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Linux 2.6 - man page for initgroups (linux section 3)

INITGROUPS(3)						     Linux Programmer's Manual						     INITGROUPS(3)

NAME
initgroups - initialize the supplementary group access list
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.
SEE ALSO
getgroups(2), setgroups(2), credentials(7)
GNU
2017-09-15 INITGROUPS(3)

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