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What events can cause ferror to return non-zero?


What events can cause ferror to return non-zero?

By : Gary Hau
Date : November 22 2020, 10:56 AM
around this issue It is primarily errors returned from the underlying system calls (e.g. read, write, lseek, close) that will cause the stream's error bit to be set.
Many f___() functions from stdio.h indicate that if the end-of-file is reached, or an error occurs, ferror() or feof() will indicate why. fscanf, for example:
code :


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ferror(file) == 32

ferror(file) == 32


By : vynsane
Date : March 29 2020, 07:55 AM
wish help you to fix your issue You are using ferror() in a wrong way: it works only on a valid (non-null) file handle. Passing it NULL (in the case fopen() fails) causes UB, which manifests in your case by printing a random value (not trapping on NULL pointer access suggests that the underlying platform does not have memory protection).
Message text for ferror() return value

Message text for ferror() return value


By : Richard Audisio
Date : March 29 2020, 07:55 AM
wish helps you From this reference page:
How to set the `-ferror-limit` when using Fastlane

How to set the `-ferror-limit` when using Fastlane


By : user4019701
Date : March 29 2020, 07:55 AM
I wish did fix the issue. Since fastlane changed from shenzhen to gym this parameter doesn't seem necessary anymore.
fread and ferror don't set errno

fread and ferror don't set errno


By : immortal
Date : November 25 2020, 11:01 PM
Hope this helps You can't get there from here.
fread does not set errno (as you have discovered), and as such you cannot really determine much about a specific error state; only that there is one. The exact nature of the error is generally implementation-dependent. There is no C standard-library-based portable way to gather it .
What is the behaviour of `ferror(FILE *)` and `std::ferror(FILE *)` when passed invalid pointers?

What is the behaviour of `ferror(FILE *)` and `std::ferror(FILE *)` when passed invalid pointers?


By : Ivan Wong
Date : October 04 2020, 10:00 AM
Hope this helps According to C draft N1570 §4.2 omissions are considered undefined behavior (emphasis added):
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