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Linux/tools/perf/util/data.c

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  1 // SPDX-License-Identifier: GPL-2.0
  2 #include <linux/compiler.h>
  3 #include <linux/kernel.h>
  4 #include <sys/types.h>
  5 #include <sys/stat.h>
  6 #include <errno.h>
  7 #include <fcntl.h>
  8 #include <unistd.h>
  9 #include <string.h>
 10 
 11 #include "data.h"
 12 #include "util.h"
 13 #include "debug.h"
 14 
 15 static bool check_pipe(struct perf_data *data)
 16 {
 17         struct stat st;
 18         bool is_pipe = false;
 19         int fd = perf_data__is_read(data) ?
 20                  STDIN_FILENO : STDOUT_FILENO;
 21 
 22         if (!data->file.path) {
 23                 if (!fstat(fd, &st) && S_ISFIFO(st.st_mode))
 24                         is_pipe = true;
 25         } else {
 26                 if (!strcmp(data->file.path, "-"))
 27                         is_pipe = true;
 28         }
 29 
 30         if (is_pipe)
 31                 data->file.fd = fd;
 32 
 33         return data->is_pipe = is_pipe;
 34 }
 35 
 36 static int check_backup(struct perf_data *data)
 37 {
 38         struct stat st;
 39 
 40         if (!stat(data->file.path, &st) && st.st_size) {
 41                 /* TODO check errors properly */
 42                 char oldname[PATH_MAX];
 43                 snprintf(oldname, sizeof(oldname), "%s.old",
 44                          data->file.path);
 45                 unlink(oldname);
 46                 rename(data->file.path, oldname);
 47         }
 48 
 49         return 0;
 50 }
 51 
 52 static int open_file_read(struct perf_data *data)
 53 {
 54         struct stat st;
 55         int fd;
 56         char sbuf[STRERR_BUFSIZE];
 57 
 58         fd = open(data->file.path, O_RDONLY);
 59         if (fd < 0) {
 60                 int err = errno;
 61 
 62                 pr_err("failed to open %s: %s", data->file.path,
 63                         str_error_r(err, sbuf, sizeof(sbuf)));
 64                 if (err == ENOENT && !strcmp(data->file.path, "perf.data"))
 65                         pr_err("  (try 'perf record' first)");
 66                 pr_err("\n");
 67                 return -err;
 68         }
 69 
 70         if (fstat(fd, &st) < 0)
 71                 goto out_close;
 72 
 73         if (!data->force && st.st_uid && (st.st_uid != geteuid())) {
 74                 pr_err("File %s not owned by current user or root (use -f to override)\n",
 75                        data->file.path);
 76                 goto out_close;
 77         }
 78 
 79         if (!st.st_size) {
 80                 pr_info("zero-sized data (%s), nothing to do!\n",
 81                         data->file.path);
 82                 goto out_close;
 83         }
 84 
 85         data->size = st.st_size;
 86         return fd;
 87 
 88  out_close:
 89         close(fd);
 90         return -1;
 91 }
 92 
 93 static int open_file_write(struct perf_data *data)
 94 {
 95         int fd;
 96         char sbuf[STRERR_BUFSIZE];
 97 
 98         if (check_backup(data))
 99                 return -1;
100 
101         fd = open(data->file.path, O_CREAT|O_RDWR|O_TRUNC|O_CLOEXEC,
102                   S_IRUSR|S_IWUSR);
103 
104         if (fd < 0)
105                 pr_err("failed to open %s : %s\n", data->file.path,
106                         str_error_r(errno, sbuf, sizeof(sbuf)));
107 
108         return fd;
109 }
110 
111 static int open_file(struct perf_data *data)
112 {
113         int fd;
114 
115         fd = perf_data__is_read(data) ?
116              open_file_read(data) : open_file_write(data);
117 
118         data->file.fd = fd;
119         return fd < 0 ? -1 : 0;
120 }
121 
122 int perf_data__open(struct perf_data *data)
123 {
124         if (check_pipe(data))
125                 return 0;
126 
127         if (!data->file.path)
128                 data->file.path = "perf.data";
129 
130         return open_file(data);
131 }
132 
133 void perf_data__close(struct perf_data *data)
134 {
135         close(data->file.fd);
136 }
137 
138 ssize_t perf_data_file__write(struct perf_data_file *file,
139                               void *buf, size_t size)
140 {
141         return writen(file->fd, buf, size);
142 }
143 
144 ssize_t perf_data__write(struct perf_data *data,
145                               void *buf, size_t size)
146 {
147         return perf_data_file__write(&data->file, buf, size);
148 }
149 
150 int perf_data__switch(struct perf_data *data,
151                            const char *postfix,
152                            size_t pos, bool at_exit)
153 {
154         char *new_filepath;
155         int ret;
156 
157         if (check_pipe(data))
158                 return -EINVAL;
159         if (perf_data__is_read(data))
160                 return -EINVAL;
161 
162         if (asprintf(&new_filepath, "%s.%s", data->file.path, postfix) < 0)
163                 return -ENOMEM;
164 
165         /*
166          * Only fire a warning, don't return error, continue fill
167          * original file.
168          */
169         if (rename(data->file.path, new_filepath))
170                 pr_warning("Failed to rename %s to %s\n", data->file.path, new_filepath);
171 
172         if (!at_exit) {
173                 close(data->file.fd);
174                 ret = perf_data__open(data);
175                 if (ret < 0)
176                         goto out;
177 
178                 if (lseek(data->file.fd, pos, SEEK_SET) == (off_t)-1) {
179                         ret = -errno;
180                         pr_debug("Failed to lseek to %zu: %s",
181                                  pos, strerror(errno));
182                         goto out;
183                 }
184         }
185         ret = data->file.fd;
186 out:
187         free(new_filepath);
188         return ret;
189 }
190 

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