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TOMOYO Linux Cross Reference
Linux/tools/perf/util/data.c

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  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"
 10 
 11 static bool check_pipe(struct perf_data_file *file)
 12 {
 13         struct stat st;
 14         bool is_pipe = false;
 15         int fd = perf_data_file__is_read(file) ?
 16                  STDIN_FILENO : STDOUT_FILENO;
 17 
 18         if (!file->path) {
 19                 if (!fstat(fd, &st) && S_ISFIFO(st.st_mode))
 20                         is_pipe = true;
 21         } else {
 22                 if (!strcmp(file->path, "-"))
 23                         is_pipe = true;
 24         }
 25 
 26         if (is_pipe)
 27                 file->fd = fd;
 28 
 29         return file->is_pipe = is_pipe;
 30 }
 31 
 32 static int check_backup(struct perf_data_file *file)
 33 {
 34         struct stat st;
 35 
 36         if (!stat(file->path, &st) && st.st_size) {
 37                 /* TODO check errors properly */
 38                 char oldname[PATH_MAX];
 39                 snprintf(oldname, sizeof(oldname), "%s.old",
 40                          file->path);
 41                 unlink(oldname);
 42                 rename(file->path, oldname);
 43         }
 44 
 45         return 0;
 46 }
 47 
 48 static int open_file_read(struct perf_data_file *file)
 49 {
 50         struct stat st;
 51         int fd;
 52 
 53         fd = open(file->path, O_RDONLY);
 54         if (fd < 0) {
 55                 int err = errno;
 56 
 57                 pr_err("failed to open %s: %s", file->path, strerror(err));
 58                 if (err == ENOENT && !strcmp(file->path, "perf.data"))
 59                         pr_err("  (try 'perf record' first)");
 60                 pr_err("\n");
 61                 return -err;
 62         }
 63 
 64         if (fstat(fd, &st) < 0)
 65                 goto out_close;
 66 
 67         if (!file->force && st.st_uid && (st.st_uid != geteuid())) {
 68                 pr_err("file %s not owned by current user or root\n",
 69                        file->path);
 70                 goto out_close;
 71         }
 72 
 73         if (!st.st_size) {
 74                 pr_info("zero-sized file (%s), nothing to do!\n",
 75                         file->path);
 76                 goto out_close;
 77         }
 78 
 79         file->size = st.st_size;
 80         return fd;
 81 
 82  out_close:
 83         close(fd);
 84         return -1;
 85 }
 86 
 87 static int open_file_write(struct perf_data_file *file)
 88 {
 89         if (check_backup(file))
 90                 return -1;
 91 
 92         return open(file->path, O_CREAT|O_RDWR|O_TRUNC, S_IRUSR|S_IWUSR);
 93 }
 94 
 95 static int open_file(struct perf_data_file *file)
 96 {
 97         int fd;
 98 
 99         fd = perf_data_file__is_read(file) ?
100              open_file_read(file) : open_file_write(file);
101 
102         file->fd = fd;
103         return fd < 0 ? -1 : 0;
104 }
105 
106 int perf_data_file__open(struct perf_data_file *file)
107 {
108         if (check_pipe(file))
109                 return 0;
110 
111         if (!file->path)
112                 file->path = "perf.data";
113 
114         return open_file(file);
115 }
116 
117 void perf_data_file__close(struct perf_data_file *file)
118 {
119         close(file->fd);
120 }
121 
122 ssize_t perf_data_file__write(struct perf_data_file *file,
123                               void *buf, size_t size)
124 {
125         return writen(file->fd, buf, size);
126 }
127 

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