问如果我的系统调用引发错误，是否可以容忍？

EN

#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>

#define CHECK(syscall, msg) do {                    \
    if ((syscall) == -1) {                          \
      perror(msg);                                  \
      _exit(1);                                     \
    }                                               \
  } while(0)

int main () {
  int ls_pid;
  char *ls_argv[] = { "ls", NULL };

  CHECK(ls_pid = fork(), "fork error");
  if (!ls_pid) {
    CHECK(setpgid(0, 0), "setpgid error");
    CHECK(tcsetpgrp(STDIN_FILENO, 0), "tcsetpgrp error");
    CHECK(execvp(ls_argv[0], ls_argv), "execvp error");
  } else {
    // sleep(2);
    setpgid(ls_pid, ls_pid); // This might give error if the child process has entered execvp. 
    // It returns -1 if uncommenting the sleep(2) above.
  }

  CHECK(wait(NULL), "wait error");
  printf("Finish\n");
}