Annotation of prex/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 <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: }
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