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Annotation of prex-old/usr/bin/nice/nice.c, Revision 1.1.1.1.2.1

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 <sys/types.h>
                     31: #include <sys/time.h>
                     32: #include <sys/resource.h>
                     33:
                     34: #include <ctype.h>
                     35: #include <errno.h>
                     36: #include <stdio.h>
                     37: #include <stdlib.h>
                     38: #include <unistd.h>
                     39: #include <string.h>
                     40: #include <err.h>
                     41:
                     42: #ifdef CMDBOX
                     43: #define main(argc, argv)       nice_main(argc, argv)
                     44: #endif
                     45:
                     46: #define        DEFNICE 10
                     47:
                     48: static void usage(void);
                     49:
                     50: int
                     51: main(int argc, char *argv[])
                     52: {
                     53:        int niceness = DEFNICE;
                     54:        int c;
                     55:
                     56:         /* handle obsolete -number syntax */
                     57:         if (argc > 1 && argv[1][0] == '-' &&
                     58:            isdigit((unsigned char)argv[1][1])) {
                     59:                niceness = atoi (argv[1] + 1);
                     60:                 argc--; argv++;
                     61:         }
                     62:
                     63:        while ((c = getopt (argc, argv, "n:")) != -1) {
                     64:                switch (c) {
                     65:                case 'n':
                     66:                        niceness = atoi (optarg);
                     67:                        break;
                     68:
                     69:                case '?':
                     70:                default:
                     71:                        usage();
                     72:                        break;
                     73:                }
                     74:        }
                     75:        argc -= optind; argv += optind;
                     76:
                     77:        if (argc == 0)
                     78:                usage();
                     79:
                     80:        errno = 0;
                     81:        niceness += getpriority(PRIO_PROCESS, 0);
                     82:        if (errno) {
                     83:                err (1, "getpriority");
                     84:                /* NOTREACHED */
                     85:        }
                     86:        if (setpriority(PRIO_PROCESS, 0, niceness)) {
                     87:                warn ("setpriority");
                     88:        }
                     89:
                     90:        execvp(argv[0], &argv[0]);
                     91:        err ((errno == ENOENT) ? 127 : 126, "%s", argv[0]);
                     92:        /* NOTREACHED */
                     93:        return 0;
                     94: }
                     95:
                     96: static void
                     97: usage()
                     98: {
                     99:        (void)fprintf(stderr,
                    100:            "usage: nice [ -n increment ] utility [ argument ...]\n");
                    101:        exit(1);
                    102: }