1 //===-- Linux implementation of getrandom ---------------------------------===// 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/random/getrandom.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/syscall.h> // For syscall numbers. 17 18 namespace LIBC_NAMESPACE_DECL { 19 20 LLVM_LIBC_FUNCTION(ssize_t, getrandom, 21 (void *buf, size_t buflen, unsigned int flags)) { 22 ssize_t ret = 23 LIBC_NAMESPACE::syscall_impl<ssize_t>(SYS_getrandom, buf, buflen, flags); 24 if (ret < 0) { 25 libc_errno = static_cast<int>(-ret); 26 return -1; 27 } 28 return ret; 29 } 30 31 } // namespace LIBC_NAMESPACE_DECL 32