aboutsummaryrefslogtreecommitdiffstats
path: root/tools/perf/util/util.c
blob: 99664598bc1acfa3d03e0aaa1b0a44834be5f2d8 (plain) (blame)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
#include "../perf.h"
#include "util.h"
#include <sys/mman.h>
#ifdef BACKTRACE_SUPPORT
#include <execinfo.h>
#endif
#include <stdio.h>
#include <stdlib.h>

/*
 * XXX We need to find a better place for these things...
 */
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;
}

static int slow_copyfile(const char *from, const char *to)
{
	int err = 0;
	char *line = NULL;
	size_t n;
	FILE *from_fp = fopen(from, "r"), *to_fp;

	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(const char *from, const char *to)
{
	int fromfd, tofd;
	struct stat st;
	void *addr;
	int err = -1;

	if (stat(from, &st))
		goto out;

	if (st.st_size == 0) /* /proc? do it slowly... */
		return slow_copyfile(from, to);

	fromfd = open(from, O_RDONLY);
	if (fromfd < 0)
		goto out;

	tofd = creat(to, 0755);
	if (tofd < 0)
		goto out_close_from;

	addr = mmap(NULL, st.st_size, PROT_READ, MAP_PRIVATE, fromfd, 0);
	if (addr == MAP_FAILED)
		goto out_close_to;

	if (write(tofd, addr, st.st_size) == st.st_size)
		err = 0;

	munmap(addr, st.st_size);
out_close_to:
	close(tofd);
	if (err)
		unlink(to);
out_close_from:
	close(fromfd);
out:
	return err;
}

unsigned long convert_unit(unsigned long value, char *unit)
{
	*unit = ' ';

	if (value > 1000) {
		value /= 1000;
		*unit = 'K';
	}

	if (value > 1000) {
		value /= 1000;
		*unit = 'M';
	}

	if (value > 1000) {
		value /= 1000;
		*unit = 'G';
	}

	return value;
}

int readn(int fd, void *buf, size_t n)
{
	void *buf_start = buf;

	while (n) {
		int ret = read(fd, buf, n);

		if (ret <= 0)
			return ret;

		n -= ret;
		buf += ret;
	}

	return buf - buf_start;
}

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

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

	return n;
}

/* Obtain a backtrace and print it to stdout. */
#ifdef BACKTRACE_SUPPORT
void dump_stack(void)
{
	void *array[16];
	size_t size = backtrace(array, ARRAY_SIZE(array));
	char **strings = backtrace_symbols(array, size);
	size_t i;

	printf("Obtained %zd stack frames.\n", size);

	for (i = 0; i < size; i++)
		printf("%s\n", strings[i]);

	free(strings);
}
#else
void dump_stack(void) {}
#endif