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94c744b6 ACM |
1 | #include <linux/kernel.h> |
2 | ||
3 | #include <unistd.h> | |
4 | #include <sys/types.h> | |
5 | ||
6 | #include "session.h" | |
7 | #include "util.h" | |
8 | ||
9 | static int perf_session__open(struct perf_session *self, bool force) | |
10 | { | |
11 | struct stat input_stat; | |
12 | ||
13 | self->fd = open(self->filename, O_RDONLY); | |
14 | if (self->fd < 0) { | |
15 | pr_err("failed to open file: %s", self->filename); | |
16 | if (!strcmp(self->filename, "perf.data")) | |
17 | pr_err(" (try 'perf record' first)"); | |
18 | pr_err("\n"); | |
19 | return -errno; | |
20 | } | |
21 | ||
22 | if (fstat(self->fd, &input_stat) < 0) | |
23 | goto out_close; | |
24 | ||
25 | if (!force && input_stat.st_uid && (input_stat.st_uid != geteuid())) { | |
26 | pr_err("file %s not owned by current user or root\n", | |
27 | self->filename); | |
28 | goto out_close; | |
29 | } | |
30 | ||
31 | if (!input_stat.st_size) { | |
32 | pr_info("zero-sized file (%s), nothing to do!\n", | |
33 | self->filename); | |
34 | goto out_close; | |
35 | } | |
36 | ||
37 | if (perf_header__read(&self->header, self->fd) < 0) { | |
38 | pr_err("incompatible file format"); | |
39 | goto out_close; | |
40 | } | |
41 | ||
42 | self->size = input_stat.st_size; | |
43 | return 0; | |
44 | ||
45 | out_close: | |
46 | close(self->fd); | |
47 | self->fd = -1; | |
48 | return -1; | |
49 | } | |
50 | ||
301a0b02 ACM |
51 | struct perf_session *perf_session__new(const char *filename, int mode, |
52 | bool force) | |
94c744b6 ACM |
53 | { |
54 | size_t len = strlen(filename) + 1; | |
55 | struct perf_session *self = zalloc(sizeof(*self) + len); | |
56 | ||
57 | if (self == NULL) | |
58 | goto out; | |
59 | ||
60 | if (perf_header__init(&self->header) < 0) | |
61 | goto out_delete; | |
62 | ||
63 | memcpy(self->filename, filename, len); | |
ec913369 ACM |
64 | self->mmap_window = 32; |
65 | self->cwd = NULL; | |
66 | self->cwdlen = 0; | |
94c744b6 ACM |
67 | |
68 | if (mode == O_RDONLY && perf_session__open(self, force) < 0) { | |
69 | perf_session__delete(self); | |
70 | self = NULL; | |
71 | } | |
72 | out: | |
73 | return self; | |
74 | out_delete: | |
75 | free(self); | |
76 | return NULL; | |
77 | } | |
78 | ||
79 | void perf_session__delete(struct perf_session *self) | |
80 | { | |
81 | perf_header__exit(&self->header); | |
82 | close(self->fd); | |
ec913369 | 83 | free(self->cwd); |
94c744b6 ACM |
84 | free(self); |
85 | } |