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To protect your server, sandbox allows only a limited number of system calls to be called in submissions. Normally, the program, which read data from stdin, process data in CPU, and write results to stdout, can not get this error. If your program matchs the situation but get this error, run the following commands in shell:
uname -a
gcc -v
cd /path/to/moodle/mod/assignment/type/onlinejudge/
cd sandbox
make test
cd ..
./languages/c.sh yourprog.c a.out # use ./languages/cpp.sh for C++ code
./sandbox/sand a.out
echo $?
strace ./a.out Send youprog.c, a.out and the output of all the above commands to sunner@gmail.com
- Check whether the judge daemon is running. The process's name should be php or php.exe
- If the daemon quits by itself, check your PHP log (default to syslog or Windows NT events log) for detail error messages.
OJ currently supports two kinds of judge engine: sandbox and ideone.com. The following table describes the difference.
| Judge | Supported OSes | Internet | Speed | Languages | Limits | Safe |
|---|---|---|---|---|---|---|
| sandbox | Linux only | Not required | Depends on your server load. Normally faster than ideone.com | C/C++ only | No | Yes, but it depends on the sandbox |
| ideone.com | Linux & Windows | Required | Depends on the internet conection and ideone.com's load. | 40+ | 1000 submissions/month | Sure, no submissions will be executed on your server |
Since the developers are using Linux, OJ supports Linux better. We did only a few testings under Windows.
And, Windows doesn't support all the features we provide.