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Annotation of 43BSDReno/usr.bin/nice/nice.c, revision 1.1

1.1     ! root        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 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[] = "@(#)nice.c     5.4 (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 <ctype.h>
        !            34: 
        !            35: #define        DEFNICE 10
        !            36: 
        !            37: /* ARGSUSED */
        !            38: main(argc, argv)
        !            39:        int argc;
        !            40:        char **argv;
        !            41: {
        !            42:        extern int errno;
        !            43:        int niceness;
        !            44:        char *strerror();
        !            45: 
        !            46:        niceness = DEFNICE;
        !            47:        if (argv[1][0] == '-')
        !            48:                if (isdigit(argv[1][1])) {
        !            49:                        niceness = atoi(argv[1] + 1);
        !            50:                        ++argv;
        !            51:                }
        !            52:                else {
        !            53:                        (void)fprintf(stderr, "nice: illegal option -- %c\n",
        !            54:                            argv[1][1]);
        !            55:                        usage();
        !            56:                }
        !            57: 
        !            58:        if (!argv[1])
        !            59:                usage();
        !            60: 
        !            61:        errno = 0;
        !            62:        niceness += getpriority(PRIO_PROCESS, 0);
        !            63:        if (errno) {
        !            64:                (void)fprintf(stderr, "nice: getpriority: %s\n",
        !            65:                    strerror(errno));
        !            66:                exit(1);
        !            67:        }
        !            68:        if (setpriority(PRIO_PROCESS, 0, niceness)) {
        !            69:                (void)fprintf(stderr,
        !            70:                    "nice: setpriority: %s\n", strerror(errno));
        !            71:                exit(1);
        !            72:        }
        !            73:        execvp(argv[1], &argv[1]);
        !            74:        (void)fprintf(stderr,
        !            75:            "nice: %s: %s\n", argv[1], strerror(errno));
        !            76:        exit(1);
        !            77: }
        !            78: 
        !            79: usage()
        !            80: {
        !            81:        (void)fprintf(stderr,
        !            82:            "nice [ -# ] command [ options ] [ operands ]\n");
        !            83:        exit(1);
        !            84: }

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