redirecting stdout

This is a discussion on redirecting stdout within the C Programming forums, part of the General Programming Boards category; I'm trying to redirect stdout in the case of the append operator, ">>". When trying to open the correct file ...

  1. #1
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    redirecting stdout

    I'm trying to redirect stdout in the case of the append operator, ">>". When trying to open the correct file descriptor using the following line I get an error.

    fd[1] = open(output_file, O_WRONLY|O_CREAT|O_APPEND, 0666);

    When I try to compile my program I get these errors:

    'O_WRONLY' undeclared (first use in this function)
    'O_CREAT' undeclared (first use in this function)
    'O_APPEND' undeclared (first use in this function)

    I have included 'unistd.h' and 'fcnt1.h' since I thought those were the two header files I needed in order for the above line of code to work. But I don't really know why those file descriptor flags don't get recognized. Anyone have any suggestions?

  2. #2
    Registered User linuxdude's Avatar
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    you forgot to include this library(or at least mispelled it)
    Code:
           #include <fcntl.h>
    You have fcnt1<-that is a 1(one) not fcntl <-that is an l(el)
    Last edited by linuxdude; 04-21-2004 at 10:34 PM.

  3. #3
    Obsessed with C chrismiceli's Avatar
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    if it helps, fcntl.h stands for FileControl.h.
    Help populate a c/c++ help irc channel
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