Remove the 1000 pseudo terminal limit from pts(4).

Even with the old utmp format, we could in fact go to pts/9999, because
ut_line wasn't guaranteed to be null terminated there.

2 files changed, 0 insertions, 34 deletions

diff --git a/share/man/man4/pts.4 b/share/man/man4/pts.4
index d0e8832..88eb29c 100644
--- a/share/man/man4/pts.4
+++ b/share/man/man4/pts.4
@@ -136,12 +136,6 @@ This
 should not be used directly. It is used to implement routines like
 .Xr grantpt 3 .
 .El
-.Pp
-The maximum number of pseudo-terminals is limited to 1000.
-It is not possible to use more than 1000 pseudo-terminals, as all software
-which use
-.Xr utmp 5
-will not be able to handle pseudo-terminals with number superior to 999.
 .Sh FILES
 The files used by this
 pseudo-terminals implementation are:
@@ -150,26 +144,6 @@ pseudo-terminals implementation are:
 .It Pa /dev/pts/[num]
 Pseudo-terminal slave devices.
 .El
-.Sh SYSCTL VARIABLES
-The following
-.Xr sysctl 8
-variables can be used to modify or monitor
-.Nm
-behavior.
-.Bl -tag -width indent
-.It Va kern.pts_maxdev
-Highest pseudo-terminal unit number to be allocated.
-Because
-.Xr utmp 5
-is restricted to an 8-byte line name size,
-.Nm
-will not create any pseudo-terminals with a unit number above 999 by
-default.
-After increasing
-.Dv UT_LINESIZE ,
-this variable can be changed to allow more than 1000 pseudo-terminals to
-be allocated simultaneously.
-.El
 .Sh DIAGNOSTICS
 None.
 .Sh SEE ALSO
diff --git a/sys/kern/tty_pts.c b/sys/kern/tty_pts.c
index 632175b..290fdc2 100644
--- a/sys/kern/tty_pts.c
+++ b/sys/kern/tty_pts.c
@@ -71,9 +71,6 @@ __FBSDID("$FreeBSD$");
  * UT_LINESIZE.
  */
 static struct unrhdr *pts_pool;
-static unsigned int pts_maxdev = 999;
-SYSCTL_UINT(_kern, OID_AUTO, pts_maxdev, CTLFLAG_RW, &pts_maxdev, 0,
-    "Maximum amount of pts(4) pseudo-terminals");
 
 static MALLOC_DEFINE(M_PTS, "pts", "pseudo tty device");
 
@@ -725,11 +722,6 @@ pts_alloc(int fflags, struct thread *td, struct file *fp)
 		chgptscnt(uid, -1, 0);
 		return (EAGAIN);
 	}
-	if (unit > pts_maxdev) {
-		free_unr(pts_pool, unit);
-		chgptscnt(uid, -1, 0);
-		return (EAGAIN);
-	}
 
 	/* Allocate TTY and softc. */
 	psc = malloc(sizeof(struct pts_softc), M_PTS, M_WAITOK|M_ZERO);