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Full Discussion: Parent forking
Top Forums Programming Parent forking Post 302493420 by Corona688 on Wednesday 2nd of February 2011 04:48:27 PM
Old 02-02-2011
Quote:
Originally Posted by TWhitt24
My question is, how do you fork only the parent processes in unix? For example how would I use the fork function to fork the parent process more than once and leave the children processes alone.
That's what fork()'s return value is for. children will know they are children.
Code:
pid_t pid=fork();

if(pid > 0)
{
        fprintf(stderr, "I am in the parent\n");
}
else if(pid == 0)
{
        fprintf(stderr, "I am the child so should not fork again\n");
}
else
{
        perror("could not fork");
}

 

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ptree(1)						      General Commands Manual							  ptree(1)

NAME
ptree - prints the process tree hierarchy SYNOPSIS
[pid1|username1 [pid2|username2]...] DESCRIPTION
prints the process tree of all processes that match the specified arguments. While printing the tree, the child processes are indented to the right from their respective parent processes. Options Prints the tree starting from the children of (usually pid 0). The default is to print the tree starting from the children of (pid 1). Operands pid Print the process tree for the process ID number specified by pid. username Print the process tree for all the processes from the user specified by username. Note that only username (and not user ID) can be specified for this instance. If no operands are specified, then prints the process tree of all processes starting from the children of or (if is specified). EXTERNAL INFLUENCES
Environment Variables If is not specified or is null, it defaults to (see lang(5)). EXAMPLES
Print the process tree for pid 100 and for all processes owned by WARNINGS
Process information can change while is running; the tree displayed by is only a snapshot in time. Some data printed for defunct processes is irrelevant. Users of must not rely on the exact field widths and spacing of its output, as these will vary depending on the system and the release of HP-UX. SEE ALSO
pgrep(1), pkill(1), ps(1), fork(2). ptree(1)
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