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fixed debug logging to not use up one extra file descriptor per connection

This commit is contained in:
Arvid Norberg 2010-04-11 21:20:38 +00:00
parent 62eef91338
commit fb12950098
1 changed files with 32 additions and 28 deletions
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60
include/libtorrent/debug.hpp
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@ -46,48 +46,52 @@ namespace libtorrent
{
// DEBUG API
#if TORRENT_USE_IOSTREAM
// all log streams share a single file descriptor
// and re-opens the file for each log line
static std::ofstream log_file;
static std::string open_filename;
#endif
struct logger
{
logger(std::string const& logpath, std::string const& filename
, int instance, bool append = true)
, int instance, bool append)
{
#if TORRENT_USE_IOSTREAM
#ifndef BOOST_NO_EXCEPTIONS
try
{
#endif
char log_name[256];
snprintf(log_name, sizeof(log_name), "libtorrent_logs%d", instance);
std::string dir(complete(combine_path(logpath, log_name)));
error_code ec;
if (!exists(dir)) create_directories(dir, ec);
m_file.open(combine_path(dir, filename).c_str()
, std::ios_base::out | (append ? std::ios_base::app : std::ios_base::out));
*this << "\n\n\n*** starting log ***\n";
#ifndef BOOST_NO_EXCEPTIONS
}
catch (std::exception& e)
{
std::cerr << "failed to create log '" << filename << "': " << e.what() << std::endl;
}
#endif
#endif
char log_name[512];
snprintf(log_name, sizeof(log_name), "libtorrent_logs%d", instance);
std::string dir(complete(combine_path(logpath, log_name)));
error_code ec;
if (!exists(dir)) create_directories(dir, ec);
m_filename = combine_path(dir, filename);
m_append = append;
*this << "\n\n\n*** starting log ***\n";
}
#if TORRENT_USE_IOSTREAM
void open()
{
if (open_filename == m_filename) return;
log_file.close();
log_file.open(m_filename.c_str(), m_append ? std::ios_base::app : std::ios_base::out);
open_filename = m_filename;
if (!log_file.good())
fprintf(stderr, "Failed to open logfile %s: %s\n", m_filename.c_str(), strerror(errno));
}
#endif
template <class T>
logger& operator<<(T const& v)
{
#if TORRENT_USE_IOSTREAM
m_file << v;
m_file.flush();
open();
log_file << v;
#endif
return *this;
}
#if TORRENT_USE_IOSTREAM
std::ofstream m_file;
#endif
std::string m_filename;
bool m_append;
};
}