mirror of
https://github.com/mpv-player/mpv
synced 2024-12-24 15:52:25 +00:00
4873b32c59
Finish renaming directories and moving files. Adjust all include
statements to make the previous commit compile.
The two commits are separate, because git is bad at tracking renames
and content changes at the same time.
Also take this as an opportunity to remove the separation between
"common" and "mplayer" sources in the Makefile. ("common" used to be
shared between mplayer and mencoder.)
138 lines
3.9 KiB
C
138 lines
3.9 KiB
C
/*
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* shared memory allocation
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*
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* based on mpg123's xfermem.c by
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* Oliver Fromme <oliver.fromme@heim3.tu-clausthal.de>
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*
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* This file is part of MPlayer.
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*
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* MPlayer is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* MPlayer is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with MPlayer; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/uio.h>
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#ifdef HAVE_SYS_MMAN_H
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#include <sys/mman.h>
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#endif
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#include <sys/socket.h>
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#include <fcntl.h>
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#include <inttypes.h>
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#include "core/mp_msg.h"
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#ifdef AIX
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#include <sys/select.h>
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#endif
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#ifdef HAVE_SHM
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#include <sys/ipc.h>
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#include <sys/shm.h>
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#endif
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#include "shmem.h"
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#if defined(MAP_ANONYMOUS) && !defined(MAP_ANON)
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#define MAP_ANON MAP_ANONYMOUS
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#endif
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static int shmem_type=0;
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void* shmem_alloc(int64_t size){
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void* p;
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static int devzero = -1;
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if (size > SIZE_MAX) {
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mp_msg(MSGT_OSDEP, MSGL_FATAL,
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"Shared memory allocation larger than system max. allocation size.\n");
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return NULL;
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}
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while(1){
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switch(shmem_type){
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case 0: // ========= MAP_ANON|MAP_SHARED ==========
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#ifdef MAP_ANON
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p=mmap(0,size,PROT_READ|PROT_WRITE,MAP_ANON|MAP_SHARED,-1,0);
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if(p==MAP_FAILED) break; // failed
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mp_dbg(MSGT_OSDEP, MSGL_DBG2, "shmem: %"PRId64" bytes allocated using mmap anon (%p)\n",size,p);
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return p;
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#else
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// system does not support MAP_ANON at all (e.g. solaris 2.5.1/2.6), just fail
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mp_dbg(MSGT_OSDEP, MSGL_DBG3, "shmem: using mmap anon failed\n");
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#endif
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break;
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case 1: // ========= MAP_SHARED + /dev/zero ==========
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if (devzero == -1 && (devzero = open("/dev/zero", O_RDWR, 0)) == -1) break;
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p=mmap(0,size,PROT_READ|PROT_WRITE,MAP_SHARED,devzero,0);
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if(p==MAP_FAILED) break; // failed
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mp_dbg(MSGT_OSDEP, MSGL_DBG2, "shmem: %"PRId64" bytes allocated using mmap /dev/zero (%p)\n",size,p);
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return p;
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case 2: { // ========= shmget() ==========
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#ifdef HAVE_SHM
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struct shmid_ds shmemds;
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int shmemid;
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if ((shmemid = shmget(IPC_PRIVATE, size, IPC_CREAT | 0600)) == -1) break;
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if ((p = shmat(shmemid, 0, 0)) == (void *)-1){
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mp_msg(MSGT_OSDEP, MSGL_ERR, "shmem: shmat() failed: %s\n", strerror(errno));
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shmctl (shmemid, IPC_RMID, &shmemds);
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break;
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}
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if (shmctl(shmemid, IPC_RMID, &shmemds) == -1) {
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mp_msg(MSGT_OSDEP, MSGL_ERR, "shmem: shmctl() failed: %s\n", strerror(errno));
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if (shmdt(p) == -1) perror ("shmdt()");
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break;
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}
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mp_dbg(MSGT_OSDEP, MSGL_DBG2, "shmem: %"PRId64" bytes allocated using SHM (%p)\n",size,p);
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return p;
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#else
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mp_msg(MSGT_OSDEP, MSGL_FATAL, "shmem: no SHM support was compiled in!\n");
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return NULL;
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#endif
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}
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default:
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mp_msg(MSGT_OSDEP, MSGL_FATAL,
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"FATAL: Cannot allocate %"PRId64" bytes of shared memory :(\n",size);
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return NULL;
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}
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++shmem_type;
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}
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}
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void shmem_free(void* p,int64_t size){
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switch(shmem_type){
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case 0:
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case 1:
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if(munmap(p,size)) {
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mp_msg(MSGT_OSDEP, MSGL_ERR, "munmap failed on %p %"PRId64" bytes: %s\n",
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p,size,strerror(errno));
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}
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break;
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case 2:
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#ifdef HAVE_SHM
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if (shmdt(p) == -1)
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mp_msg(MSGT_OSDEP, MSGL_ERR, "shmfree: shmdt() failed: %s\n",
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strerror(errno));
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#else
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mp_msg(MSGT_OSDEP, MSGL_ERR, "shmfree: no SHM support was compiled in!\n");
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#endif
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break;
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}
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}
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