mirror of
https://github.com/autc04/Retro68.git
synced 2024-11-28 21:49:33 +00:00
304 lines
6.0 KiB
C
304 lines
6.0 KiB
C
/* Linux specific extensions to fpathconf.
|
|
Copyright (C) 1991,95,96,98,99,2000,2001 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
The GNU C Library is free software; you can redistribute it and/or
|
|
modify it under the terms of the GNU Lesser General Public
|
|
License as published by the Free Software Foundation; either
|
|
version 2.1 of the License, or (at your option) any later version.
|
|
|
|
The GNU C Library is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser General Public
|
|
License along with the GNU C Library; if not, write to the Free
|
|
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 USA. */
|
|
|
|
/* Modified for newlib July 19, 2002 by Jeff Johnston */
|
|
|
|
#include <errno.h>
|
|
#include <stddef.h>
|
|
#include <unistd.h>
|
|
#include <limits.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/statfs.h>
|
|
#include <sys/statvfs.h>
|
|
#include <machine/weakalias.h>
|
|
#include "linux_fsinfo.h"
|
|
|
|
/* The Linux kernel header mentioned this as a kind of generic value. */
|
|
#define LINUX_LINK_MAX 127
|
|
|
|
static long int posix_fpathconf (int fd, int name);
|
|
|
|
/* Get file-specific information about descriptor FD. */
|
|
long int
|
|
__fpathconf (fd, name)
|
|
int fd;
|
|
int name;
|
|
{
|
|
if (name == _PC_LINK_MAX)
|
|
{
|
|
struct statfs fsbuf;
|
|
|
|
/* Determine the filesystem type. */
|
|
if (__fstatfs (fd, &fsbuf) < 0)
|
|
{
|
|
if (errno == ENOSYS)
|
|
/* not possible, return the default value. */
|
|
return LINUX_LINK_MAX;
|
|
|
|
/* Some error occured. */
|
|
return -1;
|
|
}
|
|
|
|
switch (fsbuf.f_type)
|
|
{
|
|
case EXT2_SUPER_MAGIC:
|
|
return EXT2_LINK_MAX;
|
|
|
|
case MINIX_SUPER_MAGIC:
|
|
case MINIX_SUPER_MAGIC2:
|
|
return MINIX_LINK_MAX;
|
|
|
|
case MINIX2_SUPER_MAGIC:
|
|
case MINIX2_SUPER_MAGIC2:
|
|
return MINIX2_LINK_MAX;
|
|
|
|
case XENIX_SUPER_MAGIC:
|
|
return XENIX_LINK_MAX;
|
|
|
|
case SYSV4_SUPER_MAGIC:
|
|
case SYSV2_SUPER_MAGIC:
|
|
return SYSV_LINK_MAX;
|
|
|
|
case COH_SUPER_MAGIC:
|
|
return COH_LINK_MAX;
|
|
|
|
case UFS_MAGIC:
|
|
case UFS_CIGAM:
|
|
return UFS_LINK_MAX;
|
|
|
|
case REISERFS_SUPER_MAGIC:
|
|
return REISERFS_LINK_MAX;
|
|
|
|
default:
|
|
return LINUX_LINK_MAX;
|
|
}
|
|
}
|
|
|
|
return posix_fpathconf (fd, name);
|
|
}
|
|
|
|
/* Get file-specific information about descriptor FD. */
|
|
static long int
|
|
posix_fpathconf (fd, name)
|
|
int fd;
|
|
int name;
|
|
{
|
|
if (fd < 0)
|
|
{
|
|
__set_errno (EBADF);
|
|
return -1;
|
|
}
|
|
|
|
switch (name)
|
|
{
|
|
default:
|
|
__set_errno (EINVAL);
|
|
return -1;
|
|
|
|
case _PC_LINK_MAX:
|
|
#ifdef LINK_MAX
|
|
return LINK_MAX;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
|
|
case _PC_MAX_CANON:
|
|
#ifdef MAX_CANON
|
|
return MAX_CANON;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
|
|
case _PC_MAX_INPUT:
|
|
#ifdef MAX_INPUT
|
|
return MAX_INPUT;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
|
|
case _PC_NAME_MAX:
|
|
#ifdef NAME_MAX
|
|
{
|
|
struct statfs buf;
|
|
int save_errno = errno;
|
|
|
|
if (__fstatfs (fd, &buf) < 0)
|
|
{
|
|
if (errno == ENOSYS)
|
|
{
|
|
__set_errno (save_errno);
|
|
return NAME_MAX;
|
|
}
|
|
else if (errno == ENODEV)
|
|
__set_errno (EINVAL);
|
|
|
|
return -1;
|
|
}
|
|
else
|
|
{
|
|
#ifdef _STATFS_F_NAMELEN
|
|
return buf.f_namelen;
|
|
#else
|
|
# ifdef _STATFS_F_NAME_MAX
|
|
return buf.f_name_max;
|
|
# else
|
|
return NAME_MAX;
|
|
# endif
|
|
#endif
|
|
}
|
|
}
|
|
#else
|
|
return -1;
|
|
#endif
|
|
|
|
case _PC_PATH_MAX:
|
|
#ifdef PATH_MAX
|
|
return PATH_MAX;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
|
|
case _PC_PIPE_BUF:
|
|
#ifdef PIPE_BUF
|
|
return PIPE_BUF;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
|
|
case _PC_CHOWN_RESTRICTED:
|
|
#ifdef _POSIX_CHOWN_RESTRICTED
|
|
return _POSIX_CHOWN_RESTRICTED;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
|
|
case _PC_NO_TRUNC:
|
|
#ifdef _POSIX_NO_TRUNC
|
|
return _POSIX_NO_TRUNC;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
|
|
case _PC_VDISABLE:
|
|
#ifdef _POSIX_VDISABLE
|
|
return _POSIX_VDISABLE;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
|
|
case _PC_SYNC_IO:
|
|
#ifdef _POSIX_SYNC_IO
|
|
return _POSIX_SYNC_IO;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
|
|
case _PC_ASYNC_IO:
|
|
#ifdef _POSIX_ASYNC_IO
|
|
{
|
|
/* AIO is only allowed on regular files and block devices. */
|
|
struct stat64 st;
|
|
|
|
if (fstat64 (fd, &st) < 0
|
|
|| (! S_ISREG (st.st_mode) && ! S_ISBLK (st.st_mode)))
|
|
return -1;
|
|
else
|
|
return 1;
|
|
}
|
|
#else
|
|
return -1;
|
|
#endif
|
|
|
|
case _PC_PRIO_IO:
|
|
#ifdef _POSIX_PRIO_IO
|
|
return _POSIX_PRIO_IO;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
|
|
case _PC_SOCK_MAXBUF:
|
|
#ifdef SOCK_MAXBUF
|
|
return SOCK_MAXBUF;
|
|
#else
|
|
return -1;
|
|
#endif
|
|
|
|
case _PC_FILESIZEBITS:
|
|
#ifdef FILESIZEBITS
|
|
return FILESIZEBITS;
|
|
#else
|
|
/* We let platforms with larger file sizes overwrite this value. */
|
|
return 32;
|
|
#endif
|
|
|
|
case _PC_REC_INCR_XFER_SIZE:
|
|
/* XXX It is not entirely clear what the limit is supposed to do.
|
|
What is incremented? */
|
|
return -1;
|
|
|
|
case _PC_REC_MAX_XFER_SIZE:
|
|
/* XXX It is not entirely clear what the limit is supposed to do.
|
|
In general there is no top limit of the number of bytes which
|
|
case be transported at once. */
|
|
return -1;
|
|
|
|
case _PC_REC_MIN_XFER_SIZE:
|
|
{
|
|
/* XXX It is not entirely clear what the limit is supposed to do.
|
|
I assume this is the block size of the filesystem. */
|
|
struct statvfs64 sv;
|
|
|
|
if (__fstatvfs64 (fd, &sv) < 0)
|
|
return -1;
|
|
return sv.f_bsize;
|
|
}
|
|
|
|
case _PC_REC_XFER_ALIGN:
|
|
{
|
|
/* XXX It is not entirely clear what the limit is supposed to do.
|
|
I assume that the number should reflect the minimal block
|
|
alignment. */
|
|
struct statvfs64 sv;
|
|
|
|
if (__fstatvfs64 (fd, &sv) < 0)
|
|
return -1;
|
|
return sv.f_frsize;
|
|
}
|
|
|
|
case _PC_ALLOC_SIZE_MIN:
|
|
{
|
|
/* XXX It is not entirely clear what the limit is supposed to do.
|
|
I assume that the number should reflect the minimal block
|
|
alignment. */
|
|
struct statvfs64 sv;
|
|
|
|
if (__fstatvfs64 (fd, &sv) < 0)
|
|
return -1;
|
|
return sv.f_frsize;
|
|
}
|
|
|
|
case _PC_SYMLINK_MAX:
|
|
/* In general there are no limits. If a system has one it should
|
|
overwrite this case. */
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
weak_alias (__fpathconf, fpathconf)
|