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glibc/sysdeps/unix/sysv/linux/nscd_setup_thread.c
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/* Setup of nscd worker threads. Linux verison. | |
Copyright (C) 2004-2016 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
Contributed by Ulrich Drepper <drepper@redhat.com>, 2004. | |
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 <http://www.gnu.org/licenses/>. */ | |
#include <string.h> | |
#include <unistd.h> | |
#include <nscd.h> | |
#include <sysdep.h> | |
int | |
setup_thread (struct database_dyn *db) | |
{ | |
#ifdef __NR_set_tid_address | |
/* 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. */ | |
INTERNAL_SYSCALL_DECL (err); | |
int r = INTERNAL_SYSCALL (set_tid_address, err, 1, | |
&db->head->nscd_certainly_running); | |
if (!INTERNAL_SYSCALL_ERROR_P (r, err)) | |
/* 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; | |
#endif | |
return 0; | |
} |