C++ friendly execvp() wrapper

exec.cpp

#include <algorithm>
#include <string>
#include <vector>

#include <sys/types.h>
#include <sys/wait.h>
#include <unistd.h>

using namespace std;

void child_run(const vector<string>& cmd) {
    const char** args = new const char*[cmd.size() + 1];
    transform(cmd.begin(), cmd.end(), args, [](const string& arg) {
        return arg.c_str();
    });
    args[cmd.size()] = nullptr;
    execvp(args[0], const_cast<char**>(args));
}

int run(const vector<string>& cmd) {
    auto pid = fork();
    if (pid == -1) {
        return -1;
    }
    if (pid) {
        int wstatus;
        waitpid(pid, &wstatus, 0);
        return WEXITSTATUS(wstatus);
    } else {
        child_run(cmd);
        return -1;
    }
}

int main(int argc, char** argv) {
    return run({"ls", "/"});
}