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kevent: Add precision and abstimer flags for EVFILT_TIMER

Add timer precision flags NOTE_SECONDS, NOTE_MSECONDS, NOTE_USECONDS
and NOTE_NSECONDS for EVFILT_TIMER. Also, add an initial implementation
of NOTE_ABSTIME timers.

Similar kevent(2) flags exist on FreeBSD, NetBSD and XNU.

Initial diff by and OK aisha@
OK mpi@

#!/bin/sh
# $OpenBSD: mksubr,v 1.40 2023/08/13 08:29:28 visa Exp $
#
# Copyright (c) 2006 David Kirchner <dpk@dpk.net>
#
# Permission to use, copy, modify, and distribute this software for any
# purpose with or without fee is hereby granted, provided that the above
# copyright notice and this permission notice appear in all copies.
#
# THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
# WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
# MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
# ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
# WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
# ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
# OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
#
# $FreeBSD: src/usr.bin/kdump/mksubr,v 1.17 2011/06/06 19:00:38 dchagin Exp $
#
# Generates kdump_subr.c
# mkioctls is a special-purpose script, and works fine as it is
# now, so it remains independent. The idea behind how it generates
# its list was heavily borrowed here.
#
# Some functions here are automatically generated. This can mean
# the user will see unusual kdump output or errors while building
# if the underlying .h files are changed significantly.
#
# Key:
# AUTO: Completely auto-generated with either the "or" or the "switch"
# method.
# AUTO - Special: Generated automatically, but with some extra commands
# that the auto_*_type() functions are inappropriate for.
# MANUAL: Manually entered and must therefore be manually updated.

set -e

LC_ALL=C; export LC_ALL

if [ -z "$1" ]
then
	echo "usage: sh $0 include-dir"
	exit 1
fi
include_dir=$1

#
# Automatically generates a C function that will print out the
# numeric input as a pipe-delimited string of the appropriate
# #define keys. ex:
# 0x1a4<S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH>
# The XOR is necessary to prevent including the "0"-value in every
# line.
#
auto_or_type () {
	local name grep file
	name=$1
	grep=$2
	file=$3
	format=${4-%#x}

	cat <<_EOF_
/* AUTO */
void
$name (int arg)
{
	int	or = 0;
	printf("$format<", arg);
_EOF_
	egrep "^#[[:space:]]*define[[:space:]]+"${grep}"[[:space:]]*" \
		$include_dir/$file | \
	awk '{ for (i = 1; i <= NF; i++) \
		if ($i ~ /define/) \
			break; \
		++i; \
		printf "\tif(!((arg>0)^((%s)>0)))\n\t\tif_print_or(arg, %s, or);\n", $i, $i }'
cat <<_EOF_
	printf(">");
	if (or == 0)
		(void)printf("<invalid>%d", arg);
}

_EOF_
}

#
# Like auto_or_type(), but a zero value is valid and prints as "0<>"
#
auto_orz_type () {
	local name grep file
	name=$1
	grep=$2
	file=$3
	format=${4-%#x}

	cat <<_EOF_
/* AUTO */
void
$name (int arg)
{
	int	or = 0;
	if (arg == 0) {
		printf("0<>");
		return;
	}
	printf("$format<", arg);
_EOF_
	egrep "^#[[:space:]]*define[[:space:]]+"${grep}"[[:space:]]*" \
		$include_dir/$file | \
	awk '{ for (i = 1; i <= NF; i++) \
		if ($i ~ /define/) \
			break; \
		++i; \
		printf "\tif(!((arg>0)^((%s)>0)))\n\t\tif_print_or(arg, %s, or);\n", $i, $i }'
cat <<_EOF_
	printf(">");
	if (or == 0)
		(void)printf("<invalid>%d", arg);
}

_EOF_
}

#
# Automatically generates a C function that will print out a
# file flags input as a pipe-delimited string of the appropriate
# #define keys. ex:
# 0x30000<O_RDONLY|O_CLOEXEC|O_DIRECTORY>
# This is different than the others to handle O_RDONLY correctly when
# other flags are present and to diagnose an invalid O_ACCMODE value
#
auto_fflags_type () {
	local name grep file
	name=$1
	grep=$2
	file=$3

	cat <<_EOF_
/* AUTO */
void
$name (int arg, int show_accmode)
{
	int	or = 0;

	printf("%#x<", arg);
	if (show_accmode || (arg & O_ACCMODE)) {
		or = 1;
		switch (arg & O_ACCMODE) {
		case O_RDONLY:
			printf("O_RDONLY");
			break;
		case O_WRONLY:
			printf("O_WRONLY");
			break;
		case O_RDWR:
			printf("O_RDWR");
			break;
		default:
			printf("<invalid>O_ACCMODE");
			break;
		}
	}
_EOF_
	egrep "^#[[:space:]]*define[[:space:]]+"${grep}"[[:space:]]*" \
		$include_dir/$file | \
	egrep -v 'O_(RD(ONLY|WR)|WRONLY|ACCMODE)' | \
	awk '{ for (i = 1; i <= NF; i++) \
		if ($i ~ /define/) \
			break; \
		++i; \
		printf "\tif_print_or(arg, %s, or);\n", $i }'
cat <<_EOF_
	printf(">");
}

/*
 * Wrappers of the above to use with pn()
 */
void
flagsname(int flags)
{
	doflagsname(flags, 0);
}

void
openflagsname(int flags)
{
	doflagsname(flags, 1);
}


_EOF_
}


#
# Automatically generates a C function used when the argument
# maps to a single, specific #definition
#
auto_switch_type () {
	local name grep file
	name=$1
	grep=$2
	file=$3

	cat <<_EOF_
/* AUTO */
void
$name (int arg)
{
	switch (arg) {
_EOF_
	egrep "^#[[:space:]]*define[[:space:]]+"${grep}"[[:space:]]*" \
		$include_dir/$file | \
	awk '{ for (i = 1; i <= NF; i++) \
		if ($i ~ /define/) \
			break; \
		++i; \
		printf "\tcase %s:\n\t\t(void)printf(\"%s\");\n\t\tbreak;\n", $i, $i }'
cat <<_EOF_
	default: /* Should not reach */
		(void)printf("<invalid=%d>", arg);
	}
}

_EOF_
}

#
# Automatically generates a C function used when the argument
# maps to a #definition
#
auto_if_type () {
	local name grep file
	name=$1
	grep=$2
	file=$3

	cat <<_EOF_
/* AUTO */
void
$name (int arg)
{
_EOF_
	egrep "^#[[:space:]]*define[[:space:]]+"${grep}"[[:space:]]*" \
		$include_dir/$file | \
	awk '{ printf "\t"; \
		if (NR > 1) \
			printf "else " ; \
		printf "if (arg == %s) \n\t\tprintf(\"%s\");\n", $2, $2 }'
cat <<_EOF_
	else /* Should not reach */
		(void)printf("<invalid=%d>", arg);
}

_EOF_
}

# C start

cat <<_EOF_
#include <sys/types.h>
#include <sys/signal.h>
#include <sys/event.h>
#include <sys/fcntl.h>
#include <sys/stat.h>
#include <sys/unistd.h>
#define _KERNEL
#include <sys/mman.h>
#undef _KERNEL
#include <sys/wait.h>
#include <sys/proc.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <sys/mount.h>
#include <sys/poll.h>
#include <sys/ptrace.h>
#include <sys/resource.h>
#include <sys/reboot.h>
#include <sys/uio.h>
#include <sys/ktrace.h>
#include <sched.h>
#if 0
#include <sys/linker.h>
#define _KERNEL
#include <sys/thr.h>
#undef _KERNEL
#include <sys/extattr.h>
#include <sys/acl.h>
#include <aio.h>
#endif
#include <sys/sem.h>
#include <sys/ipc.h>
#if 0
#include <sys/rtprio.h>
#endif
#include <sys/shm.h>
#if 0
#include <nfsserver/nfs.h>
#endif
#include <ufs/ufs/quota.h>
#include <sys/syslog.h>
#include <sys/futex.h>
#include <stdio.h>

#include "kdump_subr.h"

_EOF_

auto_orz_type "modename" "S_[A-Z]+[[:space:]]+[0-6]{7}" "sys/stat.h" "%#o"
auto_fflags_type "doflagsname" "O_[A-Z]+[[:space:]]+0x[0-9A-Fa-f]+" "sys/fcntl.h"
auto_orz_type "atflagsname" "AT_[A-Z_]+[[:space:]]+0x[0-9A-Fa-f]+" "sys/fcntl.h"
auto_or_type "accessmodename" "[A-Z]_OK[[:space:]]+0?x?[0-9A-Fa-f]+" "sys/unistd.h"
auto_or_type "mmapprotname" "PROT_[A-Z]+[[:space:]]+0x[0-9A-Fa-f]+" "sys/mman.h"
auto_or_type "mmapflagsname" "(__)?MAP_[A-Z]+[[:space:]]+0x[0-9A-Fa-f]+" "sys/mman.h"
auto_orz_type "wait4optname" "W(NOHANG|UNTRACED|CONTINUED)[[:space:]]+[0-9]+" "sys/wait.h"
auto_or_type "waitidoptname" "W(NO[A-Z]+|[A-T][A-Z]*ED)[[:space:]]+([0-9]+|W[A-Z]+)" "sys/wait.h"
#auto_or_type "timerflagsname" "TIMER_[A-Z]+[[:space:]]+0x[0-9A-Fa-f]+" "sys/time.h"
#auto_or_type "getfsstatflagsname" "MNT_[A-Z]+[[:space:]]+[1-9][0-9]*" "sys/mount.h"
auto_orz_type "mountflagsname" "MNT_[A-Z]+[[:space:]]+0x[0-9]+" "sys/mount.h"
auto_or_type "rebootoptname" "RB_[A-Z]+[[:space:]]+0x[0-9]+" "sys/reboot.h"
auto_or_type "flockname" "LOCK_[A-Z]+[[:space:]]+0x[0-9]+" "sys/fcntl.h"
#auto_or_type "thrcreateflagsname" "THR_[A-Z]+[[:space:]]+0x[0-9]+" "sys/thr.h"
auto_or_type "mlockallname" "MCL_[A-Z]+[[:space:]]+0x[0-9]+" "sys/mman.h"
auto_orz_type "shmatname" "SHM_[A-Z]+[[:space:]]+[0-9]{6}" "sys/shm.h"
#auto_or_type "nfssvcname" "NFSSVC_[A-Z]+[[:space:]]+0x[0-9]+" "nfsserver/nfs.h"
#
auto_switch_type "whencename" "SEEK_[A-Z]+[[:space:]]+[0-9]+" "sys/unistd.h"
auto_switch_type "pathconfname" "_PC_[_A-Z]+[[:space:]]+[0-9]+" "sys/unistd.h"
auto_switch_type "rlimitname" "RLIMIT_[A-Z]+[[:space:]]+[0-9]+" "sys/resource.h"
auto_switch_type "shutdownhowname" "SHUT_[A-Z]+[[:space:]]+[0-9]+" "sys/socket.h"
auto_switch_type "prioname" "PRIO_[A-Z]+[[:space:]]+[0-9]" "sys/resource.h"
auto_switch_type "madvisebehavname" "MADV_[A-Z]+[[:space:]]+[0-9A-Z_]+" "sys/mman.h"
auto_switch_type "msyncflagsname" "MS_[A-Z]+[[:space:]]+0x[0-9]+" "sys/mman.h"
auto_switch_type "clocktypename" "CLOCK_[_A-Z]+[[:space:]]+[0-9]+" "sys/_time.h"
#auto_switch_type "schedpolicyname" "SCHED_[A-Z]+[[:space:]]+[0-9]+" "sched.h"
#auto_switch_type "kldunloadfflagsname" "LINKER_UNLOAD_[A-Z]+[[:space:]]+[0-9]+" "sys/linker.h"
#auto_switch_type "extattrctlname" "EXTATTR_NAMESPACE_[A-Z]+[[:space:]]+0x[0-9]+" "sys/extattr.h"
#auto_switch_type "kldsymcmdname" "KLDSYM_[A-Z]+[[:space:]]+[0-9]+" "sys/linker.h"
#auto_switch_type "sendfileflagsname" "SF_[A-Z]+[[:space:]]+[0-9]+" "sys/socket.h"
#auto_switch_type "acltypename" "ACL_TYPE_[A-Z4_]+[[:space:]]+0x[0-9]+" "sys/acl.h"
auto_switch_type "rusagewho" "RUSAGE_[A-Z]+[[:space:]]+[-0-9()]+" "sys/resource.h"
auto_orz_type "sigactionflagname" "SA_[A-Z]+[[:space:]]+0x[0-9]+" "sys/signal.h"
auto_switch_type "sigprocmaskhowname" "SIG_[A-Z]+[[:space:]]+[0-9]+" "sys/signal.h"
auto_switch_type "sigill_name" "ILL_[A-Z]+[[:space:]]+[0-9]+" "sys/siginfo.h"
auto_switch_type "sigtrap_name" "TRAP_[A-Z]+[[:space:]]+[0-9]+" "sys/siginfo.h"
auto_switch_type "sigemt_name" "EMT_[A-Z]+[[:space:]]+[0-9]+" "sys/siginfo.h"
auto_switch_type "sigfpe_name" "FPE_[A-Z]+[[:space:]]+[0-9]+" "sys/siginfo.h"
auto_switch_type "sigbus_name" "BUS_[A-Z]+[[:space:]]+[0-9]+" "sys/siginfo.h"
auto_switch_type "sigsegv_name" "SEGV_[A-Z]+[[:space:]]+[0-9]+" "sys/siginfo.h"
auto_switch_type "sigchld_name" "CLD_[A-Z]+[[:space:]]+[0-9]+" "sys/siginfo.h"
#auto_switch_type "lio_listioname" "LIO_(NO)?WAIT[[:space:]]+[0-9]+" "aio.h"
auto_switch_type "minheritname" "MAP_INHERIT_[A-Z]+[[:space:]]+[0-9]+" "sys/mman.h"
auto_switch_type "quotactlname" "Q_[A-Z]+[[:space:]]+0x[0-9]+" "ufs/ufs/quota.h"
#auto_if_type "sockdomainname" "PF_[[:alnum:]]+[[:space:]]+" "sys/socket.h"
auto_if_type "sockfamilyname" "AF_[[:alnum:]]+[[:space:]]+" "sys/socket.h"
auto_if_type "sockipprotoname" "IPPROTO_[[:alnum:]]+[[:space:]]+" "netinet/in.h"
auto_switch_type "sockoptname" "SO_[A-Z]+[[:space:]]+0x[0-9]+" "sys/socket.h"
#auto_switch_type "ptraceopname" "PT_[[:alnum:]_]+[[:space:]]+[0-9]+" "sys/ptrace.h"
# exclude KTRFAC_MASK
auto_orz_type "ktracefacname" "KTRFAC_[^M][[:alnum:]_]+" "sys/ktrace.h"
auto_switch_type "itimername" "ITIMER_[[:alnum:]_]+" "sys/time.h"
auto_switch_type "evfiltername" "EVFILT_[[:alnum:]_]+[[:space:]]+[(]" "sys/event.h"
auto_orz_type "pollfdeventname" "POLL[^_][[:alnum:]_]+[[:space:]]+0x" "sys/poll.h"
# exclude EV_{SYSFLAGS,FLAG1}
auto_orz_type "evflagsname" "EV_[^S][A-Z]+[[:space:]]+0x" "sys/event.h"
auto_orz_type "syslogflagname" "LOG_[A-Z]+[[:space:]]+0x0*[1248]0*[[:space:]]" "sys/syslog.h"
auto_orz_type "futexflagname" "FUTEX_[A-Z_]+[[:space:]]+[0-9]+" "sys/futex.h"
auto_switch_type "flocktypename" "F_[A-Z]+LCK" "sys/fcntl.h"

cat <<_EOF_
/*
 * AUTO - Special
 * F_ is used to specify fcntl commands as well as arguments. Both sets are
 * grouped in fcntl.h, and this awk script grabs the first group.
 */
void
fcntlcmdname (int arg)
{
	int noarg = 0;

	switch (arg1) {
_EOF_
egrep "^#[[:space:]]*define[[:space:]]+F_[A-Z_]+[[:space:]]+[0-9]+[[:space:]]*" \
	$include_dir/sys/fcntl.h | \
	awk 'BEGIN { o=0; \
		noarg["F_GETFD"] = 1; \
		noarg["F_GETFL"] = 1; \
		noarg["F_ISATTY"] = 1; \
		noarg["F_GETOWN"] = 1; \
	     }{ for (i = 1; i <= NF; i++) \
		if ($i ~ /define/) \
			break; \
		++i; \
		if (o > $(i+1)) \
			exit; \
		printf "\tcase %s:\n\t\t(void)printf(\"%s\");%s\n\t\tbreak;\n", $i, $i, \
			noarg[$i] ? "\n\t\tnoarg = 1;" : ""; \
		o = $(i+1) }'
cat <<_EOF_
	default: /* Should not reach */
		(void)printf("<invalid=%d>", arg1);
	}
	if (arg1 == F_SETFD) {
		(void)putchar(',');
		if (arg == FD_CLOEXEC)
			(void)printf("FD_CLOEXEC");
		else if (arg == 0)
			(void)printf("0");
		else
			(void)printf("<invalid>%#x", arg);

	} else if (arg1 == F_SETFL) {
		(void)putchar(',');
		doflagsname(arg, 0);
	} else if (!fancy || !noarg)
		(void)printf(",%#x", arg);
}

/*
 * AUTO - Special
 *
 * The send and recv functions have a flags argument which can be
 * set to 0. There is no corresponding #define. The auto_ functions
 * detect this as "invalid", which is incorrect here.
 */
void
sendrecvflagsname (int flags)
{
	int	or = 0;

	if (flags == 0) {
		(void)printf("0");
		return;
	}

	printf("%#x<", flags);
_EOF_
egrep "^#[[:space:]]*define[[:space:]]+MSG_[_A-Z]+[[:space:]]+0x[0-9]+[[:space:]]*" $include_dir/sys/socket.h | \
	awk '{ for (i = 1; i <= NF; i++) \
		if ($i ~ /define/) \
			break; \
		++i; \
		printf "\tif(!((flags>0)^((%s)>0)))\n\t\tif_print_or(flags, %s, or);\n", $i, $i }'
cat <<_EOF_
	printf(">");
}

/*
 * AUTO - Special
 *
 * SOCK_NONBLOCK and SOCK_CLOEXEC are or'ed into the type
 */
static void
dosocktypename (int arg, int show_type)
{
	int	type = arg & 0xff;		/* XXX */
	int	or = 0;
	
	printf("%#x<", arg);
	if (show_type || type) {
		or = 1;
		switch (type) {
_EOF_
	egrep "^#[[:space:]]*define[[:space:]]+SOCK_[A-Z]+[[:space:]]+[1-9]+[0-9]*[[:space:]]*" \
		$include_dir/sys/socket.h | \
	awk '{ for (i = 1; i <= NF; i++) \
		if ($i ~ /define/) \
			break; \
		++i; \
		printf "\t\tcase %s:\n\t\t\t(void)printf(\"%s\");\n\t\t\tbreak;\n", $i, $i }'
cat <<_EOF_
		default: /* Should not reach */
			(void)printf("<invalid=%d>", arg);
		}
	}

_EOF_
	egrep "^#[[:space:]]*define[[:space:]]+SOCK_[A-Z]+[[:space:]]+0x[0-9]+[[:space:]]*" \
		$include_dir/sys/socket.h | \
	awk '{ for (i = 1; i <= NF; i++) \
		if ($i ~ /define/) \
			break; \
		++i; \
		printf "\tif_print_or(arg, %s, or);\n", $i }'
cat <<_EOF_
	printf(">");
}

void
socktypename (int arg)
{
	dosocktypename(arg, 1);
}

void
sockflagsname (int arg)
{
	dosocktypename(arg, 0);
}

void
quotactlcmdname(int cmd)
{
	printf("%#x<QCMD(", cmd);
	quotactlname(cmd >> SUBCMDSHIFT);
	switch (cmd & SUBCMDMASK) {
	case USRQUOTA:
		printf(",%s)>", "USRQUOTA");
		break;
	case GRPQUOTA:
		printf(",%s)>", "GRPQUOTA");
		break;
	default:
		printf(",<invalid>%#x)>", cmd & SUBCMDMASK);
		break;
	}
}

/*
 * AUTO - Special
 *
 * kevent() NOTE_* interpretation depends on the filter type
 */
void
evfflagsname (int filter, int fflags)
{
	int	or = 0;

	if (fflags == 0) {
		printf("0<>");
		return;
	}
	printf("%#x<", fflags);
	switch (filter) {
	case EVFILT_READ:
	case EVFILT_WRITE:
		if_print_or(fflags, NOTE_LOWAT, or);
		if_print_or(fflags, NOTE_EOF, or);
		break;
	case EVFILT_VNODE:
_EOF_
	egrep "^#[[:space:]]*define[[:space:]]+NOTE_.[^O][A-Z]+[[:space:]]+0x[01248]{4}[^[:alnum:]]" \
		$include_dir/sys/event.h | \
	awk '{ for (i = 1; i <= NF; i++) \
		if ($i ~ /define/) \
			break; \
		++i; \
		printf "\t\tif_print_or(fflags, %s, or);\n", $i }'
cat <<_EOF_
		break;
	case EVFILT_PROC:
_EOF_
	egrep "^#[[:space:]]*define[[:space:]]+NOTE_[^S][A-Z]+[[:space:]]+0x[01248]{8}" \
		$include_dir/sys/event.h | \
	awk '{ for (i = 1; i <= NF; i++) \
		if ($i ~ /define/) \
			break; \
		++i; \
		printf "\t\tif_print_or(fflags, %s, or);\n", $i }'
cat <<_EOF_
		break;
	case EVFILT_TIMER:
#define NOTE_TIMER_UNITMASK \
    (NOTE_SECONDS|NOTE_MSECONDS|NOTE_USECONDS|NOTE_NSECONDS)
		switch (fflags & NOTE_TIMER_UNITMASK) {
		case NOTE_SECONDS:
			printf("NOTE_SECONDS");
			break;
		case NOTE_MSECONDS:
			printf("NOTE_MSECONDS");
			break;
		case NOTE_USECONDS:
			printf("NOTE_USECONDS");
			break;
		case NOTE_NSECONDS:
			printf("NOTE_NSECONDS");
			break;
		default:
			printf("invalid");
			break;
		}
		or = 1;
		if_print_or(fflags, NOTE_ABSTIME, or);
		break;
	}
	printf(">");
}

_EOF_