I have the following Ruby code:

system "clang test.c -o test"
system "./test"

When I execute the above Ruby code, the stdout is printed, but the stderr is not.

When I run clang test.c -o test && ./test from the terminal, I get a segmentation fault, but the Ruby script does not print this.

How can I get the Ruby script to print all output from the system command?

CodePudding user response：

The output "segmentation fault" is not printed by your test program itself. If you see this in your shell, it is in fact printed by the shell itself as a result of your program segfaulting.

Ruby does not print this. You can check the return code of your program after the system cal returned however using the $? variable which contains a Process::Status object. Here, you can e.g. check for signaled? to check if the process aborted due to a signal and then get this signal with the stopsig method. The signal number for a segmentation fault is 11.