os_linux_settime32.go

     1  // Copyright 2025 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 linux && (386 || arm || mips || mipsle || (gccgo && (ppc || s390)))
     6  
     7  package runtime
     8  
     9  import "internal/runtime/atomic"
    10  
    11  var timer32bitOnly atomic.Bool
    12  
    13  //go:noescape
    14  func timer_settime32(timerid int32, flags int32, new, old *itimerspec32) int32
    15  
    16  //go:noescape
    17  func timer_settime64(timerid int32, flags int32, new, old *itimerspec) int32
    18  
    19  //go:nosplit
    20  func timer_settime(timerid int32, flags int32, new, old *itimerspec) int32 {
    21  	if !timer32bitOnly.Load() {
    22  		ret := timer_settime64(timerid, flags, new, old)
    23  		// timer_settime64 is only supported on Linux 5.0+
    24  		if ret != -_ENOSYS {
    25  			return ret
    26  		}
    27  		timer32bitOnly.Store(true)
    28  	}
    29  
    30  	var newts, oldts itimerspec32
    31  	var new32, old32 *itimerspec32
    32  
    33  	if new != nil {
    34  		newts.it_interval.setNsec(new.it_interval.tv_sec*1e9 + new.it_interval.tv_nsec)
    35  		newts.it_value.setNsec(new.it_value.tv_sec*1e9 + new.it_value.tv_nsec)
    36  		new32 = &newts
    37  	}
    38  
    39  	if old != nil {
    40  		oldts.it_interval.setNsec(old.it_interval.tv_sec*1e9 + old.it_interval.tv_nsec)
    41  		oldts.it_value.setNsec(old.it_value.tv_sec*1e9 + old.it_value.tv_nsec)
    42  		old32 = &oldts
    43  	}
    44  
    45  	// Fall back to 32-bit timer
    46  	return timer_settime32(timerid, flags, new32, old32)
    47  }
    48
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