TIOCVHANGUP:
+               if (!capable(CAP_SYS_ADMIN))
+                       return -EPERM;
+               tty_vhangup(tty);
+               return 0;
        case TIOCGDEV:
        {
                unsigned int ret = new_encode_dev(tty_devnum(real_tty));

diff --git a/include/asm-generic/ioctls.h b/include/asm-generic/ioctls.h
index 3f3f2d189fb86d3cd6cb5c93b8e45cef6d6e954a..199975fac395745342a6cabef1bfb612e73fc1dc 100644 (file)
--- a/include/asm-generic/ioctls.h
+++ b/include/asm-generic/ioctls.h
@@ -73,6 +73,7 @@
 #define TCSETXF                0x5434
 #define TCSETXW                0x5435
 #define TIOCSIG                _IOW('T', 0x36, int)  /* pty: generate signal */
+#define TIOCVHANGUP    0x5437
 
 #define FIONCLEX       0x5450
 #define FIOCLEX                0x5451