Merge head@256284

9 files changed, 187 insertions, 34 deletions

diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc
index 4cc87ae27860..ac5907b82540 100644
--- a/lib/libc/sys/Makefile.inc
+++ b/lib/libc/sys/Makefile.inc
@@ -197,6 +197,7 @@ MAN+=	abort2.2 \
 	posix_fadvise.2 \
 	posix_fallocate.2 \
 	posix_openpt.2 \
+	procctl.2 \
 	profil.2 \
 	pselect.2 \
 	ptrace.2 \
diff --git a/lib/libc/sys/Symbol.map b/lib/libc/sys/Symbol.map
index 222f5f0811f5..fe887c3ddd57 100644
--- a/lib/libc/sys/Symbol.map
+++ b/lib/libc/sys/Symbol.map
@@ -395,6 +395,7 @@ FBSD_1.3 {
 	ffclock_setestimate;
 	pipe2;
 	posix_fadvise;
+	procctl;
 	wait6;
 };
 
@@ -822,6 +823,8 @@ FBSDprivate_1.0 {
 	__sys_poll;
 	_preadv;
 	__sys_preadv;
+	_procctl;
+	__sys_procctl;
 	_profil;
 	__sys_profil;
 	_pselect;
diff --git a/lib/libc/sys/accept.2 b/lib/libc/sys/accept.2
index 76fb463a1ef2..7b8422a05527 100644
--- a/lib/libc/sys/accept.2
+++ b/lib/libc/sys/accept.2
@@ -28,7 +28,7 @@
 .\"     @(#)accept.2	8.2 (Berkeley) 12/11/93
 .\" $FreeBSD$
 .\"
-.Dd May 1, 2013
+.Dd October 1, 2013
 .Dt ACCEPT 2
 .Os
 .Sh NAME
@@ -155,13 +155,20 @@ For some applications, performance may be enhanced by using an
 .Xr accept_filter 9
 to pre-process incoming connections.
 .Pp
-Portable programs should not rely on the
+When using
+.Fn accept ,
+portable programs should not rely on the
 .Dv O_NONBLOCK
 and
 .Dv O_ASYNC
 properties and the signal destination being inherited,
 but should set them explicitly using
-.Xr fcntl 2 .
+.Xr fcntl 2 ;
+.Fn accept4
+sets these properties consistently,
+but may not be fully portable across
+.Ux
+platforms.
 .Sh RETURN VALUES
 These calls return \-1 on error.
 If they succeed, they return a non-negative
diff --git a/lib/libc/sys/close.2 b/lib/libc/sys/close.2
index c3a09725e34c..6df4500643be 100644
--- a/lib/libc/sys/close.2
+++ b/lib/libc/sys/close.2
@@ -28,7 +28,7 @@
 .\"     @(#)close.2	8.2 (Berkeley) 4/19/94
 .\" $FreeBSD$
 .\"
-.Dd January 22, 2012
+.Dd September 11, 2013
 .Dt CLOSE 2
 .Os
 .Sh NAME
@@ -39,7 +39,7 @@
 .Sh SYNOPSIS
 .In unistd.h
 .Ft int
-.Fn close "int d"
+.Fn close "int fd"
 .Sh DESCRIPTION
 The
 .Fn close
@@ -107,7 +107,7 @@ system call will fail if:
 .Bl -tag -width Er
 .It Bq Er EBADF
 The
-.Fa d
+.Fa fd
 argument
 is not an active descriptor.
 .It Bq Er EINTR
diff --git a/lib/libc/sys/ioctl.2 b/lib/libc/sys/ioctl.2
index bab7b4794b78..81500a938ac9 100644
--- a/lib/libc/sys/ioctl.2
+++ b/lib/libc/sys/ioctl.2
@@ -29,7 +29,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd May 11, 2010
+.Dd September 11, 2013
 .Dt IOCTL 2
 .Os
 .Sh NAME
@@ -40,7 +40,7 @@
 .Sh SYNOPSIS
 .In sys/ioctl.h
 .Ft int
-.Fn ioctl "int d" "unsigned long request" ...
+.Fn ioctl "int fd" "unsigned long request" ...
 .Sh DESCRIPTION
 The
 .Fn ioctl
@@ -51,7 +51,7 @@ may be controlled with
 .Fn ioctl
 requests.
 The argument
-.Fa d
+.Fa fd
 must be an open file descriptor.
 .Pp
 The third argument to
@@ -116,19 +116,19 @@ will fail if:
 .Bl -tag -width Er
 .It Bq Er EBADF
 The
-.Fa d
+.Fa fd
 argument
 is not a valid descriptor.
 .It Bq Er ENOTTY
 The
-.Fa d
+.Fa fd
 argument
 is not associated with a character
 special device.
 .It Bq Er ENOTTY
 The specified request does not apply to the kind
 of object that the descriptor
-.Fa d
+.Fa fd
 references.
 .It Bq Er EINVAL
 The
diff --git a/lib/libc/sys/procctl.2 b/lib/libc/sys/procctl.2
new file mode 100644
index 000000000000..32bf34d6a1dd
--- /dev/null
+++ b/lib/libc/sys/procctl.2
@@ -0,0 +1,142 @@
+.\" Copyright (c) 2013 Advanced Computing Technologies LLC
+.\" Written by: John H. Baldwin <jhb@FreeBSD.org>
+.\" All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in the
+.\"    documentation and/or other materials provided with the distribution.
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+.\" ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
+.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+.\" SUCH DAMAGE.
+.\"
+.\" $FreeBSD$
+.\"
+.Dd September 19, 2013
+.Dt PROCCTL 2
+.Os
+.Sh NAME
+.Nm procctl
+.Nd control processes
+.Sh LIBRARY
+.Lb libc
+.Sh SYNOPSIS
+.In sys/procctl.h
+.Ft int
+.Fn procctl "idtype_t idtype" "id_t id" "int cmd" "void *arg"
+.Sh DESCRIPTION
+The
+.Fn procctl
+system call provides for control over processes.
+The
+.Fa idtype
+and
+.Fa id
+arguments specify the set of processes to control.
+If multiple processes match the identifier,
+.Nm
+will make a
+.Dq best effort
+to control as many of the selected possibles as possible.
+An error is only returned if no selected processes successfully complete
+the request.
+The following identifier types are supported:
+.Bl -tag -width "Dv P_PGID"
+.It Dv P_PID
+Control the process with the process ID
+.Fa id .
+.It Dv P_PGID
+Control processes belonging to the process group with the ID
+.Fa id .
+.El
+.Pp
+The control request to perform is specified by the
+.Fa cmd
+argument.
+The following commands are supported:
+.Bl -tag -width "Dv PROC_SPROTECT"
+.It Dv PROC_SPROTECT
+Set process protection state.
+This is used to mark a process as protected from being killed if the system
+exhausts available memory and swap.
+The
+.Fa arg
+parameter must point to an integer containing an operation and zero or more
+optional flags.
+The following operations are supported:
+.Bl -tag -width "Dv PPROT_CLEAR"
+.It Dv PPROT_SET
+Mark the selected processes as protected.
+.It Dv PPROT_CLEAR
+Clear the protected state of selected processes.
+.El
+.Pp
+The following optional flags are supported:
+.Bl -tag -width "Dv PPROT_DESCE"
+.It Dv PPROT_DESCEND
+Apply the requested operation to all child processes of each selected process
+in addition to each selected process.
+.It Dv PPROT_INHERIT
+When used with
+.Dv PPROT_SET ,
+mark all future child processes of each selected process as protected.
+Future child processes will also mark all of their future child processes.
+.El
+.El
+.Sh RETURN VALUES
+If an error occurs, a value of -1 is returned and
+.Va errno
+is set to indicate the error.
+.Sh ERRORS
+The
+.Fn procctl
+system call
+will fail if:
+.Bl -tag -width Er
+.It Bq Er EFAULT
+The
+.Fa arg
+points outside the process's allocated address space.
+.It Bq Er EINVAL
+The
+.Fa cmd
+argument specifies an unsupported command.
+.Pp
+The
+.Fa idtype
+argument specifies an unsupported identifier type.
+.It Bq Er EPERM
+The calling process does not have permission to perform the requested
+operation on any of the selected processes.
+.It Bq Er ESRCH
+No processes matched the requested
+.Fa idtype
+and
+.Fa id .
+.It Bq Er EINVAL
+An invalid operation or flag was passed in
+.Fa arg
+for a
+.Dv PROC_SPROTECT
+command.
+.El
+.Sh SEE ALSO
+.Xr ptrace 2
+.Sh HISTORY
+The
+.Fn procctl
+function appeared in
+.Fx 10 .
diff --git a/lib/libc/sys/read.2 b/lib/libc/sys/read.2
index 2127eda3990e..e99665fa6b2f 100644
--- a/lib/libc/sys/read.2
+++ b/lib/libc/sys/read.2
@@ -28,7 +28,7 @@
 .\"     @(#)read.2	8.4 (Berkeley) 2/26/94
 .\" $FreeBSD$
 .\"
-.Dd January 22, 2012
+.Dd September 11, 2013
 .Dt READ 2
 .Os
 .Sh NAME
@@ -43,14 +43,14 @@
 .In sys/types.h
 .In unistd.h
 .Ft ssize_t
-.Fn read "int d" "void *buf" "size_t nbytes"
+.Fn read "int fd" "void *buf" "size_t nbytes"
 .Ft ssize_t
-.Fn pread "int d" "void *buf" "size_t nbytes" "off_t offset"
+.Fn pread "int fd" "void *buf" "size_t nbytes" "off_t offset"
 .In sys/uio.h
 .Ft ssize_t
-.Fn readv "int d" "const struct iovec *iov" "int iovcnt"
+.Fn readv "int fd" "const struct iovec *iov" "int iovcnt"
 .Ft ssize_t
-.Fn preadv "int d" "const struct iovec *iov" "int iovcnt" "off_t offset"
+.Fn preadv "int fd" "const struct iovec *iov" "int iovcnt" "off_t offset"
 .Sh DESCRIPTION
 The
 .Fn read
@@ -58,7 +58,7 @@ system call
 attempts to read
 .Fa nbytes
 of data from the object referenced by the descriptor
-.Fa d
+.Fa fd
 into the buffer pointed to by
 .Fa buf .
 The
@@ -107,7 +107,7 @@ On objects capable of seeking, the
 .Fn read
 starts at a position
 given by the pointer associated with
-.Fa d
+.Fa fd
 (see
 .Xr lseek 2 ) .
 Upon return from
@@ -149,12 +149,12 @@ will succeed unless:
 .Bl -tag -width Er
 .It Bq Er EBADF
 The
-.Fa d
+.Fa fd
 argument
 is not a valid file or socket descriptor open for reading.
 .It Bq Er ECONNRESET
 The
-.Fa d
+.Fa fd
 argument refers to a socket, and the remote socket end is
 forcibly closed.
 .It Bq Er EFAULT
@@ -173,7 +173,7 @@ was interrupted by the delivery of a signal
 before any data arrived.
 .It Bq Er EINVAL
 The pointer associated with
-.Fa d
+.Fa fd
 was negative.
 .It Bq Er EAGAIN
 The file was marked for non-blocking I/O,
diff --git a/lib/libc/sys/socketpair.2 b/lib/libc/sys/socketpair.2
index 08d00d3c0e5f..d3a47ebb2318 100644
--- a/lib/libc/sys/socketpair.2
+++ b/lib/libc/sys/socketpair.2
@@ -28,7 +28,7 @@
 .\"     @(#)socketpair.2	8.1 (Berkeley) 6/4/93
 .\" $FreeBSD$
 .\"
-.Dd March 19, 2013
+.Dd September 11, 2013
 .Dt SOCKETPAIR 2
 .Os
 .Sh NAME
@@ -40,13 +40,13 @@
 .In sys/types.h
 .In sys/socket.h
 .Ft int
-.Fn socketpair "int d" "int type" "int protocol" "int *sv"
+.Fn socketpair "int fd" "int type" "int protocol" "int *sv"
 .Sh DESCRIPTION
 The
 .Fn socketpair
 system call creates an unnamed pair of connected sockets in
 the specified domain
-.Fa d ,
+.Fa fd ,
 of the specified
 .Fa type ,
 and using the optionally specified
diff --git a/lib/libc/sys/write.2 b/lib/libc/sys/write.2
index d22b9854efe3..a06e7c9d89f6 100644
--- a/lib/libc/sys/write.2
+++ b/lib/libc/sys/write.2
@@ -28,7 +28,7 @@
 .\"     @(#)write.2	8.5 (Berkeley) 4/2/94
 .\" $FreeBSD$
 .\"
-.Dd January 22, 2012
+.Dd September 11, 2013
 .Dt WRITE 2
 .Os
 .Sh NAME
@@ -43,14 +43,14 @@
 .In sys/types.h
 .In unistd.h
 .Ft ssize_t
-.Fn write "int d" "const void *buf" "size_t nbytes"
+.Fn write "int fd" "const void *buf" "size_t nbytes"
 .Ft ssize_t
-.Fn pwrite "int d" "const void *buf" "size_t nbytes" "off_t offset"
+.Fn pwrite "int fd" "const void *buf" "size_t nbytes" "off_t offset"
 .In sys/uio.h
 .Ft ssize_t
-.Fn writev "int d" "const struct iovec *iov" "int iovcnt"
+.Fn writev "int fd" "const struct iovec *iov" "int iovcnt"
 .Ft ssize_t
-.Fn pwritev "int d" "const struct iovec *iov" "int iovcnt" "off_t offset"
+.Fn pwritev "int fd" "const struct iovec *iov" "int iovcnt" "off_t offset"
 .Sh DESCRIPTION
 The
 .Fn write
@@ -58,7 +58,7 @@ system call
 attempts to write
 .Fa nbytes
 of data to the object referenced by the descriptor
-.Fa d
+.Fa fd
 from the buffer pointed to by
 .Fa buf .
 The
@@ -107,7 +107,7 @@ On objects capable of seeking, the
 .Fn write
 starts at a position
 given by the pointer associated with
-.Fa d ,
+.Fa fd ,
 see
 .Xr lseek 2 .
 Upon return from
@@ -154,7 +154,7 @@ will fail and the file pointer will remain unchanged if:
 .Bl -tag -width Er
 .It Bq Er EBADF
 The
-.Fa d
+.Fa fd
 argument
 is not a valid descriptor open for writing.
 .It Bq Er EPIPE
@@ -174,7 +174,7 @@ or data to be written to the file
 points outside the process's allocated address space.
 .It Bq Er EINVAL
 The pointer associated with
-.Fa d
+.Fa fd
 was negative.
 .It Bq Er ENOSPC
 There is no free space remaining on the file system