table of contents
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¶
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/.
2017-09-15 | GNU |