Skip to content

V
vlc-2-2
Commit 1c0f708a authored by Rémi Denis-Courmont's avatar Rémi Denis-Courmont
Browse files
Options

Remove old mmap support

parent 160ee0af
Show whitespace changes
Inline Side-by-side
Showing with 4 additions and 147 deletions
modules/access/file.c
View file @ 1c0f708a
......@@ -53,9 +53,6 @@
# include <unistd.h>
# include <poll.h>
#endif
#ifdef HAVE_MMAP
# include <sys/mman.h>
#endif
#if defined( WIN32 ) && !defined( UNDER_CE )
# ifdef lseek
......@@ -108,15 +105,11 @@ vlc_module_end();
static int Seek( access_t *, int64_t );
static ssize_t Read( access_t *, uint8_t *, size_t );
static int Control( access_t *, int, va_list );
#ifdef HAVE_MMAP
static block_t *mmapBlock( access_t * );
#endif
static int open_file( access_t *, const char * );
struct access_sys_t
{
uint64_t pagemask;
unsigned int i_nb_reads;
vlc_bool_t b_kfir;
......@@ -198,51 +191,15 @@ static int Open( vlc_object_t *p_this )
#ifdef HAVE_SYS_STAT_H
p_access->info.i_size = st.st_size;
if (!S_ISREG (st.st_mode) && !S_ISBLK (st.st_mode)
&& (!S_ISCHR (st.st_mode) || (st.st_size == 0)))
if (!S_ISREG (st.st_mode)
&& !S_ISBLK (st.st_mode)
&& !S_ISCHR (st.st_mode))
p_sys->b_seekable = VLC_FALSE;
# ifdef HAVE_MMAP
p_sys->pagemask = sysconf (_SC_PAGE_SIZE) - 1;
/* Autodetect mmap() support */
if (p_sys->b_pace_control && S_ISREG (st.st_mode) && (st.st_size > 0))
{
/* TODO: Do not allow PROT_WRITE, we should not need it.
* However, this far, "block" ownership seems such that whoever
* "receives" a block can freely modify its content. Hence we _may_
* need PROT_WRITE not to default memory protection.
* NOTE: With MAP_PRIVATE, changes are not committed to the underlying
* file, write open permission is not required.
*/
void *addr = mmap (NULL, 1, PROT_READ|PROT_WRITE, MAP_PRIVATE, fd, 0);
if (addr != MAP_FAILED)
{
/* Does the file system support mmap? */
munmap (addr, 1);
p_access->pf_read = NULL;
p_access->pf_block = mmapBlock;
msg_Dbg (p_this, "mmap enabled");
}
else
msg_Dbg (p_this, "mmap disabled (%m)");
}
else
msg_Dbg (p_this, "mmap disabled (non regular file)");
# endif
#else
p_sys->b_seekable = !b_stdin;
# warning File size not known!
#endif
if (p_sys->b_seekable && (p_access->info.i_size == 0))
{
/* FIXME that's bad because all others access will be probed */
msg_Err (p_access, "file is empty, aborting");
Close (p_this);
return VLC_EGENERIC;
}
return VLC_SUCCESS;
}
......@@ -349,115 +306,15 @@ static ssize_t Read( access_t *p_access, uint8_t *p_buffer, size_t i_len )
return i_ret;
}
#ifdef HAVE_MMAP
# define MMAP_SIZE (1 << 20)
static block_t *mmapBlock (access_t *p_access)
{
access_sys_t *p_sys = p_access->p_sys;
const int flags = MAP_SHARED;
off_t offset = p_access->info.i_pos & ~p_sys->pagemask;
size_t align = p_access->info.i_pos & p_sys->pagemask;
size_t length = (MMAP_SIZE > p_sys->pagemask) ? MMAP_SIZE : (p_sys->pagemask + 1);
void *addr;
#ifndef NDEBUG
int64_t dbgpos = lseek (p_sys->fd, 0, SEEK_CUR);
if (dbgpos != p_access->info.i_pos)
msg_Err (p_access, "position: 0x%08llx instead of 0x%08llx",
p_access->info.i_pos, dbgpos);
#endif
if (p_access->info.i_pos >= p_access->info.i_size)
{
/* End of file - check if file size changed... */
struct stat st;
if ((fstat (p_sys->fd, &st) == 0)
&& (st.st_size != p_access->info.i_size))
{
p_access->info.i_size = st.st_size;
p_access->info.i_update |= INPUT_UPDATE_SIZE;
}
/* Really at end of file then */
if (p_access->info.i_pos >= p_access->info.i_size)
{
p_access->info.b_eof = VLC_TRUE;
msg_Dbg (p_access, "at end of memory mapped file");
return NULL;
}
}
if (offset + length > p_access->info.i_size)
/* Don't mmap beyond end of file */
length = p_access->info.i_size - offset;
assert (offset <= p_access->info.i_pos); /* and */
assert (p_access->info.i_pos < p_access->info.i_size); /* imply */
assert (offset < p_access->info.i_size); /* imply */
assert (length > 0);
addr = mmap (NULL, length, PROT_READ, flags, p_sys->fd, offset);
if (addr == MAP_FAILED)
{
msg_Err (p_access, "memory mapping failed (%m)");
intf_UserFatal (p_access, VLC_FALSE, _("File reading failed"),
_("VLC could not read the file."));
msleep( INPUT_ERROR_SLEEP );
return NULL;
}
p_access->info.i_pos = offset + length;
block_t *block = block_mmap_Alloc (addr, length);
if (block == NULL)
return NULL;
block->p_buffer += align;
block->i_buffer -= align;
#ifndef NDEBUG
msg_Dbg (p_access, "mapped 0x%lx bytes at %p from offset 0x%lx",
(unsigned long)length, addr, (unsigned long)offset);
/* Compare normal I/O with memory mapping */
char *buf = malloc (block->i_buffer);
ssize_t i_read = read (p_sys->fd, buf, block->i_buffer);
if (i_read != (ssize_t)block->i_buffer)
msg_Err (p_access, "read %u instead of %u bytes", (unsigned)i_read,
(unsigned)block->i_buffer);
if (memcmp (buf, block->p_buffer, block->i_buffer))
msg_Err (p_access, "inconsistent data buffer");
free (buf);
#endif
return block;
}
#endif
/*****************************************************************************
* Seek: seek to a specific location in a file
*****************************************************************************/
static int Seek (access_t *p_access, int64_t i_pos)
{
/* FIXME: i_size should really be unsigned */
if ((uint64_t)i_pos > (uint64_t)p_access->info.i_size)
{
/* This should only happen with corrupted/truncated files. */
msg_Err (p_access, "seeking too far (0x"I64Fx" / 0x"I64Fx")",
i_pos, p_access->info.i_size);
i_pos = p_access->info.i_size;
}
p_access->info.i_pos = i_pos;
p_access->info.b_eof = VLC_FALSE;
#if defined (HAVE_MMAP) && defined (NDEBUG)
if (p_access->pf_block == NULL)
#endif
lseek (p_access->p_sys->fd, i_pos, SEEK_SET);
return VLC_SUCCESS;
}
......
Markdown is supported
0% or
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment