NSLog doesn't work in my blessed HelperTool

Question

To create custom packets and use libpcap, I've created a helper tool that run as root thanks to SMJobBless. In my helper tool, NSLog doesn't send any logs to console.app. I have to use syslog which send me logs in the console, but I've got problems logging objects issues.

Does anyone have an idea why NSLog doesn't work in such a blessed helper tool ?

score 1 · Accepted Answer · answered May 14 '15 at 15:23

1

3 years after, just found the answer: logs are sent by the HelperTool by root user.

Launching Console.app with sudo make the logs appear.

answered May 14 '15 at 15:23

Tom

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score 1 · Answer 2 · answered Jan 11 '12 at 22:10

I have no idea why NSLog doesn't work in this case, but since syslog works you can work around it like this:

#define MyLog(fmt, ...) \
    syslog(LOG_INFO, [[NSString stringWithFormat:fmt, ##__VA_ARGS__] UTF8String]);

or if you want to influence the log level:

#define MyLog2(level, fmt, ...) \
    syslog(level, [[NSString stringWithFormat:fmt, ##__VA_ARGS__] UTF8String]);

Put the macro in your .pch file so you can access it in all your source files. You can then use them like NSLog, even with just one argument:

MyLog(@"Test, test, 1 2 3");
MyLog(@"Content of object: %@", myObject);

NSLog doesn't work in my blessed HelperTool

2 Answers2