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PODoes printf always flush the buffer on encountering a newline?
 

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    <p>My machine is running ubuntu 10.10, and I'm using the standard gnu C library. I was under the impression that printf flushed the buffer if there was a newline described in the format string, however the following code repeatedly seemed to buck that trend. Could someone clarify why the buffer is not being flushed.</p> <pre><code>#include &lt;stdio.h&gt; #include &lt;unistd.h&gt; #include &lt;fcntl.h&gt; #include &lt;sys/wait.h&gt; int main() { int rc; close(1); close(2); printf("HI 1\n"); fprintf(stderr, "ERROR\n"); open("newfile.txt", O_WRONLY | O_CREAT | O_TRUNC, 0600); printf("WHAT?\n"); fprintf(stderr, "I SAID ERROR\n"); rc = fork(); if (rc == 0) { printf("SAY AGAIN?\n"); fprintf(stderr, "ERROR ERROR\n"); } else { wait(NULL); } printf("BYE\n"); fprintf(stderr, "HI 2\n"); return 0; } </code></pre> <p>The contents of newfile.txt after running this program is as follows.</p> <pre><code>HI 1 WHAT? SAY AGAIN? BYE HI 1 WHAT? BYE </code></pre>
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