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linux: Retry VT ioctls while errno == EINTR 

When the smart scheduler is enabled, the VT ioctls (particularly
VT_WAITACTIVE) can be interrupted by the smart scheduler's SIGALRMs.
Previously, this caused the server to immediately continue on to
ScreenInit, almost certainly causing a crash or failure because the X
server that owned the VT hadn't finished cleaning up.  As of commit
7ee965a300, it causes a FatalError
instead.

Retrying the ioctl as long as it fails with errno == EINTR fixes the
problem and allows server regenerations to trigger VT switches that
actually succeed.

Signed-off-by: Aaron Plattner <aplattner@nvidia.com>
Reviewed-by: Peter Hutterer <peter.hutterer@who-t.net>
Reviewed-by: Cyril Brulebois <kibi@debian.org>
Signed-off-by: Keith Packard <keithp@keithp.com>
This commit is contained in:
Aaron Plattner 2011-04-18 08:23:48 -07:00 committed by Keith Packard
parent 302bdc3c96
commit 88c4622b59
1 changed files with 49 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

81
hw/xfree86/os-support/linux/lnx_init.c
View File

@ -62,17 +62,21 @@ drain_console(int fd, void *closure)
static void static void
switch_to(int vt, const char *from) switch_to(int vt, const char *from)
{ {
if (ioctl(xf86Info.consoleFd, VT_ACTIVATE, vt) < 0) int ret;
FatalError("%s: VT_ACTIVATE failed: %s\n", from, strerror(errno));
if (ioctl(xf86Info.consoleFd, VT_WAITACTIVE, vt) < 0) SYSCALL(ret = ioctl(xf86Info.consoleFd, VT_ACTIVATE, vt));
FatalError("%s: VT_WAITACTIVE failed: %s\n", from, strerror(errno)); if (ret < 0)
FatalError("%s: VT_ACTIVATE failed: %s\n", from, strerror(errno));
SYSCALL(ret = ioctl(xf86Info.consoleFd, VT_WAITACTIVE, vt));
if (ret < 0)
FatalError("%s: VT_WAITACTIVE failed: %s\n", from, strerror(errno));
} }
void void
xf86OpenConsole(void) xf86OpenConsole(void)
{ {
int i, fd = -1; int i, fd = -1, ret;
struct vt_mode VT; struct vt_mode VT;
struct vt_stat vts; struct vt_stat vts;
MessageType from = X_PROBED; MessageType from = X_PROBED;
@ -107,17 +111,19 @@ xf86OpenConsole(void)
if (ShareVTs) if (ShareVTs)
{ {
if (ioctl(fd, VT_GETSTATE, &vts) == 0) SYSCALL(ret = ioctl(fd, VT_GETSTATE, &vts));
xf86Info.vtno = vts.v_active; if (ret < 0)
else FatalError("xf86OpenConsole: Cannot find the current"
FatalError("xf86OpenConsole: Cannot find the current" " VT (%s)\n", strerror(errno));
" VT (%s)\n", strerror(errno)); xf86Info.vtno = vts.v_active;
} else { } else {
if ((ioctl(fd, VT_OPENQRY, &xf86Info.vtno) < 0) || SYSCALL(ret = ioctl(fd, VT_OPENQRY, &xf86Info.vtno));
(xf86Info.vtno == -1)) if (ret < 0)
FatalError("xf86OpenConsole: Cannot find a free VT: %s\n", FatalError("xf86OpenConsole: Cannot find a free VT: "
strerror(errno)); "%s\n", strerror(errno));
} if (xf86Info.vtno == -1)
FatalError("xf86OpenConsole: Cannot find a free VT\n");
}
close(fd); close(fd);
} }
@ -159,7 +165,8 @@ xf86OpenConsole(void)
* Linux doesn't switch to an active vt after the last close of a vt, * Linux doesn't switch to an active vt after the last close of a vt,
* so we do this ourselves by remembering which is active now. * so we do this ourselves by remembering which is active now.
*/ */
if (ioctl(xf86Info.consoleFd, VT_GETSTATE, &vts) < 0) SYSCALL(ret = ioctl(xf86Info.consoleFd, VT_GETSTATE, &vts));
if (ret < 0)
xf86Msg(X_WARNING,"xf86OpenConsole: VT_GETSTATE failed: %s\n", xf86Msg(X_WARNING,"xf86OpenConsole: VT_GETSTATE failed: %s\n",
strerror(errno)); strerror(errno));
else else
@ -171,7 +178,7 @@ xf86OpenConsole(void)
* Detach from the controlling tty to avoid char loss * Detach from the controlling tty to avoid char loss
*/ */
if ((i = open("/dev/tty",O_RDWR)) >= 0) { if ((i = open("/dev/tty",O_RDWR)) >= 0) {
ioctl(i, TIOCNOTTY, 0); SYSCALL(ioctl(i, TIOCNOTTY, 0));
close(i); close(i);
} }
} }
@ -186,9 +193,10 @@ xf86OpenConsole(void)
*/ */
switch_to(xf86Info.vtno, "xf86OpenConsole"); switch_to(xf86Info.vtno, "xf86OpenConsole");
if (ioctl(xf86Info.consoleFd, VT_GETMODE, &VT) < 0) SYSCALL(ret = ioctl(xf86Info.consoleFd, VT_GETMODE, &VT));
FatalError("xf86OpenConsole: VT_GETMODE failed %s\n", if (ret < 0)
strerror(errno)); FatalError("xf86OpenConsole: VT_GETMODE failed %s\n",
strerror(errno));
signal(SIGUSR1, xf86VTRequest); signal(SIGUSR1, xf86VTRequest);
@ -196,20 +204,23 @@ xf86OpenConsole(void)
VT.relsig = SIGUSR1; VT.relsig = SIGUSR1;
VT.acqsig = SIGUSR1; VT.acqsig = SIGUSR1;
if (ioctl(xf86Info.consoleFd, VT_SETMODE, &VT) < 0) SYSCALL(ret = ioctl(xf86Info.consoleFd, VT_SETMODE, &VT));
FatalError("xf86OpenConsole: VT_SETMODE VT_PROCESS failed: %s\n", if (ret < 0)
FatalError("xf86OpenConsole: VT_SETMODE VT_PROCESS failed: %s\n",
strerror(errno)); strerror(errno));
if (ioctl(xf86Info.consoleFd, KDSETMODE, KD_GRAPHICS) < 0) SYSCALL(ret = ioctl(xf86Info.consoleFd, KDSETMODE, KD_GRAPHICS));
FatalError("xf86OpenConsole: KDSETMODE KD_GRAPHICS failed %s\n", if (ret < 0)
strerror(errno)); FatalError("xf86OpenConsole: KDSETMODE KD_GRAPHICS failed %s\n",
strerror(errno));
tcgetattr(xf86Info.consoleFd, &tty_attr); tcgetattr(xf86Info.consoleFd, &tty_attr);
ioctl(xf86Info.consoleFd, KDGKBMODE, &tty_mode); SYSCALL(ioctl(xf86Info.consoleFd, KDGKBMODE, &tty_mode));
if (ioctl(xf86Info.consoleFd, KDSKBMODE, K_RAW) < 0) SYSCALL(ret = ioctl(xf86Info.consoleFd, KDSKBMODE, K_RAW));
FatalError("xf86OpenConsole: KDSKBMODE K_RAW failed %s\n", if (ret < 0)
strerror(errno)); FatalError("xf86OpenConsole: KDSKBMODE K_RAW failed %s\n",
strerror(errno));
nTty = tty_attr; nTty = tty_attr;
nTty.c_iflag = (IGNPAR | IGNBRK) & (~PARMRK) & (~ISTRIP); nTty.c_iflag = (IGNPAR | IGNBRK) & (~PARMRK) & (~ISTRIP);
@ -241,6 +252,7 @@ void
xf86CloseConsole(void) xf86CloseConsole(void)
{ {
struct vt_mode VT; struct vt_mode VT;
int ret;
if (ShareVTs) { if (ShareVTs) {
close(xf86Info.consoleFd); close(xf86Info.consoleFd);
@ -253,20 +265,23 @@ xf86CloseConsole(void)
}; };
/* Back to text mode ... */ /* Back to text mode ... */
if (ioctl(xf86Info.consoleFd, KDSETMODE, KD_TEXT) < 0) SYSCALL(ret = ioctl(xf86Info.consoleFd, KDSETMODE, KD_TEXT));
if (ret < 0)
xf86Msg(X_WARNING, "xf86CloseConsole: KDSETMODE failed: %s\n", xf86Msg(X_WARNING, "xf86CloseConsole: KDSETMODE failed: %s\n",
strerror(errno)); strerror(errno));
ioctl(xf86Info.consoleFd, KDSKBMODE, tty_mode); SYSCALL(ioctl(xf86Info.consoleFd, KDSKBMODE, tty_mode));
tcsetattr(xf86Info.consoleFd, TCSANOW, &tty_attr); tcsetattr(xf86Info.consoleFd, TCSANOW, &tty_attr);
if (ioctl(xf86Info.consoleFd, VT_GETMODE, &VT) < 0) SYSCALL(ret = ioctl(xf86Info.consoleFd, VT_GETMODE, &VT));
if (ret < 0)
xf86Msg(X_WARNING, "xf86CloseConsole: VT_GETMODE failed: %s\n", xf86Msg(X_WARNING, "xf86CloseConsole: VT_GETMODE failed: %s\n",
strerror(errno)); strerror(errno));
else { else {
/* set dflt vt handling */ /* set dflt vt handling */
VT.mode = VT_AUTO; VT.mode = VT_AUTO;
if (ioctl(xf86Info.consoleFd, VT_SETMODE, &VT) < 0) SYSCALL(ret = ioctl(xf86Info.consoleFd, VT_SETMODE, &VT));
if (ret < 0)
xf86Msg(X_WARNING, "xf86CloseConsole: VT_SETMODE failed: %s\n", xf86Msg(X_WARNING, "xf86CloseConsole: VT_SETMODE failed: %s\n",
strerror(errno)); strerror(errno));
} }