initgroups man page on CentOS

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INITGROUPS(3)		   Linux Programmer's Manual		 INITGROUPS(3)

NAME
       initgroups - initialize the supplementary group access list

SYNOPSIS
       #include <sys/types.h>
       #include <grp.h>

       int initgroups(const char *user, gid_t group);

DESCRIPTION
       The  initgroups() function initializes the group access list by reading
       the group database /etc/group and using all groups of which user	 is  a
       member.	The additional group group is also added to the list.

       The user argument must be non-NULL.

RETURN VALUE
       The  initgroups()  function  returns  0	on  success.   On error, -1 is
       returned, and errno is set appropriately.

ERRORS
       ENOMEM Insufficient memory to allocate group information structure.

       EPERM  The calling process has insufficient privilege. See the underly‚Äź
	      ing system call setgroups(2).

FILES
       /etc/group	   group database file

CONFORMING TO
       SVr4, 4.3BSD

NOTES
       The  prototype  for  initgroups()  is  only available if _BSD_SOURCE is
       defined.

SEE ALSO
       getgroups(2), setgroups(2)

GNU				  2004-10-10			 INITGROUPS(3)
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