static void MaxOpenFiles(bool change)
{
var lim = new LibC.rlimit();
var ok = LibC.getrlimit((int)LibC.RLimit.NoFile, ref lim);
Console.WriteLine($"getrlimit({lim.cur}, {lim.max}) => {ok}");
if (!change)
{
return;
}
int n = 9000;
lim.cur = lim.max = (UInt64)n;
ok = LibC.setrlimit((int)LibC.RLimit.NoFile, ref lim);
Console.WriteLine($"setrlimit({lim.cur}, {lim.max}) => {ok}");
ok = LibC.getrlimit((int)LibC.RLimit.NoFile, ref lim);
Console.WriteLine($"getrlimit({lim.cur}, {lim.max}) => {ok}");
lim.cur = (UInt64)4000;
ok = LibC.setrlimit((int)LibC.RLimit.NoFile, ref lim);
Console.WriteLine($"setrlimit({lim.cur}, {lim.max}) => {ok}");
ok = LibC.getrlimit((int)LibC.RLimit.NoFile, ref lim);
Console.WriteLine($"getrlimit({lim.cur}, {lim.max}) => {ok}");
var a = new Stream[n];
var f = Path.GetTempFileName();
int i = 0;
try
{
for (i = 0; i < n; ++i)
{
a[i] = new FileStream(f, FileMode.Open, FileAccess.Read);
//var result = LibC.open(f, LibC.FileMode.S_IRUSR);
//var result = LibC.fopen(f, "rb");
//if (result == IntPtr.Zero)
//break;
}
}
catch
{
}
finally
{
for (int j = i - 1; j >= 0; --j)
{
a[j].Close();
}
}
Console.WriteLine($"#{i}");
}