perf tools: Group VDSO global variables into a structure

#include "linux/string.h"

#include "debug.h"

static bool vdso_found;

static char vdso_file[] = "/tmp/perf-vdso.so-XXXXXX";

#define VDSO__TEMP_FILE_NAME "/tmp/perf-vdso.so-XXXXXX"

struct vdso_file {

	bool found;

	bool error;

	char temp_file_name[sizeof(VDSO__TEMP_FILE_NAME)];

	const char *dso_name;

};

struct vdso_info {

	struct vdso_file vdso;

};

static struct vdso_info vdso_info_ = {

	.vdso = {

		.temp_file_name = VDSO__TEMP_FILE_NAME,

		.dso_name = VDSO__MAP_NAME,

	},

};

static struct vdso_info *vdso_info = &vdso_info_;

static int find_vdso_map(void **start, void **end)

{

	return !found;

}

static char *get_file(void)

static char *get_file(struct vdso_file *vdso_file)

{

	char *vdso = NULL;

	char *buf = NULL;

	size_t size;

	int fd;

	if (vdso_found)

		return vdso_file;

	if (vdso_file->found)

		return vdso_file->temp_file_name;

	if (find_vdso_map(&start, &end))

	if (vdso_file->error || find_vdso_map(&start, &end))

		return NULL;

	size = end - start;

	if (!buf)

		return NULL;

	fd = mkstemp(vdso_file);

	fd = mkstemp(vdso_file->temp_file_name);

	if (fd < 0)

		goto out;

	if (size == (size_t) write(fd, buf, size))

		vdso = vdso_file;

		vdso = vdso_file->temp_file_name;

	close(fd);

 out:

	free(buf);

	vdso_found = (vdso != NULL);

	vdso_file->found = (vdso != NULL);

	vdso_file->error = !vdso_file->found;

	return vdso;

}

void vdso__exit(void)

{

	if (vdso_found)

		unlink(vdso_file);

	if (vdso_info->vdso.found)

		unlink(vdso_info->vdso.temp_file_name);

}

struct dso *vdso__dso_findnew(struct machine *machine)

	if (!dso) {

		char *file;

		file = get_file();

		file = get_file(&vdso_info->vdso);

		if (!file)

			return NULL;