mirror of https://github.com/mkerrisk/man-pages
129 lines
3.5 KiB
Groff
129 lines
3.5 KiB
Groff
.\" Copyright 1993 David Metcalfe (david@prism.demon.co.uk)
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.\"
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.\" %%%LICENSE_START(VERBATIM)
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.\" Permission is granted to make and distribute verbatim copies of this
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.\" manual provided the copyright notice and this permission notice are
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.\" preserved on all copies.
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.\"
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.\" Permission is granted to copy and distribute modified versions of this
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.\" manual under the conditions for verbatim copying, provided that the
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.\" entire resulting derived work is distributed under the terms of a
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.\" permission notice identical to this one.
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.\"
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.\" Since the Linux kernel and libraries are constantly changing, this
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.\" manual page may be incorrect or out-of-date. The author(s) assume no
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.\" responsibility for errors or omissions, or for damages resulting from
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.\" the use of the information contained herein. The author(s) may not
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.\" have taken the same level of care in the production of this manual,
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.\" which is licensed free of charge, as they might when working
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.\" professionally.
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.\"
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.\" Formatted or processed versions of this manual, if unaccompanied by
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.\" the source, must acknowledge the copyright and authors of this work.
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.\" %%%LICENSE_END
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.\"
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.\" References consulted:
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.\" Linux libc source code
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.\" Lewine's _POSIX Programmer's Guide_ (O'Reilly & Associates, 1991)
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.\" 386BSD man pages
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.\" Modified Sat Jul 24 19:38:44 1993 by Rik Faith (faith@cs.unc.edu)
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.TH FGETGRENT 3 2016-03-15 "GNU" "Linux Programmer's Manual"
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.SH NAME
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fgetgrent \- get group file entry
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.SH SYNOPSIS
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.nf
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.B #include <stdio.h>
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.B #include <sys/types.h>
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.B #include <grp.h>
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.sp
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.BI "struct group *fgetgrent(FILE *" stream );
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.fi
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.sp
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.in -4n
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Feature Test Macro Requirements for glibc (see
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.BR feature_test_macros (7)):
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.in
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.sp
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.BR fgetgrent ():
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Since glibc 2.19:
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_DEFAULT_SOURCE
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Glibc 2.19 and earlier:
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_SVID_SOURCE
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.SH DESCRIPTION
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The
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.BR fgetgrent ()
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function returns a pointer to a structure containing
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the group information from the file referred to by
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.IR stream .
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The first time it is called
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it returns the first entry; thereafter, it returns successive entries.
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The file referred to by
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.I stream
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must have the same format as
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.I /etc/group
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(see
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.BR group (5)).
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.PP
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The \fIgroup\fP structure is defined in \fI<grp.h>\fP as follows:
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.sp
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.in +4n
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.nf
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struct group {
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char *gr_name; /* group name */
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char *gr_passwd; /* group password */
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gid_t gr_gid; /* group ID */
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char **gr_mem; /* NULL-terminated array of pointers
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to names of group members */
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};
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.fi
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.in
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.SH RETURN VALUE
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The
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.BR fgetgrent ()
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function returns a pointer to a
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.I group
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structure,
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or NULL if there are no more entries or an error occurs.
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In the event of an error,
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.I errno
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is set to indicate the cause.
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.SH ERRORS
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.TP
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.B ENOMEM
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Insufficient memory to allocate
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.I group
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structure.
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.SH ATTRIBUTES
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For an explanation of the terms used in this section, see
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.BR attributes (7).
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.TS
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allbox;
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lb lb lb
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l l l.
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Interface Attribute Value
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T{
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.BR fgetgrent ()
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T} Thread safety MT-Unsafe race:fgetgrent
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.TE
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.\" FIXME The marking is different from that in the glibc manual,
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.\" which has:
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.\"
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.\" fgetgrent: MT-Unsafe race:fgrent
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.\"
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.\" We think race:fgrent in glibc may be hard for users to understand,
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.\" and have sent a patch to the GNU libc community for changing it to
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.\" race:fgetgrent, however, something about the copyright impeded the
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.\" progress.
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.SH CONFORMING TO
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SVr4.
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.SH SEE ALSO
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.BR endgrent (3),
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.BR fgetgrent_r (3),
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.BR fopen (3),
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.BR getgrent (3),
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.BR getgrgid (3),
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.BR getgrnam (3),
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.BR putgrent (3),
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.BR setgrent (3),
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.BR group (5)
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