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<title>fork function</title>
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<h1>fork function </h1>
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<b>fork</b> spawns a copy of the running process. The copy (or child)
has a copy of the parent process stack, data area and heap and starts
execution after the fork statement. fork is of use when you wish to
write daemon processes.
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Library: unistd.h
Prototype: pid_t fork(void);
Syntax: pid_t PID
PID = fork();
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On completion, PID will have one of the following values:
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> 0 == the childs process ID.
0 == is returned to the child process.
< 0 == an error occoured. No child created, errno is set to
indicate the problem
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<h2>Examples:</h2>
<img src="../../GRAPHICS/computer.gif"><a href="../EXAMPLES/fork1.c"> example</a>
program.
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<h2>See Also:</h2>
<img src="../../GRAPHICS/whiteball.gif">
<a href="pipe.html">pipe function.</a><p>
<img src="../../GRAPHICS/whiteball.gif">
<a href="execl.html">execl function.</a><p>
<img src="../../GRAPHICS/whiteball.gif">
<a href="../glossary.html#threads">threads</a><p>
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<address>Martin Leslie
</address><p>
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