what's the type of stdin?

This is a discussion on what's the type of stdin? within the Linux Programming forums, part of the Platform Specific Boards category; I am trying to make a rw version of popen (by returning a pair of pipes), but I am having ...

  1. #1
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    what's the type of stdin?

    I am trying to make a rw version of popen (by returning a pair of pipes), but I am having trouble dup2'ing stdin to an end of a pipe.

    Code:
    dup2(wpipe[0], stdin);
    Gives
    Code:
    test.c:18: warning: passing argument 2 of ‘dup2’ makes integer from pointer without a cast
    How do I turn it into a file descriptor then? and what exactly is it?

    [edit]
    and
    Code:
    dup2(wpipe[0], *stdin);
    gives
    test.c:18: error: incompatible type for argument 2 of ‘dup2’
    Last edited by cyberfish; 04-23-2009 at 08:56 PM.

  2. #2
    Captain Crash brewbuck's Avatar
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    fileno(stdin)

    EDIT: But stdin is file descriptor 0, by definition.
    Code:
    //try
    //{
    	if (a) do { f( b); } while(1);
    	else   do { f(!b); } while(1);
    //}

  3. #3
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    I see. Thanks.

  4. #4
    Captain Crash brewbuck's Avatar
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    Quote Originally Posted by cyberfish View Post
    I see. Thanks.
    As far as what type stdin is, it's equivalent to a FILE *.
    Code:
    //try
    //{
    	if (a) do { f( b); } while(1);
    	else   do { f(!b); } while(1);
    //}

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