5 POSIX specification:@* @url{https://pubs.opengroup.org/onlinepubs/9699919799/functions/perror.html}
9 Portability problems fixed by Gnulib:
12 This function does not support the error values that are specified by POSIX
13 but not defined by the system, on some platforms:
14 OpenBSD 4.0, Cygwin 1.5.x, mingw, MSVC 14.
16 This function treats @code{errno} of 0 like failure, although POSIX
17 requires that the message declare it as a success, on some platforms:
18 FreeBSD 8.2, OpenBSD 4.7, Mac OS X 10.13.
20 This function clobbers the @code{strerror} buffer on some platforms:
23 This function fails to print a useful a string for out-of-range integers on
28 Portability problems not fixed by Gnulib:
31 POSIX requires that this function set the stream error bit (detected
32 by @code{ferror}) on write failure, but not all platforms do this:
33 glibc 2.13, cygwin 1.7.9.
35 POSIX requires that this function not alter stream orientation, but
36 the gnulib replacement locks in byte orientation and fails on wide