initgroups(3) - Linux man page

Name

initgroups - initialize the supplementary group access list

Synopsis

#include <sys/types.h>#include <grp.h>
int initgroups(const char *user, gid_t group);

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

Notes

The prototype for initgroups() is only available if _BSD_SOURCE is defined.

See Also

getgroups(2), setgroups(2)

Referenced By

credentials(7), group(5), nss(5), nss_ldap(5), slapd(8)