1 //===-- Linux implementation of sendfile ----------------------------------===// 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/sys/sendfile/sendfile.h" 10 11 #include "src/__support/OSUtil/syscall.h" // For internal syscall function. 12 #include "src/__support/common.h" 13 14 #include "src/errno/libc_errno.h" 15 #include <sys/sendfile.h> 16 #include <sys/syscall.h> // For syscall numbers. 17 18 namespace LIBC_NAMESPACE { 19 20 LLVM_LIBC_FUNCTION(ssize_t, sendfile, 21 (int out_fd, int in_fd, off_t *offset, size_t count)) { 22 #ifdef SYS_sendfile 23 ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_sendfile, in_fd, 24 out_fd, offset, count); 25 #elif defined(SYS_sendfile64) 26 // Same as sendfile but can handle large offsets 27 static_assert(sizeof(off_t) == 8); 28 ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_sendfile64, in_fd, 29 out_fd, offset, count); 30 #else 31 #error "sendfile and sendfile64 syscalls not available." 32 #endif 33 if (ret < 0) { 34 libc_errno = static_cast<int>(-ret); 35 return -1; 36 } 37 return ret; 38 } 39 40 } // namespace LIBC_NAMESPACE 41