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/* fhandler_virtual.cc: base fhandler class for virtual filesystems
This file is part of Cygwin.
This software is a copyrighted work licensed under the terms of the
Cygwin license. Please consult the file "CYGWIN_LICENSE" for
details. */
#include "winsup.h"
#include <cygwin/acl.h>
#include <sys/statvfs.h>
#include "cygerrno.h"
#include "path.h"
#include "fhandler.h"
#include "dtable.h"
#include "cygheap.h"
#include "sync.h"
#include "child_info.h"
#include <dirent.h>
fhandler_virtual::fhandler_virtual ():
fhandler_base (), filebuf (NULL), fileid (-1)
{
}
fhandler_virtual::~fhandler_virtual ()
{
if (filebuf)
{
cfree (filebuf);
filebuf = NULL;
}
}
void
fhandler_virtual::fixup_after_exec ()
{
}
DIR *
fhandler_virtual::opendir (int fd)
{
DIR *dir;
DIR *res = NULL;
size_t len;
if (!virt_ftype_isdir (exists ()))
set_errno (ENOTDIR);
else if ((len = strlen (get_name ())) > PATH_MAX - 3)
set_errno (ENAMETOOLONG);
else if ((dir = (DIR *) malloc (sizeof (DIR))) == NULL)
set_errno (ENOMEM);
else if ((dir->__d_dirname = (char *) malloc (len + 3)) == NULL)
{
free (dir);
set_errno (ENOMEM);
}
else if ((dir->__d_dirent =
(struct dirent *) malloc (sizeof (struct dirent))) == NULL)
{
free (dir->__d_dirname);
free (dir);
set_errno (ENOMEM);
}
else
{
strcpy (dir->__d_dirname, get_name ());
dir->__d_dirent->__d_version = __DIRENT_VERSION;
dir->__d_cookie = __DIRENT_COOKIE;
dir->__handle = INVALID_HANDLE_VALUE;
dir->__d_position = 0;
dir->__flags = 0;
if (fd >= 0)
{
dir->__d_fd = fd;
dir->__fh = this;
res = dir;
}
else
{
cygheap_fdnew cfd;
if (cfd >= 0 && open (O_RDONLY, 0))
{
cfd = this;
dir->__d_fd = cfd;
dir->__fh = this;
res = dir;
}
}
close_on_exec (true);
}
syscall_printf ("%p = opendir (%s)", res, get_name ());
return res;
}
long
fhandler_virtual::telldir (DIR * dir)
{
return dir->__d_position;
}
void
fhandler_virtual::seekdir (DIR * dir, long loc)
{
dir->__flags |= dirent_saw_dot | dirent_saw_dot_dot;
dir->__d_position = loc;
}
void
fhandler_virtual::rewinddir (DIR * dir)
{
dir->__d_position = 0;
dir->__flags |= dirent_saw_dot | dirent_saw_dot_dot;
}
int
fhandler_virtual::closedir (DIR * dir)
{
return 0;
}
off_t
fhandler_virtual::lseek (off_t offset, int whence)
{
/*
* On Linux, when you lseek within a /proc file,
* the contents of the file are updated.
*/
if (!fill_filebuf ())
return (off_t) -1;
switch (whence)
{
case SEEK_SET:
position = offset;
break;
case SEEK_CUR:
position += offset;
break;
case SEEK_END:
position = filesize + offset;
break;
default:
set_errno (EINVAL);
return (off_t) -1;
}
return position;
}
int
fhandler_virtual::dup (fhandler_base * child, int flags)
{
int ret = fhandler_base::dup (child, flags);
if (!ret)
{
fhandler_virtual *fhproc_child = (fhandler_virtual *) child;
fhproc_child->filebuf = (char *) cmalloc_abort (HEAP_BUF, filesize);
memcpy (fhproc_child->filebuf, filebuf, filesize);
}
return ret;
}
int
fhandler_virtual::close ()
{
if (!have_execed)
{
if (filebuf)
{
cfree (filebuf);
filebuf = NULL;
}
}
return 0;
}
void
fhandler_virtual::read (void *ptr, size_t& len)
{
if (len == 0)
return;
if (diropen)
{
set_errno (EISDIR);
len = (size_t) -1;
return;
}
if (!filebuf)
{
len = (size_t) 0;
return;
}
if ((ssize_t) len > filesize - position)
len = (size_t) (filesize - position);
if ((ssize_t) len < 0)
len = 0;
else
memcpy (ptr, filebuf + position, len);
position += len;
}
ssize_t __stdcall
fhandler_virtual::write (const void *ptr, size_t len)
{
set_errno (EACCES);
return -1;
}
/* low-level open for all proc files */
int
fhandler_virtual::open (int flags, mode_t mode)
{
rbinary (true);
wbinary (true);
set_flags ((flags & ~O_TEXT) | O_BINARY);
return 1;
}
virtual_ftype_t
fhandler_virtual::exists ()
{
return virt_none;
}
bool
fhandler_virtual::fill_filebuf ()
{
return true;
}
int
fhandler_virtual::fchmod (mode_t mode)
{
/* Same as on Linux. */
set_errno (EPERM);
return -1;
}
int
fhandler_virtual::fchown (uid_t uid, gid_t gid)
{
/* Same as on Linux. */
set_errno (EPERM);
return -1;
}
int
fhandler_virtual::facl (int cmd, int nentries, aclent_t *aclbufp)
{
int res = fhandler_base::facl (cmd, nentries, aclbufp);
if (res >= 0 && cmd == GETACL)
{
aclbufp[0].a_perm = (S_IRUSR | (pc.isdir () ? S_IXUSR : 0)) >> 6;
aclbufp[1].a_perm = (S_IRGRP | (pc.isdir () ? S_IXGRP : 0)) >> 3;
aclbufp[2].a_perm = S_IROTH | (pc.isdir () ? S_IXOTH : 0);
}
return res;
}
int
fhandler_virtual::fstatvfs (struct statvfs *sfs)
{
/* Virtual file system. Just return an empty buffer with a few values
set to something useful. Just as on Linux. */
memset (sfs, 0, sizeof (*sfs));
sfs->f_bsize = sfs->f_frsize = 4096;
sfs->f_flag = ST_RDONLY;
sfs->f_namemax = NAME_MAX;
return 0;
}
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