NAME

initgroups − initialize the supplementary group access list

SYNOPSIS

#include <grp.h>
#include <sys/types.h>

int initgroups(const char ∗name, gid_t basegid);

MT-LEVEL

Unsafe

DESCRIPTION

initgroups() reads the group database, using getgrent(), to get the group membership for the user specified by name and then initializes the supplementary group access list of the calling process using setgroups().  (See getgrnam(3C)).  The basegid group id is also included in the supplementary group access list.  This is typically the real group id from the user database. 

While scanning the group database, if the number of groups, including the basegid entry, exceeds {NGROUPS_MAX}, subsequent group entries are ignored. 

RETURN VALUES

Upon successful completion, a value of 0 is returned.  Otherwise, a value of −1 is returned and errno is set to indicate the error. 

ERRORS

initgroups() will fail and not change the supplementary group access list if:

EPERM The effective user id is not superuser. 

SEE ALSO

getgroups(2), getgrnam(3C)

SunOS 5.2  —  Last change: 22 Jan 1993