/etc/group
group database file
initgroups3
Initialize the supplementary group access list
Usage
#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
Library
Standard C library (libc, -lc)
Overview
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.
Return value
The initgroups() function returns 0 on success. On error, -1 is returned, and errno is set to indicate the error.
Errors
- ENOMEM
-
Insufficient memory to allocate group information structure.
- EPERM
-
The calling process has insufficient privilege. See the underlying system call setgroups(2).
Files
Attributes
For an explanation of the terms used in this section, see attributes(7).
| Interface | Attribute | Value |
| initgroups() | Thread safety | MT-Safe locale |
Releases
19 releases since Debian 1.1 (Buzz); the text changed 13 times.