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<title>pipe function</title>
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<h1>pipe function </h1>
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<p>
<b>pipe</b> creates two file descriptors which can be used by
parent and child processes to communicate data. A child process can
be created with the <a href="fork.html">fork</a> function.
<p>
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<pre>
Library: unistd.h
Prototype: int pipe(int fd[2]);
Syntax: int fd[2];
pipe(fd);
</pre>
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On error, pipe returns -1.<p>
Once the pipe has been executed, the data can be transfered
using <a href=read.html>read</a> and
<a href=write.html>write</a>.
<hr>
<h2>Notes:</h2>
Make sure that when you <a href=read.html>read</a>
exactly the same number of bytes that are
<a href=write.html>written</a>! I spend HOURS
trying to figure out why I was loosing data because of this feature!!
<hr>
<h2>Examples:</h2>
<img src=../../GRAPHICS/computer.gif>
<a href="../EXAMPLES/pipe1.c"> read and write fixed length records.</a>
<p>
<img src=../../GRAPHICS/computer.gif>
<a href="../EXAMPLES/pipe2.c"> read and write variable length records.</a>
<hr>
<h2>See Also:</h2>
<img src=../../GRAPHICS/whiteball.gif>
<a href="fork.html">fork</a> <p>
<img src=../../GRAPHICS/whiteball.gif>
<a href="popen.html">popen</a> function.<p>
<img src=../../GRAPHICS/whiteball.gif>
<a href="pclose.html">pclose</a> function.<p>
<img src=../../GRAPHICS/whiteball.gif>
<a href="read.html">read</a> function.<p>
<img src=../../GRAPHICS/whiteball.gif>
<a href="write.html">write</a> function.<p>
<p>
<hr>
<p>
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<a href="../cref.html"> Top</a>
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<a href="../master_index.html"> Master Index</a>
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<a href="../SYNTAX/keywords.html"> Keywords</a>
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<a href="funcref.htm"> Functions</a>
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<p>
<hr>
<address>Martin Leslie
</address><p>
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