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Annotation of src/usr.bin/renice/renice.c, Revision 1.1

1.1     ! deraadt     1: /*
        !             2:  * Copyright (c) 1983 The Regents of the University of California.
        !             3:  * All rights reserved.
        !             4:  *
        !             5:  * Redistribution and use in source and binary forms, with or without
        !             6:  * modification, are permitted provided that the following conditions
        !             7:  * are met:
        !             8:  * 1. Redistributions of source code must retain the above copyright
        !             9:  *    notice, this list of conditions and the following disclaimer.
        !            10:  * 2. Redistributions in binary form must reproduce the above copyright
        !            11:  *    notice, this list of conditions and the following disclaimer in the
        !            12:  *    documentation and/or other materials provided with the distribution.
        !            13:  * 3. All advertising materials mentioning features or use of this software
        !            14:  *    must display the following acknowledgement:
        !            15:  *     This product includes software developed by the University of
        !            16:  *     California, Berkeley and its contributors.
        !            17:  * 4. Neither the name of the University nor the names of its contributors
        !            18:  *    may be used to endorse or promote products derived from this software
        !            19:  *    without specific prior written permission.
        !            20:  *
        !            21:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            22:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            23:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            24:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            25:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            26:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            27:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            28:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            29:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            30:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            31:  * SUCH DAMAGE.
        !            32:  */
        !            33:
        !            34: #ifndef lint
        !            35: char copyright[] =
        !            36: "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
        !            37:  All rights reserved.\n";
        !            38: #endif /* not lint */
        !            39:
        !            40: #ifndef lint
        !            41: /*static char sccsid[] = "from: @(#)renice.c   5.3 (Berkeley) 6/1/90";*/
        !            42: static char rcsid[] = "$Id: renice.c,v 1.3 1993/12/02 19:52:15 pk Exp $";
        !            43: #endif /* not lint */
        !            44:
        !            45: #include <sys/types.h>
        !            46: #include <sys/time.h>
        !            47: #include <sys/resource.h>
        !            48: #include <stdio.h>
        !            49: #include <pwd.h>
        !            50:
        !            51: /*
        !            52:  * Change the priority (nice) of processes
        !            53:  * or groups of processes which are already
        !            54:  * running.
        !            55:  */
        !            56: main(argc, argv)
        !            57:        char **argv;
        !            58: {
        !            59:        int which = PRIO_PROCESS;
        !            60:        int who = 0, prio, errs = 0;
        !            61:
        !            62:        argc--, argv++;
        !            63:        if (argc < 2) {
        !            64:                fprintf(stderr, "usage: renice priority [ [ -p ] pids ] ");
        !            65:                fprintf(stderr, "[ [ -g ] pgrps ] [ [ -u ] users ]\n");
        !            66:                exit(1);
        !            67:        }
        !            68:        prio = atoi(*argv);
        !            69:        argc--, argv++;
        !            70:        if (prio > PRIO_MAX)
        !            71:                prio = PRIO_MAX;
        !            72:        if (prio < PRIO_MIN)
        !            73:                prio = PRIO_MIN;
        !            74:        for (; argc > 0; argc--, argv++) {
        !            75:                if (strcmp(*argv, "-g") == 0) {
        !            76:                        which = PRIO_PGRP;
        !            77:                        continue;
        !            78:                }
        !            79:                if (strcmp(*argv, "-u") == 0) {
        !            80:                        which = PRIO_USER;
        !            81:                        continue;
        !            82:                }
        !            83:                if (strcmp(*argv, "-p") == 0) {
        !            84:                        which = PRIO_PROCESS;
        !            85:                        continue;
        !            86:                }
        !            87:                if (which == PRIO_USER) {
        !            88:                        register struct passwd *pwd = getpwnam(*argv);
        !            89:
        !            90:                        if (pwd == NULL) {
        !            91:                                fprintf(stderr, "renice: %s: unknown user\n",
        !            92:                                        *argv);
        !            93:                                continue;
        !            94:                        }
        !            95:                        who = pwd->pw_uid;
        !            96:                } else {
        !            97:                        who = atoi(*argv);
        !            98:                        if (who < 0) {
        !            99:                                fprintf(stderr, "renice: %s: bad value\n",
        !           100:                                        *argv);
        !           101:                                continue;
        !           102:                        }
        !           103:                }
        !           104:                errs += donice(which, who, prio);
        !           105:        }
        !           106:        exit(errs != 0);
        !           107: }
        !           108:
        !           109: donice(which, who, prio)
        !           110:        int which, who, prio;
        !           111: {
        !           112:        int oldprio;
        !           113:        extern int errno;
        !           114:
        !           115:        errno = 0, oldprio = getpriority(which, who);
        !           116:        if (oldprio == -1 && errno) {
        !           117:                fprintf(stderr, "renice: %d: ", who);
        !           118:                perror("getpriority");
        !           119:                return (1);
        !           120:        }
        !           121:        if (setpriority(which, who, prio) < 0) {
        !           122:                fprintf(stderr, "renice: %d: ", who);
        !           123:                perror("setpriority");
        !           124:                return (1);
        !           125:        }
        !           126:        printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
        !           127:        return (0);
        !           128: }