/* fpathconf -- adjusted for busybox 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, see <http://www.gnu.org/licenses/>. */ #include <errno.h> #include <unistd.h> #include <limits.h> #include <stddef.h> #include <fcntl.h> #include <sys/stat.h> #include <sys/statfs.h> #ifndef __USE_FILE_OFFSET64 extern int fstatfs (int __fildes, struct statfs *__buf) __THROW __nonnull ((2)); #else # ifdef __REDIRECT_NTH extern int __REDIRECT_NTH (fstatfs, (int __fildes, struct statfs *__buf), fstatfs64) __nonnull ((2)); # else # define fstatfs fstatfs64 # endif #endif extern __typeof(fstatfs) __libc_fstatfs; /* The Linux kernel headers mention this as a kind of generic value. */ #define LINUX_LINK_MAX 127 /* Get file-specific information about descriptor FD. */ long int fpathconf(int fd, int name) { if (fd < 0) { __set_errno (EBADF); return -1; } if (name == _PC_LINK_MAX) { /* Cut some corners */ #if 0 struct statfs fsbuf; /* Determine the filesystem type. */ if (__libc_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; } #else return LINUX_LINK_MAX; #endif } switch (name) { default: __set_errno (EINVAL); return -1; 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 (__libc_fstatfs (fd, &buf) < 0) { if (errno == ENOSYS) { errno = save_errno; return NAME_MAX; } 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: #if defined _POSIX_ASYNC_IO && defined __UCLIBC_HAS_LFS__ { /* AIO is only allowed on regular files and block devices. */ struct stat st; if (fstat (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 /* Be lazy -- skip these */ case _PC_REC_INCR_XFER_SIZE: case _PC_REC_MAX_XFER_SIZE: case _PC_REC_MIN_XFER_SIZE: case _PC_REC_XFER_ALIGN: case _PC_ALLOC_SIZE_MIN: case _PC_SYMLINK_MAX: return -1; } }