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c74873191b
OpenBSD treats strerror_r(0,,) as a success, but with a message "Undefined error: 0"; while this is distinct from strerror_r(-1,,) returning "Unknown error: -1", it does not imply success. Meanwhile, if buf is short enough for ERANGE, then we can't use strstr to look for "Unknown" or "Undefined" in the resulting message, like we had been doing for strerror(). Fix this by shifting the burden - now the strerror-override code guarantees that 0 will have an override when needed. * lib/strerror-override.c (strerror_override): Also override 0 when needed. * lib/strerror-override.h (strerror_override): Likewise. * lib/strerror.c (strerror): Simplify, now that 0 override is done earlier. * lib/strerror_r.c (strerror_r): Likewise. * m4/strerror.m4 (gl_FUNC_STRERROR): Split detection of 0 behavior... (gl_FUNC_STRERROR_0): ...into new macro. * m4/strerror_r.m4 (gl_FUNC_STRERROR_R): Replace strerror_r if 0 is overridden. (gl_FUNC_STRERROR_R_WORKS): Avoid extra tests if 0 is broken. * modules/strerror-override (Files): Add strerror.m4. (configure.ac): Also provide override for 0 when needed. * doc/posix-functions/strerror.texi (strerror): Document this. * doc/posix-functions/perror.texi (perror): Likewise. Signed-off-by: Eric Blake <eblake@redhat.com>
39 lines
1.2 KiB
Plaintext
39 lines
1.2 KiB
Plaintext
@node perror
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@section @code{perror}
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@findex perror
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/perror.html}
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Gnulib module: perror
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Portability problems fixed by Gnulib:
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@itemize
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@item
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This function does not support the error values that are specified by POSIX
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but not defined by the system, on some platforms:
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OpenBSD 4.0, OSF/1 5.1, Cygwin 1.5.x, mingw.
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@item
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This function treats @code{errno} of 0 like failure, although POSIX
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requires that the message declare it as a success, on some platforms:
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FreeBSD 8.2, OpenBSD 4.7, MacOS X 10.5.
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@item
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This function clobbers the @code{strerror} buffer on some platforms:
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Cygwin 1.7.9.
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@item
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This function fails to print a useful a string for out-of-range integers on
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some platforms:
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HP-UX 11, IRIX 6.5, Solaris 8.
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@end itemize
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Portability problems not fixed by Gnulib:
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@itemize
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@item
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POSIX requires that this function set the stream error bit (detected
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by @code{ferror}) on write failure, but not all platforms do this:
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glibc 2.13, cygwin 1.7.9.
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@item
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POSIX requires that this function not alter stream orientation, but
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the gnulib replacement locks in byte orientation and fails on wide
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character streams.
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@end itemize
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