fgetgrent(3) Library Functions Manual fgetgrent(3)
NAME
fgetgrent - get group file entry
LIBRARY
Standard C library (libc, -lc)
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():
Since glibc 2.19:
_DEFAULT_SOURCE
glibc 2.19 and earlier:
_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 succes-
sive 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 */
};
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 er-
ror, errno is set to indicate the error.
ERRORS
ENOMEM Insufficient memory to allocate group structure.
ATTRIBUTES
For an explanation of the terms used in this section, see attributes(7).
┌───────────────────────────┬───────────────┬──────────────────────────┐
│ Interface │ Attribute │ Value │
├───────────────────────────┼───────────────┼──────────────────────────┤
│ fgetgrent() │ Thread safety │ MT-Unsafe race:fgetgrent │
└───────────────────────────┴───────────────┴──────────────────────────┘
STANDARDS
None.
HISTORY
SVr4.
SEE ALSO
endgrent(3), fgetgrent_r(3), fopen(3), getgrent(3), getgrgid(3), getgr-
nam(3), putgrent(3), setgrent(3), group(5)
Linux man-pages 6.9.1 2024-05-02 fgetgrent(3)
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