| //===-- Linux implementation of pwrite ------------------------------------===// |
| // |
| // 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 |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #include "src/unistd/pwrite.h" |
| |
| #include "src/__support/OSUtil/syscall.h" // For internal syscall function. |
| #include "src/__support/common.h" |
| |
| #include "src/errno/libc_errno.h" |
| #include <stdint.h> // For uint64_t. |
| #include <sys/syscall.h> // For syscall numbers. |
| |
| namespace LIBC_NAMESPACE { |
| |
| LLVM_LIBC_FUNCTION(ssize_t, pwrite, |
| (int fd, const void *buf, size_t count, off_t offset)) { |
| #ifdef LIBC_TARGET_ARCH_IS_RISCV32 |
| static_assert(sizeof(off_t) == 8); |
| ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>( |
| SYS_pwrite64, fd, buf, count, (long)offset, |
| (long)(((uint64_t)(offset)) >> 32)); |
| #else |
| ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_pwrite64, fd, buf, |
| count, offset); |
| #endif |
| if (ret < 0) { |
| libc_errno = static_cast<int>(-ret); |
| return -1; |
| } |
| return ret; |
| } |
| |
| } // namespace LIBC_NAMESPACE |