putgrent - Man Page

write a group database entry to a file


Standard C library (libc, -lc)


#define _GNU_SOURCE         /* See feature_test_macros(7) */
#include <grp.h>

int putgrent(const struct group *restrict grp, FILE *restrict stream);


The putgrent() function is the counterpart for fgetgrent(3). The function writes the content of the provided struct group into the stream. The list of group members must be NULL-terminated or NULL-initialized.

The struct group is defined 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 function returns zero on success, and a nonzero value on error.


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

putgrent()Thread safetyMT-Safe


This function is a GNU extension.

See Also

fgetgrent(3), getgrent(3), group(5)

Referenced By

fgetgrent(3), getgrent(3), getgrent_r(3).

2022-12-15 Linux man-pages 6.03