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Linux 2.6 - man page for fgetgrent (linux section 3)

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

NAME
       fgetgrent - get group file entry

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

       struct group *fgetgrent(FILE *stream);

   Feature Test Macro Requirements for glibc (see feature_test_macros(7)):

       fgetgrent(): _SVID_SOURCE

DESCRIPTION
       The fgetgrent() function returns a pointer to a structure containing the group information
       from the file referred to by stream.  The first time it is called  it  returns  the  first
       entry;  thereafter,  it	returns  successive entries.  The file referred to by stream must
       have the same format as /etc/group (see group(5)).

       The group structure is defined in <grp.h> as follows:

	   struct group {
	       char   *gr_name;        /* group name */
	       char   *gr_passwd;      /* group password */
	       gid_t   gr_gid;	       /* group ID */
	       char  **gr_mem;	       /* group members */
	   };

RETURN VALUE
       The fgetgrent() function returns a pointer to a group structure, or NULL if there  are  no
       more  entries  or an error occurs.  In the event of an error, errno is set to indicate the
       cause.

ERRORS
       ENOMEM Insufficient memory to allocate group structure.

CONFORMING TO
       SVr4.

SEE ALSO
       endgrent(3), fgetgrent_r(3), fopen(3), getgrent(3), getgrgid(3), getgrnam(3), putgrent(3),
       setgrent(3), group(5)

COLOPHON
       This  page  is  part of release 3.55 of the Linux man-pages project.  A description of the
       project,    and	  information	 about	  reporting    bugs,	can    be    found     at
       http://www.kernel.org/doc/man-pages/.

GNU					    2013-04-19				     FGETGRENT(3)


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