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setgroups(2) [bsd man page]

SETGROUPS(2)							System Calls Manual						      SETGROUPS(2)

setgroups - set group access list SYNOPSIS
#include <sys/param.h> setgroups(ngroups, gidset) int ngroups, *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, as defined in <sys/param.h>. Only the super-user may set new groups. RETURN VALUE
A 0 value is returned on success, -1 on error, with a error code stored in errno. ERRORS
The setgroups call will fail if: [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(3X) BUGS
The gidset array should be of type gid_t, but remains integer for compatibility with earlier systems. 4.2 Berkeley Distribution May 13, 1986 SETGROUPS(2)

Check Out this Related Man Page

GETGROUPS(2)						      BSD System Calls Manual						      GETGROUPS(2)

getgroups -- get group access list SYNOPSIS
#include <sys/param.h> #include <sys/types.h> #include <unistd.h> int getgroups(int gidsetlen, gid_t *gidset); DESCRIPTION
Getgroups() gets the current group access list of the current user process and stores it in the array gidset. The parameter gidsetlen indi- cates the number of entries that may be placed in gidset. Getgroups() returns the actual number of groups returned in gidset. No more than {NGROUPS_MAX} will ever be returned. If gidsetlen is 0, getgroups() returns the number of groups without modifying the gidset array. RETURN VALUES
A successful call returns the number of groups in the group set. A value of -1 indicates that an error occurred, and the error code is stored in the global variable errno. ERRORS
The possible errors for getgroups() are: [EINVAL] The argument gidsetlen is smaller than the number of groups in the group set. [EFAULT] The argument gidset specifies an invalid address. SEE ALSO
setgroups(2), initgroups(3) HISTORY
The getgroups() function call appeared in 4.2BSD. 4.2 Berkeley Distribution April 16, 1994 4.2 Berkeley Distribution
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