github.com/jimmyx0x/go-ethereum@v1.10.28/common/fdlimit/fdlimit_test.go (about)

     1  // Copyright 2016 The go-ethereum Authors
     2  // This file is part of the go-ethereum library.
     3  //
     4  // The go-ethereum library is free software: you can redistribute it and/or modify
     5  // it under the terms of the GNU Lesser 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  // The go-ethereum library 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 Lesser General Public License for more details.
    13  //
    14  // You should have received a copy of the GNU Lesser General Public License
    15  // along with the go-ethereum library. If not, see <http://www.gnu.org/licenses/>.
    16  
    17  package fdlimit
    18  
    19  import (
    20  	"testing"
    21  )
    22  
    23  // TestFileDescriptorLimits simply tests whether the file descriptor allowance
    24  // per this process can be retrieved.
    25  func TestFileDescriptorLimits(t *testing.T) {
    26  	target := 4096
    27  	hardlimit, err := Maximum()
    28  	if err != nil {
    29  		t.Fatal(err)
    30  	}
    31  	if hardlimit < target {
    32  		t.Skipf("system limit is less than desired test target: %d < %d", hardlimit, target)
    33  	}
    34  
    35  	if limit, err := Current(); err != nil || limit <= 0 {
    36  		t.Fatalf("failed to retrieve file descriptor limit (%d): %v", limit, err)
    37  	}
    38  	if _, err := Raise(uint64(target)); err != nil {
    39  		t.Fatalf("failed to raise file allowance")
    40  	}
    41  	if limit, err := Current(); err != nil || limit < target {
    42  		t.Fatalf("failed to retrieve raised descriptor limit (have %v, want %v): %v", limit, target, err)
    43  	}
    44  }