This line will only be executed when op is notepoll_ctl_del,epoll_ctl_add, orepoll_ctl_mod. But this will always error out earlier in this check: miri/src/shims/unix/linux/epoll.rs ifop&epoll_ctl_add != epoll_ctl_add && op&epoll_ctl_mod != epoll_ctl_mod && op&epoll_ctl_del ...
错误返回-1。错误码error会被设置。 错误码: EBADF:epfd或者fd不是一个有效的文件描述符。 EEXIST:当参数是EPOLL_CTL_ADD时,当添加到fd已经在epfd中时,重复添加。 EINVAL: 1、当epfd不是一个文件描述符,或者fd是一个epfd,或者op是不支持的参数。 2、设置了参数EPOLLEXCLUSIVE,却没有和其它有效的参数一起设置...
intepoll_wait(intepfd,//epoll_create()函数返回的epoll实例的句柄。structepoll_event * events,//接口的返回参数,epoll把发生的事件的集合从内核复制到 events数组中。intmaxevents,//表示本次可以返回的最大事件数目,通常maxevents参数与预分配的events数组的大小是相等的。inttimeout);//表示在没有检测到事件...
epds.events|=POLLERR|POLLHUP; error=ep_insert(ep,&epds,tfile,fd); }else error=-EEXIST; break; caseEPOLL_CTL_DEL: if(epi) error=ep_remove(ep,epi); else error=-ENOENT; break; caseEPOLL_CTL_MOD: if(epi){ epds.events|=POLLERR|POLLHUP; error=ep_modify(ep,epi,&epds); }else error=...
295:M 24 Aug 2019 00:33:33.211 # Error registering fd event for the new client: No such file or directory (fd=261) === KEYDB BUG REPORT START: Cut & paste starting from here === 295:M 24 Aug 2019 00:33:35.305 # KeyDB 5.0.0 crashed by signal: 11 ...
error=-EPERM; if(!tfile->f_op||!tfile->f_op->poll)//如果要监听的fd不支持poll的话就没办法了 只能报error了. gotoerror_tgt_fput; /* * We have to check that the file structure underneath the file descriptor * the user passed to us _is_ an eventpoll file. And also we do not ...
在linux新的内核中,有了一种替换它的机制,就是epoll。相比于select,epoll最大的好处在于它不会随着监听fd数目的增长而降低效率。因为在内核中的select实现中,它是采用轮询来处理的,轮询的fd数目越多,自然耗时越多。并且,linux/posix_types.h头文件有这样的声明:...
EPOLLERRAn error condition occurred on the associated file descriptor. This error is also reported if any side of a pipe is closed. epoll_waitwill always report this event. You do not have to request this as an I/O event. EPOLLONESHOTRequests that one-shot notification for ...
16.fprintf(stderr, "epoll set insertion error: fd=%d\n", 17.client); 18.return -1; 19.} 20.} 21.else 22.do_use_fd(events[n].data.fd); 23.} 24.} 此时使用的是ET模式,即,边沿触发,类似于电平触发,epoll中的边沿触发的意思是只对新到的数据进行通知,而内核缓冲区中如果是旧数据则不进...
epoll_ctl用来添加/修改/删除需要侦听的文件描述符及其事件 epoll_ctl函数原型：int epoll_ctl(int epfd, int op, int fd, struct epoll_event *event); 成功返回0 ； 失败返回-1.可以