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Source file src/k8s.io/klog/v2/internal/dbg/dbg.go

Documentation: k8s.io/klog/v2/internal/dbg

     1  // Go support for leveled logs, analogous to https://code.google.com/p/google-glog/
     2  //
     3  // Copyright 2013 Google Inc. All Rights Reserved.
     4  //
     5  // Licensed under the Apache License, Version 2.0 (the "License");
     6  // you may not use this file except in compliance with the License.
     7  // You may obtain a copy of the License at
     8  //
     9  //     http://www.apache.org/licenses/LICENSE-2.0
    10  //
    11  // Unless required by applicable law or agreed to in writing, software
    12  // distributed under the License is distributed on an "AS IS" BASIS,
    13  // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    14  // See the License for the specific language governing permissions and
    15  // limitations under the License.
    16  
    17  // Package dbg provides some helper code for call traces.
    18  package dbg
    19  
    20  import (
    21  	"runtime"
    22  )
    23  
    24  // Stacks is a wrapper for runtime.Stack that attempts to recover the data for
    25  // all goroutines or the calling one.
    26  func Stacks(all bool) []byte {
    27  	// We don't know how big the traces are, so grow a few times if they don't fit. Start large, though.
    28  	n := 10000
    29  	if all {
    30  		n = 100000
    31  	}
    32  	var trace []byte
    33  	for i := 0; i < 5; i++ {
    34  		trace = make([]byte, n)
    35  		nbytes := runtime.Stack(trace, all)
    36  		if nbytes < len(trace) {
    37  			return trace[:nbytes]
    38  		}
    39  		n *= 2
    40  	}
    41  	return trace
    42  }
    43  

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