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author | arpi <arpi@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2003-02-09 20:18:23 +0000 |
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committer | arpi <arpi@b3059339-0415-0410-9bf9-f77b7e298cf2> | 2003-02-09 20:18:23 +0000 |
commit | 7ff83a71810233276517bc497e93ac15267bc830 (patch) | |
tree | 23e697fbbe48eae893b8c28c383199bc6ca000ad /osdep/shmem.c | |
parent | c98692a0bf56e79781ae7ca2a1e358f518838dac (diff) | |
download | mpv-7ff83a71810233276517bc497e93ac15267bc830.tar.bz2 mpv-7ff83a71810233276517bc497e93ac15267bc830.tar.xz |
linux->osdep
git-svn-id: svn://svn.mplayerhq.hu/mplayer/trunk@9381 b3059339-0415-0410-9bf9-f77b7e298cf2
Diffstat (limited to 'osdep/shmem.c')
-rw-r--r-- | osdep/shmem.c | 107 |
1 files changed, 107 insertions, 0 deletions
diff --git a/osdep/shmem.c b/osdep/shmem.c new file mode 100644 index 0000000000..9fd6047b54 --- /dev/null +++ b/osdep/shmem.c @@ -0,0 +1,107 @@ +/* + * shmem.c - Shared memory allocation + * + * based on mpg123's xfermem.c by + * Oliver Fromme <oliver.fromme@heim3.tu-clausthal.de> + * Sun Apr 6 02:26:26 MET DST 1997 + */ + +#include "../config.h" + +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <errno.h> +#include <sys/types.h> +#include <sys/time.h> +#include <sys/uio.h> +#ifdef HAVE_SYS_MMAN_H +#include <sys/mman.h> +#endif +#include <sys/socket.h> +#include <fcntl.h> + +#include "../mp_msg.h" + +#ifdef AIX +#include <sys/select.h> +#endif + +#ifdef HAVE_SHM +#include <sys/ipc.h> +#include <sys/shm.h> +#endif + +#if defined(MAP_ANONYMOUS) && !defined(MAP_ANON) +#define MAP_ANON MAP_ANONYMOUS +#endif + +static int shmem_type=0; + +void* shmem_alloc(int size){ +void* p; +static int devzero = -1; +while(1){ + switch(shmem_type){ + case 0: // ========= MAP_ANON|MAP_SHARED ========== +#ifdef MAP_ANON + p=mmap(0,size,PROT_READ|PROT_WRITE,MAP_ANON|MAP_SHARED,-1,0); + if(p==MAP_FAILED) break; // failed + mp_dbg(MSGT_OSDEP, MSGL_DBG2, "shmem: %d bytes allocated using mmap anon (%p)\n",size,p); + return p; +#else +// system does not support MAP_ANON at all (e.g. solaris 2.5.1/2.6), just fail + mp_dbg(MSGT_OSDEP, MSGL_DBG3, "shmem: using mmap anon failed\n"); +#endif + break; + case 1: // ========= MAP_SHARED + /dev/zero ========== + if (devzero == -1 && (devzero = open("/dev/zero", O_RDWR, 0)) == -1) break; + p=mmap(0,size,PROT_READ|PROT_WRITE,MAP_SHARED,devzero,0); + if(p==MAP_FAILED) break; // failed + mp_dbg(MSGT_OSDEP, MSGL_DBG2, "shmem: %d bytes allocated using mmap /dev/zero (%p)\n",size,p); + return p; + case 2: { // ========= shmget() ========== +#ifdef HAVE_SHM + struct shmid_ds shmemds; + int shmemid; + if ((shmemid = shmget(IPC_PRIVATE, size, IPC_CREAT | 0600)) == -1) break; + if ((p = shmat(shmemid, 0, 0)) == (void *)-1){ + mp_msg(MSGT_OSDEP, MSGL_ERR, "shmem: shmat() failed: %s\n", strerror(errno)); + shmctl (shmemid, IPC_RMID, &shmemds); + break; + } + if (shmctl(shmemid, IPC_RMID, &shmemds) == -1) { + mp_msg(MSGT_OSDEP, MSGL_ERR, "shmem: shmctl() failed: %s\n", strerror(errno)); + if (shmdt(p) == -1) perror ("shmdt()"); + break; + } + mp_dbg(MSGT_OSDEP, MSGL_DBG2, "shmem: %d bytes allocated using SHM (%p)\n",size,p); + return p; +#else + mp_msg(MSGT_OSDEP, MSGL_FATAL, "shmem: no SHM support was compiled in!\n"); + return(NULL); +#endif + } + default: + mp_msg(MSGT_OSDEP, MSGL_FATAL, + "FATAL: Cannot allocate %d bytes of shared memory :(\n",size); + return NULL; + } + ++shmem_type; +} +} + +void shmem_free(void* p){ + switch(shmem_type){ + case 2: +#ifdef HAVE_SHM + if (shmdt(p) == -1) + mp_msg(MSGT_OSDEP, MSGL_ERR, "shmfree: shmdt() failed: %s\n", + strerror(errno)); +#else + mp_msg(MSGT_OSDEP, MSGL_ERR, "shmfree: no SHM support was compiled in!\n"); +#endif + break; + } +} |