fgetgrent - get group file entry
#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)):
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; /* NULL-terminated array of pointers
to names of group members */
};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 error.