Bug 10328 – std.stdio.write doesn't throw on failure

Running a simple hello world program import std.stdio; void main() { writeln("Hello World"); write("Hello World"); } And executing where /dev/null is redirected as input to stdout (causing an invalid fd) $ ./hello 1</dev/null http://forum.dlang.org/post/[email protected] Expected to see an exception thrown.

For comparison, here's the the same thing done to cat: $ cat 1</dev/null test cat: write error: Bad file descriptor

This is intended behavior. std.stdio.stdout is buffered, and the lines in your code have not attempted to write to the file descriptor yet. If you add: std.stdio.stdout.flush(); then it fails with an exception as expected. Note that C (and by using C's stdio as it's base, D also) decides whether to flush after newline depending on whether the file descriptor is a console or not.