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and are not widely available on other systems.
.sh notes
there is no file descriptor associated with the file stream
returned by these functions
(i.e.,
.br fileno (3)
will return an error if called on the returned stream).
.sh bugs
in glibc before version 2.7, seeking past the end of a stream created by
.br open_memstream ()
does not enlarge the buffer; instead the
.br fseek (3)
call fails, returning \-1.
.\" http://sourceware.org/bugzilla/show_bug.cgi?id=1996
.sh examples
see
.br fmemopen (3).
.sh see also
.br fmemopen (3),
.br fopen (3),
.br setbuf (3)
.sh colophon
this page is part of release 5.13 of the linux
.i man-pages
project.
a description of the project,
information about reporting bugs,
and the latest version of this page,
can be found at
\%https://www.kernel.org/doc/man\-pages/.
.so man3/strchr.3
.so man3/unlocked_stdio.3
.so man3/unlocked_stdio.3
.\" copyright 2003 walter harms ([email protected])
.\"
.\" %%%license_start(gpl_noversion_oneline)
.\" distributed under gpl
.\" %%%license_end
.\"
.th putgrent 3 2021-03-22 "gnu" "linux programmer's manual"
.sh name
putgrent \- write a group database entry to a file
.sh synopsis
.nf
.br "#define _gnu_source" " /* see feature_test_macros(7) */"
.b #include <grp.h>
.pp
.bi "int putgrent(const struct group *restrict " grp \
", file *restrict " stream );
.fi
.sh description
the
.br putgrent ()
function is the counterpart for
.br fgetgrent (3).
the function writes the content of the provided
.ir "struct group"
into the
.ir stream .
the list of group members must be null-terminated or null-initialized.
.pp
the
.ir "struct group"
is defined 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; /* group members */
};
.ee
.in
.sh return value
the function returns zero on success, and a nonzero value on error.
.sh attributes
for an explanation of the terms used in this section, see
.br attributes (7).
.ad l
.nh
.ts
allbox;
lbx lb lb
l l l.
interface attribute value
t{
.br putgrent ()
t} thread safety mt-safe
.te
.hy
.ad
.sp 1
.sh conforming to
this function is a gnu extension.