Manpages - fgetgrent.3

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)):

*fgetgrent*():

      Since glibc 2.19:
          _DEFAULT_SOURCE
      Glibc 2.19 and earlier:
          _SVID_SOURCE

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.

ENOMEM

Insufficient memory to allocate group structure.

For an explanation of the terms used in this section, see *attributes*(7).

SVr4.

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

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