GETGROUPLIST(3) BSD Library Functions Manual GETGROUPLIST(3)
NAME
getgrouplist -- calculate group access list
LIBRARY
Standard C Library (libc, -lc)
SYNOPSIS
#include <unistd.h>
int
getgrouplist(const char *name, gid_t basegid, gid_t *groups, int *ngroups);
DESCRIPTION
The getgrouplist() function reads through the group file and calculates the group access list for the user specified in name. The basegid is
automatically included in the groups list. Typically this value is given as the group number from the password file.
The resulting group list is returned in the array pointed to by groups. The caller specifies the size of the groups array in the integer
pointed to by ngroups; the actual number of groups found is returned in ngroups.
RETURN VALUES
The getgrouplist() function returns 0 on success and -1 if the size of the group list is too small to hold all the user's groups. Here, the
group array will be filled with as many groups as will fit.
FILES
/etc/group group membership list
SEE ALSO
setgroups(2), initgroups(3)
HISTORY
The getgrouplist() function first appeared in 4.4BSD.
BSD
October 26, 2014 BSD
