2 * probe-file.c : operate ftrace k/uprobe events files
4 * Written by Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
25 #include <api/fs/tracing_path.h>
26 #include "probe-event.h"
27 #include "probe-file.h"
30 #define MAX_CMDLEN 256
32 static void print_open_warning(int err, bool uprobe)
34 char sbuf[STRERR_BUFSIZE];
40 config = "CONFIG_UPROBE_EVENTS";
42 config = "CONFIG_KPROBE_EVENTS";
44 pr_warning("%cprobe_events file does not exist"
45 " - please rebuild kernel with %s.\n",
46 uprobe ? 'u' : 'k', config);
47 } else if (err == -ENOTSUP)
48 pr_warning("Tracefs or debugfs is not mounted.\n");
50 pr_warning("Failed to open %cprobe_events: %s\n",
52 strerror_r(-err, sbuf, sizeof(sbuf)));
55 static void print_both_open_warning(int kerr, int uerr)
57 /* Both kprobes and uprobes are disabled, warn it. */
58 if (kerr == -ENOTSUP && uerr == -ENOTSUP)
59 pr_warning("Tracefs or debugfs is not mounted.\n");
60 else if (kerr == -ENOENT && uerr == -ENOENT)
61 pr_warning("Please rebuild kernel with CONFIG_KPROBE_EVENTS "
62 "or/and CONFIG_UPROBE_EVENTS.\n");
64 char sbuf[STRERR_BUFSIZE];
65 pr_warning("Failed to open kprobe events: %s.\n",
66 strerror_r(-kerr, sbuf, sizeof(sbuf)));
67 pr_warning("Failed to open uprobe events: %s.\n",
68 strerror_r(-uerr, sbuf, sizeof(sbuf)));
72 static int open_probe_events(const char *trace_file, bool readwrite)
75 const char *tracing_dir = "";
78 ret = e_snprintf(buf, PATH_MAX, "%s/%s%s",
79 tracing_path, tracing_dir, trace_file);
81 pr_debug("Opening %s write=%d\n", buf, readwrite);
82 if (readwrite && !probe_event_dry_run)
83 ret = open(buf, O_RDWR | O_APPEND, 0);
85 ret = open(buf, O_RDONLY, 0);
93 static int open_kprobe_events(bool readwrite)
95 return open_probe_events("kprobe_events", readwrite);
98 static int open_uprobe_events(bool readwrite)
100 return open_probe_events("uprobe_events", readwrite);
103 int probe_file__open(int flag)
107 if (flag & PF_FL_UPROBE)
108 fd = open_uprobe_events(flag & PF_FL_RW);
110 fd = open_kprobe_events(flag & PF_FL_RW);
112 print_open_warning(fd, flag & PF_FL_UPROBE);
117 int probe_file__open_both(int *kfd, int *ufd, int flag)
122 *kfd = open_kprobe_events(flag & PF_FL_RW);
123 *ufd = open_uprobe_events(flag & PF_FL_RW);
124 if (*kfd < 0 && *ufd < 0) {
125 print_both_open_warning(*kfd, *ufd);
132 /* Get raw string list of current kprobe_events or uprobe_events */
133 struct strlist *probe_file__get_rawlist(int fd)
137 char buf[MAX_CMDLEN];
144 sl = strlist__new(NULL, NULL);
146 fp = fdopen(dup(fd), "r");
148 p = fgets(buf, MAX_CMDLEN, fp);
155 ret = strlist__add(sl, buf);
157 pr_debug("strlist__add failed (%d)\n", ret);
167 static struct strlist *__probe_file__get_namelist(int fd, bool include_group)
170 struct strlist *sl, *rawlist;
171 struct str_node *ent;
172 struct probe_trace_event tev;
175 memset(&tev, 0, sizeof(tev));
176 rawlist = probe_file__get_rawlist(fd);
179 sl = strlist__new(NULL, NULL);
180 strlist__for_each(ent, rawlist) {
181 ret = parse_probe_trace_command(ent->s, &tev);
185 ret = e_snprintf(buf, 128, "%s:%s", tev.group,
188 ret = strlist__add(sl, buf);
190 ret = strlist__add(sl, tev.event);
191 clear_probe_trace_event(&tev);
195 strlist__delete(rawlist);
204 /* Get current perf-probe event names */
205 struct strlist *probe_file__get_namelist(int fd)
207 return __probe_file__get_namelist(fd, false);
210 int probe_file__add_event(int fd, struct probe_trace_event *tev)
213 char *buf = synthesize_probe_trace_command(tev);
214 char sbuf[STRERR_BUFSIZE];
217 pr_debug("Failed to synthesize probe trace event.\n");
221 pr_debug("Writing event: %s\n", buf);
222 if (!probe_event_dry_run) {
223 if (write(fd, buf, strlen(buf)) < (int)strlen(buf)) {
225 pr_warning("Failed to write event: %s\n",
226 strerror_r(errno, sbuf, sizeof(sbuf)));
234 static int __del_trace_probe_event(int fd, struct str_node *ent)
240 /* Convert from perf-probe event to trace-probe event */
241 ret = e_snprintf(buf, 128, "-:%s", ent->s);
245 p = strchr(buf + 2, ':');
247 pr_debug("Internal error: %s should have ':' but not.\n",
254 pr_debug("Writing event: %s\n", buf);
255 ret = write(fd, buf, strlen(buf));
263 pr_warning("Failed to delete event: %s\n",
264 strerror_r(-ret, buf, sizeof(buf)));
268 int probe_file__get_events(int fd, struct strfilter *filter,
269 struct strlist *plist)
271 struct strlist *namelist;
272 struct str_node *ent;
279 namelist = __probe_file__get_namelist(fd, true);
283 strlist__for_each(ent, namelist) {
284 p = strchr(ent->s, ':');
285 if ((p && strfilter__compare(filter, p + 1)) ||
286 strfilter__compare(filter, ent->s)) {
287 strlist__add(plist, ent->s);
291 strlist__delete(namelist);
296 int probe_file__del_strlist(int fd, struct strlist *namelist)
299 struct str_node *ent;
301 strlist__for_each(ent, namelist) {
302 ret = __del_trace_probe_event(fd, ent);
309 int probe_file__del_events(int fd, struct strfilter *filter)
311 struct strlist *namelist;
314 namelist = strlist__new(NULL, NULL);
318 ret = probe_file__get_events(fd, filter, namelist);
322 ret = probe_file__del_strlist(fd, namelist);
323 strlist__delete(namelist);