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It returns the string of the error constant, not its description (as
strerrordesc_np). To handle the Hurd error mapping, the ERR_MAP was
removed from errlist.h to errlist.c.
Also, the testcase test-strerr (added on 325081b9eb2) was not added
on the check build neither it builds correctly. This patch also
changed it to decouple from errlist.h, the expected return values
are added explicitly for both both strerrorname_np and strerrordesc_np
directly.
Checked on x86_64-linux-gnu and i686-linux-gnu. I also run a make
check for i686-gnu.
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The strerrorname_np returns error number name (e.g. "EINVAL" for EINVAL)
while strerrordesc_np returns string describing error number (e.g
"Invalid argument" for EINVAL). Different than strerror,
strerrordesc_np does not attempt to translate the return description,
both functions return NULL for an invalid error number.
They should be used instead of sys_errlist and sys_nerr, both are
thread and async-signal safe. These functions are GNU extensions.
Checked on x86-64-linux-gnu, i686-linux-gnu, powerpc64le-linux-gnu,
and s390x-linux-gnu.
Tested-by: Carlos O'Donell <carlos@redhat.com>
Reviewed-by: Carlos O'Donell <carlos@redhat.com>
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