initgroups man page on FreeBSD

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INITGROUPS(3)		 BSD 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 tem‐
			porary storage.

SEE ALSO
     setgroups(2), getgrouplist(3)

HISTORY
     The initgroups() function appeared in 4.2BSD.

BUGS
     The getgrouplist() function called by initgroups() uses the routines
     based on getgrent(3).  If the invoking program uses any of these rou‐
     tines, the group structure will be overwritten in the call to
     initgroups().

BSD				 June 4, 1993				   BSD
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