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021c861919
Borrow ideas from dup_cloexec and dup3 to implement F_DUPFD and F_DUPFD_CLOEXEC. Support querying the inheritance status via F_GETFD, but for now, no support for changing with F_SETFD. The remaining portions of fcntl fail with EINVAL. * m4/fcntl.m4 (gl_FUNC_FCNTL): Also build fcntl.c on mingw. * lib/fcntl.c (fcntl) <F_DUPFD, F_DUPFD_CLOEXEC, F_GETFD>: Provide replacement for mingw. * modules/fcntl (Description): Update. (Depends-on): Add dup2. * m4/fcntl_h.m4 (gl_FCNTL_H_DEFAULTS): Add witness. * modules/fcntl-h (Makefile.am): Substitute it. * lib/fcntl.in.h (fcntl): Update declaration. (F_DUPFD, F_GETFD): New macros, when needed. * doc/posix-headers/fcntl.texi (fcntl.h): Update documentation. * doc/posix-functions/fcntl.texi (fcntl): Likewise. * tests/test-fcntl.c (check_flags, main): Enhance test for items we now guarantee. Signed-off-by: Eric Blake <ebb9@byu.net>
37 lines
977 B
Plaintext
37 lines
977 B
Plaintext
@node fcntl
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@section @code{fcntl}
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@findex fcntl
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POSIX specification: @url{http://www.opengroup.org/onlinepubs/9699919799/functions/fcntl.html}
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Gnulib module: fcntl
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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 @code{F_DUPFD_CLOEXEC} on some
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platforms:
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MacOS X 10.3, FreeBSD 6.0, NetBSD 3.0, OpenBSD 3.8, AIX 5.1, HP-UX 11,
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IRIX 6.5, OSF/1 5.1, Solaris 10, Cygwin 1.7.1, mingw, Interix 3.5,
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BeOS.
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Note that the gnulib replacement code is functional but not atomic.
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@item
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The @code{F_DUPFD} action of this function does not reject
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out-of-range targets properly on some platforms:
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Cygwin 1.5.x.
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@item
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This function is missing on some platforms:
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mingw.
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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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The replacement function does not support @code{F_SETFD},
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@code{F_GETFL}, @code{F_SETFL}, @code{F_GETOWN}, @code{F_SETOWN},
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@code{F_GETLK}, @code{F_SETLK}, and @code{F_SETLKW} on some platforms:
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mingw
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@end itemize
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