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

[Eric Blake <eblake@xxxxxxxxxx>]

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.

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

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