1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
|
/*
* Copyright (c) 1989, 1993, 1994
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#ifndef lint
static const char copyright[] =
"@(#) Copyright (c) 1989, 1993, 1994\n\
The Regents of the University of California. All rights reserved.\n";
#endif /* not lint */
#if 0
#ifndef lint
static char sccsid[] = "@(#)nice.c 8.2 (Berkeley) 4/16/94";
#endif /* not lint */
#endif
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/types.h>
#include <sys/time.h>
#include <sys/resource.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <limits.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#define DEFNICE 10
void usage(void);
int
main(int argc, char *argv[])
{
long niceness = DEFNICE;
int ch;
char *ep;
/* Obsolescent syntax: -number, --number */
if (argc >= 2 && argv[1][0] == '-' && (argv[1][1] == '-' ||
isdigit((unsigned char)argv[1][1])) && strcmp(argv[1], "--") != 0)
if (asprintf(&argv[1], "-n%s", argv[1] + 1) < 0)
err(1, "asprintf");
while ((ch = getopt(argc, argv, "n:")) != -1) {
switch (ch) {
case 'n':
errno = 0;
niceness = strtol(optarg, &ep, 10);
if (ep == optarg || *ep != '\0' || errno ||
niceness < INT_MIN || niceness > INT_MAX)
errx(1, "%s: invalid nice value", optarg);
break;
default:
usage();
}
}
argc -= optind;
argv += optind;
if (argc == 0)
usage();
errno = 0;
niceness += getpriority(PRIO_PROCESS, 0);
if (errno)
warn("getpriority");
else if (setpriority(PRIO_PROCESS, 0, (int)niceness))
warn("setpriority");
execvp(*argv, argv);
err(errno == ENOENT ? 127 : 126, "%s", *argv);
}
void
usage(void)
{
(void)fprintf(stderr,
"usage: nice [-n increment] utility [argument ...]\n");
exit(1);
}
|
