initgroups(3) [linux man page]
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(): _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 CONFORMING TO
SVr4, 4.3BSD. SEE ALSO
getgroups(2), setgroups(2), credentials(7) COLOPHON
This page is part of release 3.27 of the Linux man-pages project. A description of the project, and information about reporting bugs, can be found at http://www.kernel.org/doc/man-pages/. GNU
2007-07-26 INITGROUPS(3)
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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) COLOPHON
This page is part of release 4.15 of the Linux man-pages project. A description of the project, information about reporting bugs, and the latest version of this page, can be found at https://www.kernel.org/doc/man-pages/. GNU 2017-09-15 INITGROUPS(3)