/* Utility functions for reading sysfs values */

#define _GNU_SOURCE 1

#include <stdio.h>

#include <sys/fcntl.h>

#include <stdlib.h>

#include <unistd.h>

#include <stdarg.h>

#include <ctype.h>

#include "numa.h"

#include "numaint.h"

#define SYSFS_BLOCK 4096

hidden char *sysfs_read(char *name)

{

	char *buf;

	int n;

	int fd;

	fd = open(name, O_RDONLY);

	buf = malloc(SYSFS_BLOCK);

	if (!buf)

		return NULL;

	n = read(fd, buf, SYSFS_BLOCK - 1);

	close(fd);

	if (n <= 0) {

		free(buf);

		return NULL;

	}

	buf[n] = 0;

	return buf;

}

hidden int sysfs_node_read(struct bitmask *mask, char *fmt, ...)

{

	int n;

	va_list ap;

	char *p, *fn, *m, *end;

	int num;

	va_start(ap, fmt);

	n = vasprintf(&fn, fmt, ap);

	va_end(ap);

	if (n < 0)

		return -1;

	p = sysfs_read(fn);

	free(fn);

	if (!p)

		return -1;

	m = p;

	do {

		num = strtol(m, &end, 0);

		if (m == end)

			return -1;

		if (num < 0)

			return -2;

		if (num >= numa_num_task_nodes())

			return -1;

		numa_bitmask_setbit(mask, num);

		/* Continuation not supported by kernel yet. */

		m = end;

		while (isspace(*m) || *m == ',')

			m++;

	} while (isdigit(*m));

	free(p);

	return 0;

}