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.
setgroups(2),
getgrouplist(3)
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().
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