In qtest.c, using non-reentrant function in signal handler can lead to unpredictable result. about lab0-c HOT 2 CLOSED

@soyWXY , vfprintf would internally call write, thus, there is no need to consider reentrant issue in this case. Also, I suppose this lab would not raise reentrant problem. If there is no other concern, I will close the issue.

from lab0-c.

First, stdio is non-reentrant for some reasons. Explanation is in the second and third paragraph in description section over here. Further, stdio call might implicitly invocate malloc() which is also non-reentrant, so it is better to check the manual to determine if a library function is reentrant.

Second, about this lab, I'll say if any stdio function triggers SIGSEGV, the non-reentrant problem is raised, and formatted output can possibly do that.

from lab0-c.