initgroups

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)