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c++linuxpipenamed-pipes
Hamid Bazargani
Hamid Bazargani

Reputation: 868

My C++ program cannot open named pipe

I am trying to run C++ application that works perfectly on Mac OS under Ubuntu. The problem is due to failure in opening a named pipe.

I used mkfifo as follows:

  pipe_name_ = std::string("/tmp/myfifo");
  if (mkfifo(pipe_name_.c_str(), 0666) < 0) {
     error_print("Cannot create a named pipe\n");
     return -1;
  }

  if ((fd_ = open(pipe_name_.c_str(), O_RDONLY | O_CREAT, 0666)) < 0) {
     error_print("Cannot open file description named %s %s\n",
                 pipe_name_.c_str(), strerror(errno));
     return -1;
  }

However, this prints into screen the bellow message that is for open():

Cannot open file description named /tmp/myfifo Invalid argument

My permissions status is as bellow:

$ls -la /tmp/myfifo
prw-r----- 1 hamidb nonconf 0 Jun 20 13:35 /tmp/myfifo
$umask
0027

I am wondering why it was working fine on Mac OS and not on Linux.

Upvotes: 0

Views: 1052

Answers (1)

Ed Heal
Ed Heal

Reputation: 59987

I believe that you have the wrong flags for open as you are not creating the file.

It should be 

open(pipe_name_.c_str(), O_RDONLY)

Upvotes: 3

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