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7c6a1c65 PZ |
1 | #include <sys/types.h> |
2 | #include <unistd.h> | |
3 | #include <stdio.h> | |
4 | #include <stdlib.h> | |
5 | ||
6 | #include "util.h" | |
7 | #include "header.h" | |
8 | ||
9 | /* | |
10 | * | |
11 | */ | |
12 | ||
13 | struct perf_header_attr *perf_header_attr__new(struct perf_counter_attr *attr) | |
14 | { | |
15 | struct perf_header_attr *self = malloc(sizeof(*self)); | |
16 | ||
17 | if (!self) | |
18 | die("nomem"); | |
19 | ||
20 | self->attr = *attr; | |
21 | self->ids = 0; | |
22 | self->size = 1; | |
23 | self->id = malloc(sizeof(u64)); | |
24 | ||
25 | if (!self->id) | |
26 | die("nomem"); | |
27 | ||
28 | return self; | |
29 | } | |
30 | ||
31 | void perf_header_attr__add_id(struct perf_header_attr *self, u64 id) | |
32 | { | |
33 | int pos = self->ids; | |
34 | ||
35 | self->ids++; | |
36 | if (self->ids > self->size) { | |
37 | self->size *= 2; | |
38 | self->id = realloc(self->id, self->size * sizeof(u64)); | |
39 | if (!self->id) | |
40 | die("nomem"); | |
41 | } | |
42 | self->id[pos] = id; | |
43 | } | |
44 | ||
45 | /* | |
46 | * | |
47 | */ | |
48 | ||
49 | struct perf_header *perf_header__new(void) | |
50 | { | |
51 | struct perf_header *self = malloc(sizeof(*self)); | |
52 | ||
53 | if (!self) | |
54 | die("nomem"); | |
55 | ||
56 | self->frozen = 0; | |
57 | ||
58 | self->attrs = 0; | |
59 | self->size = 1; | |
60 | self->attr = malloc(sizeof(void *)); | |
61 | ||
62 | if (!self->attr) | |
63 | die("nomem"); | |
64 | ||
65 | self->data_offset = 0; | |
66 | self->data_size = 0; | |
67 | ||
68 | return self; | |
69 | } | |
70 | ||
71 | void perf_header__add_attr(struct perf_header *self, | |
72 | struct perf_header_attr *attr) | |
73 | { | |
74 | int pos = self->attrs; | |
75 | ||
76 | if (self->frozen) | |
77 | die("frozen"); | |
78 | ||
79 | self->attrs++; | |
80 | if (self->attrs > self->size) { | |
81 | self->size *= 2; | |
82 | self->attr = realloc(self->attr, self->size * sizeof(void *)); | |
83 | if (!self->attr) | |
84 | die("nomem"); | |
85 | } | |
86 | self->attr[pos] = attr; | |
87 | } | |
88 | ||
89 | static const char *__perf_magic = "PERFFILE"; | |
90 | ||
91 | #define PERF_MAGIC (*(u64 *)__perf_magic) | |
92 | ||
93 | struct perf_file_section { | |
94 | u64 offset; | |
95 | u64 size; | |
96 | }; | |
97 | ||
98 | struct perf_file_attr { | |
99 | struct perf_counter_attr attr; | |
100 | struct perf_file_section ids; | |
101 | }; | |
102 | ||
103 | struct perf_file_header { | |
104 | u64 magic; | |
105 | u64 size; | |
106 | u64 attr_size; | |
107 | struct perf_file_section attrs; | |
108 | struct perf_file_section data; | |
109 | }; | |
110 | ||
111 | static void do_write(int fd, void *buf, size_t size) | |
112 | { | |
113 | while (size) { | |
114 | int ret = write(fd, buf, size); | |
115 | ||
116 | if (ret < 0) | |
117 | die("failed to write"); | |
118 | ||
119 | size -= ret; | |
120 | buf += ret; | |
121 | } | |
122 | } | |
123 | ||
124 | void perf_header__write(struct perf_header *self, int fd) | |
125 | { | |
126 | struct perf_file_header f_header; | |
127 | struct perf_file_attr f_attr; | |
128 | struct perf_header_attr *attr; | |
129 | int i; | |
130 | ||
131 | lseek(fd, sizeof(f_header), SEEK_SET); | |
132 | ||
133 | ||
134 | for (i = 0; i < self->attrs; i++) { | |
135 | attr = self->attr[i]; | |
136 | ||
137 | attr->id_offset = lseek(fd, 0, SEEK_CUR); | |
138 | do_write(fd, attr->id, attr->ids * sizeof(u64)); | |
139 | } | |
140 | ||
141 | ||
142 | self->attr_offset = lseek(fd, 0, SEEK_CUR); | |
143 | ||
144 | for (i = 0; i < self->attrs; i++) { | |
145 | attr = self->attr[i]; | |
146 | ||
147 | f_attr = (struct perf_file_attr){ | |
148 | .attr = attr->attr, | |
149 | .ids = { | |
150 | .offset = attr->id_offset, | |
151 | .size = attr->ids * sizeof(u64), | |
152 | } | |
153 | }; | |
154 | do_write(fd, &f_attr, sizeof(f_attr)); | |
155 | } | |
156 | ||
157 | ||
158 | self->data_offset = lseek(fd, 0, SEEK_CUR); | |
159 | ||
160 | f_header = (struct perf_file_header){ | |
161 | .magic = PERF_MAGIC, | |
162 | .size = sizeof(f_header), | |
163 | .attr_size = sizeof(f_attr), | |
164 | .attrs = { | |
165 | .offset = self->attr_offset, | |
166 | .size = self->attrs * sizeof(f_attr), | |
167 | }, | |
168 | .data = { | |
169 | .offset = self->data_offset, | |
170 | .size = self->data_size, | |
171 | }, | |
172 | }; | |
173 | ||
174 | lseek(fd, 0, SEEK_SET); | |
175 | do_write(fd, &f_header, sizeof(f_header)); | |
176 | lseek(fd, self->data_offset + self->data_size, SEEK_SET); | |
177 | ||
178 | self->frozen = 1; | |
179 | } | |
180 | ||
181 | static void do_read(int fd, void *buf, size_t size) | |
182 | { | |
183 | while (size) { | |
184 | int ret = read(fd, buf, size); | |
185 | ||
186 | if (ret < 0) | |
187 | die("failed to read"); | |
188 | ||
189 | size -= ret; | |
190 | buf += ret; | |
191 | } | |
192 | } | |
193 | ||
194 | struct perf_header *perf_header__read(int fd) | |
195 | { | |
196 | struct perf_header *self = perf_header__new(); | |
197 | struct perf_file_header f_header; | |
198 | struct perf_file_attr f_attr; | |
199 | u64 f_id; | |
200 | ||
201 | int nr_attrs, nr_ids, i, j; | |
202 | ||
203 | lseek(fd, 0, SEEK_SET); | |
204 | do_read(fd, &f_header, sizeof(f_header)); | |
205 | ||
206 | if (f_header.magic != PERF_MAGIC || | |
207 | f_header.size != sizeof(f_header) || | |
208 | f_header.attr_size != sizeof(f_attr)) | |
209 | die("incompatible file format"); | |
210 | ||
211 | nr_attrs = f_header.attrs.size / sizeof(f_attr); | |
212 | lseek(fd, f_header.attrs.offset, SEEK_SET); | |
213 | ||
214 | for (i = 0; i < nr_attrs; i++) { | |
215 | struct perf_header_attr *attr; | |
1c222bce | 216 | off_t tmp; |
7c6a1c65 PZ |
217 | |
218 | do_read(fd, &f_attr, sizeof(f_attr)); | |
1c222bce | 219 | tmp = lseek(fd, 0, SEEK_CUR); |
7c6a1c65 PZ |
220 | |
221 | attr = perf_header_attr__new(&f_attr.attr); | |
222 | ||
223 | nr_ids = f_attr.ids.size / sizeof(u64); | |
224 | lseek(fd, f_attr.ids.offset, SEEK_SET); | |
225 | ||
226 | for (j = 0; j < nr_ids; j++) { | |
227 | do_read(fd, &f_id, sizeof(f_id)); | |
228 | ||
229 | perf_header_attr__add_id(attr, f_id); | |
230 | } | |
231 | perf_header__add_attr(self, attr); | |
232 | lseek(fd, tmp, SEEK_SET); | |
233 | } | |
234 | ||
235 | self->data_offset = f_header.data.offset; | |
236 | self->data_size = f_header.data.size; | |
237 | ||
238 | lseek(fd, self->data_offset + self->data_size, SEEK_SET); | |
239 | ||
240 | self->frozen = 1; | |
241 | ||
242 | return self; | |
243 | } |