int wait_pids()
{
struct trace_data data;
int count, continued, terminated;
pid_t pid; int wait_status;
a_flagged_each(&waitproc_options.pids, &attach_process, trace_data_init(&data));
waitproc_flags_setc(WAITPROC_FLAG_ERROROCCURED, data.error_occured);
if (data.count <= 0)
return data.count;
count = data.count;
if (waitproc_flags_test(WAITPROC_FLAG_TERMINATE)) {
data.target_state = STATE_ATTACHED;
data.d.signal = termination_signals;
a_flagged_each(&waitproc_options.pids, &send_signal, trace_data_init(&data));
waitproc_flags_setc(WAITPROC_FLAG_ERROROCCURED, data.error_occured);
if (data.count <= 0)
return data.count;
}
continued = 0;
terminated = 0;
do {
pid = waitpid(-1, &wait_status, WUNTRACED);
} while (handle_wait(pid, wait_status, count, &continued, &terminated));
if (waitproc_flags_test(WAITPROC_FLAG_KILL)) {
data.target_state = STATE_TERMINATED;
data.d.trace_type = PTRACE_KILL;
terminated = count;
} else {
data.target_state = STATE_DETACHED;
data.d.trace_type = PTRACE_DETACH;
}
a_flagged_each(&waitproc_options.pids, &detach_process, trace_data_init(&data));
waitproc_flags_setc(WAITPROC_FLAG_ERROROCCURED, data.error_occured);
return terminated;
}
/*
* System call handler
*
* retrieves system call number from user space
* and invokes the requested method
*/
static void
syscall_handler (struct intr_frame *f)
{
/* retrieve system call number
and switch to corresponding method */
unsigned int syscall_number = *((unsigned int*) syscall_get_kernel_address(f->esp));
switch(syscall_number)
{
/* process system calls */
case SYS_HALT:
handle_halt(f);
break;
case SYS_EXIT:
handle_exit(f);
break;
case SYS_EXEC:
handle_exec(f);
break;
case SYS_WAIT:
handle_wait(f);
break;
/* file system calls */
case SYS_CREATE:
handle_create(f);
break;
case SYS_REMOVE:
handle_remove(f);
break;
case SYS_OPEN:
handle_open(f);
break;
case SYS_FILESIZE:
handle_filesize(f);
break;
case SYS_READ:
handle_read(f);
break;
case SYS_WRITE:
handle_write(f);
break;
case SYS_SEEK:
handle_seek(f);
break;
case SYS_TELL:
handle_tell(f);
break;
case SYS_CLOSE:
handle_close(f);
break;
case SYS_CHDIR:
handle_chdir(f);
break;
case SYS_MKDIR:
handle_mkdir(f);
break;
case SYS_READDIR:
handle_readdir(f);
break;
case SYS_ISDIR:
handle_isdir(f);
break;
case SYS_INUMBER:
handle_inumber(f);
break;
default: /* SYSCALL_ERROR: */
handle_no_such_syscall(f);
break;
}
}
