Finish _POSIX_PRIORITY_SCHEDULING. Needs P1003_1B and

_KPOSIX_PRIORITY_SCHEDULING options to work.  Changes:

Change all "posix4" to "p1003_1b".  Misnamed files are left
as "posix4" until I'm told if I can simply delete them and add
new ones;

Add _POSIX_PRIORITY_SCHEDULING system calls for FreeBSD and Linux;

Add man pages for _POSIX_PRIORITY_SCHEDULING system calls;

Add options to LINT;

Minor fixes to P1003_1B code during testing.

5 files changed, 532 insertions, 1 deletions

diff --git a/lib/libc/sys/Makefile.inc b/lib/libc/sys/Makefile.inc
index 630b025..d36a7a2 100644
--- a/lib/libc/sys/Makefile.inc
+++ b/lib/libc/sys/Makefile.inc
@@ -1,5 +1,5 @@
 #	@(#)Makefile.inc	8.3 (Berkeley) 10/24/94
-#	$Id: Makefile.inc,v 1.48 1998/03/23 06:58:06 jb Exp $
+#	$Id: Makefile.inc,v 1.49 1998/03/23 21:04:06 jb Exp $
 
 # sys sources
 .PATH: ${.CURDIR}/../libc/${MACHINE_ARCH}/sys ${.CURDIR}/../libc/sys
@@ -100,6 +100,12 @@ MAN2+=	_exit.2 accept.2 access.2 acct.2 adjtime.2 \
 	swapon.2 symlink.2 sync.2 syscall.2 truncate.2 umask.2 undelete.2 \
 	unlink.2 utimes.2 vfork.2 wait.2 write.2
 
+.if !defined(NO_P1003_1B)
+MAN2+=	sched_get_priority_max.2 sched_setscheduler.2 \
+	sched_setparam.2 sched_yield.2
+.endif
+
+
 MLINKS+=brk.2 sbrk.2
 MLINKS+=dup.2 dup2.2
 MLINKS+=chdir.2 fchdir.2
@@ -135,4 +141,10 @@ MLINKS+=syscall.2 __syscall.2
 MLINKS+=truncate.2 ftruncate.2
 MLINKS+=wait.2 wait3.2 wait.2 wait4.2 wait.2 waitpid.2
 MLINKS+=write.2 writev.2
+.if !defined(NO_P1003_1B)
+MLINKS+=sched_get_priority_max.2 sched_get_priority_min.2 \
+	sched_get_priority_max.2 sched_rr_get_interval.2
+MLINKS+=sched_setscheduler.2 sched_getscheduler.2
+MLINKS+=sched_setparam.2 sched_getparam.2
+.endif
 .endif
diff --git a/lib/libc/sys/sched_get_priority_max.2 b/lib/libc/sys/sched_get_priority_max.2
new file mode 100644
index 0000000..2b9fa59
--- /dev/null
+++ b/lib/libc/sys/sched_get_priority_max.2
@@ -0,0 +1,121 @@
+.\"	$Id:$
+.\" Copyright (c) 1998 HD Associates, Inc.
+.\" 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.
+.\"
+.Dd Mar 12, 1998
+.Dt SCHED_GET_PRIORITY_MAX 2
+.Os BSD 4
+.Sh NAME
+.Nm sched_get_priority_max ,
+.Nm sched_get_priority_min ,
+.Nm sched_rr_get_interval
+.Nd Get scheduling parameter limits
+.Sh SYNOPSIS
+.Fd #include <sched.h>
+.Ft int
+.Fn sched_get_priority_max "int policy"
+.Ft int
+.Fn sched_get_priority_min "int policy"
+.Ft int
+.Fn sched_rr_get_interval "pid_t pid" "struct timespec *interval"
+.Sh DESCRIPTION
+The
+.Fn sched_get_priority_max
+and
+.Fn sched_get_priority_min
+functions return the appropriate maximum or minimum, respectfully,
+for the scheduling policy specified by policy.  The
+.Fn sched_rr_get_interval
+function updates the
+.Fa timespec
+structure referenced by the
+.Fa interval
+argument to contain the current execution time limit (i.e., time
+quantum) for the process specified by
+.Fa pid .
+If
+.Fa pid
+is zero, the current execution time limit for the calling process is
+returned.
+.Pp
+The value of
+.Fa policy
+should be one of the scheduling policy values defined in
+.Fa <sched.h> :
+.Bl -tag -width [SCHED_OTHER]
+.It Bq Er SCHED_FIFO
+First-in-first-out fixed priority scheduling with no round robin scheduling;
+.It Bq Er SCHED_OTHER
+The standard time sharing scheduler;
+.It Bq Er SCHED_RR
+Round-robin scheduling across same priority processes.
+.El
+.Sh RETURN
+If successful, the
+.Fn sched_get_priority_max
+and
+.Fn sched_get_priority_min
+functions shall return the appropriate maximum or minimum values,
+respectively.  If unsuccessful, the shall return a value of -1 and set
+.Fa errno
+to indicate the error.
+.Pp
+If successful, the
+.Fn sched_rr_get_interval
+function will return 0.  Otherwise, it will
+return a value of -1 and set
+.Fa errno
+to indicate the error.
+.Sh ERRORS
+On failure
+.Va errno
+will be set to the corresponding value:
+.Bl -tag -width [EFAULT]
+.It Bq Er EINVAL
+The value of the
+.Fa policy
+parameter does not represent a defined scheduling policy.
+.It Bq Er ENOSYS
+The
+.Fn sched_get_priority_max ,
+.Fn sched_get_priority_min ,
+and
+.Fn sched_rr_get_interval
+functions are not supported by the implementation.
+.It Bq Er ESRCH
+No process can be found corresponding to that specified by
+.Fa pid .
+.El
+.Sh SEE ALSO
+.Xr sched_getparam 2 ,
+.Xr sched_setparam 2 ,
+.Xr sched_get_scheduler 2 ,
+.Xr sched_set_scheduler 2
+.Sh STANDARDS
+The
+.Fn sched_setscheduler 
+and
+.Fn sched_getscheduler
+functions conform to
+.St -p1003.1b-93 .
diff --git a/lib/libc/sys/sched_setparam.2 b/lib/libc/sys/sched_setparam.2
new file mode 100644
index 0000000..5bbd760
--- /dev/null
+++ b/lib/libc/sys/sched_setparam.2
@@ -0,0 +1,172 @@
+.\"	$Id:$
+.\" Copyright (c) 1998 HD Associates, Inc.
+.\" 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.
+.\"
+.Dd Mar 12, 1998
+.Dt SCHED_SETPARAM 2
+.Os BSD 4
+.Sh NAME
+.Nm sched_setparam ,
+.Nm sched_getparam
+.Nd set/get scheduling paramaters
+.Sh SYNOPSIS
+.Fd #include <sched.h>
+.Ft int
+.Fn sched_setparam "pid_t pid" "const struct sched_param *param"
+.Ft int
+.Fn sched_getparam "pid_t pid" "struct sched_param *param"
+.Sh DESCRIPTION
+The
+.Fn sched_setparam
+function sets the scheduling parameters of the process specified by
+.Fa pid
+to the values specified by the
+.Fa sched_param
+structure pointed to by
+.Fa param .
+The value of the
+.Fa sched_priority
+member in the
+.Fa param
+structure must be any integer within the inclusive priority range for
+the current scheduling policy of the process specified by
+.Fa pid .
+Higher numerical values for the priority represent higher priorities.
+.Pp
+In this implementation, if the value of
+.Fa pid
+is negative the function will fail.
+.Pp
+If a process specified by
+.Fa pid
+exists and if the calling process has permission, the scheduling
+parameters are set for the process whose process ID is equal to
+.Fa pid .
+.Pp
+If
+.Fa pid
+is zero, the scheduling parameters are set for the calling process.
+.Pp
+In this implementation, the policy of when a process can affect
+the scheduling parameters of another process is specified in
+.Xr p1003_1b
+as a write-style operation.
+.Pp
+The target process, whether it is running or not running, will resume
+execution after all other runnable processes of equal or greater
+priority have been scheduled to run.
+.Pp
+If the priority of the process specified by the
+.Fa pid
+argument is set higher than that of the lowest priority running process
+and if the specified process is ready to run, the process specified by
+the
+.Fa pid
+argument will preempt a lowest priority running process.  Similarly, if
+the process calling
+.Fn sched_setparam
+sets its own priority lower than that of one or more other nonempty
+process lists, then the process that is the head of the highest priority
+list will also preempt the calling process.  Thus, in either case, the
+originating process might not receive notification of the completion of
+the requested priority change until the higher priority process has
+executed.
+.Pp
+In this implementation, when the current scheduling policy for the
+process specified by
+.Fa pid
+is normal timesharing (SCHED_OTHER, aka SCHED_NORMAL when not POSIX-source)
+or the idle policy (SCHED_IDLE when not POSIX-source) then the behavior
+is as if the process had been running under SCHED_RR with a priority
+lower than any actual realtime priority.
+.Pp
+The
+.Fn sched_getparam
+function will return the scheduling parameters of a process specified
+by
+.Fa pid
+in the
+.Fa sched_param
+structure pointed to by
+.Fa param .
+.Pp
+If a process specified by
+.Fa pid
+exists and if the calling process has permission,
+the scheduling parameters for the process whose process ID is equal to
+.Fa pid
+are returned.
+.Pp
+In this implementation, the policy of when a process can obtain the
+scheduling parameters of another process are detailed in
+.Xr p1003_1b
+as a read-style operation.
+.Pp
+If
+.Fa pid
+is zero, the scheduling parameters for the calling process will be
+returned.  In this implementation, the
+.Fa sched_getparam
+function will fail if
+.Fa pid
+is negative.
+.Sh RETURN
+The function will return zero if it completes successfully, or it
+will return a value of -1 and set
+.Va errno
+to indicate the error.
+.Sh ERRORS
+On failure
+.Va errno
+will be set to the corresponding value:
+.Bl -tag -width [EFAULT]
+.It Bq Er ENOSYS
+The system is not configured to support this functionality.
+.It Bq Er EPERM
+The requesting process doesn not have permission as detailed in
+.Xr p1003_1b .
+.It Bq Er ESRCH
+No process can be found corresponding to that specified by
+.Fa pid .
+.It Bq Er EINVAL
+For
+.Fn sched_setparam :
+one or more of the requested scheduling parameters
+is outside the range defined for the scheduling policy of the specified
+.Fa pid .
+.El
+.Sh SEE ALSO
+.Xr sched_getscheduler 2 ,
+.Xr sched_setscheduler 2 ,
+.Xr sched_get_priority_max 2 ,
+.Xr sched_get_priority_min 2 ,
+.Xr sched_rr_get_interval 2 ,
+.Xr sched_yield 2
+.Sh STANDARDS
+The
+.Fn sched_setparam 
+and
+.Fn sched_getparam
+functions conform to
+.St -p1003.1b-93 .
diff --git a/lib/libc/sys/sched_setscheduler.2 b/lib/libc/sys/sched_setscheduler.2
new file mode 100644
index 0000000..7635bfe
--- /dev/null
+++ b/lib/libc/sys/sched_setscheduler.2
@@ -0,0 +1,167 @@
+.\"	$Id:$
+.\" Copyright (c) 1998 HD Associates, Inc.
+.\" 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.
+.\"
+.Dd Mar 12, 1998
+.Dt SCHED_SETSCHEDULER 2
+.Os BSD 4
+.Sh NAME
+.Nm sched_setscheduler ,
+.Nm sched_getscheduler
+.Nd set/get scheduling policy and scheduler parameters
+.Sh SYNOPSIS
+.Fd #include <sched.h>
+.Ft int
+.Fn sched_setscheduler "pid_t pid" "int policy" "const struct sched_param *param"
+.Ft int
+.Fn sched_getscheduler "pid_t pid"
+.Sh DESCRIPTION
+The
+.Fn sched_setscheduler
+function sets the scheduling policy and scheduling parameters
+of the process specified by
+.Fa pid
+to
+.Fa policy
+and the parameters specified in the
+.Fa sched_param
+structure pointed to by
+.Fa param ,
+respectively.
+The value of the
+.Fa sched_priority
+member in the
+.Fa param
+structure must be any integer within the inclusive priority range for
+the scheduling policy specified by
+.Fa policy .
+.Pp
+In this implementation, if the value of
+.Fa pid
+is negative the function will fail.
+.Pp
+If a process specified by
+.Fa pid
+exists and if the calling process has permission, the scheduling
+policy and scheduling parameters will be set for the process
+whose process ID is equal to
+.Fa pid .
+.Pp
+If
+.Fa pid
+is zero, the scheduling policy and scheduling
+parameters are set for the calling process.
+.Pp
+In this implementation, the policy of when a process can affect
+the scheduling parameters of another process is specified in
+.Xr p1003_1b
+as a write-style operation.
+.Pp
+The scheduling policies are in
+.Fa <sched.h> :
+.Bl -tag -width [SCHED_OTHER]
+.It Bq Er SCHED_FIFO
+First-in-first-out fixed priority scheduling with no round robin scheduling;
+.It Bq Er SCHED_OTHER
+The standard time sharing scheduler;
+.It Bq Er SCHED_RR
+Round-robin scheduling across same priority processes.
+.El
+.Pp
+The
+.Fa sched_param
+structure is defined in
+.Fa <sched.h> :
+
+.Bd -literal -offset indent
+struct sched_param {
+	int sched_priority;	/* scheduling priority */
+};
+.Ed
+.Pp
+The
+.Fn sched_getscheduler
+function returns the scheduling policy of the process specified
+by
+.Fa pid .
+.Pp
+If a process specified by
+.Fa pid
+exists and if the calling process has permission,
+the scheduling parameters for the process whose process ID is equal to
+.Fa pid
+are returned.
+.Pp
+In this implementation, the policy of when a process can obtain the
+scheduling parameters of another process are detailed in
+.Xr p1003_1b
+as a read-style operation.
+.Pp
+If
+.Fa pid
+is zero, the scheduling parameters for the calling process will be
+returned.  In this implementation, the
+.Fa sched_getscheduler
+function will fail if
+.Fa pid
+is negative.
+.Sh RETURN
+The function will return zero if it completes successfully, or it
+will return a value of -1 and set
+.Va errno
+to indicate the error.
+.Sh ERRORS
+On failure
+.Va errno
+will be set to the corresponding value:
+.Bl -tag -width [EFAULT]
+.It Bq Er ENOSYS
+The system is not configured to support this functionality.
+.It Bq Er EPERM
+The requesting process doesn not have permission as detailed in
+.Xr p1003_1b .
+.It Bq Er ESRCH
+No process can be found corresponding to that specified by
+.Fa pid .
+.It Bq Er EINVAL
+The value of the
+.Fa policy
+parameter is invalid, or one or more of the parameters contained in
+.Fa param
+is outside the valid range for the specified scheduling policy.
+.El
+.Sh SEE ALSO
+.Xr sched_getparam 2 ,
+.Xr sched_setparam 2 ,
+.Xr sched_get_priority_max 2 ,
+.Xr sched_get_priority_min 2 ,
+.Xr sched_rr_get_interval 2 ,
+.Xr sched_yield 2
+.Sh STANDARDS
+The
+.Fn sched_setscheduler 
+and
+.Fn sched_getscheduler
+functions conform to
+.St -p1003.1b-93 .
diff --git a/lib/libc/sys/sched_yield.2 b/lib/libc/sys/sched_yield.2
new file mode 100644
index 0000000..b4ea28c
--- /dev/null
+++ b/lib/libc/sys/sched_yield.2
@@ -0,0 +1,59 @@
+.\"	$Id:$
+.\" Copyright (c) 1998 HD Associates, Inc.
+.\" 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.
+.\"
+.Dd Mar 12, 1998
+.Dt SCHED_YIELD 2
+.Os BSD 4
+.Sh NAME
+.Nm sched_yield
+.Nd yield processor
+.Sh SYNOPSIS
+.Fd #include <sched.h>
+.Ft int
+.Fn sched_yield void
+.Sh DESCRIPTION
+The
+.Fn sched_yield
+function forces the running process to relinquish the processor until it
+again becomes the head of its process list.  It takes no arguments.
+.Sh RETURN
+The 
+.Fn sched_yield
+function will return zero if it completes successfully, or it
+will return a value of -1 and set
+.Va errno
+to indicate the error.
+.Sh ERRORS
+On failure
+.Va errno
+will be set to the corresponding value:
+.Bl -tag -width [EFAULT]
+.It Bq Er ENOSYS
+The system is not configured to support this functionality.
+.Sh STANDARDS
+The
+.Fn sched_yield 
+function conforms to
+.St -p1003.1b-93 .