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Use the same procedure as for 2009, outlined in
http://thread.gmane.org/gmane.comp.lib.gnulib.bugs/20081
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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>
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fcntl(0,F_DUPFD,10000000) mistakenly failed with EMFILE
instead of EINVAL, and fcntl(0,F_DUPFD,-1) mistakenly passed.
* m4/fcntl.m4 (gl_REPLACE_FCNTL): New macro.
(gl_FUNC_FCNTL): Use it. Test for F_DUPFD bug.
* lib/fcntl.c (rpl_fcntl) <F_DUPFD>: Work around it.
<F_DUPFD_CLOEXEC>: Reduce calls to _gl_register_dup.
* doc/posix-functions/fcntl.texi (fcntl): Document it.
Signed-off-by: Eric Blake <ebb9@byu.net>
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Implement F_DUPFD_CLOEXEC. The unit test still fails on systems
with other fcntl bugs (such as cygwin 1.5 mishandling F_DUPFD,
or mingw lacking fcntl altogether). Passes on Linux, both with
and without kernel support, and on cygwin 1.7.
* modules/fcntl (Files): List new files.
(configure.ac): Run a test.
* m4/fcntl.m4 (gl_FUNC_FCNTL): New file.
* lib/fcntl.c (rpl_fcntl): Likewise.
* m4/fcntl_h.m4 (gl_FCNTL_H_DEFAULTS): Add witness defaults.
(gl_FCNTL_H): Always replace fcntl.h.
* modules/fcntl-h (Makefile.am): Substitute witnesses.
* lib/fcntl.in.h (fcntl): Declare replacement.
(F_DUPFD_CLOEXEC, GNULIB_defined_F_DUPFD_CLOEXEC): New macro when
needed, plus a witness.
* doc/posix-functions/fcntl.texi (fcntl): Document this.
* doc/posix-headers/fcntl.texi (fcntl.h): Likewise.
* tests/test-fcntl.c: New file.
* modules/fcntl-tests: Likewise.
Signed-off-by: Eric Blake <ebb9@byu.net>
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