github.com/hxx258456/ccgo@v0.0.5-0.20230213014102-48b35f46f66f/internal/syscall/unix/getentropy_darwin.go (about)

     1  // Copyright 2021 The Go Authors. All rights reserved.
     2  // Use of this source code is governed by a BSD-style
     3  // license that can be found in the LICENSE file.
     4  
     5  //go:build darwin && !ios
     6  // +build darwin,!ios
     7  
     8  package unix
     9  
    10  import (
    11  	"syscall"
    12  	"unsafe"
    13  
    14  	"github.com/hxx258456/ccgo/internal/abi"
    15  )
    16  
    17  //go:cgo_import_dynamic libc_getentropy getentropy "/usr/lib/libSystem.B.dylib"
    18  
    19  func libc_getentropy_trampoline()
    20  
    21  // GetEntropy calls the macOS getentropy system call.
    22  func GetEntropy(p []byte) error {
    23  	_, _, errno := syscall_syscall(abi.FuncPCABI0(libc_getentropy_trampoline),
    24  		uintptr(unsafe.Pointer(&p[0])),
    25  		uintptr(len(p)),
    26  		0)
    27  	if errno != 0 {
    28  		return errno
    29  	}
    30  	return nil
    31  }
    32  
    33  //go:linkname syscall_syscall syscall.syscall
    34  func syscall_syscall(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err syscall.Errno)