fdarray.c

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// SPDX-License-Identifier: GPL-2.0
#include <api/fd/array.h>
#include <poll.h>
#include "util/debug.h"
#include "tests/tests.h"

static void fdarray__init_revents(struct fdarray *fda, short revents)
{
    int fd;

    fda->nr = fda->nr_alloc;

    for (fd = 0; fd < fda->nr; ++fd) {
        fda->entries[fd].fd  = fda->nr - fd;
        fda->entries[fd].revents = revents;
    }
}

static int fdarray__fprintf_prefix(struct fdarray *fda, const char *prefix, FILE *fp)
{
    int printed = 0;

    if (verbose <= 0)
        return 0;

    printed += fprintf(fp, "\n%s: ", prefix);
    return printed + fdarray__fprintf(fda, fp);
}

int test__fdarray__filter(struct test *test __maybe_unused, int subtest __maybe_unused)
{
    int nr_fds, expected_fd[2], fd, err = TEST_FAIL;
    struct fdarray *fda = fdarray__new(5, 5);

    if (fda == NULL) {
        pr_debug("\nfdarray__new() failed!");
        goto out;
    }

    fdarray__init_revents(fda, POLLIN);
    nr_fds = fdarray__filter(fda, POLLHUP, NULL, NULL);
    if (nr_fds != fda->nr_alloc) {
        pr_debug("\nfdarray__filter()=%d != %d shouldn't have filtered anything",
             nr_fds, fda->nr_alloc);
        goto out_delete;
    }

    fdarray__init_revents(fda, POLLHUP);
    nr_fds = fdarray__filter(fda, POLLHUP, NULL, NULL);
    if (nr_fds != 0) {
        pr_debug("\nfdarray__filter()=%d != %d, should have filtered all fds",
             nr_fds, fda->nr_alloc);
        goto out_delete;
    }

    fdarray__init_revents(fda, POLLHUP);
    fda->entries[2].revents = POLLIN;
    expected_fd[0] = fda->entries[2].fd;

    pr_debug("\nfiltering all but fda->entries[2]:");
    fdarray__fprintf_prefix(fda, "before", stderr);
    nr_fds = fdarray__filter(fda, POLLHUP, NULL, NULL);
    fdarray__fprintf_prefix(fda, " after", stderr);
    if (nr_fds != 1) {
        pr_debug("\nfdarray__filter()=%d != 1, should have left just one event", nr_fds);
        goto out_delete;
    }

    if (fda->entries[0].fd != expected_fd[0]) {
        pr_debug("\nfda->entries[0].fd=%d != %d\n",
             fda->entries[0].fd, expected_fd[0]);
        goto out_delete;
    }

    fdarray__init_revents(fda, POLLHUP);
    fda->entries[0].revents = POLLIN;
    expected_fd[0] = fda->entries[0].fd;
    fda->entries[3].revents = POLLIN;
    expected_fd[1] = fda->entries[3].fd;

    pr_debug("\nfiltering all but (fda->entries[0], fda->entries[3]):");
    fdarray__fprintf_prefix(fda, "before", stderr);
    nr_fds = fdarray__filter(fda, POLLHUP, NULL, NULL);
    fdarray__fprintf_prefix(fda, " after", stderr);
    if (nr_fds != 2) {
        pr_debug("\nfdarray__filter()=%d != 2, should have left just two events",
             nr_fds);
        goto out_delete;
    }

    for (fd = 0; fd < 2; ++fd) {
        if (fda->entries[fd].fd != expected_fd[fd]) {
            pr_debug("\nfda->entries[%d].fd=%d != %d\n", fd,
                 fda->entries[fd].fd, expected_fd[fd]);
            goto out_delete;
        }
    }

    pr_debug("\n");

    err = 0;
out_delete:
    fdarray__delete(fda);
out:
    return err;
}

int test__fdarray__add(struct test *test __maybe_unused, int subtest __maybe_unused)
{
    int err = TEST_FAIL;
    struct fdarray *fda = fdarray__new(2, 2);

    if (fda == NULL) {
        pr_debug("\nfdarray__new() failed!");
        goto out;
    }

#define FDA_CHECK(_idx, _fd, _revents)                     \
    if (fda->entries[_idx].fd != _fd) {                \
        pr_debug("\n%d: fda->entries[%d](%d) != %d!",          \
             __LINE__, _idx, fda->entries[1].fd, _fd);     \
        goto out_delete;                       \
    }                                  \
    if (fda->entries[_idx].events != (_revents)) {             \
        pr_debug("\n%d: fda->entries[%d].revents(%d) != %d!",      \
             __LINE__, _idx, fda->entries[_idx].fd, _revents); \
        goto out_delete;                       \
    }

#define FDA_ADD(_idx, _fd, _revents, _nr)                  \
    if (fdarray__add(fda, _fd, _revents) < 0) {            \
        pr_debug("\n%d: fdarray__add(fda, %d, %d) failed!",    \
             __LINE__,_fd, _revents);              \
        goto out_delete;                       \
    }                                  \
    if (fda->nr != _nr) {                          \
        pr_debug("\n%d: fdarray__add(fda, %d, %d)=%d != %d",       \
             __LINE__,_fd, _revents, fda->nr, _nr);        \
        goto out_delete;                       \
    }                                  \
    FDA_CHECK(_idx, _fd, _revents)

    FDA_ADD(0, 1, POLLIN, 1);
    FDA_ADD(1, 2, POLLERR, 2);

    fdarray__fprintf_prefix(fda, "before growing array", stderr);

    FDA_ADD(2, 35, POLLHUP, 3);

    if (fda->entries == NULL) {
        pr_debug("\nfdarray__add(fda, 35, POLLHUP) should have allocated fda->pollfd!");
        goto out_delete;
    }

    fdarray__fprintf_prefix(fda, "after 3rd add", stderr);

    FDA_ADD(3, 88, POLLIN | POLLOUT, 4);

    fdarray__fprintf_prefix(fda, "after 4th add", stderr);

    FDA_CHECK(0, 1, POLLIN);
    FDA_CHECK(1, 2, POLLERR);
    FDA_CHECK(2, 35, POLLHUP);
    FDA_CHECK(3, 88, POLLIN | POLLOUT);

#undef FDA_ADD
#undef FDA_CHECK

    pr_debug("\n");

    err = 0;
out_delete:
    fdarray__delete(fda);
out:
    return err;
}