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#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <errno.h>
#include <sys/param.h>
#include <signal.h>
#include <sys/wait.h>
#include "common.h"
char *command = NULL;
Process *list_of_processes = NULL;
int exiting = 0; /* =1 if a SIGINT or SIGTERM has been received */
static void
signal_alarm(int sig) {
Process *tmp = list_of_processes;
signal(SIGALRM, SIG_DFL);
while (tmp) {
struct opt_p_t *tmp2 = opt_p;
while (tmp2) {
if (tmp->pid == tmp2->pid) {
tmp = tmp->next;
if (!tmp) {
return;
}
tmp2 = opt_p;
continue;
}
tmp2 = tmp2->next;
}
debug(2, "Sending SIGSTOP to process %u\n", tmp->pid);
kill(tmp->pid, SIGSTOP);
tmp = tmp->next;
}
}
static void
signal_exit(int sig) {
exiting = 1;
debug(1, "Received interrupt signal; exiting...");
signal(SIGINT, SIG_IGN);
signal(SIGTERM, SIG_IGN);
signal(SIGALRM, signal_alarm);
if (opt_p) {
struct opt_p_t *tmp = opt_p;
while (tmp) {
debug(2, "Sending SIGSTOP to process %u\n", tmp->pid);
kill(tmp->pid, SIGSTOP);
tmp = tmp->next;
}
}
alarm(1);
}
static void
normal_exit(void) {
output_line(0, 0);
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);
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);
}
opt_F = opt_F->next;
}
if (opt_e) {
struct opt_e_t *tmp = opt_e;
while (tmp) {
debug(1, "Option -e: %s\n", tmp->name);
tmp = tmp->next;
}
}
if (command) {
execute_program(open_program(command, 0), argv);
}
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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