linux/alsarawmidi/JackALSARawMidiUtil.cpp

   1 #include <cerrno>
   2 #include <cstring>
   3 #include <stdexcept>
   4
   5 #include <fcntl.h>
   6 #include <unistd.h>
   7
   8 #include "JackALSARawMidiUtil.h"
   9
  10 void
  11 Jack::CreateNonBlockingPipe(int *fds)
  12 {
  13     if (pipe(fds) == -1) {
  14         throw std::runtime_error(strerror(errno));
  15     }
  16     try {
  17         SetNonBlocking(fds[0]);
  18         SetNonBlocking(fds[1]);
  19     } catch (...) {
  20         close(fds[1]);
  21         close(fds[0]);
  22         throw;
  23     }
  24 }
  25
  26 void
  27 Jack::DestroyNonBlockingPipe(int *fds)
  28 {
  29     close(fds[1]);
  30     close(fds[0]);
  31 }
  32
  33 void
  34 Jack::SetNonBlocking(int fd)
  35 {
  36     int flags = fcntl(fd, F_GETFL);
  37     if (flags == -1) {
  38         throw std::runtime_error(strerror(errno));
  39     }
  40     if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1) {
  41         throw std::runtime_error(strerror(errno));
  42     }
  43 }