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Annotation of 43BSDReno/usr.bin/renice/renice.c, revision 1.1.1.1

1.1       root        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 are permitted
                      6:  * provided that: (1) source distributions retain this entire copyright
                      7:  * notice and comment, and (2) distributions including binaries display
                      8:  * the following acknowledgement:  ``This product includes software
                      9:  * developed by the University of California, Berkeley and its contributors''
                     10:  * in the documentation or other materials provided with the distribution
                     11:  * and in all advertising materials mentioning features or use of this
                     12:  * software. Neither the name of the University nor the names of its
                     13:  * contributors may be used to endorse or promote products derived
                     14:  * from this software without specific prior written permission.
                     15:  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR
                     16:  * IMPLIED WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED
                     17:  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
                     18:  */
                     19: 
                     20: #ifndef lint
                     21: char copyright[] =
                     22: "@(#) Copyright (c) 1989 The Regents of the University of California.\n\
                     23:  All rights reserved.\n";
                     24: #endif /* not lint */
                     25: 
                     26: #ifndef lint
                     27: static char sccsid[] = "@(#)renice.c   5.3 (Berkeley) 6/1/90";
                     28: #endif /* not lint */
                     29: 
                     30: #include <sys/time.h>
                     31: #include <sys/resource.h>
                     32: #include <stdio.h>
                     33: #include <pwd.h>
                     34: 
                     35: /*
                     36:  * Change the priority (nice) of processes
                     37:  * or groups of processes which are already
                     38:  * running.
                     39:  */
                     40: main(argc, argv)
                     41:        char **argv;
                     42: {
                     43:        int which = PRIO_PROCESS;
                     44:        int who = 0, prio, errs = 0;
                     45: 
                     46:        argc--, argv++;
                     47:        if (argc < 2) {
                     48:                fprintf(stderr, "usage: renice priority [ [ -p ] pids ] ");
                     49:                fprintf(stderr, "[ [ -g ] pgrps ] [ [ -u ] users ]\n");
                     50:                exit(1);
                     51:        }
                     52:        prio = atoi(*argv);
                     53:        argc--, argv++;
                     54:        if (prio > PRIO_MAX)
                     55:                prio = PRIO_MAX;
                     56:        if (prio < PRIO_MIN)
                     57:                prio = PRIO_MIN;
                     58:        for (; argc > 0; argc--, argv++) {
                     59:                if (strcmp(*argv, "-g") == 0) {
                     60:                        which = PRIO_PGRP;
                     61:                        continue;
                     62:                }
                     63:                if (strcmp(*argv, "-u") == 0) {
                     64:                        which = PRIO_USER;
                     65:                        continue;
                     66:                }
                     67:                if (strcmp(*argv, "-p") == 0) {
                     68:                        which = PRIO_PROCESS;
                     69:                        continue;
                     70:                }
                     71:                if (which == PRIO_USER) {
                     72:                        register struct passwd *pwd = getpwnam(*argv);
                     73:                        
                     74:                        if (pwd == NULL) {
                     75:                                fprintf(stderr, "renice: %s: unknown user\n",
                     76:                                        *argv);
                     77:                                continue;
                     78:                        }
                     79:                        who = pwd->pw_uid;
                     80:                } else {
                     81:                        who = atoi(*argv);
                     82:                        if (who < 0) {
                     83:                                fprintf(stderr, "renice: %s: bad value\n",
                     84:                                        *argv);
                     85:                                continue;
                     86:                        }
                     87:                }
                     88:                errs += donice(which, who, prio);
                     89:        }
                     90:        exit(errs != 0);
                     91: }
                     92: 
                     93: donice(which, who, prio)
                     94:        int which, who, prio;
                     95: {
                     96:        int oldprio;
                     97:        extern int errno;
                     98: 
                     99:        errno = 0, oldprio = getpriority(which, who);
                    100:        if (oldprio == -1 && errno) {
                    101:                fprintf(stderr, "renice: %d: ", who);
                    102:                perror("getpriority");
                    103:                return (1);
                    104:        }
                    105:        if (setpriority(which, who, prio) < 0) {
                    106:                fprintf(stderr, "renice: %d: ", who);
                    107:                perror("setpriority");
                    108:                return (1);
                    109:        }
                    110:        printf("%d: old priority %d, new priority %d\n", who, oldprio, prio);
                    111:        return (0);
                    112: }

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