diff options
| author | phk <phk@FreeBSD.org> | 2001-05-25 13:23:42 +0000 |
|---|---|---|
| committer | phk <phk@FreeBSD.org> | 2001-05-25 13:23:42 +0000 |
| commit | 71a2c9473e41ba207660ffe8ae03ce8220a6344c (patch) | |
| tree | cc08c8f7269504de5bfaac89e50cc97654ab2e21 /sys/kern/tty_pty.c | |
| parent | e478212afdc19df583f5c90737b556e1ee9191b7 (diff) | |
| download | FreeBSD-src-71a2c9473e41ba207660ffe8ae03ce8220a6344c.zip FreeBSD-src-71a2c9473e41ba207660ffe8ae03ce8220a6344c.tar.gz | |
Make the PTY drivers cloning algorithm create "CHEAPCLONE" dev_t,
so that some twit cannot allocate all 256 PTY's with "ls -l".
Diffstat (limited to 'sys/kern/tty_pty.c')
| -rw-r--r-- | sys/kern/tty_pty.c | 23 |
1 files changed, 12 insertions, 11 deletions
diff --git a/sys/kern/tty_pty.c b/sys/kern/tty_pty.c index 9ff369b..d533070 100644 --- a/sys/kern/tty_pty.c +++ b/sys/kern/tty_pty.c @@ -59,7 +59,7 @@ static MALLOC_DEFINE(M_PTY, "ptys", "pty data structures"); static void ptsstart __P((struct tty *tp)); static void ptsstop __P((struct tty *tp, int rw)); static void ptcwakeup __P((struct tty *tp, int flag)); -static dev_t ptyinit __P((int n)); +static dev_t ptyinit __P((dev_t cdev)); static d_open_t ptsopen; static d_close_t ptsclose; @@ -126,6 +126,7 @@ struct pt_ioctl { #define PF_NOSTOP 0x40 #define PF_UCNTL 0x80 /* user control mode */ +static char *names = "pqrsPQRS"; /* * This function creates and initializes a pts/ptc pair * @@ -136,13 +137,14 @@ struct pt_ioctl { * than 256 ptys. */ static dev_t -ptyinit(n) - int n; +ptyinit(dev_t devc) { - dev_t devs, devc; - char *names = "pqrsPQRS"; + dev_t devs; struct pt_ioctl *pt; + int n; + devc->si_flags &= ~SI_CHEAPCLONE; + n = minor(devc); /* For now we only map the lower 8 bits of the minor */ if (n & ~0xff) return (NODEV); @@ -150,8 +152,7 @@ ptyinit(n) pt = malloc(sizeof(*pt), M_PTY, M_WAITOK | M_ZERO); pt->devs = devs = make_dev(&pts_cdevsw, n, UID_ROOT, GID_WHEEL, 0666, "tty%c%r", names[n / 32], n % 32); - pt->devc = devc = make_dev(&ptc_cdevsw, n, - UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[n / 32], n % 32); + pt->devc = devc; devs->si_drv1 = devc->si_drv1 = pt; devs->si_tty = devc->si_tty = &pt->pt_tty; @@ -171,8 +172,6 @@ ptsopen(dev, flag, devtype, p) struct pt_ioctl *pti; if (!dev->si_drv1) - ptyinit(minor(dev)); - if (!dev->si_drv1) return(ENXIO); pti = dev->si_drv1; tp = dev->si_tty; @@ -334,7 +333,7 @@ ptcopen(dev, flag, devtype, p) struct pt_ioctl *pti; if (!dev->si_drv1) - ptyinit(minor(dev)); + ptyinit(dev); if (!dev->si_drv1) return(ENXIO); tp = dev->si_tty; @@ -836,7 +835,9 @@ pty_clone(arg, name, namelen, dev) u += name[4] - 'a' + 10; else return; - *dev = ptyinit(u); + *dev = make_dev(&ptc_cdevsw, u, + UID_ROOT, GID_WHEEL, 0666, "pty%c%r", names[u / 32], u % 32); + (*dev)->si_flags |= SI_CHEAPCLONE; return; } |
