/*
 * 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        <stdio.h>
#include        <string.h>
#include        <stdlib.h>
#include        <unistd.h>
#include        <sys/types.h>
#include        <sys/procset.h>
#include        <sys/priocntl.h>
#include        <sys/iapriocntl.h>
#include        <libgen.h>
#include        <limits.h>
#include        <errno.h>

#include        "priocntl.h"

/*
 * This file contains the class specific code implementing
 * the interactive class priocntl sub-command.
 */

#define ADDKEYVAL(p, k, v) { (p[0]) = (k); (p[1]) = (v); p += 2; }

#define IA_KEYCNT       3       /* maximal number of (key, value) pairs */

/*
 * control flags
 */
#define IA_DOUPRILIM    0x01            /* user priority limit */
#define IA_DOUPRI       0x02            /* user priority */
#define IA_DOMODE       0x04            /* interactive on/off */

static void     print_iainfo(void);
static int      print_iaprocs(void);
static int      ia_priocntl(idtype_t, id_t, int, char *, uintptr_t *);
static int      set_iaprocs(idtype_t, int, char **, uint_t, pri_t, pri_t, int);
static void     exec_iacmd(char **, uint_t, pri_t, pri_t, int);

static char usage[] =
"usage: priocntl -l\n\
        priocntl -d [-i idtype] [idlist]\n\
        priocntl -s [-c IA] [-m iauprilim] [-p iaupri] [-t iamode]\n\
                    [-i idtype] [idlist]\n\
        priocntl -e [-c IA] [-m iauprilim] [-p iaupri] [-t iamode]\n\
                    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, tflag;
        int             iamode;
        pri_t           iauprilim;
        pri_t           iaupri;
        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 = tflag = 0;
        while ((c = getopt(argc, argv, "ldsm:p:t:ec:i:")) != -1) {
                switch (c) {

                case 'l':
                        lflag++;
                        break;

                case 'd':
                        dflag++;
                        break;

                case 's':
                        sflag++;
                        break;

                case 'm':
                        mflag++;
                        iauprilim = (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++;
                        iaupri = (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 't':
                        tflag++;
                        iamode = (int)str2num(optarg, INT_MIN, INT_MAX);
                        if (errno || (iamode != IA_INTERACTIVE_OFF &&
                            iamode != IA_SET_INTERACTIVE))
                                fatalerr("%s: Specified illegal mode %s\n",
                                    basenm, optarg);
                        break;

                case 'e':
                        eflag++;
                        break;

                case 'c':
                        if (strcmp(optarg, "IA") != 0)
                                fatalerr("error: %s executed for %s class, %s"
                                    " is actually sub-command for IA class\n",
                                    cmdpath, optarg, cmdpath);
                        break;

                case 'i':
                        iflag++;
                        idtypnm = optarg;
                        break;

                case '?':
                        fatalerr(usage);

                default:
                        break;
                }
        }

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

                print_iainfo();

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

                return (print_iaprocs());

        } 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 ? IA_DOUPRI : 0);

                if (mflag)
                        cflags |= IA_DOUPRILIM;

                if (tflag)
                        cflags |= IA_DOMODE;

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

                return (set_iaprocs(idtype, idargc, &argv[optind], cflags,
                    iauprilim, iaupri, iamode));

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

                cflags = (pflag ? IA_DOUPRI : 0);

                if (mflag)
                        cflags |= IA_DOUPRILIM;

                if (tflag)
                        cflags |= IA_DOMODE;

                exec_iacmd(&argv[optind], cflags, iauprilim, iaupri, iamode);

        } else {
                fatalerr(usage);
        }

        return (0);
}


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

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

        (void) printf("IA (Interactive)\n");

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

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


/*
 * Read a list of pids from stdin and print the user priority and user
 * priority limit for each of the corresponding processes.
 * print their interactive mode and nice values
 */
static int
print_iaprocs(void)
{
        pid_t           *pidlist;
        size_t          numread;
        int             i;
        char            clname[PC_CLNMSZ];
        pri_t           ia_uprilim;
        pri_t           ia_upri;
        int             ia_mode;
        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("INTERACTIVE CLASS PROCESSES:");
        (void) printf("\n    PID    IAUPRILIM    IAUPRI    IAMODE\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, "IA",
                    IA_KY_UPRI, &ia_upri, IA_KY_UPRILIM, &ia_uprilim,
                    IA_KY_MODE, &ia_mode, 0) != -1) {
                        (void) printf("    %5d       %5d     %5d\n",
                            ia_uprilim, ia_upri, ia_mode);
                } else {
                        error = 1;

                        if (priocntl(P_PID, pidlist[i], PC_GETXPARMS, NULL,
                            PC_KY_CLNAME, clname, 0) != -1 &&
                            strcmp(clname, "IA"))
                                /*
                                 * Process from some class other than
                                 * interactive. 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 IA 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 determines the meaning of the
 * following value. There are maximal IA_KEYCNT = 3 (key, value) pairs.
 */
static int
ia_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], argsp[4], argsp[5], 0));
}


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

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

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

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

        if ((cflags & IA_DOMODE) != 0)
                ADDKEYVAL(argsp, IA_KY_MODE, iamode);
        *argsp = 0;

        if (idtype == P_ALL) {
                if (ia_priocntl(P_ALL, 0, PC_SETXPARMS, "IA", 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 interactive"
                                    " parameters\npriocntl system call failed"
                                    " with errno %d\n", basenm, errno);
                        }
                } else if ((cflags & (IA_DOUPRILIM|IA_DOUPRI)) == IA_DOUPRI) {
                        (void) verifyupri(idtype, 0, "IA", IA_KY_UPRILIM,
                            iaupri, basenm);
                }
        } else if (idargc == 0) {
                if (ia_priocntl(idtype, P_MYID, PC_SETXPARMS, "IA",
                    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 interactive"
                                    " parameters\npriocntl system call failed"
                                    " with errno %d\n", basenm, errno);
                        }
                } else if ((cflags & (IA_DOUPRILIM|IA_DOUPRI)) == IA_DOUPRI &&
                    getmyid(idtype, &id) != -1) {
                        (void) verifyupri(idtype, id, "IA", IA_KY_UPRILIM,
                            iaupri, 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 with errno %d\n",
                                            basenm, pcinfo.pc_clname, 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 (ia_priocntl(idtype, id, PC_SETXPARMS, "IA",
                            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 interactive"
                                            " parameters\npriocntl system call"
                                            " failed with errno %d\n",
                                            basenm, errno);
                                }
                        } else if ((cflags & (IA_DOUPRILIM|IA_DOUPRI)) ==
                            IA_DOUPRI) {
                                (void) verifyupri(idtype, id, "IA",
                                    IA_KY_UPRILIM, iaupri, basenm);
                        }
                }
        }

        return (error);
}


/*
 * Execute the command pointed to by cmdargv as a interactive process
 * with the user priority limit given by iauprilim and user priority iaupri.
 */
static void
exec_iacmd(char **cmdargv, uint_t cflags, pri_t iauprilim, pri_t iaupri,
        int iamode)
{
        pcinfo_t        pcinfo;
        uintptr_t       args[2*IA_KEYCNT+1];
        uintptr_t       *argsp = &args[0];
        pri_t           maxupri;
        pri_t           uprilim;

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

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

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

        if ((cflags & IA_DOMODE) != 0)
                ADDKEYVAL(argsp, IA_KY_MODE, iamode);
        *argsp = 0;

        if (ia_priocntl(P_PID, P_MYID, PC_SETXPARMS, "IA", args) == -1)
                fatalerr("%s: Can't reset interactive parameters\n"
                    "priocntl system call failed with errno %d\n",
                    basenm, errno);

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

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