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
|
/* vi: set sw=4 ts=4: */
/*
* taskset - retrieve or set a processes' CPU affinity
* Copyright (c) 2006 Bernhard Fischer
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "busybox.h"
#include <sched.h>
#include <unistd.h>
#include <getopt.h> /* optind */
#if ENABLE_FEATURE_TASKSET_FANCY
#define TASKSET_PRINTF_MASK "%s"
#define from_cpuset(x) __from_cpuset(&x)
/* craft a string from the mask */
static char *__from_cpuset(cpu_set_t *mask) {
int i;
char *ret = 0, *str = xzalloc(9);
for (i = CPU_SETSIZE - 4; i >= 0; i -= 4) {
char val = 0;
int off;
for (off = 0; off <= 3; ++off)
if (CPU_ISSET(i+off, mask))
val |= 1<<off;
if (!ret && val)
ret = str;
*str++ = (val-'0'<=9) ? (val+48) : (val+87);
}
return ret;
}
#else
#define TASKSET_PRINTF_MASK "%x"
#define from_cpuset(mask) mask
#endif
#define TASKSET_OPT_p (1)
int taskset_main(int argc, char** argv)
{
cpu_set_t mask, new_mask;
pid_t pid = 0;
unsigned long ul;
const char *state = "current\0new";
char *p_opt = NULL, *aff = NULL;
ul = getopt32(argc, argv, "+p:", &p_opt);
if (ul & TASKSET_OPT_p) {
if (argc == optind+1) { /* -p <aff> <pid> */
aff = p_opt;
p_opt = argv[optind];
}
argv += optind; /* me -p <arg> */
pid = xatoul_range(p_opt, 1, ULONG_MAX); /* -p <pid> */
} else
aff = *++argv; /* <aff> <cmd...> */
if (aff) {
unsigned i = 0;
unsigned long l = xstrtol_range(aff, 16, 1, ULONG_MAX);
CPU_ZERO(&new_mask);
while (i < CPU_SETSIZE && l >= (1<<i)) {
if ((1<<i) & l)
CPU_SET(i, &new_mask);
++i;
}
}
if (ul & TASKSET_OPT_p) {
print_aff:
if (sched_getaffinity(pid, sizeof (mask), &mask) < 0)
bb_perror_msg_and_die("Failed to %cet pid %d's affinity", 'g', pid);
printf("pid %d's %s affinity mask: "TASKSET_PRINTF_MASK"\n",
pid, state, from_cpuset(mask));
if (!*argv) /* no new affinity given or we did print already, done. */
return EXIT_SUCCESS;
}
if (sched_setaffinity(pid, sizeof (new_mask), &new_mask))
bb_perror_msg_and_die("Failed to %cet pid %d's affinity", 's', pid);
if (ul & TASKSET_OPT_p) {
state += 8;
++argv;
goto print_aff;
}
++argv;
execvp(*argv, argv);
bb_perror_msg_and_die("%s", *argv);
}
#undef TASKSET_OPT_p
#undef TASKSET_PRINTF_MASK
#undef from_cpuset
|
