github.com/tetratelabs/wazero@v1.7.3-0.20240513003603-48f702e154b5/internal/sysfs/futimens_darwin.go (about)

     1  package sysfs
     2  
     3  import (
     4  	"syscall"
     5  	_ "unsafe"
     6  
     7  	experimentalsys "github.com/tetratelabs/wazero/experimental/sys"
     8  )
     9  
    10  const (
    11  	_AT_FDCWD            = -0x2
    12  	_AT_SYMLINK_NOFOLLOW = 0x0020
    13  	_UTIME_OMIT          = -2
    14  )
    15  
    16  //go:noescape
    17  //go:linkname utimensat syscall.utimensat
    18  func utimensat(dirfd int, path string, times *[2]syscall.Timespec, flags int) error
    19  
    20  func utimens(path string, atim, mtim int64) experimentalsys.Errno {
    21  	times := timesToTimespecs(atim, mtim)
    22  	if times == nil {
    23  		return 0
    24  	}
    25  	var flags int
    26  	return experimentalsys.UnwrapOSError(utimensat(_AT_FDCWD, path, times, flags))
    27  }
    28  
    29  func futimens(fd uintptr, atim, mtim int64) experimentalsys.Errno {
    30  	times := timesToTimespecs(atim, mtim)
    31  	if times == nil {
    32  		return 0
    33  	}
    34  	_p0 := timesToPtr(times)
    35  
    36  	// Warning: futimens only exists since High Sierra (10.13).
    37  	_, _, e1 := syscall_syscall6(libc_futimens_trampoline_addr, fd, uintptr(_p0), 0, 0, 0, 0)
    38  	return experimentalsys.UnwrapOSError(e1)
    39  }
    40  
    41  // libc_futimens_trampoline_addr is the address of the
    42  // `libc_futimens_trampoline` symbol, defined in `futimens_darwin.s`.
    43  //
    44  // We use this to invoke the syscall through syscall_syscall6 imported below.
    45  var libc_futimens_trampoline_addr uintptr
    46  
    47  // Imports the futimens symbol from libc as `libc_futimens`.
    48  //
    49  // Note: CGO mechanisms are used in darwin regardless of the CGO_ENABLED value
    50  // or the "cgo" build flag. See /RATIONALE.md for why.
    51  //go:cgo_import_dynamic libc_futimens futimens "/usr/lib/libSystem.B.dylib"