void signal_term_handler(int sig)
{
    printf("EXIT :TERM signal Received!\n");
    int rc = flock(pid_file,LOCK_UN | LOCK_NB);
    if(rc) {
        char *piderr = "PID file unlock Failed!";
        fprintf(stderr,"%s\n",piderr);
        printf(piderr);
    }
    abort();
}

有人告诉我,flock和printf不是异步信号安全的.而且我找不到另一个异步信号安全函数flockin这个list.

并根据以上链接：

when a signal interrupts an unsafe function and the signal-catching
function calls an unsafe function,the behavior is undefined

有没有办法使flock异步信号安全？或者,当我收到TERM信号时,是否有另一种解决方案来执行flock？