1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
/* Copyright (C) 2003-2014 Free Software Foundation, Inc.
This file is part of the GNU C Library.
Contributed by Ulrich Drepper <drepper@redhat.com>, 2003.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<http://www.gnu.org/licenses/>. */
#include <unistd.h>
#include <tls.h>
#include <sysdep.h>
#ifndef NOT_IN_libc
static inline __attribute__((always_inline)) pid_t really_getpid (pid_t oldval);
static inline __attribute__((always_inline)) pid_t
really_getpid (pid_t oldval)
{
if (__glibc_likely (oldval == 0))
{
pid_t selftid = THREAD_GETMEM (THREAD_SELF, tid);
if (__glibc_likely (selftid != 0))
return selftid;
}
INTERNAL_SYSCALL_DECL (err);
pid_t result = INTERNAL_SYSCALL (getpid, err, 0);
/* We do not set the PID field in the TID here since we might be
called from a signal handler while the thread executes fork. */
if (oldval == 0)
THREAD_SETMEM (THREAD_SELF, tid, result);
return result;
}
#endif
pid_t
__getpid (void)
{
#ifdef NOT_IN_libc
INTERNAL_SYSCALL_DECL (err);
pid_t result = INTERNAL_SYSCALL (getpid, err, 0);
#else
pid_t result = THREAD_GETMEM (THREAD_SELF, pid);
if (__glibc_unlikely (result <= 0))
result = really_getpid (result);
#endif
return result;
}
libc_hidden_def (__getpid)
weak_alias (__getpid, getpid)
libc_hidden_def (getpid)
|
