[thirdparty/util-linux.git] / lib / cpuset.c

/*
 * Terminology:
 *
 *	cpuset	- (libc) cpu_set_t data structure represents set of CPUs
 *	cpumask	- string with hex mask (e.g. "0x00000001")
 *	cpulist - string with CPU ranges (e.g. "0-3,5,7,8")
 *
 * Based on code from taskset.c and Linux kernel.
 *
 * This file may be redistributed under the terms of the
 * GNU Lesser General Public License.
 *
 * Copyright (C) 2010 Karel Zak <kzak@redhat.com>
 */

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sched.h>
#include <errno.h>
#include <string.h>
#include <ctype.h>
#include <sys/syscall.h>

#include "cpuset.h"
#include "c.h"

static inline int val_to_char(int v)
{
	if (v >= 0 && v < 10)
		return '0' + v;
	else if (v >= 10 && v < 16)
		return ('a' - 10) + v;
	else
		return -1;
}

static inline int char_to_val(int c)
{
	int cl;

	cl = tolower(c);
	if (c >= '0' && c <= '9')
		return c - '0';
	else if (cl >= 'a' && cl <= 'f')
		return cl + (10 - 'a');
	else
		return -1;
}

static const char *nexttoken(const char *q,  int sep)
{
	if (q)
		q = strchr(q, sep);
	if (q)
		q++;
	return q;
}

/*
 * Number of bits in a CPU bitmask on current system
 */
int get_max_number_of_cpus(void)
{
#ifdef SYS_sched_getaffinity
	int n, cpus = 2048;
	size_t setsize;
	cpu_set_t *set = cpuset_alloc(cpus, &setsize, NULL);

	if (!set)
		return -1;	/* error */

	for (;;) {
		CPU_ZERO_S(setsize, set);

		/* the library version does not return size of cpumask_t */
		n = syscall(SYS_sched_getaffinity, 0, setsize, set);

		if (n < 0 && errno == EINVAL && cpus < 1024 * 1024) {
			cpuset_free(set);
			cpus *= 2;
			set = cpuset_alloc(cpus, &setsize, NULL);
			if (!set)
				return -1;	/* error */
			continue;
		}
		cpuset_free(set);
		return n * 8;
	}
#endif
	return -1;
}

/*
 * Allocates a new set for ncpus and returns size in bytes and size in bits
 */
cpu_set_t *cpuset_alloc(int ncpus, size_t *setsize, size_t *nbits)
{
	cpu_set_t *set = CPU_ALLOC(ncpus);

	if (!set)
		return NULL;
	if (setsize)
		*setsize = CPU_ALLOC_SIZE(ncpus);
	if (nbits)
		*nbits = cpuset_nbits(CPU_ALLOC_SIZE(ncpus));
	return set;
}

void cpuset_free(cpu_set_t *set)
{
	CPU_FREE(set);
}

#if !HAVE_DECL_CPU_ALLOC
/* Please, use CPU_COUNT_S() macro. This is fallback */
int __cpuset_count_s(size_t setsize, const cpu_set_t *set)
{
	int s = 0;
	const __cpu_mask *p = set->__bits;
	const __cpu_mask *end = &set->__bits[setsize / sizeof (__cpu_mask)];

	while (p < end) {
		__cpu_mask l = *p++;

		if (l == 0)
			continue;
# if LONG_BIT > 32
		l = (l & 0x5555555555555555ul) + ((l >> 1) & 0x5555555555555555ul);
		l = (l & 0x3333333333333333ul) + ((l >> 2) & 0x3333333333333333ul);
		l = (l & 0x0f0f0f0f0f0f0f0ful) + ((l >> 4) & 0x0f0f0f0f0f0f0f0ful);
		l = (l & 0x00ff00ff00ff00fful) + ((l >> 8) & 0x00ff00ff00ff00fful);
		l = (l & 0x0000ffff0000fffful) + ((l >> 16) & 0x0000ffff0000fffful);
		l = (l & 0x00000000fffffffful) + ((l >> 32) & 0x00000000fffffffful);
# else
		l = (l & 0x55555555ul) + ((l >> 1) & 0x55555555ul);
		l = (l & 0x33333333ul) + ((l >> 2) & 0x33333333ul);
		l = (l & 0x0f0f0f0ful) + ((l >> 4) & 0x0f0f0f0ful);
		l = (l & 0x00ff00fful) + ((l >> 8) & 0x00ff00fful);
		l = (l & 0x0000fffful) + ((l >> 16) & 0x0000fffful);
# endif
		s += l;
	}
	return s;
}
#endif

/*
 * Returns human readable representation of the cpuset. The output format is
 * a list of CPUs with ranges (for example, "0,1,3-9").
 */
char *cpulist_create(char *str, size_t len,
			cpu_set_t *set, size_t setsize)
{
	size_t i;
	char *ptr = str;
	int entry_made = 0;
	size_t max = cpuset_nbits(setsize);

	for (i = 0; i < max; i++) {
		if (CPU_ISSET_S(i, setsize, set)) {
			int rlen;
			size_t j, run = 0;
			entry_made = 1;
			for (j = i + 1; j < max; j++) {
				if (CPU_ISSET_S(j, setsize, set))
					run++;
				else
					break;
			}
			if (!run)
				rlen = snprintf(ptr, len, "%zu,", i);
			else if (run == 1) {
				rlen = snprintf(ptr, len, "%zu,%zu,", i, i + 1);
				i++;
			} else {
				rlen = snprintf(ptr, len, "%zu-%zu,", i, i + run);
				i += run;
			}
			if (rlen < 0 || (size_t) rlen >= len)
				return NULL;
			ptr += rlen;
			len -= rlen;
		}
	}
	ptr -= entry_made;
	*ptr = '\0';

	return str;
}

/*
 * Returns string with CPU mask.
 */
char *cpumask_create(char *str, size_t len,
			cpu_set_t *set, size_t setsize)
{
	char *ptr = str;
	char *ret = NULL;
	int cpu;

	for (cpu = cpuset_nbits(setsize) - 4; cpu >= 0; cpu -= 4) {
		char val = 0;

		if (len == (size_t) (ptr - str))
			break;

		if (CPU_ISSET_S(cpu, setsize, set))
			val |= 1;
		if (CPU_ISSET_S(cpu + 1, setsize, set))
			val |= 2;
		if (CPU_ISSET_S(cpu + 2, setsize, set))
			val |= 4;
		if (CPU_ISSET_S(cpu + 3, setsize, set))
			val |= 8;

		if (!ret && val)
			ret = ptr;
		*ptr++ = val_to_char(val);
	}
	*ptr = '\0';
	return ret ? ret : ptr - 1;
}

/*
 * Parses string with CPUs mask.
 */
int cpumask_parse(const char *str, cpu_set_t *set, size_t setsize)
{
	int len = strlen(str);
	const char *ptr = str + len - 1;
	int cpu = 0;

	/* skip 0x, it's all hex anyway */
	if (len > 1 && !memcmp(str, "0x", 2L))
		str += 2;

	CPU_ZERO_S(setsize, set);

	while (ptr >= str) {
		char val;

		/* cpu masks in /sys uses comma as a separator */
		if (*ptr == ',')
			ptr--;

		val = char_to_val(*ptr);
		if (val == (char) -1)
			return -1;
		if (val & 1)
			CPU_SET_S(cpu, setsize, set);
		if (val & 2)
			CPU_SET_S(cpu + 1, setsize, set);
		if (val & 4)
			CPU_SET_S(cpu + 2, setsize, set);
		if (val & 8)
			CPU_SET_S(cpu + 3, setsize, set);
		ptr--;
		cpu += 4;
	}

	return 0;
}

/*
 * Parses string with list of CPU ranges.
 * Returns 0 on success.
 * Returns 1 on error.
 * Returns 2 if fail is set and a cpu number passed in the list doesn't fit
 * into the cpu_set. If fail is not set cpu numbers that do not fit are
 * ignored and 0 is returned instead.
 */
int cpulist_parse(const char *str, cpu_set_t *set, size_t setsize, int fail)
{
	size_t max = cpuset_nbits(setsize);
	const char *p, *q;
	int r = 0;

	q = str;
	CPU_ZERO_S(setsize, set);

	while (p = q, q = nexttoken(q, ','), p) {
		unsigned int a;	/* beginning of range */
		unsigned int b;	/* end of range */
		unsigned int s;	/* stride */
		const char *c1, *c2;
		char c;

		if ((r = sscanf(p, "%u%c", &a, &c)) < 1)
			return 1;
		b = a;
		s = 1;

		c1 = nexttoken(p, '-');
		c2 = nexttoken(p, ',');
		if (c1 != NULL && (c2 == NULL || c1 < c2)) {
			if ((r = sscanf(c1, "%u%c", &b, &c)) < 1)
				return 1;
			c1 = nexttoken(c1, ':');
			if (c1 != NULL && (c2 == NULL || c1 < c2)) {
				if ((r = sscanf(c1, "%u%c", &s, &c)) < 1)
					return 1;
				if (s == 0)
					return 1;
			}
		}

		if (!(a <= b))
			return 1;
		while (a <= b) {
			if (fail && (a >= max))
				return 2;
			CPU_SET_S(a, setsize, set);
			a += s;
		}
	}

	if (r == 2)
		return 1;
	return 0;
}

#ifdef TEST_PROGRAM_CPUSET

#include <getopt.h>

int main(int argc, char *argv[])
{
	cpu_set_t *set;
	size_t setsize, buflen, nbits;
	char *buf, *mask = NULL, *range = NULL;
	int ncpus = 2048, rc, c;

	static const struct option longopts[] = {
	    { "ncpus", 1, NULL, 'n' },
	    { "mask",  1, NULL, 'm' },
	    { "range", 1, NULL, 'r' },
	    { NULL,    0, NULL, 0 }
	};

	while ((c = getopt_long(argc, argv, "n:m:r:", longopts, NULL)) != -1) {
		switch(c) {
		case 'n':
			ncpus = atoi(optarg);
			break;
		case 'm':
			mask = strdup(optarg);
			break;
		case 'r':
			range = strdup(optarg);
			break;
		default:
			goto usage_err;
		}
	}

	if (!mask && !range)
		goto usage_err;

	set = cpuset_alloc(ncpus, &setsize, &nbits);
	if (!set)
		err(EXIT_FAILURE, "failed to allocate cpu set");

	/*
	fprintf(stderr, "ncpus: %d, cpuset bits: %zd, cpuset bytes: %zd\n",
			ncpus, nbits, setsize);
	*/

	buflen = 7 * nbits;
	buf = malloc(buflen);
	if (!buf)
		err(EXIT_FAILURE, "failed to allocate cpu set buffer");

	if (mask)
		rc = cpumask_parse(mask, set, setsize);
	else
		rc = cpulist_parse(range, set, setsize, 0);

	if (rc)
		errx(EXIT_FAILURE, "failed to parse string: %s", mask ? : range);

	printf("%-15s = %15s ", mask ? : range,
				cpumask_create(buf, buflen, set, setsize));
	printf("[%s]\n", cpulist_create(buf, buflen, set, setsize));

	free(buf);
	free(mask);
	free(range);
	cpuset_free(set);

	return EXIT_SUCCESS;

usage_err:
	fprintf(stderr,
		"usage: %s [--ncpus <num>] --mask <mask> | --range <list>",
		program_invocation_short_name);
	exit(EXIT_FAILURE);
}
#endif
Commit	Line	Data
ff5a6d20 KZ	1	/*
	2	* Terminology:
	3	*
	4	* cpuset - (libc) cpu_set_t data structure represents set of CPUs
	5	* cpumask - string with hex mask (e.g. "0x00000001")
	6	* cpulist - string with CPU ranges (e.g. "0-3,5,7,8")
	7	*
	8	* Based on code from taskset.c and Linux kernel.
	9	*
0f23ee0c KZ	10	* This file may be redistributed under the terms of the
	11	* GNU Lesser General Public License.
	12	*
ff5a6d20 KZ	13	* Copyright (C) 2010 Karel Zak <kzak@redhat.com>
	14	*/
	15
efcb71f8 KZ	16	#include <stdio.h>
	17	#include <stdlib.h>
	18	#include <unistd.h>
efcb71f8 KZ	19	#include <sched.h>
	20	#include <errno.h>
	21	#include <string.h>
	22	#include <ctype.h>
bae91ecf	23	#include <sys/syscall.h>
efcb71f8 KZ	24
efcb71f8 KZ	25	#include "cpuset.h"
eb76ca98	26	#include "c.h"
efcb71f8 KZ	27
	28	static inline int val_to_char(int v)
	29	{
	30	if (v >= 0 && v < 10)
	31	return '0' + v;
	32	else if (v >= 10 && v < 16)
	33	return ('a' - 10) + v;
	34	else
	35	return -1;
	36	}
	37
efcb71f8 KZ	38	static inline int char_to_val(int c)
	39	{
	40	int cl;
	41
	42	cl = tolower(c);
	43	if (c >= '0' && c <= '9')
	44	return c - '0';
	45	else if (cl >= 'a' && cl <= 'f')
	46	return cl + (10 - 'a');
	47	else
	48	return -1;
	49	}
	50
	51	static const char nexttoken(const char q, int sep)
	52	{
	53	if (q)
	54	q = strchr(q, sep);
	55	if (q)
	56	q++;
	57	return q;
	58	}
	59
bae91ecf KZ	60	/*
	61	* Number of bits in a CPU bitmask on current system
	62	*/
	63	int get_max_number_of_cpus(void)
	64	{
4797b1e5	65	#ifdef SYS_sched_getaffinity
bae91ecf KZ	66	int n, cpus = 2048;
	67	size_t setsize;
	68	cpu_set_t *set = cpuset_alloc(cpus, &setsize, NULL);
	69
	70	if (!set)
	71	return -1; /* error */
	72
	73	for (;;) {
	74	CPU_ZERO_S(setsize, set);
	75
	76	/* the library version does not return size of cpumask_t */
	77	n = syscall(SYS_sched_getaffinity, 0, setsize, set);
	78
	79	if (n < 0 && errno == EINVAL && cpus < 1024 * 1024) {
	80	cpuset_free(set);
	81	cpus *= 2;
	82	set = cpuset_alloc(cpus, &setsize, NULL);
	83	if (!set)
	84	return -1; /* error */
	85	continue;
	86	}
	87	cpuset_free(set);
	88	return n * 8;
	89	}
4797b1e5	90	#endif
bae91ecf KZ	91	return -1;
	92	}
	93
ff5a6d20 KZ	94	/*
	95	* Allocates a new set for ncpus and returns size in bytes and size in bits
	96	*/
	97	cpu_set_t cpuset_alloc(int ncpus, size_t setsize, size_t *nbits)
	98	{
	99	cpu_set_t *set = CPU_ALLOC(ncpus);
	100
	101	if (!set)
	102	return NULL;
	103	if (setsize)
	104	*setsize = CPU_ALLOC_SIZE(ncpus);
	105	if (nbits)
	106	*nbits = cpuset_nbits(CPU_ALLOC_SIZE(ncpus));
	107	return set;
	108	}
	109
	110	void cpuset_free(cpu_set_t *set)
	111	{
	112	CPU_FREE(set);
	113	}
	114
ee32c514 KZ	115	#if !HAVE_DECL_CPU_ALLOC
	116	/* Please, use CPU_COUNT_S() macro. This is fallback */
	117	int __cpuset_count_s(size_t setsize, const cpu_set_t *set)
	118	{
	119	int s = 0;
	120	const __cpu_mask *p = set->__bits;
	121	const __cpu_mask *end = &set->__bits[setsize / sizeof (__cpu_mask)];
	122
	123	while (p < end) {
	124	__cpu_mask l = *p++;
	125
	126	if (l == 0)
	127	continue;
	128	# if LONG_BIT > 32
	129	l = (l & 0x5555555555555555ul) + ((l >> 1) & 0x5555555555555555ul);
	130	l = (l & 0x3333333333333333ul) + ((l >> 2) & 0x3333333333333333ul);
	131	l = (l & 0x0f0f0f0f0f0f0f0ful) + ((l >> 4) & 0x0f0f0f0f0f0f0f0ful);
	132	l = (l & 0x00ff00ff00ff00fful) + ((l >> 8) & 0x00ff00ff00ff00fful);
	133	l = (l & 0x0000ffff0000fffful) + ((l >> 16) & 0x0000ffff0000fffful);
	134	l = (l & 0x00000000fffffffful) + ((l >> 32) & 0x00000000fffffffful);
	135	# else
	136	l = (l & 0x55555555ul) + ((l >> 1) & 0x55555555ul);
	137	l = (l & 0x33333333ul) + ((l >> 2) & 0x33333333ul);
	138	l = (l & 0x0f0f0f0ful) + ((l >> 4) & 0x0f0f0f0ful);
	139	l = (l & 0x00ff00fful) + ((l >> 8) & 0x00ff00fful);
	140	l = (l & 0x0000fffful) + ((l >> 16) & 0x0000fffful);
	141	# endif
	142	s += l;
	143	}
	144	return s;
	145	}
	146	#endif
	147
ff5a6d20 KZ	148	/*
	149	* Returns human readable representation of the cpuset. The output format is
	150	* a list of CPUs with ranges (for example, "0,1,3-9").
	151	*/
	152	char cpulist_create(char str, size_t len,
	153	cpu_set_t *set, size_t setsize)
efcb71f8	154	{
8a929ed7	155	size_t i;
efcb71f8 KZ	156	char *ptr = str;
efcb71f8 KZ	157	int entry_made = 0;
ff5a6d20	158	size_t max = cpuset_nbits(setsize);
efcb71f8	159
ff5a6d20 KZ	160	for (i = 0; i < max; i++) {
ff5a6d20 KZ	161	if (CPU_ISSET_S(i, setsize, set)) {
8a929ed7 KZ	162	int rlen;
8a929ed7 KZ	163	size_t j, run = 0;
efcb71f8	164	entry_made = 1;
ff5a6d20 KZ	165	for (j = i + 1; j < max; j++) {
ff5a6d20 KZ	166	if (CPU_ISSET_S(j, setsize, set))
efcb71f8 KZ	167	run++;
	168	else
	169	break;
	170	}
	171	if (!run)
e3ca1312	172	rlen = snprintf(ptr, len, "%zu,", i);
efcb71f8	173	else if (run == 1) {
e3ca1312	174	rlen = snprintf(ptr, len, "%zu,%zu,", i, i + 1);
efcb71f8 KZ	175	i++;
efcb71f8 KZ	176	} else {
e3ca1312	177	rlen = snprintf(ptr, len, "%zu-%zu,", i, i + run);
efcb71f8 KZ	178	i += run;
efcb71f8 KZ	179	}
06fa5817	180	if (rlen < 0 \|\| (size_t) rlen >= len)
ff5a6d20 KZ	181	return NULL;
ff5a6d20 KZ	182	ptr += rlen;
06fa5817	183	len -= rlen;
efcb71f8 KZ	184	}
	185	}
	186	ptr -= entry_made;
ff5a6d20	187	*ptr = '\0';
efcb71f8 KZ	188
	189	return str;
	190	}
	191
ff5a6d20 KZ	192	/*
	193	* Returns string with CPU mask.
	194	*/
	195	char cpumask_create(char str, size_t len,
	196	cpu_set_t *set, size_t setsize)
efcb71f8	197	{
efcb71f8	198	char *ptr = str;
ff5a6d20 KZ	199	char *ret = NULL;
ff5a6d20 KZ	200	int cpu;
efcb71f8	201
ff5a6d20	202	for (cpu = cpuset_nbits(setsize) - 4; cpu >= 0; cpu -= 4) {
efcb71f8	203	char val = 0;
ff5a6d20	204
8a929ed7	205	if (len == (size_t) (ptr - str))
ff5a6d20 KZ	206	break;
	207
	208	if (CPU_ISSET_S(cpu, setsize, set))
efcb71f8	209	val \|= 1;
ff5a6d20	210	if (CPU_ISSET_S(cpu + 1, setsize, set))
efcb71f8	211	val \|= 2;
ff5a6d20	212	if (CPU_ISSET_S(cpu + 2, setsize, set))
efcb71f8	213	val \|= 4;
ff5a6d20	214	if (CPU_ISSET_S(cpu + 3, setsize, set))
efcb71f8	215	val \|= 8;
ff5a6d20	216
efcb71f8 KZ	217	if (!ret && val)
	218	ret = ptr;
	219	*ptr++ = val_to_char(val);
	220	}
ff5a6d20	221	*ptr = '\0';
efcb71f8 KZ	222	return ret ? ret : ptr - 1;
	223	}
	224
ff5a6d20	225	/*
68845fed	226	* Parses string with CPUs mask.
ff5a6d20 KZ	227	*/
ff5a6d20 KZ	228	int cpumask_parse(const char str, cpu_set_t set, size_t setsize)
efcb71f8 KZ	229	{
	230	int len = strlen(str);
	231	const char *ptr = str + len - 1;
ff5a6d20	232	int cpu = 0;
efcb71f8 KZ	233
	234	/* skip 0x, it's all hex anyway */
	235	if (len > 1 && !memcmp(str, "0x", 2L))
	236	str += 2;
	237
ff5a6d20 KZ	238	CPU_ZERO_S(setsize, set);
ff5a6d20 KZ	239
efcb71f8	240	while (ptr >= str) {
bae91ecf KZ	241	char val;
	242
	243	/* cpu masks in /sys uses comma as a separator */
	244	if (*ptr == ',')
	245	ptr--;
	246
	247	val = char_to_val(*ptr);
efcb71f8 KZ	248	if (val == (char) -1)
	249	return -1;
	250	if (val & 1)
ff5a6d20	251	CPU_SET_S(cpu, setsize, set);
efcb71f8	252	if (val & 2)
ff5a6d20	253	CPU_SET_S(cpu + 1, setsize, set);
efcb71f8	254	if (val & 4)
ff5a6d20	255	CPU_SET_S(cpu + 2, setsize, set);
efcb71f8	256	if (val & 8)
ff5a6d20	257	CPU_SET_S(cpu + 3, setsize, set);
efcb71f8	258	ptr--;
ff5a6d20	259	cpu += 4;
efcb71f8 KZ	260	}
	261
	262	return 0;
	263	}
	264
ff5a6d20	265	/*
68845fed	266	* Parses string with list of CPU ranges.
59fb133a HC	267	* Returns 0 on success.
	268	* Returns 1 on error.
	269	* Returns 2 if fail is set and a cpu number passed in the list doesn't fit
	270	* into the cpu_set. If fail is not set cpu numbers that do not fit are
	271	* ignored and 0 is returned instead.
ff5a6d20	272	*/
b16f615a	273	int cpulist_parse(const char str, cpu_set_t set, size_t setsize, int fail)
efcb71f8	274	{
b16f615a	275	size_t max = cpuset_nbits(setsize);
efcb71f8	276	const char p, q;
4e9b3bfd	277	int r = 0;
ff5a6d20	278
f27ce071	279	q = str;
ff5a6d20	280	CPU_ZERO_S(setsize, set);
efcb71f8 KZ	281
	282	while (p = q, q = nexttoken(q, ','), p) {
	283	unsigned int a; /* beginning of range */
	284	unsigned int b; /* end of range */
	285	unsigned int s; /* stride */
	286	const char c1, c2;
f27ce071	287	char c;
efcb71f8	288
f27ce071	289	if ((r = sscanf(p, "%u%c", &a, &c)) < 1)
efcb71f8 KZ	290	return 1;
	291	b = a;
	292	s = 1;
	293
	294	c1 = nexttoken(p, '-');
	295	c2 = nexttoken(p, ',');
	296	if (c1 != NULL && (c2 == NULL \|\| c1 < c2)) {
f27ce071	297	if ((r = sscanf(c1, "%u%c", &b, &c)) < 1)
efcb71f8 KZ	298	return 1;
efcb71f8 KZ	299	c1 = nexttoken(c1, ':');
289127f5	300	if (c1 != NULL && (c2 == NULL \|\| c1 < c2)) {
f27ce071	301	if ((r = sscanf(c1, "%u%c", &s, &c)) < 1)
efcb71f8	302	return 1;
72232a26 HC	303	if (s == 0)
72232a26 HC	304	return 1;
efcb71f8 KZ	305	}
	306	}
	307
	308	if (!(a <= b))
	309	return 1;
	310	while (a <= b) {
b16f615a	311	if (fail && (a >= max))
59fb133a	312	return 2;
ff5a6d20	313	CPU_SET_S(a, setsize, set);
efcb71f8 KZ	314	a += s;
	315	}
	316	}
	317
f27ce071 HC	318	if (r == 2)
f27ce071 HC	319	return 1;
efcb71f8 KZ	320	return 0;
efcb71f8 KZ	321	}
125b6a91	322
e8f7acb0	323	#ifdef TEST_PROGRAM_CPUSET
125b6a91	324
125b6a91 KZ	325	#include <getopt.h>
	326
	327	int main(int argc, char *argv[])
	328	{
ff5a6d20 KZ	329	cpu_set_t *set;
ff5a6d20 KZ	330	size_t setsize, buflen, nbits;
125b6a91 KZ	331	char buf, mask = NULL, *range = NULL;
	332	int ncpus = 2048, rc, c;
	333
6c7d5ae9	334	static const struct option longopts[] = {
71f08e97 SK	335	{ "ncpus", 1, NULL, 'n' },
	336	{ "mask", 1, NULL, 'm' },
	337	{ "range", 1, NULL, 'r' },
	338	{ NULL, 0, NULL, 0 }
125b6a91 KZ	339	};
	340
	341	while ((c = getopt_long(argc, argv, "n:m:r:", longopts, NULL)) != -1) {
	342	switch(c) {
	343	case 'n':
	344	ncpus = atoi(optarg);
	345	break;
	346	case 'm':
	347	mask = strdup(optarg);
	348	break;
	349	case 'r':
	350	range = strdup(optarg);
	351	break;
	352	default:
	353	goto usage_err;
	354	}
	355	}
	356
	357	if (!mask && !range)
	358	goto usage_err;
	359
ff5a6d20	360	set = cpuset_alloc(ncpus, &setsize, &nbits);
125b6a91 KZ	361	if (!set)
	362	err(EXIT_FAILURE, "failed to allocate cpu set");
	363
ff5a6d20 KZ	364	/*
	365	fprintf(stderr, "ncpus: %d, cpuset bits: %zd, cpuset bytes: %zd\n",
	366	ncpus, nbits, setsize);
	367	*/
	368
	369	buflen = 7 * nbits;
	370	buf = malloc(buflen);
125b6a91 KZ	371	if (!buf)
	372	err(EXIT_FAILURE, "failed to allocate cpu set buffer");
	373
	374	if (mask)
ff5a6d20	375	rc = cpumask_parse(mask, set, setsize);
125b6a91	376	else
b16f615a	377	rc = cpulist_parse(range, set, setsize, 0);
125b6a91 KZ	378
	379	if (rc)
	380	errx(EXIT_FAILURE, "failed to parse string: %s", mask ? : range);
	381
ff5a6d20 KZ	382	printf("%-15s = %15s ", mask ? : range,
	383	cpumask_create(buf, buflen, set, setsize));
	384	printf("[%s]\n", cpulist_create(buf, buflen, set, setsize));
125b6a91 KZ	385
125b6a91 KZ	386	free(buf);
41cd1503	387	free(mask);
9da2972c	388	free(range);
ff5a6d20	389	cpuset_free(set);
125b6a91 KZ	390
	391	return EXIT_SUCCESS;
	392
	393	usage_err:
	394	fprintf(stderr,
	395	"usage: %s [--ncpus <num>] --mask <mask> \| --range <list>",
	396	program_invocation_short_name);
	397	exit(EXIT_FAILURE);
	398	}
	399	#endif