initgroups - initialize the supplementary group access list
#include <sys/types.h>
#include <grp.h>
int initgroups(const char *user, gid_t group);
Feature Test Macro Requirements for glibc (see
feature_test_macros(7)):
initgroups():
Since glibc 2.19:
_DEFAULT_SOURCE
Glibc 2.19 and earlier:
_BSD_SOURCE
The
initgroups() function initializes the group access list by reading
the group database
/etc/group and using all groups of which
user
is a member. The additional group
group is also added to the list.
The
user argument must be non-NULL.
The
initgroups() function returns 0 on success. On error, -1 is returned,
and
errno is set appropriately.
- ENOMEM
- Insufficient memory to allocate group information structure.
- EPERM
- The calling process has insufficient privilege. See the underlying system
call setgroups(2).
- /etc/group
- group database file
For an explanation of the terms used in this section, see
attributes(7).
| Interface |
Attribute |
Value |
| initgroups () |
Thread safety |
MT-Safe locale |
SVr4, 4.3BSD.
getgroups(2),
setgroups(2),
credentials(7)