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/__support/macros/config.h" 15 #include "src/errno/libc_errno.h" 16 #include <sys/sendfile.h> 17 #include <sys/syscall.h> // For syscall numbers. 18 19 namespace LIBC_NAMESPACE_DECL { 20 21 LLVM_LIBC_FUNCTION(ssize_t, sendfile, 22 (int out_fd, int in_fd, off_t *offset, size_t count)) { 23 #ifdef SYS_sendfile 24 ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_sendfile, in_fd, 25 out_fd, offset, count); 26 #elif defined(SYS_sendfile64) 27 // Same as sendfile but can handle large offsets 28 static_assert(sizeof(off_t) == 8); 29 ssize_t ret = LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_sendfile64, in_fd, 30 out_fd, offset, count); 31 #else 32 #error "sendfile and sendfile64 syscalls not available." 33 #endif 34 if (ret < 0) { 35 libc_errno = static_cast<int>(-ret); 36 return -1; 37 } 38 return ret; 39 } 40 41 } // namespace LIBC_NAMESPACE_DECL 42