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/* vi: set sw=4 ts=4: */
/*
* getgroups() for uClibc
*
* Copyright (C) 2000-2006 Erik Andersen <andersen@uclibc.org>
*
* Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
*/
#include <sys/syscall.h>
#include <stdlib.h>
#include <unistd.h>
#include <grp.h>
/* libc_hidden_proto(getgroups) */
#if defined(__NR_getgroups32)
# undef __NR_getgroups
# define __NR_getgroups __NR_getgroups32
_syscall2(int, getgroups, int, size, gid_t *, list)
#elif __WORDSIZE == 64
_syscall2(int, getgroups, int, size, gid_t *, list)
#else
/* libc_hidden_proto(sysconf) */
#define MIN(a,b) (((a)<(b))?(a):(b))
#define __NR___syscall_getgroups __NR_getgroups
static __inline__ _syscall2(int, __syscall_getgroups,
int, size, __kernel_gid_t *, list)
int getgroups(int size, gid_t groups[])
{
if (unlikely(size < 0)) {
ret_error:
__set_errno(EINVAL);
return -1;
} else {
int i, ngids;
__kernel_gid_t *kernel_groups;
size = MIN(size, sysconf(_SC_NGROUPS_MAX));
kernel_groups = (__kernel_gid_t *)malloc(sizeof(*kernel_groups) * size);
if (size && kernel_groups == NULL)
goto ret_error;
ngids = __syscall_getgroups(size, kernel_groups);
if (size != 0 && ngids > 0) {
for (i = 0; i < ngids; i++) {
groups[i] = kernel_groups[i];
}
}
free(kernel_groups);
return ngids;
}
}
#endif
libc_hidden_def(getgroups)
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