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)

Information

Source
Linux kernel
OS/version
GNU
Source updated
September 15, 2017
Page created
February 9, 2018
Page generated
December 2, 2018