linkat: new module * modules/linkat: New file. * lib/at-func2.c (at_func2): Likewise. * lib/linkat.c (linkat): Likewise. * m4/linkat.m4 (gl_FUNC_LINKAT): Likewise. * lib/openat-priv.h (at_func2): Add declaration. * m4/unistd_h.m4 (gl_UNISTD_H_DEFAULTS): Add witnesses. * modules/unistd (Makefile.am): Substitute them. * lib/unistd.in.h (linkat): Declare it. * MODULES.html.sh (systems lacking POSIX:2008): Mention module. * doc/posix-functions/linkat.texi (linkat): Likewise. * doc/posix-functions/link.texi (link): Tweak wording. * tests/test-link.c (main): Move guts... * tests/test-link.h (test_link): ...into new file. * modules/linkat-tests: New test. * tests/test-linkat.c: Likewise. * modules/link-tests (Files): Ship new file. (Depends-on): Add stdbool. Signed-off-by: Eric Blake <ebb9@byu.net>

Description:
linkat(): create a hard link, relative to two directories

Files:
lib/at-func2.c
lib/linkat.c
m4/linkat.m4

Depends-on:
areadlink
dirname
errno
extensions
fcntl-h
filenamecat
openat
link
link-follow
lstat
readlink
same-inode
stpcpy
symlink
unistd

configure.ac:
gl_FUNC_LINKAT
gl_UNISTD_MODULE_INDICATOR([linkat])

Makefile.am:

Include:
<fcntl.h>
<unistd.h>

License:
GPL

Maintainer:
Jim Meyering, Eric Blake