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example usage:
#include <unistd.h>
#include "popen3.h"
int pipes[3];
pid_t pid;
int ret;
const char *cmd = "cat -n";
pid = popen3(cmd, pipes);
/*
* - write to pipes[0] will go to stdin of cat
* - read from pipes[1] to get stdout of cat
* - read from pipes[2] to get stderr of ct
*/
ret = pclose3(pid, pipes);
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