| .\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk) |
| .\" |
| .\" %%%LICENSE_START(VERBATIM) |
| .\" Permission is granted to make and distribute verbatim copies of this |
| .\" manual provided the copyright notice and this permission notice are |
| .\" preserved on all copies. |
| .\" |
| .\" Permission is granted to copy and distribute modified versions of this |
| .\" manual under the conditions for verbatim copying, provided that the |
| .\" entire resulting derived work is distributed under the terms of a |
| .\" permission notice identical to this one. |
| .\" |
| .\" Since the Linux kernel and libraries are constantly changing, this |
| .\" manual page may be incorrect or out-of-date. The author(s) assume no |
| .\" responsibility for errors or omissions, or for damages resulting from |
| .\" the use of the information contained herein. The author(s) may not |
| .\" have taken the same level of care in the production of this manual, |
| .\" which is licensed free of charge, as they might when working |
| .\" professionally. |
| .\" |
| .\" Formatted or processed versions of this manual, if unaccompanied by |
| .\" the source, must acknowledge the copyright and authors of this work. |
| .\" %%%LICENSE_END |
| .\" |
| .\" References consulted: |
| .\" Linux libc source code |
| .\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991) |
| .\" 386BSD man pages |
| .\" Modified Sat Jul 24 19:38:44 1993 by Rik Faith (faith@cs.unc.edu) |
| .TH FGETGRENT 3 2017-09-15 "GNU" "Linux Programmer's Manual" |
| .SH NAME |
| fgetgrent \- get group file entry |
| .SH SYNOPSIS |
| .nf |
| .B #include <stdio.h> |
| .B #include <sys/types.h> |
| .B #include <grp.h> |
| .PP |
| .BI "struct group *fgetgrent(FILE *" stream ); |
| .fi |
| .PP |
| .in -4n |
| Feature Test Macro Requirements for glibc (see |
| .BR feature_test_macros (7)): |
| .in |
| .PP |
| .BR fgetgrent (): |
| Since glibc 2.19: |
| _DEFAULT_SOURCE |
| Glibc 2.19 and earlier: |
| _SVID_SOURCE |
| .SH DESCRIPTION |
| The |
| .BR fgetgrent () |
| function returns a pointer to a structure containing |
| the group information from the file referred to by |
| .IR stream . |
| The first time it is called |
| it returns the first entry; thereafter, it returns successive entries. |
| The file referred to by |
| .I stream |
| must have the same format as |
| .I /etc/group |
| (see |
| .BR group (5)). |
| .PP |
| The \fIgroup\fP structure is defined in \fI<grp.h>\fP as follows: |
| .PP |
| .in +4n |
| .EX |
| 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 */ |
| }; |
| .EE |
| .in |
| .SH RETURN VALUE |
| The |
| .BR fgetgrent () |
| function returns a pointer to a |
| .I group |
| structure, |
| or NULL if there are no more entries or an error occurs. |
| In the event of an error, |
| .I errno |
| is set to indicate the cause. |
| .SH ERRORS |
| .TP |
| .B ENOMEM |
| Insufficient memory to allocate |
| .I group |
| structure. |
| .SH ATTRIBUTES |
| For an explanation of the terms used in this section, see |
| .BR attributes (7). |
| .TS |
| allbox; |
| lb lb lb |
| l l l. |
| Interface Attribute Value |
| T{ |
| .BR fgetgrent () |
| T} Thread safety MT-Unsafe race:fgetgrent |
| .TE |
| .\" FIXME The marking is different from that in the glibc manual, |
| .\" which has: |
| .\" |
| .\" fgetgrent: MT-Unsafe race:fgrent |
| .\" |
| .\" We think race:fgrent in glibc may be hard for users to understand, |
| .\" and have sent a patch to the GNU libc community for changing it to |
| .\" race:fgetgrent, however, something about the copyright impeded the |
| .\" progress. |
| .SH CONFORMING TO |
| SVr4. |
| .SH SEE ALSO |
| .BR endgrent (3), |
| .BR fgetgrent_r (3), |
| .BR fopen (3), |
| .BR getgrent (3), |
| .BR getgrgid (3), |
| .BR getgrnam (3), |
| .BR putgrent (3), |
| .BR setgrent (3), |
| .BR group (5) |