327 строки
6.9 KiB
C
327 строки
6.9 KiB
C
/*
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* probe-file.c : operate ftrace k/uprobe events files
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*
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* Written by Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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*/
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#include "util.h"
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#include "event.h"
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#include "strlist.h"
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#include "debug.h"
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#include "cache.h"
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#include "color.h"
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#include "symbol.h"
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#include "thread.h"
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#include <api/fs/tracing_path.h>
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#include "probe-event.h"
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#include "probe-file.h"
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#include "session.h"
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#define MAX_CMDLEN 256
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static void print_open_warning(int err, bool uprobe)
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{
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char sbuf[STRERR_BUFSIZE];
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if (err == -ENOENT) {
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const char *config;
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if (uprobe)
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config = "CONFIG_UPROBE_EVENTS";
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else
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config = "CONFIG_KPROBE_EVENTS";
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pr_warning("%cprobe_events file does not exist"
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" - please rebuild kernel with %s.\n",
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uprobe ? 'u' : 'k', config);
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} else if (err == -ENOTSUP)
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pr_warning("Tracefs or debugfs is not mounted.\n");
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else
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pr_warning("Failed to open %cprobe_events: %s\n",
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uprobe ? 'u' : 'k',
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strerror_r(-err, sbuf, sizeof(sbuf)));
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}
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static void print_both_open_warning(int kerr, int uerr)
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{
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/* Both kprobes and uprobes are disabled, warn it. */
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if (kerr == -ENOTSUP && uerr == -ENOTSUP)
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pr_warning("Tracefs or debugfs is not mounted.\n");
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else if (kerr == -ENOENT && uerr == -ENOENT)
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pr_warning("Please rebuild kernel with CONFIG_KPROBE_EVENTS "
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"or/and CONFIG_UPROBE_EVENTS.\n");
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else {
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char sbuf[STRERR_BUFSIZE];
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pr_warning("Failed to open kprobe events: %s.\n",
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strerror_r(-kerr, sbuf, sizeof(sbuf)));
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pr_warning("Failed to open uprobe events: %s.\n",
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strerror_r(-uerr, sbuf, sizeof(sbuf)));
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}
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}
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static int open_probe_events(const char *trace_file, bool readwrite)
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{
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char buf[PATH_MAX];
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const char *tracing_dir = "";
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int ret;
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ret = e_snprintf(buf, PATH_MAX, "%s/%s%s",
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tracing_path, tracing_dir, trace_file);
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if (ret >= 0) {
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pr_debug("Opening %s write=%d\n", buf, readwrite);
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if (readwrite && !probe_event_dry_run)
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ret = open(buf, O_RDWR | O_APPEND, 0);
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else
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ret = open(buf, O_RDONLY, 0);
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if (ret < 0)
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ret = -errno;
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}
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return ret;
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}
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static int open_kprobe_events(bool readwrite)
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{
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return open_probe_events("kprobe_events", readwrite);
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}
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static int open_uprobe_events(bool readwrite)
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{
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return open_probe_events("uprobe_events", readwrite);
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}
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int probe_file__open(int flag)
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{
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int fd;
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if (flag & PF_FL_UPROBE)
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fd = open_uprobe_events(flag & PF_FL_RW);
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else
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fd = open_kprobe_events(flag & PF_FL_RW);
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if (fd < 0)
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print_open_warning(fd, flag & PF_FL_UPROBE);
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return fd;
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}
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int probe_file__open_both(int *kfd, int *ufd, int flag)
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{
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if (!kfd || !ufd)
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return -EINVAL;
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*kfd = open_kprobe_events(flag & PF_FL_RW);
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*ufd = open_uprobe_events(flag & PF_FL_RW);
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if (*kfd < 0 && *ufd < 0) {
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print_both_open_warning(*kfd, *ufd);
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return *kfd;
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}
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return 0;
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}
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/* Get raw string list of current kprobe_events or uprobe_events */
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struct strlist *probe_file__get_rawlist(int fd)
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{
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int ret, idx;
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FILE *fp;
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char buf[MAX_CMDLEN];
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char *p;
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struct strlist *sl;
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if (fd < 0)
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return NULL;
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sl = strlist__new(NULL, NULL);
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fp = fdopen(dup(fd), "r");
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while (!feof(fp)) {
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p = fgets(buf, MAX_CMDLEN, fp);
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if (!p)
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break;
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idx = strlen(p) - 1;
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if (p[idx] == '\n')
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p[idx] = '\0';
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ret = strlist__add(sl, buf);
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if (ret < 0) {
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pr_debug("strlist__add failed (%d)\n", ret);
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strlist__delete(sl);
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return NULL;
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}
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}
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fclose(fp);
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return sl;
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}
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static struct strlist *__probe_file__get_namelist(int fd, bool include_group)
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{
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char buf[128];
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struct strlist *sl, *rawlist;
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struct str_node *ent;
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struct probe_trace_event tev;
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int ret = 0;
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memset(&tev, 0, sizeof(tev));
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rawlist = probe_file__get_rawlist(fd);
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if (!rawlist)
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return NULL;
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sl = strlist__new(NULL, NULL);
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strlist__for_each(ent, rawlist) {
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ret = parse_probe_trace_command(ent->s, &tev);
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if (ret < 0)
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break;
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if (include_group) {
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ret = e_snprintf(buf, 128, "%s:%s", tev.group,
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tev.event);
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if (ret >= 0)
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ret = strlist__add(sl, buf);
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} else
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ret = strlist__add(sl, tev.event);
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clear_probe_trace_event(&tev);
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if (ret < 0)
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break;
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}
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strlist__delete(rawlist);
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if (ret < 0) {
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strlist__delete(sl);
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return NULL;
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}
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return sl;
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}
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/* Get current perf-probe event names */
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struct strlist *probe_file__get_namelist(int fd)
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{
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return __probe_file__get_namelist(fd, false);
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}
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int probe_file__add_event(int fd, struct probe_trace_event *tev)
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{
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int ret = 0;
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char *buf = synthesize_probe_trace_command(tev);
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char sbuf[STRERR_BUFSIZE];
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if (!buf) {
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pr_debug("Failed to synthesize probe trace event.\n");
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return -EINVAL;
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}
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pr_debug("Writing event: %s\n", buf);
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if (!probe_event_dry_run) {
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if (write(fd, buf, strlen(buf)) < (int)strlen(buf)) {
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ret = -errno;
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pr_warning("Failed to write event: %s\n",
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strerror_r(errno, sbuf, sizeof(sbuf)));
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}
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}
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free(buf);
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return ret;
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}
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static int __del_trace_probe_event(int fd, struct str_node *ent)
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{
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char *p;
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char buf[128];
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int ret;
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/* Convert from perf-probe event to trace-probe event */
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ret = e_snprintf(buf, 128, "-:%s", ent->s);
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if (ret < 0)
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goto error;
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p = strchr(buf + 2, ':');
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if (!p) {
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pr_debug("Internal error: %s should have ':' but not.\n",
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ent->s);
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ret = -ENOTSUP;
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goto error;
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}
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*p = '/';
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pr_debug("Writing event: %s\n", buf);
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ret = write(fd, buf, strlen(buf));
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if (ret < 0) {
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ret = -errno;
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goto error;
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}
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return 0;
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error:
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pr_warning("Failed to delete event: %s\n",
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strerror_r(-ret, buf, sizeof(buf)));
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return ret;
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}
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int probe_file__get_events(int fd, struct strfilter *filter,
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struct strlist *plist)
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{
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struct strlist *namelist;
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struct str_node *ent;
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const char *p;
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int ret = -ENOENT;
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if (!plist)
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return -EINVAL;
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namelist = __probe_file__get_namelist(fd, true);
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if (!namelist)
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return -ENOENT;
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strlist__for_each(ent, namelist) {
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p = strchr(ent->s, ':');
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if ((p && strfilter__compare(filter, p + 1)) ||
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strfilter__compare(filter, ent->s)) {
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strlist__add(plist, ent->s);
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ret = 0;
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}
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}
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strlist__delete(namelist);
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return ret;
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}
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int probe_file__del_strlist(int fd, struct strlist *namelist)
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{
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int ret = 0;
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struct str_node *ent;
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strlist__for_each(ent, namelist) {
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ret = __del_trace_probe_event(fd, ent);
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if (ret < 0)
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break;
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}
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return ret;
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}
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int probe_file__del_events(int fd, struct strfilter *filter)
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{
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struct strlist *namelist;
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int ret;
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namelist = strlist__new(NULL, NULL);
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if (!namelist)
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return -ENOMEM;
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ret = probe_file__get_events(fd, filter, namelist);
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if (ret < 0)
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return ret;
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ret = probe_file__del_strlist(fd, namelist);
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strlist__delete(namelist);
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return ret;
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}
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