| INITGROUPS(3) | Library Functions Manual | INITGROUPS(3) |
initgroups —
initialize supplementary group IDs
#include
<unistd.h>
int
initgroups(const
char *name, gid_t
basegid);
The
initgroups()
function uses the getgrouplist(3) function to calculate
the supplementary group IDs for the user specified in
name. This group list is then set up for the current
process using setgroups(2). The
basegid is automatically included in the group list.
Typically this value is given as the group number from the password
file.
If the groups database lists more than
NGROUPS_MAX groups for name
(including one for basegid), the later groups are
ignored.
The initgroups() function returns -1 if it
was not invoked by the superuser.
The initgroups() function appeared in
4.2BSD.
The getgrouplist(3) function called by
initgroups() uses the routines based on
getgrent(3). If the invoking program uses any of these
routines, the group structure will be overwritten in the call to
initgroups().
| February 5, 2015 | Debian |