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79d4e75d8e
MacOS X 10.5 strerror(0) is "Unknown error: 0", which is not distinguished from "Unknown error: -1" for out-of-range. Worse, strerror_r(0,,) is "Undefined error: 0", although strerror_r for all other out-of-range values matches strerror. * m4/strerror.m4 (gl_FUNC_STRERROR): Flush out MacOS bug. * m4/strerror_r.m4 (gl_FUNC_STRERROR_R_WORKS): Likewise, and fix logic bug. * lib/strerror_r.c (strerror_r): Fix the bug. * lib/strerror.c (strerror): Likewise. * doc/posix-functions/strerror_r.texi (strerror_r): Document the problem. * doc/posix-functions/strerror.texi (strerror): Likewise. * doc/posix-functions/perror.texi (perror): Likewise. * tests/test-strerror.c (main): Enhance test. * tests/test-strerror_r.c (main): Likewise. Signed-off-by: Eric Blake <eblake@redhat.com>
34 lines
1.1 KiB
Plaintext
34 lines
1.1 KiB
Plaintext
@node strerror
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@section @code{strerror}
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@findex strerror
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/strerror.html}
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Gnulib module: strerror
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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, NonStop Kernel, Cygwin 1.5.x, mingw.
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@item
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This function reports failure for @code{strerror(0)} (by setting
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@code{errno} or using a string similar to out-of-range values),
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although POSIX requires this to leave @code{errno} unchanged and
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report success, on some platforms:
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FreeBSD 8.2, MacOS X 10.5.
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@item
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This function fails to return 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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(Some return NULL which is a POSIX violation, others return the empty
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string which is valid but not as useful); this can still cause bugs
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because most programs call @code{strerror} without setting and testing
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@code{errno}.)
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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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@end itemize
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