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Annotation of prex-old/usr/bin/nice/nice.c, Revision 1.1

1.1     ! nbrk        1: /*
        !             2:  * Copyright (c) 1989 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. Neither the name of the University nor the names of its contributors
        !            14:  *    may be used to endorse or promote products derived from this software
        !            15:  *    without specific prior written permission.
        !            16:  *
        !            17:  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
        !            18:  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
        !            19:  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
        !            20:  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
        !            21:  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
        !            22:  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
        !            23:  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
        !            24:  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
        !            25:  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
        !            26:  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
        !            27:  * SUCH DAMAGE.
        !            28:  */
        !            29:
        !            30: #include <prex/prex.h>
        !            31:
        !            32: #include <sys/types.h>
        !            33: #include <sys/time.h>
        !            34: #include <sys/resource.h>
        !            35:
        !            36: #include <ctype.h>
        !            37: #include <errno.h>
        !            38: #include <stdio.h>
        !            39: #include <stdlib.h>
        !            40: #include <unistd.h>
        !            41: #include <string.h>
        !            42: #include <err.h>
        !            43:
        !            44: #ifdef CMDBOX
        !            45: #define main(argc, argv)       nice_main(argc, argv)
        !            46: #endif
        !            47:
        !            48: #define        DEFNICE 10
        !            49:
        !            50: static void usage(void);
        !            51:
        !            52: int
        !            53: main(int argc, char *argv[])
        !            54: {
        !            55:        int niceness = DEFNICE;
        !            56:        int c;
        !            57:
        !            58:         /* handle obsolete -number syntax */
        !            59:         if (argc > 1 && argv[1][0] == '-' &&
        !            60:            isdigit((unsigned char)argv[1][1])) {
        !            61:                niceness = atoi (argv[1] + 1);
        !            62:                 argc--; argv++;
        !            63:         }
        !            64:
        !            65:        while ((c = getopt (argc, argv, "n:")) != -1) {
        !            66:                switch (c) {
        !            67:                case 'n':
        !            68:                        niceness = atoi (optarg);
        !            69:                        break;
        !            70:
        !            71:                case '?':
        !            72:                default:
        !            73:                        usage();
        !            74:                        break;
        !            75:                }
        !            76:        }
        !            77:        argc -= optind; argv += optind;
        !            78:
        !            79:        if (argc == 0)
        !            80:                usage();
        !            81:
        !            82:        errno = 0;
        !            83:        niceness += getpriority(PRIO_PROCESS, 0);
        !            84:        if (errno) {
        !            85:                err (1, "getpriority");
        !            86:                /* NOTREACHED */
        !            87:        }
        !            88:        if (setpriority(PRIO_PROCESS, 0, niceness)) {
        !            89:                warn ("setpriority");
        !            90:        }
        !            91:
        !            92:        execvp(argv[0], &argv[0]);
        !            93:        err ((errno == ENOENT) ? 127 : 126, "%s", argv[0]);
        !            94:        /* NOTREACHED */
        !            95:        return 0;
        !            96: }
        !            97:
        !            98: static void
        !            99: usage()
        !           100: {
        !           101:        (void)fprintf(stderr,
        !           102:            "usage: nice [ -n increment ] utility [ argument ...]\n");
        !           103:        exit(1);
        !           104: }