Merge "Always prefer poll over select."

#include <errno.h>

#include <grp.h>

#include <poll.h>

#include <pwd.h>

#include <stdint.h>

#include <stdio.h>

#include <vector>

#include <android-base/file.h>

#include <android-base/macros.h>

#include <log/log.h>

uint64_t Nanotime() {

        return 0;

    }

    bool newline = false;

    fd_set read_set;

    timeval tm;

    while (true) {

        FD_ZERO(&read_set);

        FD_SET(fd, &read_set);

        /* Timeout if no data is read for 30 seconds. */

        tm.tv_sec = 30;

        tm.tv_usec = 0;

        uint64_t elapsed = Nanotime();

        int ret = TEMP_FAILURE_RETRY(select(fd + 1, &read_set, nullptr, nullptr, &tm));

        uint64_t start_time = Nanotime();

        pollfd fds[] = { { .fd = fd, .events = POLLIN } };

        int ret = TEMP_FAILURE_RETRY(poll(fds, arraysize(fds), 30 * 1000));

        if (ret == -1) {

            dprintf(out_fd, "*** %s: select failed: %s\n", path, strerror(errno));

            dprintf(out_fd, "*** %s: poll failed: %s\n", path, strerror(errno));

            newline = true;

            break;

        } else if (ret == 0) {

            elapsed = Nanotime() - elapsed;

            uint64_t elapsed = Nanotime() - start_time;

            dprintf(out_fd, "*** %s: Timed out after %.3fs\n", path, (float)elapsed / NANOS_PER_SEC);

            newline = true;

            break;