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Re: [Xen-devel] [Qemu-devel] [PATCH 15/16] os-posix: cleanup: Replace perror with error_report

On 04/24/2018 10:40 AM, Eric Blake wrote:
> On 04/24/2018 10:18 AM, Daniel P. Berrangé wrote:
>>>  - static void vreport(report_type type, const char *fmt, va_list ap)
>>>  + static void vreport(report_type type, int errnoval, const char *fmt, 
>>> va_list ap)
>>> ...
>>>  +     if (errnoval >= 0) {
>>>  +         error_printf(": %s", strerror(errnoval);
>>>  +     }
>>> and then add both
>>>   error_report_errno
>>>   error_vreport_errno
>>> with the obvious semantics.
>> That would be nice, because then we can make these two functions actually
>> use strerror_r() instead of strerror(), for thread safety on all platforms.
> Except that strerror_r() is a bear to use portably, given that glibc's
> default declaration differs from the POSIX requirement (you can force
> glibc to give you the POSIX version, but doing so causes you to lose
> access to many other useful extensions).  It's rather telling that 'git
> grep strerror_r' currently comes up empty.

That said, glib's g_strerror() may be suitable for this purpose,
although we are currently using it only in tests/ivshmem-test.c.

Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3266
Virtualization:  qemu.org | libvirt.org

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