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.  

RETURN VALUE

The initgroups() function returns 0 on success, or -1 if an error occurs.  

ERRORS

EPERM
The calling process does not have sufficient privileges.
ENOMEM
Insufficient memory to allocate group information structure.
 

FILES

/etc/group              group database file
 

CONFORMING TO

SVID 3, BSD 4.3  

NOTES

The prototype for initgroups is only available if _BSD_SOURCE is defined (either explicitly, or implicitly, by not defining _POSIX_SOURCE or compiling with the -ansi flag).  

SEE ALSO

getgroups(2), setgroups(2)