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/*
* This file is part of ltrace.
* Copyright (C) 2011,2012 Petr Machata, Red Hat Inc.
* Copyright (C) 2009 Juan Cespedes
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation; either version 2 of the
* License, or (at your option) any later version.
*
* 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include "config.h"
#include <sys/param.h>
#include <sys/wait.h>
#include <errno.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "common.h"
#include "proc.h"
#include "read_config_file.h"
#include "backend.h"
char *command = NULL;
int exiting = 0; /* =1 if a SIGINT or SIGTERM has been received */
static enum callback_status
stop_non_p_processes(Process *proc, void *data)
{
int stop = 1;
struct opt_p_t *it;
for (it = opt_p; it != NULL; it = it->next) {
Process * p_proc = pid2proc(it->pid);
if (p_proc == NULL) {
printf("stop_non_p_processes: %d terminated?\n", it->pid);
continue;
}
if (p_proc == proc || p_proc->leader == proc->leader) {
stop = 0;
break;
}
}
if (stop) {
debug(2, "Sending SIGSTOP to process %u", proc->pid);
kill(proc->pid, SIGSTOP);
}
return CBS_CONT;
}
static void
signal_alarm(int sig) {
signal(SIGALRM, SIG_DFL);
each_process(NULL, &stop_non_p_processes, NULL);
}
static void
signal_exit(int sig)
{
if (exiting != 0)
return;
exiting = 1 + !!os_ltrace_exiting_sighandler();
signal(SIGINT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
signal(SIGALRM, signal_alarm);
//alarm(1);
}
static void
normal_exit(void)
{
if (options.summary) {
show_summary();
}
if (options.output) {
fclose(options.output);
options.output = NULL;
}
}
void
ltrace_init(int argc, char **argv) {
struct opt_p_t *opt_p_tmp;
atexit(normal_exit);
signal(SIGINT, signal_exit); /* Detach processes when interrupted */
signal(SIGTERM, signal_exit); /* ... or killed */
argv = process_options(argc, argv);
init_global_config();
while (opt_F) {
/* If filename begins with ~, expand it to the user's home */
/* directory. This does not correctly handle ~yoda, but that */
/* isn't as bad as it seems because the shell will normally */
/* be doing the expansion for us; only the hardcoded */
/* ~/.ltrace.conf should ever use this code. */
if (opt_F->filename[0] == '~') {
char path[PATH_MAX];
char *home_dir = getenv("HOME");
if (home_dir) {
strncpy(path, home_dir, PATH_MAX - 1);
path[PATH_MAX - 1] = '\0';
strncat(path, opt_F->filename + 1,
PATH_MAX - strlen(path) - 1);
read_config_file(path);
}
} else {
read_config_file(opt_F->filename);
}
struct opt_F_t *next = opt_F->next;
if (opt_F->own_filename)
free(opt_F->filename);
free(opt_F);
opt_F = next;
}
if (command) {
/* Check that the binary ABI is supported before
* calling execute_program. */
struct ltelf lte = {};
open_elf(<e, command);
do_close_elf(<e);
pid_t pid = execute_program(command, argv);
struct Process *proc = open_program(command, pid);
if (proc == NULL) {
fprintf(stderr, "couldn't open program '%s': %s\n",
command, strerror(errno));
exit(EXIT_FAILURE);
}
trace_set_options(proc);
continue_process(pid);
}
opt_p_tmp = opt_p;
while (opt_p_tmp) {
open_pid(opt_p_tmp->pid);
opt_p_tmp = opt_p_tmp->next;
}
}
static int num_ltrace_callbacks[EVENT_MAX];
static callback_func * ltrace_callbacks[EVENT_MAX];
void
ltrace_add_callback(callback_func func, Event_type type) {
ltrace_callbacks[type] = realloc(ltrace_callbacks[type], (num_ltrace_callbacks[type]+1)*sizeof(callback_func));
ltrace_callbacks[type][num_ltrace_callbacks[type]++] = func;
}
static void
dispatch_callbacks(Event * ev) {
int i;
/* Ignoring case 1: signal into a dying tracer */
if (ev->type==EVENT_SIGNAL &&
exiting && ev->e_un.signum == SIGSTOP) {
return;
}
/* Ignoring case 2: process being born before a clone event */
if (ev->proc && ev->proc->state == STATE_IGNORED) {
return;
}
for (i=0; i<num_ltrace_callbacks[ev->type]; i++) {
ltrace_callbacks[ev->type][i](ev);
}
}
void
ltrace_main(void) {
Event * ev;
while (1) {
ev = next_event();
dispatch_callbacks(ev);
handle_event(ev);
}
}
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