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Update posix_mapping.h #1283

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31 changes: 31 additions & 0 deletions include/fast_io_hosted/platforms/posix_mapping.h
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Original file line number Diff line number Diff line change
Expand Up @@ -11,6 +11,36 @@ namespace details
inline ::std::byte *sys_mmap(void *addr, ::std::size_t len, int prot, int flags, int fd, ::std::uintmax_t offset)
{
#if defined(__linux__) && defined(__NR_mmap) && !defined(__NR_mmap2)
#if defined(__s390__) || defined(__s390x__)
// s390 __NR_mmap is the old single-argument entry; pass the kernel's mmap argument block.
struct s390_mmap_arg_struct
{
unsigned long addr;
unsigned long len;
unsigned long prot;
unsigned long flags;
unsigned long fd;
unsigned long offset;
};

if constexpr (sizeof(::std::uintmax_t) > sizeof(unsigned long))
{
if (offset > static_cast<::std::uintmax_t>(::std::numeric_limits<unsigned long>::max()))
{
throw_posix_error(EINVAL);
}
}
s390_mmap_arg_struct args{
reinterpret_cast<unsigned long>(addr),
static_cast<unsigned long>(len),
static_cast<unsigned long>(prot),
static_cast<unsigned long>(flags),
static_cast<unsigned long>(fd),
static_cast<unsigned long>(offset)};
::std::ptrdiff_t ret{system_call<__NR_mmap, ::std::ptrdiff_t>(__builtin_addressof(args))};
system_call_throw_error(ret);
return reinterpret_cast<::std::byte *>(static_cast<::std::uintptr_t>(ret));
#else
if constexpr (sizeof(::std::uintmax_t) > sizeof(off_t))
{
if (offset > static_cast<::std::uintmax_t>(::std::numeric_limits<off_t>::max()))
Expand All @@ -21,6 +51,7 @@ inline ::std::byte *sys_mmap(void *addr, ::std::size_t len, int prot, int flags,
::std::ptrdiff_t ret{system_call<__NR_mmap, ::std::ptrdiff_t>(addr, len, prot, flags, fd, offset)};
system_call_throw_error(ret);
return reinterpret_cast<::std::byte *>(static_cast<::std::uintptr_t>(ret));
#endif
#elif defined(HAVE_MMAP64)
if constexpr (sizeof(::std::uintmax_t) > sizeof(off64_t))
{
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