src/tests/system/kernel/fifo_poll_test.cpp

   1 #include <stdio.h>
   2 #include <poll.h>
   3
   4 int main() {
   5         FILE* f = popen("/bin/bash -c 'for i in 1 2 3; do { echo $i; sleep 1; }; done'", "r");
   6         printf("f=%p\n", f);
   7         int fd = fileno(f);
   8         printf("fd=%d\n", fd);
   9
  10         struct pollfd pfd;
  11         pfd.fd = fd;
  12         pfd.events = POLLIN | POLLRDBAND;
  13
  14         char buffer[80];
  15
  16         while (1) {
  17                 int rv = poll(&pfd, 1, 500);
  18                 printf("rv=%d\n", rv);
  19                 if (rv == 0)
  20                         continue;
  21                 if (rv < 0)
  22                         break;
  23                 printf("events=%08x revents=%08x\n", pfd.events, pfd.revents);
  24                 if ((pfd.events & pfd.revents) == 0)
  25                         break;
  26
  27                 fgets(buffer, 79, f);
  28                 printf("output: %s", buffer);
  29         }
  30
  31         return 0;
  32 }