#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)):
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 to indicate the error.
Insufficient memory to allocate group information structure.
The calling process has insufficient privilege. See the underlying system call setgroups(2).
group database file
For an explanation of the terms used in this section, see attributes(7).
|initgroups()||Thread safety||MT-Safe locale|
getgroups(2), setgroups(2), credentials(7)
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credentials(7), getgroups(2), group(5), nss(5), slapd(8).