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SubjectReturn value of syscalls

while debugging glibc-2.3.1 for cris-axis-linux-gnu, I encountered a
discrepancy between code and comments explaining the return value of
syscalls of the kernel (in glibc's source, architecture specific for
cris). The comment says, values between -4095 and -1 (both inclusive)
are considered to be an error. However, the code checks the return value
to be greater or equal than -4096.

I'd like to fix that. But I need to know what's wrong, the code or the
comment. So, what values indicate an error in linux's syscalls?

Best regards, Uwe

P.S.: A look in other architecture's source in glibc makes me thing the
comment is right. I just want to make sure.

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