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

       getgrent, setgrent, endgrent - get group file entry

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

       struct group *getgrent(void);

       void setgrent(void);

       void endgrent(void);

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

           _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 500 ||
           /* Since glibc 2.12: */ _POSIX_C_SOURCE >= 200809L

       getgrent(), endgrent():
           _SVID_SOURCE || _BSD_SOURCE || _XOPEN_SOURCE >= 500 ||

       The  getgrent() function returns a pointer to a structure containing the broken-out fields
       of a record in the group database (e.g., the local group file /etc/group, NIS, and  LDAP).
       The  first  time  getgrent() is called, it returns the first entry; thereafter, it returns
       successive entries.

       The setgrent() function rewinds to the beginning of the group database, to allow  repeated

       The  endgrent() function is used to close the group database after all processing has been

       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 */

       For more information about the fields of this structure, see group(5).

       The getgrent() function returns a pointer to a group structure, or NULL if  there  are  no
       more entries or an error occurs.

       Upon  error,  errno  may be set.  If one wants to check errno after the call, it should be
       set to zero before the call.

       The return value may point to a static area, and may be overwritten by subsequent calls to
       getgrent(), getgrgid(3), or getgrnam(3).  (Do not pass the returned pointer to free(3).)

       EAGAIN The  service  was  temporarily  unavailable;  try again later.  For NSS backends in
              glibc this indicates a temporary error talking to the backend.  The error may  cor‐
              rect itself, retrying later is suggested.

       EINTR  A signal was caught.

       EIO    I/O error.

       EMFILE The calling process already has too many open files.

       ENFILE Too many open files in the system.

       ENOENT A  necessary  input file cannot be found.  For NSS backends in glibc this indicates
              the backend is not correctly configured.

       ENOMEM Insufficient memory to allocate group structure.

       ERANGE Insufficient buffer space supplied.

              local group database file

   Multithreading (see pthreads(7))
       The getgrent() function is not thread-safe.

       The setgrent() and endgrent() functions are thread-safe.

       SVr4, 4.3BSD, POSIX.1-2001.

       fgetgrent(3),  getgrent_r(3),  getgrgid(3),  getgrnam(3),  getgrouplist(3),   putgrent(3),

       This  page  is  part of release 3.74 of the Linux man-pages project.  A description of the
       project, information about reporting bugs, and the latest version of  this  page,  can  be
       found at http://www.kernel.org/doc/man-pages/.

                                            2014-10-02                                GETGRENT(3)

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