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/*
* Copyright (C) 2015 Red Hat Inc, Steven Rostedt <srostedt@redhat.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License (not later!)
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this program; if not, see <http://www.gnu.org/licenses>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <stdio.h>
#include <stdlib.h>
#include <ctype.h>
#include "trace-cmd.h"
#include "event-utils.h"
struct hook_list *tracecmd_create_event_hook(const char *arg)
{
struct hook_list *hook;
char *system = NULL;
char *event;
char *match;
char *flags = NULL;
char *pid = NULL;
char *str;
char *tok;
int index;
int ch;
int i;
hook = malloc(sizeof(*hook));
if (!hook)
return NULL;
memset(hook, 0, sizeof(*hook));
str = strdup(arg);
if (!str) {
free(hook);
return NULL;
}
hook->str = str;
hook->hook = arg;
/*
* Hooks are in the form of:
* [<start_system>:]<start_event>,<start_match>[,<start_pid>]/
* [<end_system>:]<end_event>,<end_match>[,<flags>]
*
* Where start_system, start_pid, end_system, and flags are all
* optional.
*
* Flags are (case insensitive):
* P - pinned to cpu (wont migrate)
* G - global, not hooked to task - currently ignored.
* S - save stacks for this event.
*/
tok = strtok(str, ":,");
if (!tok)
goto invalid_tok;
/* See what the token was from the original arg */
index = strlen(tok);
if (arg[index] == ':') {
/* this is a system, the next token must be ',' */
system = tok;
tok = strtok(NULL, ",");
if (!tok)
goto invalid_tok;
}
event = tok;
tok = strtok(NULL, ",/");
if (!tok)
goto invalid_tok;
match = tok;
index = strlen(tok) + tok - str;
if (arg[index] == ',') {
tok = strtok(NULL, "/");
if (!tok)
goto invalid_tok;
pid = tok;
}
hook->start_system = system;
hook->start_event = event;
hook->start_match = match;
hook->pid = pid;
/* Now process the end event */
system = NULL;
tok = strtok(NULL, ":,");
if (!tok)
goto invalid_tok;
/* See what the token was from the original arg */
index = tok - str + strlen(tok);
if (arg[index] == ':') {
/* this is a system, the next token must be ',' */
system = tok;
tok = strtok(NULL, ",");
if (!tok)
goto invalid_tok;
}
event = tok;
tok = strtok(NULL, ",");
if (!tok)
goto invalid_tok;
match = tok;
index = strlen(tok) + tok - str;
if (arg[index] == ',') {
tok = strtok(NULL, "");
if (!tok)
goto invalid_tok;
flags = tok;
}
hook->end_system = system;
hook->end_event = event;
hook->end_match = match;
hook->migrate = 1;
if (flags) {
for (i = 0; flags[i]; i++) {
ch = tolower(flags[i]);
switch (ch) {
case 'p':
hook->migrate = 0;
break;
case 'g':
hook->global = 1;
break;
case 's':
hook->stack = 1;
break;
default:
warning("unknown flag %c\n", flags[i]);
}
}
}
printf("start %s:%s:%s (%s) end %s:%s:%s (%s)\n",
hook->start_system,
hook->start_event,
hook->start_match,
hook->pid,
hook->end_system,
hook->end_event,
hook->end_match,
flags);
return hook;
invalid_tok:
warning("Invalid hook format '%s'", arg);
return NULL;
}
void tracecmd_free_hooks(struct hook_list *hooks)
{
struct hook_list *hook;
while (hooks) {
hook = hooks;
hooks = hooks->next;
free(hook->str);
free(hook);
}
}
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