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[libc] Fix compilation on 32-bit systems

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This fixes the following compilation error: no known conversion from 'off_t *'
(aka 'long long *') to 'long' for 5th argument.

Since pointers are 32-bit long anyway, casting it to long shouldn't be a
problem. Tested on rv32.

Reviewed By: sivachandra

Differential Revision: https://reviews.llvm.org/D157792
This commit is contained in:
Mikhail R. Gadelha 2023-08-16 09:52:05 -03:00
parent c8eeee2be2
commit ea70e6f9a9
1 changed files with 8 additions and 7 deletions
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15
libc/src/unistd/linux/lseek.cpp
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@ -23,14 +23,15 @@ LLVM_LIBC_FUNCTION(off_t, lseek, (int fd, off_t offset, int whence)) {
#ifdef SYS_lseek
int ret = __llvm_libc::syscall_impl<int>(SYS_lseek, fd, offset, whence);
result = ret;
#elif defined(SYS_llseek)
long ret = __llvm_libc::syscall_impl(SYS_llseek, fd,
(long)(((uint64_t)(offset)) >> 32),
(long)offset, &result, whence);
result = ret;
#elif defined(SYS_llseek) || defined(SYS__llseek)
#ifdef SYS_llseek
constexpr long LLSEEK_SYSCALL_NO = SYS_llseek;
#elif defined(SYS__llseek)
int ret = __llvm_libc::syscall_impl<int>(SYS__llseek, fd, offset >> 32,
offset, &result, whence);
constexpr long LLSEEK_SYSCALL_NO = SYS__llseek;
#endif
uint64_t offset_64 = static_cast<uint64_t>(offset);
int ret = __llvm_libc::syscall_impl<int>(
LLSEEK_SYSCALL_NO, fd, offset_64 >> 32, offset_64, &result, whence);
#else
#error "lseek, llseek and _llseek syscalls not available."
#endif