/*
 * CDDL HEADER START
 *
 * The contents of this file are subject to the terms of the
 * Common Development and Distribution License, Version 1.0 only
 * (the "License").  You may not use this file except in compliance
 * with the License.
 *
 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
 * or http://www.opensolaris.org/os/licensing.
 * See the License for the specific language governing permissions
 * and limitations under the License.
 *
 * When distributing Covered Code, include this CDDL HEADER in each
 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
 * If applicable, add the following below this CDDL HEADER, with the
 * fields enclosed by brackets "[]" replaced with your own identifying
 * information: Portions Copyright [yyyy] [name of copyright owner]
 *
 * CDDL HEADER END
 */
/*
 * Copyright 2004 Sun Microsystems, Inc.  All rights reserved.
 * Use is subject to license terms.
 */

/*	Copyright (c) 1984, 1986, 1987, 1988, 1989 AT&T	*/
/*	  All Rights Reserved  	*/

#include <sys/types.h>
#include <sys/procset.h>
#include <sys/priocntl.h>
#include <sys/fsspriocntl.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <libgen.h>
#include <limits.h>
#include <errno.h>
#include "priocntl.h"

/*
 * This file contains the class specific code implementing the fair-share
 * scheduler priocntl sub-command.
 */
#define	ADDKEYVAL(p, k, v)	{ (p[0]) = (k); (p[1]) = (v); p += 2; }
#define	FSS_KEYCNT		2	/* max number of (key, value) pairs */

/*
 * Control flags
 */
#define	FSS_DOUPRILIM	0x01	/* user priority limit */
#define	FSS_DOUPRI	0x02	/* user priority */

static void print_fssinfo(void);
static int print_fssprocs(void);
static int fss_priocntl(idtype_t, id_t, int, char *, uintptr_t *);
static int set_fssprocs(idtype_t, int, char **, uint_t, pri_t, pri_t);
static void exec_fsscmd(char **, uint_t, pri_t, pri_t);

static char usage[] =
"usage:	priocntl -l\n"
"	priocntl -d [-d idtype] [idlist]\n"
"	priocntl -s [-c FSS] [-m fssuprilim] [-p fssupri] [-i idtype] "
"[idlist]\n"
"	priocntl -e [-c FSS] [-m fssuprilim] [-p fssupri] command [argument(s)]"
"\n";

static char	cmdpath[MAXPATHLEN];
static char	basenm[BASENMSZ];


int
main(int argc, char *argv[])
{
	int c;
	int lflag, dflag, sflag, mflag, pflag, eflag, iflag;
	pri_t fssuprilim;
	pri_t fssupri;
	char *idtypnm;
	idtype_t idtype;
	int idargc;
	uint_t cflags;

	(void) strlcpy(cmdpath, argv[0], MAXPATHLEN);
	(void) strlcpy(basenm, basename(argv[0]), BASENMSZ);
	lflag = dflag = sflag = mflag = pflag = eflag = iflag = 0;
	while ((c = getopt(argc, argv, "ldsm:p:ec:i:")) != -1) {
		switch (c) {
		case 'l':
			lflag++;
			break;
		case 'd':
			dflag++;
			break;
		case 's':
			sflag++;
			break;
		case 'm':
			mflag++;
			fssuprilim = (pri_t)str2num(optarg, SHRT_MIN, SHRT_MAX);
			if (errno)
				fatalerr("%s: Specified user priority limit %s "
				    "out of configured range\n",
				    basenm, optarg);
			break;
		case 'p':
			pflag++;
			fssupri = (pri_t)str2num(optarg, SHRT_MIN, SHRT_MAX);
			if (errno)
				fatalerr("%s: Specified user priority %s "
				    "out of configured range\n",
				    basenm, optarg);
			break;
		case 'e':
			eflag++;
			break;
		case 'c':
			if (strcmp(optarg, "FSS") != 0)
				fatalerr("error: %s executed for %s class, %s "
				    "is actually sub-command for FSS class\n",
				    cmdpath, optarg, cmdpath);
			break;
		case 'i':
			iflag++;
			idtypnm = optarg;
			break;
		case '?':
			fatalerr(usage);
		default:
			break;
		}
	}

	if (lflag) {
		if (dflag || sflag || mflag || pflag || eflag || iflag)
			fatalerr(usage);

		print_fssinfo();

	} else if (dflag) {
		if (lflag || sflag || mflag || pflag || eflag)
			fatalerr(usage);

		return (print_fssprocs());

	} else if (sflag) {
		if (lflag || dflag || eflag)
			fatalerr(usage);

		if (iflag) {
			if (str2idtyp(idtypnm, &idtype) == -1)
				fatalerr("%s: Bad idtype %s\n", basenm,
				    idtypnm);
		} else {
			idtype = P_PID;
		}

		cflags = (pflag ? FSS_DOUPRI : 0);

		if (mflag)
			cflags |= FSS_DOUPRILIM;

		if (optind < argc)
			idargc = argc - optind;
		else
			idargc = 0;

		return (set_fssprocs(idtype, idargc, &argv[optind], cflags,
		    fssuprilim, fssupri));

	} else if (eflag) {
		if (lflag || dflag || sflag || iflag)
			fatalerr(usage);

		cflags = (pflag ? FSS_DOUPRI : 0);

		if (mflag)
			cflags |= FSS_DOUPRILIM;

		exec_fsscmd(&argv[optind], cflags, fssuprilim, fssupri);

	} else {
		fatalerr(usage);
	}

	return (0);
}

/*
 * Print our class name and the configured user priority range.
 */
static void
print_fssinfo(void)
{
	pcinfo_t pcinfo;

	(void) strcpy(pcinfo.pc_clname, "FSS");

	(void) printf("FSS (Fair Share)\n");

	if (priocntl(0, 0, PC_GETCID, (caddr_t)&pcinfo) == -1)
		fatalerr("\tCan't get configured FSS user priority range\n");

	(void) printf("\tConfigured FSS User Priority Range: -%d through %d\n",
	    ((fssinfo_t *)pcinfo.pc_clinfo)->fss_maxupri,
	    ((fssinfo_t *)pcinfo.pc_clinfo)->fss_maxupri);
}

/*
 * Read a list of pids from stdin and print the user priority and user
 * priority limit for each of the corresponding processes.
 */
static int
print_fssprocs(void)
{
	pid_t *pidlist;
	size_t numread;
	int i;
	char clname[PC_CLNMSZ];
	pri_t fssuprilim;
	pri_t fssupri;
	int error = 0;

	/*
	 * Read a list of pids from stdin.
	 */
	if ((pidlist = read_pidlist(&numread, stdin)) == NULL)
		fatalerr("%s: Can't read pidlist.\n", basenm);

	(void) printf("FAIR SHARING PROCESSES:\n"
	    "    PID    FSSUPRILIM   FSSUPRI\n");

	if (numread == 0)
		fatalerr("%s: No pids on input\n", basenm);

	for (i = 0; i < numread; i++) {
		(void) printf("%7ld", pidlist[i]);
		if (priocntl(P_PID, pidlist[i], PC_GETXPARMS, "FSS",
		    FSS_KY_UPRI, &fssupri,
		    FSS_KY_UPRILIM, &fssuprilim, 0) != -1) {
			(void) printf("    %5d       %5d\n",
			    fssuprilim, fssupri);
		} else {
			error = 1;

			if (priocntl(P_PID, pidlist[i], PC_GETXPARMS, NULL,
			    PC_KY_CLNAME, clname, 0) == -1 &&
			    strcmp(clname, "FSS"))
				/*
				 * Process from some class other than fair
				 * sharing. It has probably changed class while
				 * priocntl command was executing (otherwise
				 * we wouldn't have been passed its pid).
				 * Print the little we know about it.
				 */
				(void) printf("\tChanged to class %s while"
				    " priocntl command executing\n", clname);
			else
				(void) printf("\tCan't get FSS user priority"
				    "\n");
		}
	}

	free_pidlist(pidlist);
	return (error);
}

/*
 * Call priocntl() with command codes PC_SETXPARMS or PC_GETXPARMS.  The
 * first parameter behind the command code is always the class name.
 * Each parameter is headed by a key, which detemines the meanin of the
 * following value.  There is maximum FSS_KEYCNT == 2 of (key, value) pairs.
 */
static int
fss_priocntl(idtype_t idtype, id_t id, int cmd, char *clname, uintptr_t *argsp)
{
	return (priocntl(idtype, id, cmd, clname, argsp[0], argsp[1],
	    argsp[2], argsp[3], 0));
}

/*
 * Set all processes in the set specified by idtype/idargv to fair-sharing
 * (if they aren't already fair-sharing) and set their user priority limit
 * and user priority to those specified by fssuprilim and fssupri.
 */
static int
set_fssprocs(idtype_t idtype, int idargc, char **idargv, uint_t cflags,
    short fssuprilim, short fssupri)
{
	pcinfo_t pcinfo;
	uintptr_t args[2 * FSS_KEYCNT + 1];
	uintptr_t *argsp = &args[0];
	pri_t maxupri;
	char idtypnm[PC_IDTYPNMSZ];
	int i;
	int error = 0;
	id_t id;

	/*
	 * Get the fair sharing class ID and max configured user priority.
	 */
	(void) strcpy(pcinfo.pc_clname, "FSS");
	if (priocntl(0, 0, PC_GETCID, (caddr_t)&pcinfo) == -1)
		fatalerr("%s: Can't get FSS class ID, priocntl system call "
		    "failed (%s)\n", basenm, strerror(errno));
	maxupri = ((fssinfo_t *)pcinfo.pc_clinfo)->fss_maxupri;

	/*
	 * Validate the fssuprilim and fssupri arguments.
	 */
	if ((cflags & FSS_DOUPRILIM) != 0) {
		if (fssuprilim > maxupri || fssuprilim < -maxupri)
			fatalerr("%s: Specified user priority limit %d out of "
			    "configured range\n", basenm, fssuprilim);
		ADDKEYVAL(argsp, FSS_KY_UPRILIM, fssuprilim);
	}

	if ((cflags & FSS_DOUPRI) != 0) {
		if (fssupri > maxupri || fssupri < -maxupri)
			fatalerr("%s: Specified user priority %d out of "
			    "configured range\n", basenm, fssupri);
		ADDKEYVAL(argsp, FSS_KY_UPRI, fssupri);
	}
	*argsp = 0;

	if (idtype == P_ALL) {
		if (fss_priocntl(P_ALL, 0, PC_SETXPARMS, "FSS", args) == -1) {
			if (errno == EPERM) {
				(void) fprintf(stderr, "Permissions error "
				    "encountered on one or more processes.\n");
				error = 1;
			} else {
				fatalerr("%s: Can't reset fair sharing "
				    "parameters\npriocntl system call failed "
				    "(%s)\n", basenm, strerror(errno));
			}
		} else if ((cflags & (FSS_DOUPRILIM|FSS_DOUPRI)) ==
		    FSS_DOUPRI) {
			(void) verifyupri(idtype, 0, "FSS", FSS_KY_UPRILIM,
			    fssupri, basenm);
		}
	} else if (idargc == 0) {
		if (fss_priocntl(idtype, P_MYID, PC_SETXPARMS, "FSS",
		    args) == -1) {
			if (errno == EPERM) {
				(void) idtyp2str(idtype, idtypnm);
				(void) fprintf(stderr, "Permissions error "
				    "encountered on current %s.\n", idtypnm);
				error = 1;
			} else {
				fatalerr("%s: Can't reset fair sharing "
				    "parameters\npriocntl system call failed "
				    "(%s)\n", basenm, strerror(errno));
			}
		} else if ((cflags & (FSS_DOUPRILIM|FSS_DOUPRI)) ==
		    FSS_DOUPRI && getmyid(idtype, &id) != -1) {
			(void) verifyupri(idtype, id, "FSS", FSS_KY_UPRILIM,
			    fssupri, basenm);
		}
	} else {
		(void) idtyp2str(idtype, idtypnm);
		for (i = 0; i < idargc; i++) {
			if (idtype == P_CID) {
				(void) strcpy(pcinfo.pc_clname, idargv[i]);
				if (priocntl(0, 0, PC_GETCID,
				    (caddr_t)&pcinfo) == -1)
					fatalerr("%s: Invalid or unconfigured "
					    "class %s, priocntl system call "
					    "failed (%s)\n",
					    basenm, pcinfo.pc_clname,
					    strerror(errno));
				id = pcinfo.pc_cid;
			} else {
				id = (id_t)str2num(idargv[i], INT_MIN, INT_MAX);
				if (errno)
					fatalerr("%s: Invalid id \"%s\"\n",
					    basenm, idargv[i]);
			}

			if (fss_priocntl(idtype, id, PC_SETXPARMS, "FSS",
			    args) == -1) {
				if (errno == EPERM) {
					(void) fprintf(stderr, "Permissions "
					    "error encountered on %s %s.\n",
					    idtypnm, idargv[i]);
					error = 1;
				} else {
					fatalerr("%s: Can't reset fair sharing"
					    " parameters\npriocntl system call"
					    " failed (%s)\n",
					    basenm, strerror(errno));
				}
			} else if ((cflags & (FSS_DOUPRILIM|FSS_DOUPRI)) ==
			    FSS_DOUPRI) {
				(void) verifyupri(idtype, id, "FSS",
				    FSS_KY_UPRILIM, fssupri, basenm);
			}
		}
	}

	return (error);
}

/*
 * Execute the command pointed to by cmdargv as a fair-sharing process
 * with the user priority limit given by fssuprilim and user priority fssupri.
 */
static void
exec_fsscmd(char **cmdargv, uint_t cflags, pri_t fssuprilim, pri_t fssupri)
{
	pcinfo_t pcinfo;
	uintptr_t args[2 * FSS_KEYCNT + 1];
	uintptr_t *argsp = &args[0];
	pri_t maxupri;
	pri_t uprilim;

	/*
	 * Get the fair sharing class ID and max configured user priority.
	 */
	(void) strcpy(pcinfo.pc_clname, "FSS");
	if (priocntl(0, 0, PC_GETCID, (caddr_t)&pcinfo) == -1)
		fatalerr("%s: Can't get FSS class ID, priocntl system call "
		    "failed (%s)\n", basenm, strerror(errno));
	maxupri = ((fssinfo_t *)pcinfo.pc_clinfo)->fss_maxupri;

	if ((cflags & FSS_DOUPRILIM) != 0) {
		if (fssuprilim > maxupri || fssuprilim < -maxupri)
			fatalerr("%s: Specified user priority limit %d out of "
			    "configured range\n", basenm, fssuprilim);
		ADDKEYVAL(argsp, FSS_KY_UPRILIM, fssuprilim);
	}

	if ((cflags & FSS_DOUPRI) != 0) {
		if (fssupri > maxupri || fssupri < -maxupri)
			fatalerr("%s: Specified user priority %d out of "
			    "configured range\n", basenm, fssupri);
		ADDKEYVAL(argsp, FSS_KY_UPRI, fssupri);
	}
	*argsp = 0;

	if (fss_priocntl(P_PID, P_MYID, PC_SETXPARMS, "FSS", args) == -1)
		fatalerr("%s: Can't reset fair sharing parameters\n"
		    "priocntl system call failed (%s)\n",
		    basenm, strerror(errno));

	if ((cflags & (FSS_DOUPRILIM|FSS_DOUPRI)) == FSS_DOUPRI) {
		if (priocntl(P_PID, P_MYID, PC_GETXPARMS, "FSS",
		    FSS_KY_UPRILIM, &uprilim, 0) != -1 && fssupri > uprilim)
			(void) fprintf(stderr,
			    "%s: Specified user priority %d exceeds"
			    " limit %d; set to %d (pid %d)\n",
			    basenm, fssupri, uprilim, uprilim, (int)getpid());
	}

	(void) execvp(cmdargv[0], cmdargv);
	fatalerr("%s: Can't execute %s, exec failed (%s)\n",
	    basenm, cmdargv[0], strerror(errno));
}