INITGROUPS(3)          FreeBSD Library Functions Manual          INITGROUPS(3)

NAME
     initgroups - initialize group access list

LIBRARY
     Standard C Library (libc, -lc)

SYNOPSIS
     #include <unistd.h>

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

DESCRIPTION
     The initgroups() function uses the getgrouplist(3) function to calculate
     the group access list for the user specified in name.  This group list is
     then setup for the current process using setgroups(2).  The basegid is
     automatically included in the groups list.  Typically this value is given
     as the group number from the password file.

RETURN VALUES
     The initgroups() function returns the value 0 if successful; otherwise
     the value -1 is returned and the global variable errno is set to indicate
     the error.

ERRORS
     The initgroups() function may fail and set errno for any of the errors
     specified for the library function setgroups(2).  It may also return:

     [ENOMEM]           The initgroups() function was unable to allocate
                        temporary storage.

SEE ALSO
     setgroups(2), getgrouplist(3)

HISTORY
     The initgroups() function appeared in 4.2BSD.

FreeBSD 13.1-RELEASE-p6        October 26, 2014        FreeBSD 13.1-RELEASE-p6