I have noticed recently, when porting BSD applications, that if main exits normally, the buffers are not flushed. This is most obvious when using StdLib along with printf or fprintf to stdout.

Has anyone else noticed this? If there is a \n in the output, it gets flushed to stdout, but if the string does not contain a \n then often nothing happens. This is most obvious with 1-line help or logo strings that never show up. Of course, most BSD apps use stderr for their usage, but even this doesn’t go anywhere

static void

usage(void)

{

               (void)fprintf(stderr, "usage: which [-as] program ...\n");

               exit(EXIT_FAILURE);

}

Per the posix standard:

OpenGroup says:

https://pubs.opengroup.org/onlinepubs/009695399/functions/exit.html

The exit() function shall then flush all open streams with unwritten buffered data, close all open streams, and remove all files created by tmpfile(). Finally, control shall be terminated with the consequences described below.

I have seen similar behavior with CURL and printf.

Any thoughts here?

Tim