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//===-- Linux implementation of pathconf_utils ----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
// This header must go before limits_macros.h otherwise libc header may choose
// to undefine LINK_MAX.
#include <linux/limits.h> // For LINK_MAX and other limits
#include "hdr/limits_macros.h"
#include "hdr/unistd_macros.h"
#include "src/__support/OSUtil/syscall.h" // For internal syscall function.
#include "src/__support/common.h"
#include "src/__support/libc_errno.h"
#include "src/__support/macros/config.h"
#include "src/sys/statvfs/linux/statfs_utils.h"
// other linux specific includes
#include <linux/bfs_fs.h>
#if __has_include(<linux/ufs_fs.h>)
#include <linux/ufs_fs.h>
#else
// from https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/
#define UFS_MAGIC 0x00011954
#endif
#include <linux/magic.h> // For common FS magics
namespace LIBC_NAMESPACE_DECL {
long filesizebits(const statfs_utils::LinuxStatFs &s) {
switch (s.f_type) {
case JFFS2_SUPER_MAGIC:
case MSDOS_SUPER_MAGIC:
case NCP_SUPER_MAGIC:
return 32;
}
return 64;
}
long link_max(const statfs_utils::LinuxStatFs &s) {
switch (s.f_type) {
case EXT2_SUPER_MAGIC:
return 32000;
case MINIX_SUPER_MAGIC:
return 250;
case MINIX2_SUPER_MAGIC:
return 65530;
case REISERFS_SUPER_MAGIC:
return 0xffff - 1000;
case UFS_MAGIC:
return 32000;
}
return LINK_MAX;
}
long symlinks(const statfs_utils::LinuxStatFs &s) {
switch (s.f_type) {
case ADFS_SUPER_MAGIC:
case BFS_MAGIC:
case CRAMFS_MAGIC:
case EFS_SUPER_MAGIC:
case MSDOS_SUPER_MAGIC:
case QNX4_SUPER_MAGIC:
return 0;
}
return 1;
}
long pathconfig(const statfs_utils::LinuxStatFs &s, int name) {
switch (name) {
case _PC_LINK_MAX:
return link_max(s);
case _PC_FILESIZEBITS:
return filesizebits(s);
case _PC_2_SYMLINKS:
return symlinks(s);
case _PC_REC_MIN_XFER_SIZE:
return s.f_bsize;
case _PC_ALLOC_SIZE_MIN:
case _PC_REC_XFER_ALIGN:
return s.f_frsize;
case _PC_MAX_CANON:
return _POSIX_MAX_CANON;
case _PC_MAX_INPUT:
return _POSIX_MAX_INPUT;
case _PC_NAME_MAX:
return s.f_namelen;
case _PC_PATH_MAX:
return _POSIX_PATH_MAX;
case _PC_PIPE_BUF:
return _POSIX_PIPE_BUF;
case _PC_CHOWN_RESTRICTED:
return _POSIX_CHOWN_RESTRICTED;
case _PC_NO_TRUNC:
return _POSIX_NO_TRUNC;
case _PC_VDISABLE:
return _POSIX_VDISABLE;
case _PC_ASYNC_IO:
case _PC_PRIO_IO:
case _PC_REC_INCR_XFER_SIZE:
case _PC_REC_MAX_XFER_SIZE:
case _PC_SYMLINK_MAX:
case _PC_SYNC_IO:
return -1;
default:
libc_errno = EINVAL;
return -1;
}
}
} // namespace LIBC_NAMESPACE_DECL
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