/* provide consistent interface to getgroups for systems that don't allow N==0
- Copyright (C) 1996, 1999, 2003, 2006, 2007, 2008, 2009 Free
- Software Foundation, Inc.
+ Copyright (C) 1996, 1999, 2003, 2006-2013 Free Software Foundation, Inc.
This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
#include <errno.h>
#include <stdlib.h>
+#include <stdint.h>
#if !HAVE_GETGROUPS
/* Provide a stub that fails with ENOSYS, since there is no group
information available on mingw. */
int
-getgroups (int n _UNUSED_PARAMETER_, GETGROUPS_T *groups _UNUSED_PARAMETER_)
+getgroups (int n _GL_UNUSED, GETGROUPS_T *groups _GL_UNUSED)
{
errno = ENOSYS;
return -1;
#else /* HAVE_GETGROUPS */
# undef getgroups
+# ifndef GETGROUPS_ZERO_BUG
+# define GETGROUPS_ZERO_BUG 0
+# endif
+
+/* On OS X 10.6 and later, use the usual getgroups, not the one
+ supplied when _DARWIN_C_SOURCE is defined. _DARWIN_C_SOURCE is
+ normally defined, since it means "conform to POSIX, but add
+ non-POSIX extensions even if that violates the POSIX namespace
+ rules", which is what we normally want. But with getgroups there
+ is an inconsistency, and _DARWIN_C_SOURCE means "change getgroups()
+ so that it no longer works right". The BUGS section of compat(5)
+ says that the behavior is dubious if you compile different sections
+ of a program with different _DARWIN_C_SOURCE settings, so fix only
+ the offending symbol. */
+# ifdef __APPLE__
+int posix_getgroups (int, gid_t []) __asm ("_getgroups");
+# define getgroups posix_getgroups
+# endif
/* On at least Ultrix 4.3 and NextStep 3.2, getgroups (0, NULL) always
fails. On other systems, it returns the number of supplemental
GETGROUPS_T *gbuf;
int saved_errno;
- if (n != 0)
+ if (n < 0)
+ {
+ errno = EINVAL;
+ return -1;
+ }
+
+ if (n != 0 || !GETGROUPS_ZERO_BUG)
{
int result;
- int saved_errno;
if (sizeof *group == sizeof *gbuf)
return getgroups (n, (GETGROUPS_T *) group);
- if (n < 0)
- {
- errno = EINVAL;
- return -1;
- }
if (SIZE_MAX / sizeof *gbuf <= n)
{
errno = ENOMEM;
}
saved_errno = errno;
free (gbuf);
- errno == saved_errno;
+ errno = saved_errno;
return result;
}