mirror of
https://sourceware.org/git/glibc.git
synced 2025-10-28 23:34:53 +03:00
46 lines
1.7 KiB
C
46 lines
1.7 KiB
C
/* Setup of nscd worker threads. Linux version.
|
|
Copyright (C) 2004-2024 Free Software Foundation, Inc.
|
|
This file is part of the GNU C Library.
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published
|
|
by the Free Software Foundation; version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, see <https://www.gnu.org/licenses/>. */
|
|
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <nscd.h>
|
|
#include <sysdep.h>
|
|
|
|
|
|
int
|
|
setup_thread (struct database_dyn *db)
|
|
{
|
|
/* Only supported when NPTL is used. */
|
|
char buf[100];
|
|
if (confstr (_CS_GNU_LIBPTHREAD_VERSION, buf, sizeof (buf)) >= sizeof (buf)
|
|
|| strncmp (buf, "NPTL", 4) != 0)
|
|
return 0;
|
|
|
|
/* Do not try this at home, kids. We play with the SETTID address
|
|
even thought the process is multi-threaded. This can only work
|
|
since none of the threads ever terminates. */
|
|
int r = INTERNAL_SYSCALL_CALL (set_tid_address,
|
|
&db->head->nscd_certainly_running);
|
|
if (!INTERNAL_SYSCALL_ERROR_P (r))
|
|
/* We know the kernel can reset this field when nscd terminates.
|
|
So, set the field to a nonzero value which indicates that nscd
|
|
is certainly running and clients can skip the test. */
|
|
return db->head->nscd_certainly_running = 1;
|
|
|
|
return 0;
|
|
}
|