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Annotation of src/usr.bin/renice/renice.c, Revision 1.4

1.4     ! deraadt     1: /*     $OpenBSD: renice.c,v 1.3 1997/06/20 10:02:31 deraadt Exp $      */
1.2       deraadt     2:
1.1       deraadt     3: /*
                      4:  * Copyright (c) 1983 The Regents of the University of California.
                      5:  * All rights reserved.
                      6:  *
                      7:  * Redistribution and use in source and binary forms, with or without
                      8:  * modification, are permitted provided that the following conditions
                      9:  * are met:
                     10:  * 1. Redistributions of source code must retain the above copyright
                     11:  *    notice, this list of conditions and the following disclaimer.
                     12:  * 2. Redistributions in binary form must reproduce the above copyright
                     13:  *    notice, this list of conditions and the following disclaimer in the
                     14:  *    documentation and/or other materials provided with the distribution.
                     15:  * 3. All advertising materials mentioning features or use of this software
                     16:  *    must display the following acknowledgement:
                     17:  *     This product includes software developed by the University of
                     18:  *     California, Berkeley and its contributors.
                     19:  * 4. Neither the name of the University nor the names of its contributors
                     20:  *    may be used to endorse or promote products derived from this software
                     21:  *    without specific prior written permission.
                     22:  *
                     23:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
                     24:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
                     25:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
                     26:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
                     27:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
                     28:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
                     29:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
                     30:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
                     31:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
                     32:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
                     33:  * SUCH DAMAGE.
                     34:  */
                     35:
                     36: #ifndef lint
                     37: char copyright[] =
                     38: "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
                     39:  All rights reserved.\n";
                     40: #endif /* not lint */
                     41:
                     42: #ifndef lint
                     43: /*static char sccsid[] = "from: @(#)renice.c   5.3 (Berkeley) 6/1/90";*/
1.4     ! deraadt    44: static char rcsid[] = "$OpenBSD: renice.c,v 1.3 1997/06/20 10:02:31 deraadt Exp $";
1.1       deraadt    45: #endif /* not lint */
                     46:
                     47: #include <sys/types.h>
                     48: #include <sys/time.h>
                     49: #include <sys/resource.h>
                     50: #include <stdio.h>
1.3       deraadt    51: #include <stdlib.h>
1.1       deraadt    52: #include <pwd.h>
                     53:
1.3       deraadt    54: int donice __P((int, int, int));
                     55:
1.1       deraadt    56: /*
                     57:  * Change the priority (nice) of processes
                     58:  * or groups of processes which are already
                     59:  * running.
                     60:  */
1.3       deraadt    61: int
1.1       deraadt    62: main(argc, argv)
                     63:        char **argv;
                     64: {
                     65:        int which = PRIO_PROCESS;
                     66:        int who = 0, prio, errs = 0;
                     67:
                     68:        argc--, argv++;
                     69:        if (argc < 2) {
1.4     ! deraadt    70:                fprintf(stderr, "usage: renice priority [[-p] pid ...] ");
        !            71:                fprintf(stderr, "[[-g] pgrp ...] [[-u] user ...]\n");
1.1       deraadt    72:                exit(1);
                     73:        }
                     74:        prio = atoi(*argv);
                     75:        argc--, argv++;
                     76:        if (prio > PRIO_MAX)
                     77:                prio = PRIO_MAX;
                     78:        if (prio < PRIO_MIN)
                     79:                prio = PRIO_MIN;
                     80:        for (; argc > 0; argc--, argv++) {
                     81:                if (strcmp(*argv, "-g") == 0) {
                     82:                        which = PRIO_PGRP;
                     83:                        continue;
                     84:                }
                     85:                if (strcmp(*argv, "-u") == 0) {
                     86:                        which = PRIO_USER;
                     87:                        continue;
                     88:                }
                     89:                if (strcmp(*argv, "-p") == 0) {
                     90:                        which = PRIO_PROCESS;
                     91:                        continue;
                     92:                }
                     93:                if (which == PRIO_USER) {
                     94:                        register struct passwd *pwd = getpwnam(*argv);
                     95:
                     96:                        if (pwd == NULL) {
                     97:                                fprintf(stderr, "renice: %s: unknown user\n",
                     98:                                        *argv);
                     99:                                continue;
                    100:                        }
                    101:                        who = pwd->pw_uid;
                    102:                } else {
                    103:                        who = atoi(*argv);
                    104:                        if (who < 0) {
                    105:                                fprintf(stderr, "renice: %s: bad value\n",
                    106:                                        *argv);
                    107:                                continue;
                    108:                        }
                    109:                }
                    110:                errs += donice(which, who, prio);
                    111:        }
                    112:        exit(errs != 0);
                    113: }
                    114:
1.3       deraadt   115: int
1.1       deraadt   116: donice(which, who, prio)
                    117:        int which, who, prio;
                    118: {
                    119:        int oldprio;
                    120:        extern int errno;
                    121:
                    122:        errno = 0, oldprio = getpriority(which, who);
                    123:        if (oldprio == -1 && errno) {
                    124:                fprintf(stderr, "renice: %d: ", who);
                    125:                perror("getpriority");
                    126:                return (1);
                    127:        }
                    128:        if (setpriority(which, who, prio) < 0) {
                    129:                fprintf(stderr, "renice: %d: ", who);
                    130:                perror("setpriority");
                    131:                return (1);
                    132:        }
                    133:        printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
                    134:        return (0);
                    135: }