[linux-2.6-block.git] / tools / perf / util / util.c

#include "../perf.h"
#include "util.h"
#include "debug.h"
#include <api/fs/fs.h>
#include <sys/mman.h>
#include <sys/stat.h>
#include <sys/utsname.h>
#include <dirent.h>
#include <inttypes.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <limits.h>
#include <linux/kernel.h>
#include <linux/log2.h>
#include <linux/time64.h>
#include <unistd.h>
#include "strlist.h"

/*
 * XXX We need to find a better place for these things...
 */
unsigned int page_size;
int cacheline_size;

int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;

bool test_attr__enabled;

bool perf_host  = true;
bool perf_guest = false;

void event_attr_init(struct perf_event_attr *attr)
{
	if (!perf_host)
		attr->exclude_host  = 1;
	if (!perf_guest)
		attr->exclude_guest = 1;
	/* to capture ABI version */
	attr->size = sizeof(*attr);
}

int mkdir_p(char *path, mode_t mode)
{
	struct stat st;
	int err;
	char *d = path;

	if (*d != '/')
		return -1;

	if (stat(path, &st) == 0)
		return 0;

	while (*++d == '/');

	while ((d = strchr(d, '/'))) {
		*d = '\0';
		err = stat(path, &st) && mkdir(path, mode);
		*d++ = '/';
		if (err)
			return -1;
		while (*d == '/')
			++d;
	}
	return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
}

int rm_rf(const char *path)
{
	DIR *dir;
	int ret = 0;
	struct dirent *d;
	char namebuf[PATH_MAX];

	dir = opendir(path);
	if (dir == NULL)
		return 0;

	while ((d = readdir(dir)) != NULL && !ret) {
		struct stat statbuf;

		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
			continue;

		scnprintf(namebuf, sizeof(namebuf), "%s/%s",
			  path, d->d_name);

		/* We have to check symbolic link itself */
		ret = lstat(namebuf, &statbuf);
		if (ret < 0) {
			pr_debug("stat failed: %s\n", namebuf);
			break;
		}

		if (S_ISDIR(statbuf.st_mode))
			ret = rm_rf(namebuf);
		else
			ret = unlink(namebuf);
	}
	closedir(dir);

	if (ret < 0)
		return ret;

	return rmdir(path);
}

/* A filter which removes dot files */
bool lsdir_no_dot_filter(const char *name __maybe_unused, struct dirent *d)
{
	return d->d_name[0] != '.';
}

/* lsdir reads a directory and store it in strlist */
struct strlist *lsdir(const char *name,
		      bool (*filter)(const char *, struct dirent *))
{
	struct strlist *list = NULL;
	DIR *dir;
	struct dirent *d;

	dir = opendir(name);
	if (!dir)
		return NULL;

	list = strlist__new(NULL, NULL);
	if (!list) {
		errno = ENOMEM;
		goto out;
	}

	while ((d = readdir(dir)) != NULL) {
		if (!filter || filter(name, d))
			strlist__add(list, d->d_name);
	}

out:
	closedir(dir);
	return list;
}

static int slow_copyfile(const char *from, const char *to, struct nsinfo *nsi)
{
	int err = -1;
	char *line = NULL;
	size_t n;
	FILE *from_fp, *to_fp;
	struct nscookie nsc;

	nsinfo__mountns_enter(nsi, &nsc);
	from_fp = fopen(from, "r");
	nsinfo__mountns_exit(&nsc);
	if (from_fp == NULL)
		goto out;

	to_fp = fopen(to, "w");
	if (to_fp == NULL)
		goto out_fclose_from;

	while (getline(&line, &n, from_fp) > 0)
		if (fputs(line, to_fp) == EOF)
			goto out_fclose_to;
	err = 0;
out_fclose_to:
	fclose(to_fp);
	free(line);
out_fclose_from:
	fclose(from_fp);
out:
	return err;
}

int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
{
	void *ptr;
	loff_t pgoff;

	pgoff = off_in & ~(page_size - 1);
	off_in -= pgoff;

	ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
	if (ptr == MAP_FAILED)
		return -1;

	while (size) {
		ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
		if (ret < 0 && errno == EINTR)
			continue;
		if (ret <= 0)
			break;

		size -= ret;
		off_in += ret;
		off_out -= ret;
	}
	munmap(ptr, off_in + size);

	return size ? -1 : 0;
}

static int copyfile_mode_ns(const char *from, const char *to, mode_t mode,
			    struct nsinfo *nsi)
{
	int fromfd, tofd;
	struct stat st;
	int err;
	char *tmp = NULL, *ptr = NULL;
	struct nscookie nsc;

	nsinfo__mountns_enter(nsi, &nsc);
	err = stat(from, &st);
	nsinfo__mountns_exit(&nsc);
	if (err)
		goto out;
	err = -1;

	/* extra 'x' at the end is to reserve space for '.' */
	if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
		tmp = NULL;
		goto out;
	}
	ptr = strrchr(tmp, '/');
	if (!ptr)
		goto out;
	ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
	*ptr = '.';

	tofd = mkstemp(tmp);
	if (tofd < 0)
		goto out;

	if (fchmod(tofd, mode))
		goto out_close_to;

	if (st.st_size == 0) { /* /proc? do it slowly... */
		err = slow_copyfile(from, tmp, nsi);
		goto out_close_to;
	}

	nsinfo__mountns_enter(nsi, &nsc);
	fromfd = open(from, O_RDONLY);
	nsinfo__mountns_exit(&nsc);
	if (fromfd < 0)
		goto out_close_to;

	err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);

	close(fromfd);
out_close_to:
	close(tofd);
	if (!err)
		err = link(tmp, to);
	unlink(tmp);
out:
	free(tmp);
	return err;
}

int copyfile_ns(const char *from, const char *to, struct nsinfo *nsi)
{
	return copyfile_mode_ns(from, to, 0755, nsi);
}

int copyfile_mode(const char *from, const char *to, mode_t mode)
{
	return copyfile_mode_ns(from, to, mode, NULL);
}

int copyfile(const char *from, const char *to)
{
	return copyfile_mode(from, to, 0755);
}

static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
{
	void *buf_start = buf;
	size_t left = n;

	while (left) {
		ssize_t ret = is_read ? read(fd, buf, left) :
					write(fd, buf, left);

		if (ret < 0 && errno == EINTR)
			continue;
		if (ret <= 0)
			return ret;

		left -= ret;
		buf  += ret;
	}

	BUG_ON((size_t)(buf - buf_start) != n);
	return n;
}

/*
 * Read exactly 'n' bytes or return an error.
 */
ssize_t readn(int fd, void *buf, size_t n)
{
	return ion(true, fd, buf, n);
}

/*
 * Write exactly 'n' bytes or return an error.
 */
ssize_t writen(int fd, void *buf, size_t n)
{
	return ion(false, fd, buf, n);
}

size_t hex_width(u64 v)
{
	size_t n = 1;

	while ((v >>= 4))
		++n;

	return n;
}

static int hex(char ch)
{
	if ((ch >= '0') && (ch <= '9'))
		return ch - '0';
	if ((ch >= 'a') && (ch <= 'f'))
		return ch - 'a' + 10;
	if ((ch >= 'A') && (ch <= 'F'))
		return ch - 'A' + 10;
	return -1;
}

/*
 * While we find nice hex chars, build a long_val.
 * Return number of chars processed.
 */
int hex2u64(const char *ptr, u64 *long_val)
{
	const char *p = ptr;
	*long_val = 0;

	while (*p) {
		const int hex_val = hex(*p);

		if (hex_val < 0)
			break;

		*long_val = (*long_val << 4) | hex_val;
		p++;
	}

	return p - ptr;
}

int perf_event_paranoid(void)
{
	int value;

	if (sysctl__read_int("kernel/perf_event_paranoid", &value))
		return INT_MAX;

	return value;
}
static int
fetch_ubuntu_kernel_version(unsigned int *puint)
{
	ssize_t len;
	size_t line_len = 0;
	char *ptr, *line = NULL;
	int version, patchlevel, sublevel, err;
	FILE *vsig;

	if (!puint)
		return 0;

	vsig = fopen("/proc/version_signature", "r");
	if (!vsig) {
		pr_debug("Open /proc/version_signature failed: %s\n",
			 strerror(errno));
		return -1;
	}

	len = getline(&line, &line_len, vsig);
	fclose(vsig);
	err = -1;
	if (len <= 0) {
		pr_debug("Reading from /proc/version_signature failed: %s\n",
			 strerror(errno));
		goto errout;
	}

	ptr = strrchr(line, ' ');
	if (!ptr) {
		pr_debug("Parsing /proc/version_signature failed: %s\n", line);
		goto errout;
	}

	err = sscanf(ptr + 1, "%d.%d.%d",
		     &version, &patchlevel, &sublevel);
	if (err != 3) {
		pr_debug("Unable to get kernel version from /proc/version_signature '%s'\n",
			 line);
		goto errout;
	}

	*puint = (version << 16) + (patchlevel << 8) + sublevel;
	err = 0;
errout:
	free(line);
	return err;
}

int
fetch_kernel_version(unsigned int *puint, char *str,
		     size_t str_size)
{
	struct utsname utsname;
	int version, patchlevel, sublevel, err;
	bool int_ver_ready = false;

	if (access("/proc/version_signature", R_OK) == 0)
		if (!fetch_ubuntu_kernel_version(puint))
			int_ver_ready = true;

	if (uname(&utsname))
		return -1;

	if (str && str_size) {
		strncpy(str, utsname.release, str_size);
		str[str_size - 1] = '\0';
	}

	if (!puint || int_ver_ready)
		return 0;

	err = sscanf(utsname.release, "%d.%d.%d",
		     &version, &patchlevel, &sublevel);

	if (err != 3) {
		pr_debug("Unable to get kernel version from uname '%s'\n",
			 utsname.release);
		return -1;
	}

	*puint = (version << 16) + (patchlevel << 8) + sublevel;
	return 0;
}

const char *perf_tip(const char *dirpath)
{
	struct strlist *tips;
	struct str_node *node;
	char *tip = NULL;
	struct strlist_config conf = {
		.dirname = dirpath,
		.file_only = true,
	};

	tips = strlist__new("tips.txt", &conf);
	if (tips == NULL)
		return errno == ENOENT ? NULL :
			"Tip: check path of tips.txt or get more memory! ;-p";

	if (strlist__nr_entries(tips) == 0)
		goto out;

	node = strlist__entry(tips, random() % strlist__nr_entries(tips));
	if (asprintf(&tip, "Tip: %s", node->s) < 0)
		tip = (char *)"Tip: get more memory! ;-)";

out:
	strlist__delete(tips);

	return tip;
}
Commit	Line	Data
1aed2671	1	#include "../perf.h"
4cf40131	2	#include "util.h"
84f5d36f	3	#include "debug.h"
cd0cfad7	4	#include <api/fs/fs.h>
69e3f52d	5	#include <sys/mman.h>
7a8ef4c4	6	#include <sys/stat.h>
07bc5c69	7	#include <sys/utsname.h>
76b31a29	8	#include <dirent.h>
fd20e811	9	#include <inttypes.h>
9607ad3a	10	#include <signal.h>
dc4552bf ACM	11	#include <stdio.h>
dc4552bf ACM	12	#include <stdlib.h>
cef82c9f JO	13	#include <string.h>
cef82c9f JO	14	#include <errno.h>
1a47245d	15	#include <limits.h>
838d1452	16	#include <linux/kernel.h>
c339b1a9	17	#include <linux/log2.h>
bd48c63e	18	#include <linux/time64.h>
9398c484	19	#include <unistd.h>
14cbfbeb	20	#include "strlist.h"
23aadb1f	21
1aed2671 JR	22	/*
	23	* XXX We need to find a better place for these things...
	24	*/
0c1fe6b2	25	unsigned int page_size;
2b1b7100	26	int cacheline_size;
0c1fe6b2	27
a29d5c9b ACM	28	int sysctl_perf_event_max_stack = PERF_MAX_STACK_DEPTH;
a29d5c9b ACM	29	int sysctl_perf_event_max_contexts_per_stack = PERF_MAX_CONTEXTS_PER_STACK;
4cb93446	30
0c6332e9 ACM	31	bool test_attr__enabled;
0c6332e9 ACM	32
1aed2671	33	bool perf_host = true;
c4a7dca9	34	bool perf_guest = false;
1aed2671 JR	35
	36	void event_attr_init(struct perf_event_attr *attr)
	37	{
	38	if (!perf_host)
	39	attr->exclude_host = 1;
	40	if (!perf_guest)
	41	attr->exclude_guest = 1;
7e1ccd38 SE	42	/* to capture ABI version */
7e1ccd38 SE	43	attr->size = sizeof(*attr);
1aed2671 JR	44	}
1aed2671 JR	45
4cf40131 ACM	46	int mkdir_p(char *path, mode_t mode)
	47	{
	48	struct stat st;
	49	int err;
	50	char *d = path;
	51
	52	if (*d != '/')
	53	return -1;
	54
	55	if (stat(path, &st) == 0)
	56	return 0;
	57
	58	while (*++d == '/');
	59
	60	while ((d = strchr(d, '/'))) {
	61	*d = '\0';
	62	err = stat(path, &st) && mkdir(path, mode);
	63	*d++ = '/';
	64	if (err)
	65	return -1;
	66	while (*d == '/')
	67	++d;
	68	}
	69	return (stat(path, &st) && mkdir(path, mode)) ? -1 : 0;
	70	}
	71
9a9c733d	72	int rm_rf(const char *path)
0b1de0be NK	73	{
	74	DIR *dir;
	75	int ret = 0;
	76	struct dirent *d;
	77	char namebuf[PATH_MAX];
	78
	79	dir = opendir(path);
	80	if (dir == NULL)
	81	return 0;
	82
	83	while ((d = readdir(dir)) != NULL && !ret) {
	84	struct stat statbuf;
	85
	86	if (!strcmp(d->d_name, ".") \|\| !strcmp(d->d_name, ".."))
	87	continue;
	88
	89	scnprintf(namebuf, sizeof(namebuf), "%s/%s",
	90	path, d->d_name);
	91
2a1ef032 MH	92	/* We have to check symbolic link itself */
2a1ef032 MH	93	ret = lstat(namebuf, &statbuf);
0b1de0be NK	94	if (ret < 0) {
	95	pr_debug("stat failed: %s\n", namebuf);
	96	break;
	97	}
	98
2a1ef032	99	if (S_ISDIR(statbuf.st_mode))
0b1de0be	100	ret = rm_rf(namebuf);
2a1ef032 MH	101	else
2a1ef032 MH	102	ret = unlink(namebuf);
0b1de0be NK	103	}
	104	closedir(dir);
	105
	106	if (ret < 0)
	107	return ret;
	108
	109	return rmdir(path);
	110	}
	111
e1ce726e MH	112	/* A filter which removes dot files */
	113	bool lsdir_no_dot_filter(const char name __maybe_unused, struct dirent d)
	114	{
	115	return d->d_name[0] != '.';
	116	}
	117
	118	/* lsdir reads a directory and store it in strlist */
	119	struct strlist lsdir(const char name,
	120	bool (filter)(const char , struct dirent *))
	121	{
	122	struct strlist *list = NULL;
	123	DIR *dir;
	124	struct dirent *d;
	125
	126	dir = opendir(name);
	127	if (!dir)
	128	return NULL;
	129
	130	list = strlist__new(NULL, NULL);
	131	if (!list) {
357a54f3	132	errno = ENOMEM;
e1ce726e MH	133	goto out;
	134	}
	135
	136	while ((d = readdir(dir)) != NULL) {
	137	if (!filter \|\| filter(name, d))
	138	strlist__add(list, d->d_name);
	139	}
	140
	141	out:
	142	closedir(dir);
	143	return list;
	144	}
	145
f045b8c4	146	static int slow_copyfile(const char from, const char to, struct nsinfo *nsi)
9e201442	147	{
9a17d726	148	int err = -1;
9e201442 ACM	149	char *line = NULL;
9e201442 ACM	150	size_t n;
f045b8c4 KJ	151	FILE from_fp, to_fp;
f045b8c4 KJ	152	struct nscookie nsc;
9e201442	153
f045b8c4 KJ	154	nsinfo__mountns_enter(nsi, &nsc);
	155	from_fp = fopen(from, "r");
	156	nsinfo__mountns_exit(&nsc);
9e201442 ACM	157	if (from_fp == NULL)
	158	goto out;
	159
	160	to_fp = fopen(to, "w");
	161	if (to_fp == NULL)
	162	goto out_fclose_from;
	163
	164	while (getline(&line, &n, from_fp) > 0)
	165	if (fputs(line, to_fp) == EOF)
	166	goto out_fclose_to;
	167	err = 0;
	168	out_fclose_to:
	169	fclose(to_fp);
	170	free(line);
	171	out_fclose_from:
	172	fclose(from_fp);
	173	out:
	174	return err;
	175	}
	176
9c9f5a2f NK	177	int copyfile_offset(int ifd, loff_t off_in, int ofd, loff_t off_out, u64 size)
	178	{
	179	void *ptr;
	180	loff_t pgoff;
	181
	182	pgoff = off_in & ~(page_size - 1);
	183	off_in -= pgoff;
	184
	185	ptr = mmap(NULL, off_in + size, PROT_READ, MAP_PRIVATE, ifd, pgoff);
	186	if (ptr == MAP_FAILED)
	187	return -1;
	188
	189	while (size) {
	190	ssize_t ret = pwrite(ofd, ptr + off_in, size, off_out);
	191	if (ret < 0 && errno == EINTR)
	192	continue;
	193	if (ret <= 0)
	194	break;
	195
	196	size -= ret;
	197	off_in += ret;
	198	off_out -= ret;
	199	}
	200	munmap(ptr, off_in + size);
	201
	202	return size ? -1 : 0;
	203	}
	204
f045b8c4 KJ	205	static int copyfile_mode_ns(const char from, const char to, mode_t mode,
f045b8c4 KJ	206	struct nsinfo *nsi)
4cf40131 ACM	207	{
	208	int fromfd, tofd;
	209	struct stat st;
f045b8c4	210	int err;
d7c72606	211	char tmp = NULL, ptr = NULL;
f045b8c4	212	struct nscookie nsc;
4cf40131	213
f045b8c4 KJ	214	nsinfo__mountns_enter(nsi, &nsc);
	215	err = stat(from, &st);
	216	nsinfo__mountns_exit(&nsc);
	217	if (err)
4cf40131	218	goto out;
f045b8c4	219	err = -1;
4cf40131	220
d7c72606 MV	221	/* extra 'x' at the end is to reserve space for '.' */
	222	if (asprintf(&tmp, "%s.XXXXXXx", to) < 0) {
	223	tmp = NULL;
4cf40131	224	goto out;
d7c72606 MV	225	}
	226	ptr = strrchr(tmp, '/');
	227	if (!ptr)
	228	goto out;
	229	ptr = memmove(ptr + 1, ptr, strlen(ptr) - 1);
	230	*ptr = '.';
4cf40131	231
d7c72606	232	tofd = mkstemp(tmp);
4cf40131	233	if (tofd < 0)
d7c72606 MV	234	goto out;
	235
	236	if (fchmod(tofd, mode))
	237	goto out_close_to;
	238
	239	if (st.st_size == 0) { /* /proc? do it slowly... */
f045b8c4	240	err = slow_copyfile(from, tmp, nsi);
d7c72606 MV	241	goto out_close_to;
	242	}
	243
f045b8c4	244	nsinfo__mountns_enter(nsi, &nsc);
d7c72606	245	fromfd = open(from, O_RDONLY);
f045b8c4	246	nsinfo__mountns_exit(&nsc);
d7c72606 MV	247	if (fromfd < 0)
d7c72606 MV	248	goto out_close_to;
4cf40131	249
9c9f5a2f	250	err = copyfile_offset(fromfd, 0, tofd, 0, st.st_size);
4cf40131	251
4cf40131	252	close(fromfd);
d7c72606 MV	253	out_close_to:
	254	close(tofd);
	255	if (!err)
	256	err = link(tmp, to);
	257	unlink(tmp);
4cf40131	258	out:
d7c72606	259	free(tmp);
4cf40131 ACM	260	return err;
4cf40131 ACM	261	}
c82ee828	262
f045b8c4 KJ	263	int copyfile_ns(const char from, const char to, struct nsinfo *nsi)
	264	{
	265	return copyfile_mode_ns(from, to, 0755, nsi);
	266	}
	267
	268	int copyfile_mode(const char from, const char to, mode_t mode)
	269	{
	270	return copyfile_mode_ns(from, to, mode, NULL);
	271	}
	272
9a17d726 AH	273	int copyfile(const char from, const char to)
	274	{
	275	return copyfile_mode(from, to, 0755);
	276	}
	277
bc3a502b	278	static ssize_t ion(bool is_read, int fd, void *buf, size_t n)
1e7972cc ACM	279	{
1e7972cc ACM	280	void *buf_start = buf;
838d1452	281	size_t left = n;
1e7972cc	282
838d1452	283	while (left) {
bc3a502b JO	284	ssize_t ret = is_read ? read(fd, buf, left) :
bc3a502b JO	285	write(fd, buf, left);
1e7972cc	286
e148c760 NK	287	if (ret < 0 && errno == EINTR)
e148c760 NK	288	continue;
1e7972cc ACM	289	if (ret <= 0)
	290	return ret;
	291
838d1452 JO	292	left -= ret;
838d1452 JO	293	buf += ret;
1e7972cc ACM	294	}
1e7972cc ACM	295
838d1452 JO	296	BUG_ON((size_t)(buf - buf_start) != n);
838d1452 JO	297	return n;
1e7972cc	298	}
61e04b33	299
bc3a502b JO	300	/*
	301	* Read exactly 'n' bytes or return an error.
	302	*/
	303	ssize_t readn(int fd, void *buf, size_t n)
	304	{
	305	return ion(true, fd, buf, n);
	306	}
	307
	308	/*
	309	* Write exactly 'n' bytes or return an error.
	310	*/
	311	ssize_t writen(int fd, void *buf, size_t n)
	312	{
	313	return ion(false, fd, buf, n);
	314	}
	315
61e04b33 ACM	316	size_t hex_width(u64 v)
	317	{
	318	size_t n = 1;
	319
	320	while ((v >>= 4))
	321	++n;
	322
	323	return n;
	324	}
dc4552bf	325
b2aff5f6 JO	326	static int hex(char ch)
	327	{
	328	if ((ch >= '0') && (ch <= '9'))
	329	return ch - '0';
	330	if ((ch >= 'a') && (ch <= 'f'))
	331	return ch - 'a' + 10;
	332	if ((ch >= 'A') && (ch <= 'F'))
	333	return ch - 'A' + 10;
	334	return -1;
	335	}
	336
	337	/*
	338	* While we find nice hex chars, build a long_val.
	339	* Return number of chars processed.
	340	*/
	341	int hex2u64(const char ptr, u64 long_val)
	342	{
	343	const char *p = ptr;
	344	*long_val = 0;
	345
	346	while (*p) {
	347	const int hex_val = hex(*p);
	348
	349	if (hex_val < 0)
	350	break;
	351
	352	long_val = (long_val << 4) \| hex_val;
	353	p++;
	354	}
	355
	356	return p - ptr;
	357	}
	358
1a47245d AH	359	int perf_event_paranoid(void)
1a47245d AH	360	{
1a47245d AH	361	int value;
1a47245d AH	362
ce27309f	363	if (sysctl__read_int("kernel/perf_event_paranoid", &value))
1a47245d AH	364	return INT_MAX;
	365
	366	return value;
	367	}
d18acd15 WN	368	static int
	369	fetch_ubuntu_kernel_version(unsigned int *puint)
	370	{
	371	ssize_t len;
	372	size_t line_len = 0;
	373	char ptr, line = NULL;
	374	int version, patchlevel, sublevel, err;
44b58e06	375	FILE *vsig;
d18acd15	376
44b58e06 ACM	377	if (!puint)
	378	return 0;
	379
	380	vsig = fopen("/proc/version_signature", "r");
d18acd15 WN	381	if (!vsig) {
	382	pr_debug("Open /proc/version_signature failed: %s\n",
	383	strerror(errno));
	384	return -1;
	385	}
	386
	387	len = getline(&line, &line_len, vsig);
	388	fclose(vsig);
	389	err = -1;
	390	if (len <= 0) {
	391	pr_debug("Reading from /proc/version_signature failed: %s\n",
	392	strerror(errno));
	393	goto errout;
	394	}
	395
	396	ptr = strrchr(line, ' ');
	397	if (!ptr) {
	398	pr_debug("Parsing /proc/version_signature failed: %s\n", line);
	399	goto errout;
	400	}
	401
	402	err = sscanf(ptr + 1, "%d.%d.%d",
	403	&version, &patchlevel, &sublevel);
	404	if (err != 3) {
	405	pr_debug("Unable to get kernel version from /proc/version_signature '%s'\n",
	406	line);
	407	goto errout;
	408	}
	409
44b58e06	410	*puint = (version << 16) + (patchlevel << 8) + sublevel;
d18acd15 WN	411	err = 0;
	412	errout:
	413	free(line);
	414	return err;
	415	}
	416
07bc5c69 WN	417	int
	418	fetch_kernel_version(unsigned int puint, char str,
	419	size_t str_size)
	420	{
	421	struct utsname utsname;
	422	int version, patchlevel, sublevel, err;
d18acd15 WN	423	bool int_ver_ready = false;
	424
	425	if (access("/proc/version_signature", R_OK) == 0)
	426	if (!fetch_ubuntu_kernel_version(puint))
	427	int_ver_ready = true;
07bc5c69 WN	428
	429	if (uname(&utsname))
	430	return -1;
	431
	432	if (str && str_size) {
	433	strncpy(str, utsname.release, str_size);
	434	str[str_size - 1] = '\0';
	435	}
	436
44b58e06 ACM	437	if (!puint \|\| int_ver_ready)
	438	return 0;
	439
07bc5c69 WN	440	err = sscanf(utsname.release, "%d.%d.%d",
	441	&version, &patchlevel, &sublevel);
	442
	443	if (err != 3) {
d18acd15	444	pr_debug("Unable to get kernel version from uname '%s'\n",
07bc5c69 WN	445	utsname.release);
	446	return -1;
	447	}
	448
44b58e06	449	*puint = (version << 16) + (patchlevel << 8) + sublevel;
07bc5c69 WN	450	return 0;
07bc5c69 WN	451	}
14cbfbeb NK	452
	453	const char perf_tip(const char dirpath)
	454	{
	455	struct strlist *tips;
	456	struct str_node *node;
	457	char *tip = NULL;
	458	struct strlist_config conf = {
34b7b0f9 NK	459	.dirname = dirpath,
34b7b0f9 NK	460	.file_only = true,
14cbfbeb NK	461	};
	462
	463	tips = strlist__new("tips.txt", &conf);
34b7b0f9	464	if (tips == NULL)
570eda03 DCC	465	return errno == ENOENT ? NULL :
570eda03 DCC	466	"Tip: check path of tips.txt or get more memory! ;-p";
34b7b0f9 NK	467
34b7b0f9 NK	468	if (strlist__nr_entries(tips) == 0)
14cbfbeb	469	goto out;
14cbfbeb NK	470
	471	node = strlist__entry(tips, random() % strlist__nr_entries(tips));
	472	if (asprintf(&tip, "Tip: %s", node->s) < 0)
	473	tip = (char *)"Tip: get more memory! ;-)";
	474
	475	out:
	476	strlist__delete(tips);
	477
	478	return tip;
	479	}