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27d0a3b388
Now that we have the necessary infrastructure to memexport and mempimport a memfd memblock, extend that support higher up in the chain with pstreams. A PA endpoint can now _transparently_ send a memfd memblock to the other end by simply calling pa_pstream_send_memblock() – provided the block's memfd pool was earlier registered with the pstream. If the pipe does not support memfd transfers, we fall back to sending the block's full data instead of just its reference. ** Further details: A single pstream connection usually transfers blocks from multiple pools including the server's srbchannel mempool, the client's audio data mempool, and the server's global core mempool. If these mempools are memfd-backed, we now require registering them with the pstream before sending any blocks they cover. This is done to minimize fd passing overhead and avoid fd leaks. Moreover, to support all these pools without hard-coding their number or nature in the Pulse communication protocol itself, a new REGISTER_MEMFD_SHMID command is introduced. That command can be sent _anytime_ during the pstream's lifetime and is used for creating on demand SHM ID to memfd mappings. Suggested-by: David Henningsson <david.henningsson@canonical.com> Signed-off-by: Ahmed S. Darwish <darwish.07@gmail.com>
145 lines
4.2 KiB
C
145 lines
4.2 KiB
C
/***
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This file is part of PulseAudio.
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Copyright 2014 David Henningsson, Canonical Ltd.
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PulseAudio is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published
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by the Free Software Foundation; either version 2.1 of the License,
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or (at your option) any later version.
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PulseAudio is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
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***/
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#ifdef HAVE_CONFIG_H
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#include <config.h>
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#endif
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#include <unistd.h>
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#include <check.h>
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#include <pulse/mainloop.h>
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#include <pulsecore/packet.h>
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#include <pulsecore/pstream.h>
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#include <pulsecore/iochannel.h>
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#include <pulsecore/memblock.h>
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static unsigned packets_received;
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static unsigned packets_checksum;
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static size_t packets_length;
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static void packet_received(pa_pstream *p, pa_packet *packet, pa_cmsg_ancil_data *ancil_data, void *userdata) {
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const uint8_t *pdata;
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size_t plen;
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unsigned i;
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pdata = pa_packet_data(packet, &plen);
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fail_unless(packets_length == plen);
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packets_received++;
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for (i = 0; i < plen; i++)
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packets_checksum += pdata[i];
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}
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static void packet_test(unsigned npackets, size_t plength, pa_mainloop *ml, pa_pstream *p1, pa_pstream *p2) {
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pa_packet *packet = pa_packet_new(plength);
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unsigned i;
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unsigned psum = 0, totalsum = 0;
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uint8_t *pdata;
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size_t plen;
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pa_log_info("Sending %d packets of length %zd", npackets, plength);
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packets_received = 0;
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packets_checksum = 0;
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packets_length = plength;
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pa_pstream_set_receive_packet_callback(p2, packet_received, NULL);
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pdata = (uint8_t *) pa_packet_data(packet, &plen);
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for (i = 0; i < plen; i++) {
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pdata[i] = i;
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psum += pdata[i];
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}
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for (i = 0; i < npackets; i++) {
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pa_pstream_send_packet(p1, packet, NULL);
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totalsum += psum;
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pa_mainloop_iterate(ml, 0, NULL);
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}
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while (packets_received < npackets)
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pa_mainloop_iterate(ml, 1, NULL);
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fail_unless(packets_checksum == totalsum);
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pa_log_debug("Correct checksum received (%d)", packets_checksum);
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pa_packet_unref(packet);
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}
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START_TEST (srbchannel_test) {
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int pipefd[4];
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pa_mainloop *ml = pa_mainloop_new();
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pa_mempool *mp = pa_mempool_new(PA_MEM_TYPE_SHARED_POSIX, 0, true);
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pa_iochannel *io1, *io2;
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pa_pstream *p1, *p2;
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pa_srbchannel *sr1, *sr2;
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pa_srbchannel_template srt;
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fail_unless(pipe(pipefd) == 0);
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fail_unless(pipe(&pipefd[2]) == 0);
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io1 = pa_iochannel_new(pa_mainloop_get_api(ml), pipefd[2], pipefd[1]);
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io2 = pa_iochannel_new(pa_mainloop_get_api(ml), pipefd[0], pipefd[3]);
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p1 = pa_pstream_new(pa_mainloop_get_api(ml), io1, mp);
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p2 = pa_pstream_new(pa_mainloop_get_api(ml), io2, mp);
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pa_log_debug("Pipes: fd %d -> %d, %d -> %d", pipefd[1], pipefd[0], pipefd[3], pipefd[2]);
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packet_test(250, 5, ml, p1, p2);
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packet_test(10, 1234567, ml, p1, p2);
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pa_log_debug("And now the same thing with srbchannel...");
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sr1 = pa_srbchannel_new(pa_mainloop_get_api(ml), mp);
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pa_srbchannel_export(sr1, &srt);
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pa_pstream_set_srbchannel(p1, sr1);
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sr2 = pa_srbchannel_new_from_template(pa_mainloop_get_api(ml), &srt);
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pa_pstream_set_srbchannel(p2, sr2);
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packet_test(250, 5, ml, p1, p2);
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packet_test(10, 1234567, ml, p1, p2);
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pa_pstream_unref(p1);
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pa_pstream_unref(p2);
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pa_mempool_unref(mp);
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pa_mainloop_free(ml);
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}
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END_TEST
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int main(int argc, char *argv[]) {
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int failed = 0;
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Suite *s;
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TCase *tc;
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SRunner *sr;
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if (!getenv("MAKE_CHECK"))
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pa_log_set_level(PA_LOG_DEBUG);
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s = suite_create("srbchannel");
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tc = tcase_create("srbchannel");
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tcase_add_test(tc, srbchannel_test);
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suite_add_tcase(s, tc);
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sr = srunner_create(s);
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srunner_run_all(sr, CK_NORMAL);
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failed = srunner_ntests_failed(sr);
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srunner_free(sr);
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return (failed == 0) ? EXIT_SUCCESS : EXIT_FAILURE;
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}
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