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setgroups(2) [osx man page]

SETGROUPS(2)						      BSD System Calls Manual						      SETGROUPS(2)

setgroups -- set group access list SYNOPSIS
#include <sys/param.h> #include <unistd.h> int setgroups(int ngroups, const gid_t *gidset); DESCRIPTION
Setgroups() sets the group access list of the current user process according to the array gidset. The parameter ngroups indicates the number of entries in the array and must be no more than {NGROUPS_MAX}. Only the super-user may set new groups. Use of setgroups() is highly discouraged. RETURN VALUES
A 0 value is returned on success, -1 on error, with an error code stored in errno. ERRORS
The setgroups() call will fail if: [EINVAL] The value of ngroups is greater than {NGROUPS_MAX}. [EPERM] The caller is not the super-user. [EFAULT] The address specified for gidset is outside the process address space. SEE ALSO
getgroups(2), initgroups(3) HISTORY
The setgroups() function call appeared in 4.2BSD. 4.2 Berkeley Distribution September 15, 2010 4.2 Berkeley Distribution

Check Out this Related Man Page

getgroups(2)							System Calls Manual						      getgroups(2)

getgroups - get group access list SYNOPSIS
gets the current group access list of the user process and stores it in the array gidset. The parameter ngroups indicates the number of entries which may be placed in gidset. As a special case, if the ngroups argument is zero, returns the number of group entries for the process. In this case, the array pointed to by the gidset argument is not modified. EXAMPLES
The following call to (see getgroups(2)) retrieves the group access list of the calling process and stores the group ids in array mygidset: RETURN VALUE
If successful, returns a non-negative value indicating the number of elements returned in gidset. If an error occurs, a value of -1 is returned and is set to indicate the type of error. ERRORS
fails if any of the following conditions are encountered: gidset specifies an invalid address. The reliable detection of this error is implementation dependent. The argument ngroups is not zero and is less than the number of groups in the current group access list of the process. AUTHOR
was developed by HP and the University of California, Berkeley. SEE ALSO
setgroups(2), sysconf(2), initgroups(3C). STANDARDS CONFORMANCE
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