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initgroups

Section: C Library Functions (3)
Updated: 202-0-08
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NAME

initgroups - initialize the supplementary group access list

LIBRARY

Standard C library (libc,~-lc)

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 no-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

/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	M-Safe locale

STANDARDS

None.

HISTORY

SVr4, 4.3BSD.