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NAME | LIBRARY | SYNOPSIS | DESCRIPTION | RETURN VALUE | ERRORS | ATTRIBUTES | STANDARDS | HISTORY | SEE ALSO | COLOPHON |
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fgetgrent(3) Library Functions Manual fgetgrent(3)
fgetgrent - get group file entry
Standard C library (libc, -lc)
#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).
┌─────────────────────┬───────────────┬──────────────────────────┐
│ Interface │ Attribute │ Value │
├─────────────────────┼───────────────┼──────────────────────────┤
│ fgetgrent() │ Thread safety │ MT-Unsafe race:fgetgrent │
└─────────────────────┴───────────────┴──────────────────────────┘
None.
SVr4.
endgrent(3), fgetgrent_r(3), fopen(3), getgrent(3), getgrgid(3),
getgrnam(3), putgrent(3), setgrent(3), group(5)
This page is part of the man-pages (Linux kernel and C library
user-space interface documentation) project. Information about
the project can be found at
⟨https://www.kernel.org/doc/man-pages/⟩. If you have a bug report
for this manual page, see
⟨https://git.kernel.org/pub/scm/docs/man-pages/man-pages.git/tree/CONTRIBUTING⟩.
This page was obtained from the tarball man-pages-6.10.tar.gz
fetched from
⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on
2025-02-02. If you discover any rendering problems in this HTML
version of the page, or you believe there is a better or more up-
to-date source for the page, or you have corrections or
improvements to the information in this COLOPHON (which is not
part of the original manual page), send a mail to
man-pages@man7.org
Linux man-pages 6.10 2024-07-23 fgetgrent(3)
Pages that refer to this page: getgrent(3), getgrent_r(3), getgrnam(3), putgrent(3)
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HTML rendering created 2025-02-02 by Michael Kerrisk, author of The Linux Programming Interface. For details of in-depth Linux/UNIX system programming training courses that I teach, look here. Hosting by jambit GmbH. |
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