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4a2a66e445
* modules/dup2-obsolete: New file. * m4/dup2-obsolete.m4: New file. * m4/dup2.m4 (gl_FUNC_DUP2): Don't check whether dup2 exists if gl_FUNC_DUP2_OBSOLETE is not also defined. * modules/dup2 (Depends-on): Add dup2-obsolete. * doc/posix-functions/dup2.texi: Mention module dup2-obsolete.
48 lines
1.2 KiB
Plaintext
48 lines
1.2 KiB
Plaintext
@node dup2
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@section @code{dup2}
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@findex dup2
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POSIX specification:@* @url{http://www.opengroup.org/onlinepubs/9699919799/functions/dup2.html}
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Gnulib module: dup2 or dup2-obsolete
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Portability problems fixed by either Gnulib module @code{dup2} or @code{dup2-obsolete}:
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@itemize
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@item
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This function always returns 0 for success on some platforms:
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mingw.
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@item
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This function can hang when duplicating an fd to itself on some platforms:
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mingw.
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@item
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This function resets the @code{FD_CLOEXEC} flag when duplicating an fd
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to itself on some platforms:
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Haiku.
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@item
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This function returns 0 for @code{dup2 (1, 1)} on some platforms:
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Cygwin 1.5.x.
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@item
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This function may return @code{-EBADF} instead of @code{-1} on some platforms:
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Linux releases between July 2008 and May 2009 (versions 2.6.27 to 2.6.29).
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@item
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This function returns @code{EMFILE} instead of @code{EBADF} for
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extremely large targets, which interferes with using
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@code{dup2(fd,fd)==fd)} as the minimal @code{EBADF} filter:
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FreeBSD 6.1, Cygwin 1.5.
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@end itemize
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Portability problems fixed by Gnulib module @code{dup2-obsolete}:
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@itemize
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@item
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This function is missing on some older platforms.
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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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