F_GETPIPE_SZ在C中返回-1。-F_GETPIPE_SZreturns-1inC

Why would F_GETPIPE_SZ return -1? It sounds like an error, but I can't find any mention of what error it is, or, more importantly, what I'm supposed to do to not get the error.

为什么F_GETPIPE_SZ返回-1?这听起来像是一个错误，但我找不到任何关于它是什么错误的，或者更重要的是，我应该做些什么来避免错误。

I'm running Raspbian on a Raspberry Pi, for what it's worth. I haven't tried the code on my desktop Debian yet. As far as I can tell, I'm following the textbook F_GETPIPE_SZ example. Am I missing something?

我在树莓派上运行的是Raspbian，它值多少钱。我还没试过桌面Debian的代码。据我所知，我是按照课本F_GETPIPE_SZ的例子。我遗漏了什么东西?

#define _GNU_SOURCE
#include 
#include 
#include 
#include 

int main(int argc, char **argv)
{
  int fd, pipesize;
  fd = mkfifo("/tmp/audio-fifo",0666);
  //  fcntl(fd, F_SETPIPE_SZ, 4096);
  pipesize = fcntl(fd, F_GETPIPE_SZ);
  printf("Pipe size: %d\n", pipesize);
  return 0;
}

1 个解决方案