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fgetgrent(3) — Linux manual page

fgetgrent(3)             Library Functions Manualfgetgrent(3)

NAME        top

       fgetgrent - get group file entry

LIBRARY        top

       Standard C library (libc,-lc)

SYNOPSIS        top

#include <stdio.h>#include <sys/types.h>#include <grp.h>struct group *fgetgrent(FILE *stream);   Feature Test Macro Requirements for glibc (seefeature_test_macros(7)):fgetgrent():           Since glibc 2.19:               _DEFAULT_SOURCE           glibc 2.19 and earlier:               _SVID_SOURCE

DESCRIPTION        top

       Thefgetgrent() function returns a pointer to a structure       containing the group information from the file referred to bystream.  The first time it is called it returns the first entry;       thereafter, it returns successive entries.  The file referred to       bystream must have the same format as/etc/group (seegroup(5)).       Thegroup 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        top

       Thefgetgrent() function returns a pointer to agroup 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.

ERRORS        top

ENOMEMInsufficient memory to allocategroup structure.

ATTRIBUTES        top

       For an explanation of the terms used in this section, seeattributes(7).       ┌─────────────────────┬───────────────┬──────────────────────────┐       │Interface│Attribute│Value│       ├─────────────────────┼───────────────┼──────────────────────────┤       │fgetgrent()         │ Thread safety │ MT-Unsafe race:fgetgrent │       └─────────────────────┴───────────────┴──────────────────────────┘

STANDARDS        top

       None.

HISTORY        top

       SVr4.

SEE ALSO        top

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

COLOPHON        top

       This page is part of theman-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-6.15.tar.gz       fetched from       ⟨https://mirrors.edge.kernel.org/pub/linux/docs/man-pages/⟩ on       2025-08-11.  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 isnot       part of the original manual page), send a mail to       man-pages@man7.orgLinux man-pages 6.15            2025-05-17fgetgrent(3)

Pages that refer to this page:getgrent(3), getgrent_r(3), getgrnam(3), putgrent(3)

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