fusl/src/linux/ptrace.c

#include <sys/ptrace.h>
#include <stdarg.h>
#include <unistd.h>
#include "syscall.h"

long ptrace(int req, ...) {
  va_list ap;
  pid_t pid;
  void *addr, *data, *addr2;
  long ret, result;

  va_start(ap, req);
  pid = va_arg(ap, pid_t);
  addr = va_arg(ap, void*);
  data = va_arg(ap, void*);
  addr2 = va_arg(ap, void*);
  va_end(ap);

  if (req - 1U < 3)
    data = &result;
  ret = syscall(SYS_ptrace, req, pid, addr, data, addr2);

  if (ret < 0 || req - 1U >= 3)
    return ret;
  return result;
}