SYNOPSIS
#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
DESCRIPTION
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 appropriately.ERRORS
- ENOMEM
- Insufficient memory to allocate group information structure.
- EPERM
- The calling process has insufficient privilege. See the underlying system call setgroups(2).
FILES
/etc/group group database file
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).| Interface | Attribute | Value |
| initgroups() | Thread safety | MT-Safe locale |
CONFORMING TO
SVr4, 4.3BSD.COLOPHON
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