Source file src/internal/syscall/unix/getentropy_darwin.go

     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  
     7  package unix
     8  
     9  import (
    10  	"internal/abi"
    11  	"syscall"
    12  	"unsafe"
    13  )
    14  
    15  //go:cgo_import_dynamic libc_getentropy getentropy "/usr/lib/libSystem.B.dylib"
    16  
    17  func libc_getentropy_trampoline()
    18  
    19  // GetEntropy calls the macOS getentropy system call.
    20  func GetEntropy(p []byte) error {
    21  	_, _, errno := syscall_syscall(abi.FuncPCABI0(libc_getentropy_trampoline),
    22  		uintptr(unsafe.Pointer(&p[0])),
    23  		uintptr(len(p)),
    24  		0)
    25  	if errno != 0 {
    26  		return errno
    27  	}
    28  	return nil
    29  }
    30  
    31  //go:linkname syscall_syscall syscall.syscall
    32  func syscall_syscall(fn, a1, a2, a3 uintptr) (r1, r2 uintptr, err syscall.Errno)
    33  

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