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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>
64 lines
1.6 KiB
C
64 lines
1.6 KiB
C
#ifndef foocredshfoo
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#define foocredshfoo
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/***
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This file is part of PulseAudio.
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Copyright 2006 Lennart Poettering
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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
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published by the Free Software Foundation; either version 2.1 of the
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License, 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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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with PulseAudio; if not, see <http://www.gnu.org/licenses/>.
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***/
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#include <sys/types.h>
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#ifndef PACKAGE
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#error "Please include config.h before including this file!"
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#endif
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#include <pulsecore/socket.h>
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#include <stdbool.h>
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#define MAX_ANCIL_DATA_FDS 2
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typedef struct pa_creds pa_creds;
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typedef struct pa_cmsg_ancil_data pa_cmsg_ancil_data;
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#if defined(SCM_CREDENTIALS)
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#define HAVE_CREDS 1
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struct pa_creds {
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gid_t gid;
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uid_t uid;
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};
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/* Struct for handling ancillary data, i e, extra data that can be sent together with a message
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* over unix pipes. Supports sending and receiving credentials and file descriptors. */
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struct pa_cmsg_ancil_data {
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pa_creds creds;
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bool creds_valid;
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int nfd;
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/* Don't close these fds by your own. Check pa_cmsg_ancil_data_close_fds() */
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int fds[MAX_ANCIL_DATA_FDS];
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bool close_fds_on_cleanup;
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};
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void pa_cmsg_ancil_data_close_fds(struct pa_cmsg_ancil_data *ancil);
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#else
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#undef HAVE_CREDS
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#endif
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#endif
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