Question on using /tmp

From: Shi Jin (jinzishuai_at_hotmail.com)
Date: 06/20/05

  • Next message: Floyd L. Davidson: "Re: Question on using /tmp" 
    Date: Sun, 19 Jun 2005 23:39:18 -0400

    Hi there,

    In my C code, I need to make a system call to a command to generate a
    temporary file and my code is going to read something out of it.
    I cannot use the pipes to redirect the output to stdout since it varies
    from machine to machine. Only when I call the command in the form
    tsm -Loutput.file
    The command "tsm" will give me a well formated file output.file.

    I want to make output.file a temporary file so that I can use the function
    tmpnam or tmpfile.
    I guess using tmpfile is better in the sense it generates a unique
    filename in the same time creates the file. But I have to use tmpnam since
    I need to create the file in another way. Now my code looks like
    filename=tmpnam(tmpname);
    system(command);
    fp=fopen(filename,"r");

    When I compile it, I get the following warnings:
    warning: the use of `tmpnam' is dangerous, better use `mkstemp'

    For the same reason above, I cannot use mkstemp either. I could use mktemp
    which makes to difference to me compared to tmpnam.

    But still, as the warning said, there is some danger in using tmpnam
    although it seldom happens.
    I wonder if there is a perfect solution to this.
    Thank you very much

    Shi

  • Next message: Floyd L. Davidson: "Re: Question on using /tmp"

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