Possible bug in setvbuf handling

[miqlas]

The latest fish-shell doesn't print newline character after the commands. The fish developers concluded it could be abug in the setvbuf handling in Haiku:

I've determined the problem is due to a bug in the setvbuf() function on Haiku. Fish calls it to set stdout to fully unbuffered. That causes any subsequent writes using that file handle to discard the output. It only seems to affect wide char output. If you compile and run the following program you'll see that "goodbye" isn't seen:


{{{
#include <stdio.h>
#include <wchar.h>
int main() {
    fwprintf(stdout, L"hello\n");
    setvbuf(stdout, NULL, _IONBF, 0);
    fwprintf(stdout, L"goodbye\n");
}
}}}


If you switch to fprintf() it works.

I think I'm still going to replace the fputwc() calls with simple write() calls since that should be okay but you should file a bug with the Haiku project about this.

Original issue at fish-shell page: ​https://github.com/fish-shell/fish-shell/issues/4100

[waddlesplash]

fish has worked around the bug upstream; the reduced testcase is valid of course.

[miqlas]

Maybe relevant:

The current fish version in HaikuPorts is completly broken on current Haiku. I'm sure i used this Fish version on earlier Haiku revision without problems like this.

[miqlas]

Should we mark this as beta-blocker?

[pulkomandy]

No. A beta is feature complete but it may have bugs. These can get fixed in later updates, and then released in beta2 (we will try very hard to not release it in 2025).