1 //===-- Linux implementation of lseek -------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #include "src/unistd/lseek.h" 10 #include "src/__support/macros/config.h" 11 #include "src/errno/libc_errno.h" 12 13 #include "src/__support/File/linux/lseekImpl.h" 14 #include "src/__support/OSUtil/syscall.h" // For internal syscall function. 15 #include "src/__support/common.h" 16 17 #include <sys/syscall.h> // For syscall numbers. 18 #include <unistd.h> // For off_t. 19 20 namespace LIBC_NAMESPACE_DECL { 21 22 LLVM_LIBC_FUNCTION(off_t, lseek, (int fd, off_t offset, int whence)) { 23 auto result = internal::lseekimpl(fd, offset, whence); 24 if (!result.has_value()) { 25 libc_errno = result.error(); 26 return -1; 27 } 28 return result.value(); 29 } 30 31 } // namespace LIBC_NAMESPACE_DECL 32