1 #include <linux/compiler.h>
2 #include <linux/kernel.h>
12 static bool check_pipe(struct perf_data_file *file)
16 int fd = perf_data_file__is_read(file) ?
17 STDIN_FILENO : STDOUT_FILENO;
20 if (!fstat(fd, &st) && S_ISFIFO(st.st_mode))
23 if (!strcmp(file->path, "-"))
30 return file->is_pipe = is_pipe;
33 static int check_backup(struct perf_data_file *file)
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",
43 rename(file->path, oldname);
49 static int open_file_read(struct perf_data_file *file)
53 char sbuf[STRERR_BUFSIZE];
55 fd = open(file->path, O_RDONLY);
59 pr_err("failed to open %s: %s", file->path,
60 strerror_r(err, sbuf, sizeof(sbuf)));
61 if (err == ENOENT && !strcmp(file->path, "perf.data"))
62 pr_err(" (try 'perf record' first)");
67 if (fstat(fd, &st) < 0)
70 if (!file->force && st.st_uid && (st.st_uid != geteuid())) {
71 pr_err("File %s not owned by current user or root (use -f to override)\n",
77 pr_info("zero-sized file (%s), nothing to do!\n",
82 file->size = st.st_size;
90 static int open_file_write(struct perf_data_file *file)
93 char sbuf[STRERR_BUFSIZE];
95 if (check_backup(file))
98 fd = open(file->path, O_CREAT|O_RDWR|O_TRUNC, S_IRUSR|S_IWUSR);
101 pr_err("failed to open %s : %s\n", file->path,
102 strerror_r(errno, sbuf, sizeof(sbuf)));
107 static int open_file(struct perf_data_file *file)
111 fd = perf_data_file__is_read(file) ?
112 open_file_read(file) : open_file_write(file);
115 return fd < 0 ? -1 : 0;
118 int perf_data_file__open(struct perf_data_file *file)
120 if (check_pipe(file))
124 file->path = "perf.data";
126 return open_file(file);
129 void perf_data_file__close(struct perf_data_file *file)
134 ssize_t perf_data_file__write(struct perf_data_file *file,
135 void *buf, size_t size)
137 return writen(file->fd, buf, size);