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Commit | Line | Data |
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6a4d98d7 JO |
1 | #include <linux/compiler.h> |
2 | #include <linux/kernel.h> | |
3 | #include <sys/types.h> | |
4 | #include <sys/stat.h> | |
5 | #include <unistd.h> | |
6 | #include <string.h> | |
7 | ||
8 | #include "data.h" | |
9 | #include "util.h" | |
84f5d36f | 10 | #include "debug.h" |
6a4d98d7 JO |
11 | |
12 | static bool check_pipe(struct perf_data_file *file) | |
13 | { | |
14 | struct stat st; | |
15 | bool is_pipe = false; | |
16 | int fd = perf_data_file__is_read(file) ? | |
17 | STDIN_FILENO : STDOUT_FILENO; | |
18 | ||
19 | if (!file->path) { | |
20 | if (!fstat(fd, &st) && S_ISFIFO(st.st_mode)) | |
21 | is_pipe = true; | |
22 | } else { | |
23 | if (!strcmp(file->path, "-")) | |
24 | is_pipe = true; | |
25 | } | |
26 | ||
27 | if (is_pipe) | |
28 | file->fd = fd; | |
29 | ||
30 | return file->is_pipe = is_pipe; | |
31 | } | |
32 | ||
33 | static int check_backup(struct perf_data_file *file) | |
34 | { | |
35 | struct stat st; | |
36 | ||
37 | if (!stat(file->path, &st) && st.st_size) { | |
38 | /* TODO check errors properly */ | |
39 | char oldname[PATH_MAX]; | |
40 | snprintf(oldname, sizeof(oldname), "%s.old", | |
41 | file->path); | |
42 | unlink(oldname); | |
43 | rename(file->path, oldname); | |
44 | } | |
45 | ||
46 | return 0; | |
47 | } | |
48 | ||
49 | static int open_file_read(struct perf_data_file *file) | |
50 | { | |
51 | struct stat st; | |
52 | int fd; | |
6e81c74c | 53 | char sbuf[STRERR_BUFSIZE]; |
6a4d98d7 JO |
54 | |
55 | fd = open(file->path, O_RDONLY); | |
56 | if (fd < 0) { | |
57 | int err = errno; | |
58 | ||
6e81c74c | 59 | pr_err("failed to open %s: %s", file->path, |
c8b5f2c9 | 60 | str_error_r(err, sbuf, sizeof(sbuf))); |
6a4d98d7 JO |
61 | if (err == ENOENT && !strcmp(file->path, "perf.data")) |
62 | pr_err(" (try 'perf record' first)"); | |
63 | pr_err("\n"); | |
64 | return -err; | |
65 | } | |
66 | ||
67 | if (fstat(fd, &st) < 0) | |
68 | goto out_close; | |
69 | ||
70 | if (!file->force && st.st_uid && (st.st_uid != geteuid())) { | |
071266bf | 71 | pr_err("File %s not owned by current user or root (use -f to override)\n", |
6a4d98d7 JO |
72 | file->path); |
73 | goto out_close; | |
74 | } | |
75 | ||
76 | if (!st.st_size) { | |
77 | pr_info("zero-sized file (%s), nothing to do!\n", | |
78 | file->path); | |
79 | goto out_close; | |
80 | } | |
81 | ||
82 | file->size = st.st_size; | |
83 | return fd; | |
84 | ||
85 | out_close: | |
86 | close(fd); | |
87 | return -1; | |
88 | } | |
89 | ||
90 | static int open_file_write(struct perf_data_file *file) | |
91 | { | |
ffa91880 | 92 | int fd; |
6e81c74c | 93 | char sbuf[STRERR_BUFSIZE]; |
ffa91880 | 94 | |
6a4d98d7 JO |
95 | if (check_backup(file)) |
96 | return -1; | |
97 | ||
ffa91880 AB |
98 | fd = open(file->path, O_CREAT|O_RDWR|O_TRUNC, S_IRUSR|S_IWUSR); |
99 | ||
100 | if (fd < 0) | |
6e81c74c | 101 | pr_err("failed to open %s : %s\n", file->path, |
c8b5f2c9 | 102 | str_error_r(errno, sbuf, sizeof(sbuf))); |
ffa91880 AB |
103 | |
104 | return fd; | |
6a4d98d7 JO |
105 | } |
106 | ||
107 | static int open_file(struct perf_data_file *file) | |
108 | { | |
109 | int fd; | |
110 | ||
111 | fd = perf_data_file__is_read(file) ? | |
112 | open_file_read(file) : open_file_write(file); | |
113 | ||
114 | file->fd = fd; | |
115 | return fd < 0 ? -1 : 0; | |
116 | } | |
117 | ||
118 | int perf_data_file__open(struct perf_data_file *file) | |
119 | { | |
120 | if (check_pipe(file)) | |
121 | return 0; | |
122 | ||
123 | if (!file->path) | |
124 | file->path = "perf.data"; | |
125 | ||
126 | return open_file(file); | |
127 | } | |
128 | ||
129 | void perf_data_file__close(struct perf_data_file *file) | |
130 | { | |
131 | close(file->fd); | |
132 | } | |
6f9a317f JO |
133 | |
134 | ssize_t perf_data_file__write(struct perf_data_file *file, | |
135 | void *buf, size_t size) | |
136 | { | |
137 | return writen(file->fd, buf, size); | |
138 | } | |
040f9915 WN |
139 | |
140 | int perf_data_file__switch(struct perf_data_file *file, | |
141 | const char *postfix, | |
142 | size_t pos, bool at_exit) | |
143 | { | |
144 | char *new_filepath; | |
145 | int ret; | |
146 | ||
147 | if (check_pipe(file)) | |
148 | return -EINVAL; | |
149 | if (perf_data_file__is_read(file)) | |
150 | return -EINVAL; | |
151 | ||
152 | if (asprintf(&new_filepath, "%s.%s", file->path, postfix) < 0) | |
153 | return -ENOMEM; | |
154 | ||
155 | /* | |
156 | * Only fire a warning, don't return error, continue fill | |
157 | * original file. | |
158 | */ | |
159 | if (rename(file->path, new_filepath)) | |
160 | pr_warning("Failed to rename %s to %s\n", file->path, new_filepath); | |
161 | ||
162 | if (!at_exit) { | |
163 | close(file->fd); | |
164 | ret = perf_data_file__open(file); | |
165 | if (ret < 0) | |
166 | goto out; | |
167 | ||
168 | if (lseek(file->fd, pos, SEEK_SET) == (off_t)-1) { | |
169 | ret = -errno; | |
170 | pr_debug("Failed to lseek to %zu: %s", | |
171 | pos, strerror(errno)); | |
172 | goto out; | |
173 | } | |
174 | } | |
175 | ret = file->fd; | |
176 | out: | |
177 | free(new_filepath); | |
178 | return ret; | |
179 | } |