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#if HAVE_CONFIG_H
#include "config.h"
#endif
#define _GNU_SOURCE
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <signal.h>
#include "ltrace.h"
#include "output.h"
#include "options.h"
#include "elf.h"
static void process_signal(struct event * event);
static void process_exit(struct event * event);
static void process_exit_signal(struct event * event);
static void process_syscall(struct event * event);
static void process_sysret(struct event * event);
static void process_breakpoint(struct event * event);
void process_event(struct event * event)
{
switch (event->thing) {
case LT_EV_NONE:
return;
case LT_EV_SIGNAL:
if (opt_d>0) {
output_line(0, "event: signal (%d)", event->e_un.signum);
}
process_signal(event);
return;
case LT_EV_EXIT:
if (opt_d>0) {
output_line(0, "event: exit (%d)", event->e_un.ret_val);
}
process_exit(event);
return;
case LT_EV_EXIT_SIGNAL:
if (opt_d>0) {
output_line(0, "event: exit signal (%d)", event->e_un.signum);
}
process_exit_signal(event);
return;
case LT_EV_SYSCALL:
if (opt_d>0) {
output_line(0, "event: syscall (%d)", event->e_un.sysnum);
}
process_syscall(event);
return;
case LT_EV_SYSRET:
if (opt_d>0) {
output_line(0, "event: sysret (%d)", event->e_un.sysnum);
}
process_sysret(event);
return;
case LT_EV_BREAKPOINT:
process_breakpoint(event);
return;
default:
fprintf(stderr, "Error! unknown event?\n");
exit(1);
}
}
static char * shortsignal(int signum)
{
static char * signalent0[] = {
#include "signalent.h"
};
int nsignals0 = sizeof signalent0 / sizeof signalent0[0];
if (signum<0 || signum>nsignals0) {
return "UNKNOWN_SIGNAL";
} else {
return signalent0[signum];
}
}
static char * sysname(int sysnum)
{
static char result[128];
static char * syscalent0[] = {
#include "syscallent.h"
};
int nsyscals0 = sizeof syscalent0 / sizeof syscalent0[0];
if (sysnum<0 || sysnum>nsyscals0) {
sprintf(result, "SYS_%d", sysnum);
return result;
} else {
sprintf(result, "SYS_%s", syscalent0[sysnum]);
return result;
}
}
static void remove_proc(struct process * proc);
static void process_signal(struct event * event)
{
if (exiting && event->e_un.signum == SIGSTOP) {
pid_t pid = event->proc->pid;
disable_all_breakpoints(event->proc);
untrace_pid(pid);
remove_proc(event->proc);
continue_after_signal(pid, event->e_un.signum);
return;
}
output_line(event->proc, "--- %s (%s) ---",
shortsignal(event->e_un.signum), strsignal(event->e_un.signum));
continue_after_signal(event->proc->pid, event->e_un.signum);
}
static void process_exit(struct event * event)
{
output_line(event->proc, "+++ exited (status %d) +++",
event->e_un.ret_val);
remove_proc(event->proc);
}
static void process_exit_signal(struct event * event)
{
output_line(event->proc, "+++ killed by %s +++",
shortsignal(event->e_un.signum));
remove_proc(event->proc);
}
static void remove_proc(struct process * proc)
{
struct process *tmp, *tmp2;
if (opt_d) {
output_line(0,"Removing pid %u\n", proc->pid);
}
if (list_of_processes == proc) {
tmp = list_of_processes;
list_of_processes = list_of_processes->next;
free(tmp);
return;
}
tmp = list_of_processes;
while(tmp->next) {
if (tmp->next==proc) {
tmp2 = tmp->next;
tmp->next = tmp->next->next;
free(tmp2);
continue;
}
tmp = tmp->next;
}
}
static void process_syscall(struct event * event)
{
event->proc->current_syscall = event->e_un.sysnum;
if (opt_S) {
output_left(LT_TOF_SYSCALL, event->proc, sysname(event->e_un.sysnum));
}
if (fork_p(event->e_un.sysnum) || exec_p(event->e_un.sysnum)) {
disable_all_breakpoints(event->proc);
} else if (!event->proc->breakpoints_enabled) {
enable_all_breakpoints(event->proc);
}
continue_process(event->proc->pid);
}
static void process_sysret(struct event * event)
{
if (opt_S) {
output_right(LT_TOF_SYSCALL, event->proc, sysname(event->e_un.sysnum));
}
if (exec_p(event->e_un.sysnum)) {
if (gimme_arg(LT_TOF_SYSCALL,event->proc,-1)==0) {
event->proc->filename = pid2name(event->proc->pid);
event->proc->list_of_symbols = read_elf(event->proc->filename);
event->proc->breakpoints_enabled = -1;
} else {
enable_all_breakpoints(event->proc);
}
}
if (fork_p(event->e_un.sysnum)) {
if (opt_f) {
pid_t child = gimme_arg(LT_TOF_SYSCALL,event->proc,-1);
if (child>0) {
open_pid(child, 0);
}
}
enable_all_breakpoints(event->proc);
}
event->proc->current_syscall = -1;
continue_process(event->proc->pid);
}
static void process_breakpoint(struct event * event)
{
struct library_symbol * tmp;
if (opt_d>1) {
output_line(0,"event: breakpoint (0x%08x)", event->e_un.brk_addr);
}
if (event->proc->breakpoint_being_enabled) {
continue_enabling_breakpoint(event->proc->pid, event->proc->breakpoint_being_enabled);
event->proc->breakpoint_being_enabled = NULL;
return;
}
if (event->proc->current_symbol && event->e_un.brk_addr == event->proc->return_value.addr) {
output_right(LT_TOF_FUNCTION, event->proc, event->proc->current_symbol->name);
continue_after_breakpoint(event->proc, &event->proc->return_value, 1);
event->proc->current_symbol = NULL;
return;
}
tmp = event->proc->list_of_symbols;
while(tmp) {
if (event->e_un.brk_addr == tmp->brk.addr) {
if (event->proc->current_symbol) {
delete_breakpoint(event->proc->pid, &event->proc->return_value);
}
event->proc->current_symbol = tmp;
event->proc->stack_pointer = get_stack_pointer(event->proc->pid);
event->proc->return_addr = get_return_addr(event->proc->pid, event->proc->stack_pointer);
output_left(LT_TOF_FUNCTION, event->proc, tmp->name);
event->proc->return_value.addr = event->proc->return_addr;
insert_breakpoint(event->proc->pid, &event->proc->return_value);
continue_after_breakpoint(event->proc, &tmp->brk, 0);
return;
}
tmp = tmp->next;
}
output_line(event->proc, "breakpointed at 0x%08x (?)",
(unsigned)event->e_un.brk_addr);
continue_process(event->proc->pid);
}
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