我们可以使用带有未命名管道的poll函数吗？

我正在尝试编写一个程序,我需要监视某些事件的未命名管道的末尾.我可以使用带有轮询功能的未命名管道.

如果是,请告诉我功能描述符的poll功能的语法

解决方法:

民意调查的一个例子

要使用poll来检查readfd是否可读或writefd是否可写：

int readfd;
int writefd;
// initialize readfd & writefd, ...
// e.g. with: open(2), socket(2), pipe(2), dup(2) syscalls
struct pollfd fdtab[2];
memset (fdtab, 0, sizeof(fdtab)); // not necessary, but I am paranoid
// first slot for readfd polled for input
fdtab[0].fd = readfd;
fdtab[0].events = POLLIN;
fdtab[0].revents = 0;
// second slot with writefd polled for output
fdtab[1].fd = writefd;
fdtab[1].events = POLLOUT;
fdtab[1].revents = 0;
// do the poll(2) syscall with a 100 millisecond timeout
int retpoll = poll(fdtab, 2, 100);
if (retpoll > 0) {
if (fdtab[0].revents & POLLIN) {
/* read from readfd,
since you can read from it without being blocked */
}
if (fdtab[1].revents & POLLOUT) {
/* write to writefd,
since you can write to it without being blocked */
}
}
else if (retpoll == 0) {
/* the poll has timed out, nothing can be read or written */
}
else {
/* the poll failed */
perror("poll failed");
}