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Force a write of all user-space buffered data for stdout in Formatter::print #1012

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merged 2 commits into from
Mar 15, 2017
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Force a write of all user-space buffered data for stdout in Formatter::print #1012

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055410d
Force a write of all user-space buffered data for stdout in Formatter…
lamerman Mar 3, 2017
52d9671
minor style change
dirk-thomas Mar 15, 2017
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27 changes: 27 additions & 0 deletions tools/rosconsole/src/rosconsole/rosconsole.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -107,6 +107,9 @@ std::string g_last_error_message = "Unknown Error";
#endif
const char* g_format_string = "[${severity}] [${time}]: ${message}";

bool g_force_stdout_line_buffered = false;
bool g_stdout_flush_failure_reported = false;

typedef std::map<std::string, std::string> M_string;
M_string g_extra_fixed_tokens;

Expand Down Expand Up @@ -393,6 +396,16 @@ void Formatter::print(void* logger_handle, ::ros::console::Level level, const ch
ss << COLOR_NORMAL;

fprintf(f, "%s\n", ss.str().c_str());

if (g_force_stdout_line_buffered && f == stdout)
{
int flush_result = fflush(f);
if (flush_result != 0 && !g_stdout_flush_failure_reported)
{
g_stdout_flush_failure_reported = true;
fprintf(stderr, "Error: failed to perform fflush on stdout, fflush return code is %d\n", flush_result);
}
}
}

Formatter g_formatter;
Expand Down Expand Up @@ -425,6 +438,20 @@ void initialize()
backend::function_notifyLoggerLevelsChanged = notifyLoggerLevelsChanged;
backend::function_print = _print;

std::string line_buffered;
if (get_environment_variable(line_buffered, "ROSCONSOLE_STDOUT_LINE_BUFFERED"))
{
if (line_buffered == "1")
{
g_force_stdout_line_buffered = true;
}
else if (line_buffered != "0")
{
fprintf(stderr, "Warning: unexpected value %s specified for ROSCONSOLE_STDOUT_LINE_BUFFERED. Default value 0 "
"will be used. Valid values are 1 or 0.\n", line_buffered.c_str());
}
}

::ros::console::impl::initialize();
g_initialized = true;
}
Expand Down