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#if HAVE_CONFIG_H
#include "config.h"
#endif
#define _GNU_SOURCE 1
#include <sys/types.h>
#include <sys/wait.h>
#include <errno.h>
#include <signal.h>
#include <string.h>
#include "ltrace.h"
#include "options.h"
#include "output.h"
static struct event event;
/* This should also update `current_process' */
static struct process * pid2proc(int pid);
struct event * wait_for_something(void)
{
pid_t pid;
int status;
int tmp;
if (!list_of_processes) {
if (opt_d) {
output_line(0, "No more children");
}
exit(0);
}
pid = wait(&status);
if (pid==-1) {
if (errno==ECHILD) {
if (opt_d) {
output_line(0, "No more children");
}
exit(0);
} else if (errno==EINTR) {
if (opt_d) {
output_line(0, "wait received EINTR ?");
}
event.thing = LT_EV_NONE;
return &event;
}
perror("wait");
exit(1);
}
event.proc = pid2proc(pid);
if (!event.proc) {
fprintf(stderr, "signal from wrong pid %u ?!?\n", pid);
exit(1);
}
event.proc->instruction_pointer = NULL;
if (opt_d>2) {
output_line(0,"signal from pid %u", pid);
}
if (event.proc->breakpoints_enabled == -1) {
enable_all_breakpoints(event.proc);
event.thing = LT_EV_NONE;
continue_process(event.proc->pid);
return &event;
}
if (opt_i) {
event.proc->instruction_pointer = get_instruction_pointer(pid);
}
switch(syscall_p(event.proc, status, &tmp)) {
case 1: event.thing = LT_EV_SYSCALL;
event.e_un.sysnum = tmp;
return &event;
case 2: event.thing = LT_EV_SYSRET;
event.e_un.sysnum = tmp;
return &event;
default:
}
if (WIFEXITED(status)) {
event.thing = LT_EV_EXIT;
event.e_un.ret_val = WEXITSTATUS(status);
return &event;
}
if (WIFSIGNALED(status)) {
event.thing = LT_EV_EXIT_SIGNAL;
event.e_un.signum = WTERMSIG(status);
return &event;
}
if (!WIFSTOPPED(status)) {
event.thing = LT_EV_UNKNOWN;
return &event;
}
if (WSTOPSIG(status) != SIGTRAP) {
event.thing = LT_EV_SIGNAL;
event.e_un.signum = WSTOPSIG(status);
return &event;
}
event.thing = LT_EV_BREAKPOINT;
if (!event.proc->instruction_pointer) {
event.proc->instruction_pointer = get_instruction_pointer(pid);
}
event.e_un.brk_addr = event.proc->instruction_pointer - DECR_PC_AFTER_BREAK;
return &event;
}
static struct process * pid2proc(pid_t pid)
{
struct process * tmp;
tmp = list_of_processes;
while(tmp) {
if (pid == tmp->pid) {
return tmp;
}
tmp = tmp->next;
}
return NULL;
}
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