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authorDenys Vlasenko <vda.linux@googlemail.com>2017-04-12 13:58:40 +0200
committerDenys Vlasenko <vda.linux@googlemail.com>2017-04-12 13:58:40 +0200
commit783d57af7bb2b851c16cf87df848e0365e5052da (patch)
tree71bb23e51b9cb40eac4a6fb831383134c1fc45a0 /miscutils/taskset.c
parentac47a00e2ec398b04c3141cd3434a6e4b95740b1 (diff)
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Sort some miscutils/ applets into coreutils or util-linux
No code changes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
Diffstat (limited to 'miscutils/taskset.c')
-rw-r--r--miscutils/taskset.c221
1 files changed, 0 insertions, 221 deletions
diff --git a/miscutils/taskset.c b/miscutils/taskset.c
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index 94a07383a..000000000
--- a/miscutils/taskset.c
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1/* vi: set sw=4 ts=4: */
2/*
3 * taskset - retrieve or set a processes' CPU affinity
4 * Copyright (c) 2006 Bernhard Reutner-Fischer
5 *
6 * Licensed under GPLv2 or later, see file LICENSE in this source tree.
7 */
8
9//config:config TASKSET
10//config: bool "taskset"
11//config: default y
12//config: help
13//config: Retrieve or set a processes's CPU affinity.
14//config: This requires sched_{g,s}etaffinity support in your libc.
15//config:
16//config:config FEATURE_TASKSET_FANCY
17//config: bool "Fancy output"
18//config: default y
19//config: depends on TASKSET
20//config: help
21//config: Needed for machines with more than 32-64 CPUs:
22//config: affinity parameter 0xHHHHHHHHHHHHHHHHHHHH can be arbitrarily long
23//config: in this case. Otherwise, it is limited to sizeof(long).
24
25//applet:IF_TASKSET(APPLET(taskset, BB_DIR_USR_BIN, BB_SUID_DROP))
26//kbuild:lib-$(CONFIG_TASKSET) += taskset.o
27
28//usage:#define taskset_trivial_usage
29//usage: "[-p] [HEXMASK] PID | PROG ARGS"
30//usage:#define taskset_full_usage "\n\n"
31//usage: "Set or get CPU affinity\n"
32//usage: "\n -p Operate on an existing PID"
33//usage:
34//usage:#define taskset_example_usage
35//usage: "$ taskset 0x7 ./dgemm_test&\n"
36//usage: "$ taskset -p 0x1 $!\n"
37//usage: "pid 4790's current affinity mask: 7\n"
38//usage: "pid 4790's new affinity mask: 1\n"
39//usage: "$ taskset 0x7 /bin/sh -c './taskset -p 0x1 $$'\n"
40//usage: "pid 6671's current affinity mask: 1\n"
41//usage: "pid 6671's new affinity mask: 1\n"
42//usage: "$ taskset -p 1\n"
43//usage: "pid 1's current affinity mask: 3\n"
44/*
45 * Not yet implemented:
46 * -a/--all-tasks (affect all threads)
47 * needs to get TIDs from /proc/PID/task/ and use _them_ as "pid" in sched_setaffinity(pid)
48 * -c/--cpu-list (specify CPUs via "1,3,5-7")
49 */
50
51#include <sched.h>
52#include "libbb.h"
53
54typedef unsigned long ul;
55#define SZOF_UL (unsigned)(sizeof(ul))
56#define BITS_UL (unsigned)(sizeof(ul)*8)
57#define MASK_UL (unsigned)(sizeof(ul)*8 - 1)
58
59#if ENABLE_FEATURE_TASKSET_FANCY
60#define TASKSET_PRINTF_MASK "%s"
61/* craft a string from the mask */
62static char *from_mask(const ul *mask, unsigned sz_in_bytes)
63{
64 char *str = xzalloc((sz_in_bytes+1) * 2); /* we will leak it */
65 char *p = str;
66 for (;;) {
67 ul v = *mask++;
68 if (SZOF_UL == 4)
69 p += sprintf(p, "%08lx", v);
70 if (SZOF_UL == 8)
71 p += sprintf(p, "%016lx", v);
72 if (SZOF_UL == 16)
73 p += sprintf(p, "%032lx", v); /* :) */
74 sz_in_bytes -= SZOF_UL;
75 if ((int)sz_in_bytes <= 0)
76 break;
77 }
78 while (str[0] == '0' && str[1])
79 str++;
80 return str;
81}
82#else
83#define TASKSET_PRINTF_MASK "%lx"
84static unsigned long long from_mask(ul *mask, unsigned sz_in_bytes UNUSED_PARAM)
85{
86 return *mask;
87}
88#endif
89
90static unsigned long *get_aff(int pid, unsigned *sz)
91{
92 int r;
93 unsigned long *mask = NULL;
94 unsigned sz_in_bytes = *sz;
95
96 for (;;) {
97 mask = xrealloc(mask, sz_in_bytes);
98 r = sched_getaffinity(pid, sz_in_bytes, (void*)mask);
99 if (r == 0)
100 break;
101 sz_in_bytes *= 2;
102 if (errno == EINVAL && (int)sz_in_bytes > 0)
103 continue;
104 bb_perror_msg_and_die("can't %cet pid %d's affinity", 'g', pid);
105 }
106 //bb_error_msg("get mask[0]:%lx sz_in_bytes:%d", mask[0], sz_in_bytes);
107 *sz = sz_in_bytes;
108 return mask;
109}
110
111int taskset_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
112int taskset_main(int argc UNUSED_PARAM, char **argv)
113{
114 ul *mask;
115 unsigned mask_size_in_bytes;
116 pid_t pid = 0;
117 unsigned opt_p;
118 const char *current_new;
119 char *aff;
120
121 /* NB: we mimic util-linux's taskset: -p does not take
122 * an argument, i.e., "-pN" is NOT valid, only "-p N"!
123 * Indeed, util-linux-2.13-pre7 uses:
124 * getopt_long(argc, argv, "+pchV", ...), not "...p:..." */
125
126 opt_complementary = "-1"; /* at least 1 arg */
127 opt_p = getopt32(argv, "+p");
128 argv += optind;
129
130 aff = *argv++;
131 if (opt_p) {
132 char *pid_str = aff;
133 if (*argv) { /* "-p <aff> <pid> ...rest.is.ignored..." */
134 pid_str = *argv; /* NB: *argv != NULL in this case */
135 }
136 /* else it was just "-p <pid>", and *argv == NULL */
137 pid = xatoul_range(pid_str, 1, ((unsigned)(pid_t)ULONG_MAX) >> 1);
138 } else {
139 /* <aff> <cmd...> */
140 if (!*argv)
141 bb_show_usage();
142 }
143
144 mask_size_in_bytes = SZOF_UL;
145 current_new = "current";
146 print_aff:
147 mask = get_aff(pid, &mask_size_in_bytes);
148 if (opt_p) {
149 printf("pid %d's %s affinity mask: "TASKSET_PRINTF_MASK"\n",
150 pid, current_new, from_mask(mask, mask_size_in_bytes));
151 if (*argv == NULL) {
152 /* Either it was just "-p <pid>",
153 * or it was "-p <aff> <pid>" and we came here
154 * for the second time (see goto below) */
155 return EXIT_SUCCESS;
156 }
157 *argv = NULL;
158 current_new = "new";
159 }
160 memset(mask, 0, mask_size_in_bytes);
161
162 /* Affinity was specified, translate it into mask */
163 /* it is always in hex, skip "0x" if it exists */
164 if (aff[0] == '0' && (aff[1]|0x20) == 'x')
165 aff += 2;
166
167 if (!ENABLE_FEATURE_TASKSET_FANCY) {
168 mask[0] = xstrtoul(aff, 16);
169 } else {
170 unsigned i;
171 char *last_char;
172
173 i = 0; /* bit pos in mask[] */
174
175 /* aff is ASCII hex string, accept very long masks in this form.
176 * Process hex string AABBCCDD... to ulong mask[]
177 * from the rightmost nibble, which is least-significant.
178 * Bits not fitting into mask[] are ignored: (example: 1234
179 * in 12340000000000000000000000000000000000000ff)
180 */
181 last_char = strchrnul(aff, '\0');
182 while (last_char > aff) {
183 char c;
184 ul val;
185
186 last_char--;
187 c = *last_char;
188 if (isdigit(c))
189 val = c - '0';
190 else if ((c|0x20) >= 'a' && (c|0x20) <= 'f')
191 val = (c|0x20) - ('a' - 10);
192 else
193 bb_error_msg_and_die("bad affinity '%s'", aff);
194
195 if (i < mask_size_in_bytes * 8) {
196 mask[i / BITS_UL] |= val << (i & MASK_UL);
197 //bb_error_msg("bit %d set", i);
198 }
199 /* else:
200 * We can error out here, but we don't.
201 * For one, kernel itself ignores bits in mask[]
202 * which do not map to any CPUs:
203 * if mask[] has one 32-bit long element,
204 * but you have only 8 CPUs, all bits beyond first 8
205 * are ignored, silently.
206 * No point in making bits past 31th to be errors.
207 */
208 i += 4;
209 }
210 }
211
212 /* Set pid's or our own (pid==0) affinity */
213 if (sched_setaffinity(pid, mask_size_in_bytes, (void*)mask))
214 bb_perror_msg_and_die("can't %cet pid %d's affinity", 's', pid);
215 //bb_error_msg("set mask[0]:%lx", mask[0]);
216
217 if (!argv[0]) /* "-p <aff> <pid> [...ignored...]" */
218 goto print_aff; /* print new affinity and exit */
219
220 BB_EXECVP_or_die(argv);
221}
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