Fix undefined behaviour. * lib/bitrotate.h (rotl16, rotr16, rotl8, rotr8): Case x to 'unsigned int', to avoid shift operations on 'int'. * lib/xmemdup0.c (xmemdup0): Don't invoke memcpy with a zero size. * tests/test-count-leading-zeros.c (main): Use a random number that has as many bits as TYPE, not only 2*15 or 2*31 bits. * tests/test-count-trailing-zeros.c (main): Likewise. * tests/test-count-one-bits.c (main): Likewise. * tests/test-memmem.c: Don't include "null-ptr.h". (main): Use zerosize_ptr() instead of null_ptr(). * modules/memmem-tests (Files): Remove tests/null-ptr.h.

Description:
getgroups() function: return the supplementary group IDs of the current process.

Files:
lib/getgroups.c
m4/getgroups.m4

Depends-on:
unistd
malloc-posix    [test $HAVE_GETGROUPS = 0 || test $REPLACE_GETGROUPS = 1]
stdint          [test $HAVE_GETGROUPS = 0 || test $REPLACE_GETGROUPS = 1]

configure.ac:
gl_FUNC_GETGROUPS
if test $HAVE_GETGROUPS = 0 || test $REPLACE_GETGROUPS = 1; then
  AC_LIBOBJ([getgroups])
fi
gl_UNISTD_MODULE_INDICATOR([getgroups])

Makefile.am:

Include:
<unistd.h>

License:
LGPLv2+

Maintainer:
Jim Meyering, Eric Blake