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    SubjectRe: the different effect of system call fork()
    On Wed, Apr 08, 2009 at 03:08:48PM +0200, Bernd Petrovitsch wrote:
    > > if (pid_t pid = fork() < 0)
    >
    > I don't think that this line does what you want it to do.
    > Hint: Using a "pid_t" for the boolean result for a comparison seems
    > strange at best.

    The "problem" is due to a misunderstanding of C/C++ operator precedence.

    "(pid = fork() < 0)" binds like "pid = (fork() < 0)" and so pid always
    has a value of zero and so both parent and child process run the "first
    level child process" code ... soon there are 4 processes all confused
    about who they are.

    Nick.


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