[illumos-gate merge]

commit ca783257c986cddcc674ae22916a6766b98a2d36
    5513 KM_NORMALPRI should be documented in kmem_alloc(9f) and kmem_cache_create(9f) man pages
    14465 Present KM_NOSLEEP_LAZY as documented interface
commit 36589d6bb0cdae89e166b57b0d64ae56d53247d9
    13500 Want support for overlay networks
commit 68df0c4f60a2e57680d6d1e6dba32ffa2d035538
    14513 nvmeadm list-firmware
commit 8466ab889653be2119e4a8966b6bc4e2d5ee2fb6
    14507 nvmeadm shouldn't allow writing firmware to a read-only slot 1
    14508 improve nvmeadm firmware reporting
    14509 nvmeadm commit-firmware error reporting isn't working as intended
commit 1fa2a66491e7d8ae0be84e7da4da8e812480c710
    14249 pseudo-terminal nomenclature should reflect POSIX

Conflicts:
    usr/src/cmd/cmd-inet/etc/services
    usr/src/cmd/dladm/Makefile
    usr/src/cmd/dladm/dladm.c
    usr/src/cmd/varpd/Makefile
    usr/src/cmd/varpd/varpd.c
    usr/src/cmd/zoneadmd/zcons.c
    usr/src/lib/Makefile
    usr/src/lib/libdladm/Makefile
    usr/src/lib/libdladm/common/libdladm.c
    usr/src/lib/libdladm/common/libdladm.h
    usr/src/lib/libdladm/common/libdladm_impl.h
    usr/src/lib/libdladm/common/libdloverlay.c
    usr/src/lib/libdladm/common/libdlvnic.c
    usr/src/lib/varpd/Makefile
    usr/src/lib/varpd/direct/Makefile.com
    usr/src/lib/varpd/direct/amd64/Makefile
    usr/src/lib/varpd/direct/common/libvarpd_direct.c
    usr/src/lib/varpd/direct/i386/Makefile
    usr/src/lib/varpd/files/Makefile
    usr/src/lib/varpd/files/Makefile.com
    usr/src/lib/varpd/files/amd64/Makefile
    usr/src/lib/varpd/files/common/libvarpd_files.c
    usr/src/lib/varpd/files/i386/Makefile
    usr/src/lib/varpd/libvarpd/Makefile
    usr/src/lib/varpd/libvarpd/Makefile.com
    usr/src/lib/varpd/libvarpd/amd64/Makefile
    usr/src/lib/varpd/libvarpd/common/libvarpd.c
    usr/src/lib/varpd/libvarpd/common/libvarpd_arp.c
    usr/src/lib/varpd/libvarpd/common/libvarpd_client.c
    usr/src/lib/varpd/libvarpd/common/libvarpd_impl.h
    usr/src/lib/varpd/libvarpd/common/libvarpd_overlay.c
    usr/src/lib/varpd/libvarpd/common/libvarpd_panic.c
    usr/src/lib/varpd/libvarpd/common/libvarpd_plugin.c
    usr/src/lib/varpd/libvarpd/common/libvarpd_provider.h
    usr/src/lib/varpd/libvarpd/common/libvarpd_util.c
    usr/src/lib/varpd/libvarpd/i386/Makefile
    usr/src/man/man1m/dladm.1m
    usr/src/man/man5/overlay.5
    usr/src/man/man7p/Makefile
    usr/src/man/man7p/vxlan.7p
    usr/src/uts/Makefile.uts
    usr/src/uts/common/Makefile.files
    usr/src/uts/common/io/overlay/overlay.c
    usr/src/uts/common/io/overlay/overlay_mux.c
    usr/src/uts/common/io/overlay/overlay_target.c
    usr/src/uts/common/sys/dls_mgmt.h
    usr/src/uts/common/sys/mac_provider.h
    usr/src/uts/common/sys/overlay_common.h
    usr/src/uts/common/sys/overlay_impl.h
    usr/src/uts/common/sys/overlay_plugin.h
    usr/src/uts/common/sys/overlay_target.h

4 files changed, 338 insertions, 364 deletions

diff --git a/usr/src/man/man3c/grantpt.3c b/usr/src/man/man3c/grantpt.3c
index 7e523af80b..154a5a07f5 100644
--- a/usr/src/man/man3c/grantpt.3c
+++ b/usr/src/man/man3c/grantpt.3c
@@ -43,88 +43,76 @@
 .\" Copyright 1989 AT&T
 .\" Portions Copyright (c) 1994, X/Open Company Limited.  All Rights Reserved.
 .\" Copyright (c) 2006, Sun Microsystems, Inc.  All Rights Reserved.
+.\" Copyright 2022 Oxide Computer Company
 .\"
-.TH GRANTPT 3C "Aug 14, 2006"
-.SH NAME
-grantpt \- grant access to the slave pseudo-terminal device
-.SH SYNOPSIS
-.LP
-.nf
-#include <stdlib.h>
-
-\fBint\fR \fBgrantpt\fR(\fBint\fR \fIfildes\fR);
-.fi
-
-.SH DESCRIPTION
-.sp
-.LP
-The \fBgrantpt()\fR function changes the mode and ownership of the slave
-pseudo-terminal device associated with its master  pseudo-terminal counterpart.
-\fIfildes\fR is the file descriptor returned from a successful open of the
-master pseudo-terminal device. The user ID of the slave is set to the real UID
-of the calling process and the group ID is set to a reserved group. The
-permission mode of the slave pseudo-terminal is set to readable and writable by
-the owner and writable by the group.
-.SH RETURN VALUES
-.sp
-.LP
-Upon successful completion, \fBgrantpt()\fR returns \fB0\fR. Otherwise, it
-returns \fB\(mi1\fR and sets \fBerrno\fR to indicate the error.
-.SH ERRORS
-.sp
-.LP
-The \fBgrantpt()\fR function may fail if:
-.sp
-.ne 2
-.na
-\fB\fBEBADF\fR\fR
-.ad
-.RS 10n
-The \fIfildes\fR argument is not a valid open file descriptor.
-.RE
-
-.sp
-.ne 2
-.na
-\fB\fBEINVAL\fR\fR
-.ad
-.RS 10n
-The \fIfildes\fR argument is not associated with a master pseudo-terminal
+.Dd February 5, 2022
+.Dt GRANTPT 3C
+.Os
+.Sh NAME
+.Nm grantpt
+.Nd grant access to the subsidiary device of a pseudo-terminal
+.Sh SYNOPSIS
+.In stdlib.h
+.Ft int
+.Fo grantpt
+.Fa "int fildes"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn grantpt
+function changes the mode and ownership of the pseudo-terminal subsidiary
+device associated with its pseudo-terminal manager counterpart.
+.Pp
+The
+.Fa fildes
+argument is the file descriptor returned from a successful
+.Xr open 2
+of the pseudo-terminal manager device; e.g., by calling
+.Xr posix_openpt 3C
+or by performing an
+.Xr open 2
+of the
+.Xr ptm 7D
 device.
-.RE
-
-.sp
-.ne 2
-.na
-\fB\fBEACCES\fR\fR
-.ad
-.RS 10n
-The corresponding slave pseudo-terminal device could not be accessed.
-.RE
-
-.SH ATTRIBUTES
-.sp
-.LP
-See \fBattributes\fR(5) for descriptions of the following attributes:
-.sp
-
-.sp
-.TS
-box;
-c | c
-l | l .
-ATTRIBUTE TYPE	ATTRIBUTE VALUE
-_
-Interface Stability	Standard
-_
-MT-Level	Safe
-.TE
-
-.SH SEE ALSO
-.sp
-.LP
-\fBopen\fR(2), \fBptsname\fR(3C), \fBunlockpt\fR(3C), \fBattributes\fR(5),
-\fBstandards\fR(5)
-.sp
-.LP
-\fISTREAMS Programming Guide\fR
+.Pp
+The user ID owner of the subsidiary device is set to the real user ID of the
+calling process.
+The group ID owner is set to a reserved group.
+.Pp
+The permission mode of the subsidiary device is set to be readable and writable
+by the owner, and writable by the group.
+.Sh RETURN VALUES
+.Rv -std grantpt
+.Sh EXAMPLES
+See
+.Xr posix_openpt 3C
+for an example that includes a call to
+.Fn grantpt .
+.Sh ERRORS
+The
+.Fn grantpt
+function may fail if:
+.Bl -tag -width Er
+.It Er EBADF
+The
+.Fa fildes
+argument is not a valid open file descriptor.
+.It Er EINVAL
+The
+.Fa fildes
+argument is not associated with a pseudo-terminal manager device.
+.It Er EACCES
+The corresponding pseudo-terminal subsidiary device could not be accessed.
+.El
+.Sh INTERFACE STABILITY
+.Sy Committed
+.Sh MT LEVEL
+.Sy Safe
+.Sh SEE ALSO
+.Xr open 2 ,
+.Xr posix_openpt 3C ,
+.Xr ptsname 3C ,
+.Xr unlockpt 3C ,
+.Xr attributes 5 ,
+.Xr standards 5 ,
+.Xr ptm 7D
diff --git a/usr/src/man/man3c/posix_openpt.3c b/usr/src/man/man3c/posix_openpt.3c
index 16193b89f3..b009dd6e17 100644
--- a/usr/src/man/man3c/posix_openpt.3c
+++ b/usr/src/man/man3c/posix_openpt.3c
@@ -42,160 +42,142 @@
 .\"
 .\" Copyright (c) 2001, The IEEE and The Open Group.  All Rights Reserved.
 .\" Portions Copyright (c) 2003, Sun Microsystems, Inc. All Rights Reserved.
+.\" Copyright 2022 Oxide Computer Company
 .\"
-.TH POSIX_OPENPT 3C "June 18, 2021"
-.SH NAME
-posix_openpt \- open a pseudo terminal device
-.SH SYNOPSIS
-.nf
-#include <stdlib.h>
-#include <fcntl.h>
-
-\fBint\fR \fBposix_openpt\fR(\fBint\fR \fIoflag\fR);
-.fi
-
-.SH DESCRIPTION
-The \fBposix_openpt()\fR function establishes a connection between a master
-device for a pseudo-terminal and a file descriptor. The file descriptor is used
-by other I/O functions that refer to that pseudo-terminal.
-.sp
-.LP
+.Dd February 5, 2022
+.Dt POSIX_OPENPT 3C
+.Os
+.Sh NAME
+.Nm posix_openpt
+.Nd open a pseudo-terminal manager device
+.Sh SYNOPSIS
+.In stdlib.h
+.In fcntl.h
+.Ft int
+.Fo posix_openpt
+.Fa "int oflag"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn posix_openpt
+function establishes a connection between a manager device for a
+pseudo-terminal and a file descriptor.
+The file descriptor is used by other I/O functions that refer to that
+pseudo-terminal.
+.Pp
 The file status flags and file access modes of the open file description are
-set according to the value of \fIoflag\fR.
-.sp
-.LP
-Values for \fIoflag\fR are constructed by a bitwise-inclusive OR of flags from
-the following list, defined in <\fBfcntl.h\fR>.
-.sp
-.ne 2
-.na
-\fB\fBO_RDWR\fR\fR
-.ad
-.RS 12n
+set according to the value of
+.Fa oflag .
+.Pp
+Values for
+.Fa oflag
+are constructed by a bitwise-inclusive OR of flags from
+the following list, defined in
+.Xr fcntl.h 3HEAD :
+.Bl -tag -width Ds
+.It Dv O_RDWR
 Open for reading and writing.
-.RE
-
-.sp
-.ne 2
-.na
-\fB\fBO_NOCTTY\fR\fR
-.ad
-.RS 12n
-If set, \fBposix_openpt()\fR does not cause the terminal device to become the
-controlling terminal for the process.
-.RE
-
-.sp
-.LP
-The behavior of other values for the \fIoflag\fR argument is unspecified.
-.SH RETURN VALUES
-Upon successful completion, the \fBposix_openpt()\fR function opens a master
-pseudo-terminal device and returns a non-negative integer representing the
-lowest numbered unused file descriptor. Otherwise, -1 is returned and
-\fBerrno\fR is set to indicate the error.
-.SH ERRORS
-The \fBposix_openpt()\fR function will fail if:
-.sp
-.ne 2
-.na
-\fB\fBEMFILE\fR\fR
-.ad
-.RS 10n
-{\fBOPEN_MAX\fR} file descriptors are currently open in the calling process.
-.RE
-
-.sp
-.ne 2
-.na
-\fB\fBENFILE\fR\fR
-.ad
-.RS 10n
-The maximum allowable number of files is currently open in the system.
-.RE
-
-.sp
-.LP
-The \fBposix_openpt()\fR function may fail if:
-.sp
-.ne 2
-.na
-\fB\fBEINVAL\fR\fR
-.ad
-.RS 10n
-The value of \fIoflag\fR is not valid.
-.RE
-
-.sp
-.ne 2
-.na
-\fB\fBEAGAIN\fR\fR
-.ad
-.RS 10n
-Out of pseudo-terminal resources.
-.RE
-
-.sp
-.ne 2
-.na
-\fB\fBENOSR\fR\fR
-.ad
-.RS 10n
-Out of STREAMS resources.
-.RE
-
-.SH EXAMPLES
-\fBExample 1 \fROpen a pseudo-terminal.
-.sp
-.LP
-The following example opens a pseudo-terminal and returns the name of the slave
-device and a file descriptor.
-
-.sp
-.in +2
-.nf
+.It Dv O_NOCTTY
+If set,
+.Fn posix_openpt
+does not cause the terminal device to become the controlling terminal for the
+process.
+.El
+.Pp
+The behavior of other values for the
+.Fa oflag
+argument is unspecified.
+.Sh RETURN VALUES
+The
+.Fn posix_getopt
+function opens a manager pseudo-terminal device and, if successful, returns a
+non-negative integer representing the lowest numbered unused file descriptor ;
+otherwise, the value
+.Sy -1
+is returned and the global variable
+.Va errno
+is set to indicate the error.
+.Sh EXAMPLES
+.Sy Example 1
+Open a pseudo-terminal.
+.Pp
+The following example opens a pseudo-terminal and returns the name of the
+subsidiary device and a file descriptor.
+.Bd -literal -offset Ds
 #include <fcntl.h>
 #include <stdio.h>
-
-int masterfd, slavefd;
-char *slavedevice;
-
-masterfd = posix_openpt(O_RDWR|O_NOCTTY);
-
-if (masterfd == -1
-      || grantpt (masterfd) == -1
-      || unlockpt (masterfd) == -1
-      || (slavedevice = ptsname (masterfd)) == NULL)
-      return -1;
-
-printf("slave device is: %s\en", slavedevice);
-
-slavefd = open(slave, O_RDWR|O_NOCTTY);
-if (slavefd < 0)
-      return -1;
-.fi
-.in -2
-
-.SH USAGE
-This function provides a method for portably obtaining a file descriptor of a
-master terminal device for a pseudo-terminal. The \fBgrantpt\fR(3C) and
-\fBptsname\fR(3C) functions can be used to manipulate mode and ownership
-permissions and to obtain the name of the slave device, respectively.
-.SH ATTRIBUTES
-See \fBattributes\fR(5) for descriptions of the following attributes:
-.sp
-
-.sp
-.TS
-box;
-c | c
-l | l .
-ATTRIBUTE TYPE	ATTRIBUTE VALUE
-_
-Interface Stability	Standard
-_
-MT-Level	MT-Safe
-.TE
-
-.SH SEE ALSO
-\fBopen\fR(2), \fBgrantpt\fR(3C), \fBptsname\fR(3C), \fBunlockpt\fR(3C),
-\fBattributes\fR(5), \fBstandards\fR(5)
+#include <err.h>
+
+int managerfd, subsidiaryfd;
+char *subsidiarydevice;
+
+if ((managerfd = posix_openpt(O_RDWR|O_NOCTTY)) < 0) {
+        err(1, "opening pseudo-terminal manager");
+}
+
+if (grantpt(managerfd) != 0 ||
+    unlockpt(managerfd) != 0 ||
+    (subsidiarydevice = ptsname(managerfd)) == NULL) {
+        (void) close(managerfd);
+        err(1, "locating pseudo-terminal subsidiary");
+}
+
+printf("subsidiary device is: %s\en", subsidiarydevice);
+
+if ((subsidiaryfd = open(subsidiary, O_RDWR|O_NOCTTY)) < 0) {
+        err(1, "opening pseudo-terminal subsidiary");
+}
+.Ed
+.Sh ERRORS
+The
+.Fn posix_openpt
+function will fail if:
+.Bl -tag -width Er
+.It Er EMFILE
+.Brq Dv OPEN_MAX
+file descriptors are currently open in the calling process.
+.It Er ENFILE
+The maximum allowable number of files is currently open in the system.
+.El
+.Pp
+The
+.Fn posix_openpt
+function may fail if:
+.Bl -tag -width Er
+.It Er EINVAL
+The value of
+.Fa oflag
+is not valid.
+.It Er EAGAIN
+The system has run out of pseudo-terminal resources.
+.It Er ENOSR
+The system has run out of STREAMS resources.
+.El
+.Sh USAGE
+This function provides a portable method for obtaining the file descriptor of a
+manager terminal device for a pseudo-terminal, as opposed to using
+.Xr open 2
+on the
+.Xr ptm 7D
+device which is system-specific.
+.Pp
+The
+.Xr grantpt 3C
+function can be used to manipulate the mode and ownership permissions
+of the subsidiary device.
+The
+.Xr ptsname 3C
+function can be used to obtain the name of the subsidiary device.
+.Sh INTERFACE STABILITY
+.Sy Committed
+.Sh MT LEVEL
+.Sy MT-Safe
+.Sh SEE ALSO
+.Xr open 2 ,
+.Xr grantpt 3C ,
+.Xr ptsname 3C ,
+.Xr unlockpt 3C ,
+.Xr attributes 5 ,
+.Xr standards 5 ,
+.Xr ptm 7D ,
+.Xr pts 7D
diff --git a/usr/src/man/man3c/ptsname.3c b/usr/src/man/man3c/ptsname.3c
index 8fa25e2ea6..264a3dcc90 100644
--- a/usr/src/man/man3c/ptsname.3c
+++ b/usr/src/man/man3c/ptsname.3c
@@ -43,59 +43,72 @@
 .\" Copyright 1989 AT&T
 .\" Portions Copyright (c) 1992, X/Open Company Limited  All Rights Reserved
 .\" Copyright (c) 2002, Sun Microsystems, Inc.  All Rights Reserved.
+.\" Copyright 2022 Oxide Computer Company
 .\"
-.TH PTSNAME 3C "Aug 14, 2002"
-.SH NAME
-ptsname \- get name of the slave pseudo-terminal device
-.SH SYNOPSIS
-.LP
-.nf
-#include <stdlib.h>
-
-\fBchar *\fR\fBptsname\fR(\fBint\fR \fIfildes\fR);
-.fi
-
-.SH DESCRIPTION
-.sp
-.LP
-The \fBptsname()\fR function returns the name of the slave pseudo-terminal
-device associated with a master pseudo-terminal device. \fIfildes\fR is a file
-descriptor returned from a successful open of the master device.
-\fBptsname()\fR returns a pointer to a string containing the null-terminated
-path name of the slave device of the form \fB/dev/pts/N\fR, where \fBN\fR is a
-non-negative integer.
-.SH RETURN VALUES
-.sp
-.LP
-Upon successful completion, the function \fBptsname()\fR returns a pointer to a
-string which is the name of the pseudo-terminal slave device. This value points
-to a static data area that is overwritten by each call to \fBptsname()\fR. Upon
-failure, \fBptsname()\fR returns \fINULL\fR. This could occur if \fIfildes\fR
-is an invalid file descriptor or if  the slave device name does not exist in
-the file system.
-.SH ATTRIBUTES
-.sp
-.LP
-See \fBattributes\fR(5) for descriptions of the following attributes:
-.sp
-
-.sp
-.TS
-box;
-c | c
-l | l .
-ATTRIBUTE TYPE	ATTRIBUTE VALUE
-_
-Interface Stability	Standard
-_
-MT-Level	Safe
-.TE
-
-.SH SEE ALSO
-.sp
-.LP
-\fBopen\fR(2), \fBgrantpt\fR(3C), \fBttyname\fR(3C), \fBunlockpt\fR(3C),
-\fBattributes\fR(5), \fBstandards\fR(5)
-.sp
-.LP
-\fISTREAMS Programming Guide\fR
+.Dd February 5, 2022
+.Dt PTSNAME 3C
+.Os
+.Sh NAME
+.Nm ptsname
+.Nd get the name of the subsidiary device of a pseudo-terminal
+.Sh SYNOPSIS
+.In stdlib.h
+.Ft char *
+.Fo ptsname
+.Fa "int fildes"
+.Fc
+.Sh DESCRIPTION
+The
+.Fn ptsname
+function returns the name of the pseudo-terminal subsidiary device associated
+with a pseudo-terminal manager device.
+The
+.Fa fildes
+argument is a file descriptor returned from a successful open of the
+pseudo-terminal manager device; e.g., by calling
+.Xr posix_openpt 3C
+or by performing an
+.Xr open 2
+of the
+.Xr ptm 7D
+device.
+.Pp
+The
+.Fn ptsname
+function returns a pointer to a string containing the null-terminated
+path name of the subsidiary device.
+This string is of the form
+.Pa /dev/pts/N ,
+where
+.Sy N
+is a non-negative integer.
+.Sh RETURN VALUES
+If successful, the
+.Fn ptsname
+function returns a pointer to a string which is the name of the pseudo-terminal
+subsidiary device.
+This value points to a static data area that is overwritten by each call to
+.Fn ptsname .
+.Pp
+Upon failure,
+.Fn ptsname
+returns
+.Dv NULL .
+This could occur if
+.Fa fildes
+is an invalid file descriptor or if the subsidiary device name does not exist
+in the file system.
+.Sh INTERFACE STABILITY
+.Sy Committed
+.Sh MT LEVEL
+.Sy Safe
+.Sh SEE ALSO
+.Xr open 2 ,
+.Xr grantpt 3C ,
+.Xr posix_openpt 3C ,
+.Xr ttyname 3C ,
+.Xr unlockpt 3C ,
+.Xr attributes 5 ,
+.Xr standards 5 ,
+.Xr ptm 7D ,
+.Xr pts 7D
diff --git a/usr/src/man/man3c/unlockpt.3c b/usr/src/man/man3c/unlockpt.3c
index 598a56717d..865c217e32 100644
--- a/usr/src/man/man3c/unlockpt.3c
+++ b/usr/src/man/man3c/unlockpt.3c
@@ -43,78 +43,69 @@
 .\" Copyright 1989 AT&T
 .\" Copyright (c) 1997, The Open Group. All Rights Reserved.
 .\" Portions Copyright (c) 2002, Sun Microsystems, Inc. All Rights Reserved.
+.\" Copyright 2022 Oxide Computer Company
 .\"
-.TH UNLOCKPT 3C "Aug 14, 2002"
-.SH NAME
-unlockpt \- unlock a pseudo-terminal master/slave pair
-.SH SYNOPSIS
-.LP
-.nf
-#include <stdlib.h>
-
-\fBint\fR \fBunlockpt\fR(\fBint\fR \fIfildes\fR);
-.fi
-
-.SH DESCRIPTION
-.sp
-.LP
-The \fBunlockpt()\fR function unlocks the slave pseudo-terminal device
-associated with the master to which \fIfildes\fR refers.
-.sp
-.LP
-Portable applications must call \fBunlockpt()\fR before opening the slave side
-of a pseudo-terminal device.
-.SH RETURN VALUES
-.sp
-.LP
-Upon successful completion, \fBunlockpt()\fR returns \fB0\fR. Otherwise, it
-returns \fB\(mi1\fR and sets \fBerrno\fR to indicate the error.
-.SH ERRORS
-.sp
-.LP
-The \fBunlockpt()\fR function may fail if:
-.sp
-.ne 2
-.na
-\fB\fBEBADF\fR\fR
-.ad
-.RS 10n
-The \fIfildes\fR argument is not a file descriptor open for writing.
-.RE
-
-.sp
-.ne 2
-.na
-\fB\fBEINVAL\fR\fR
-.ad
-.RS 10n
-The \fIfildes\fR argument is not associated with a master pseudo-terminal
-device.
-.RE
-
-.SH ATTRIBUTES
-.sp
-.LP
-See \fBattributes\fR(5) for descriptions of the following attributes:
-.sp
-
-.sp
-.TS
-box;
-c | c
-l | l .
-ATTRIBUTE TYPE	ATTRIBUTE VALUE
-_
-Interface Stability	Standard
-_
-MT-Level	Safe
-.TE
-
-.SH SEE ALSO
-.sp
-.LP
-\fBopen\fR(2), \fBgrantpt\fR(3C), \fBptsname\fR(3C), \fBattributes\fR(5),
-\fBstandards\fR(5)
-.sp
-.LP
-\fISTREAMS Programming Guide\fR
+.Dd February 5, 2022
+.Dt UNLOCKPT 3C
+.Os
+.Sh NAME
+.Nm unlockpt
+.Nd unlock a pseudo-terminal device pair
+.Sh SYNOPSIS
+.In stdlib.h
+.Ft int
+.Fo unlockpt
+.Fa "int fildes"
+.Fc
+.Sh DESCRIPTION
+When a pseudo-terminal manager device is opened, whether through
+.Xr posix_openpt 3C
+or
+.Xr open 2
+on a
+.Xr ptm 7D
+device, the subsidiary device begins operation in a locked state.
+The
+.Fn unlockpt
+function unlocks the pseudo-terminal subsidiary device associated with the
+manager device to which
+.Fa fildes
+refers.
+.Pp
+Portable applications must call
+.Fn unlockpt
+before opening the pseudo-terminal subsidiary device.
+.Sh RETURN VALUES
+.Rv -std unlockpt
+.Sh EXAMPLES
+See
+.Xr posix_openpt 3C
+for an example that includes a call to
+.Fn unlockpt .
+.Sh ERRORS
+The
+.Fn unlockpt
+function may fail if:
+.Bl -tag -width Er
+.It Er EBADF
+The
+.Fa fildes
+argument is not a file descriptor open for writing.
+.It Er EINVAL
+EINVAL
+The
+.Fa fildes
+argument is not associated with a pseudo-terminal manager device.
+.El
+.Sh INTERFACE STABILITY
+.Sy Committed
+.Sh MT LEVEL
+.Sy Safe
+.Sh SEE ALSO
+.Xr open 2 ,
+.Xr grantpt 3C ,
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