Pipe Linux command results

pipe.cpp

#include <stdexcept>
#include <string>
#include <cstdio>

std::string exec(const char *cmd)
{
	int bufferSz = 512;
	char buffer[bufferSz];
	std::string result = "";
	FILE *pipe = popen(cmd, "r");
	if (!pipe)
		throw std::runtime_error("popen() failed!");
	try
	{
		while (!feof(pipe))
		{
			if (fgets(buffer, bufferSz, pipe) != NULL)
				result += buffer;
		}
	}
	catch (...)
	{
		pclose(pipe);
		throw;
	}
	pclose(pipe);
	return result;
}