libc/src/unistd/linux/lseek.cpp

   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/errno/libc_errno.h"
  11
  12 #include "src/__support/File/linux/lseekImpl.h"
  13 #include "src/__support/OSUtil/syscall.h" // For internal syscall function.
  14 #include "src/__support/common.h"
  15
  16 #include <sys/syscall.h> // For syscall numbers.
  17 #include <unistd.h>      // For off_t.
  18
  19 namespace LIBC_NAMESPACE {
  20
  21 LLVM_LIBC_FUNCTION(off_t, lseek, (int fd, off_t offset, int whence)) {
  22   auto result = internal::lseekimpl(fd, offset, whence);
  23   if (!result.has_value()) {
  24     libc_errno = result.error();
  25     return -1;
  26   }
  27   return result.value();
  28 }
  29
  30 } // namespace LIBC_NAMESPACE