Peter Jay Salzman wrote:
Hi all,
Trying to write portable/correct code between Linux and MS Visual C++.
The cl.exe compiler is telling me that "strerror() is deprecated". Is that
true? I never heard such a thing. Tried Googling and couldn't find any
mention of strerror() being deprecated.
The compiler also told me that strerror() was unsafe. After thinking about
it for a second, I'm guessing it meant "thread unsafe".
Lastly, the compiler told me that I should use strerror_s() which is more
safe. I looked at the prototype for this function and it requires a buffer,
the buffer's length, and the errno. Passing a char * to be filled by a
function when you don't know how large of a buffer that function wants
hardly sounds like a good idea. How should this function be used safely?
Keep allocating memory until the buffer isn't filled all the way? Sounds
like I would need to write my own strerror function just to make sure the
buffer is large enough. Why would a standards committee do such a thing?
Lastly, strerror_s doesn't appear in any man pages on my Linux system.
However, it does appear to be similar to strerror_r() which my man pages say
is POSIX compliant (under a suitable #define).
What's the quickest fastest way of using strerror_r if on Linux and
strerror_s if on Windows?
Thanks,
Peter
One solution I have not heard mentioned today: don't use strerror at all.
The few times I have used it in twenty years of programming, it
has been for programs I did not plan on distributing anyway.
Normally, I try to handle all defined errors in a manner appropriate
to the context. For example, in an embedded system errors may be
reported through LEDs, and ENOMEM is pretty useless information
to the typical user of such a tool. In reality, errno is pretty
useless information to users in most contexts... it is really
debugging information, and incomplete for that purpose as well.
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