github.com/ethereumproject/go-ethereum@v5.5.2+incompatible/cmd/geth/fdlimit_test.go (about)

     1  // Copyright 2016 The go-ethereum Authors
     2  // This file is part of go-ethereum.
     3  //
     4  // go-ethereum is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU General Public License as published by
     6  // the Free Software Foundation, either version 3 of the License, or
     7  // (at your option) any later version.
     8  //
     9  // go-ethereum is distributed in the hope that it will be useful,
    10  // but WITHOUT ANY WARRANTY; without even the implied warranty of
    11  // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
    12  // GNU General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU General Public License
    15  // along with go-ethereum. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package main
    18  
    19  import "testing"
    20  
    21  // TestFileDescriptorLimits simply tests whether the file descriptor allowance
    22  // per this process can be retrieved.
    23  func TestFileDescriptorLimits(t *testing.T) {
    24  	target := 4096
    25  
    26  	if limit, err := getFdLimit(); err != nil || limit <= 0 {
    27  		t.Fatalf("failed to retrieve file descriptor limit (%d): %v", limit, err)
    28  	}
    29  	if err := raiseFdLimit(uint64(target)); err != nil {
    30  		t.Fatalf("failed to raise file allowance")
    31  	}
    32  	if limit, err := getFdLimit(); err != nil || limit < target {
    33  		t.Fatalf("failed to retrieve raised descriptor limit (have %v, want %v): %v", limit, target, err)
    34  	}
    35  }