1 /*
2 * Copyright (c) 2014 The DragonFly Project. All rights reserved.
3 *
4 * This code is derived from software contributed to The DragonFly Project
5 * by Matthew Dillon <dillon@backplane.com>
6 *
7 * Redistribution and use in source and binary forms, with or without
8 * modification, are permitted provided that the following conditions
9 * are met:
10 *
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in
15 * the documentation and/or other materials provided with the
16 * distribution.
17 * 3. Neither the name of The DragonFly Project nor the names of its
18 * contributors may be used to endorse or promote products derived
19 * from this software without specific, prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
22 * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
23 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
24 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
25 * COPYRIGHT HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
26 * INCIDENTAL, SPECIAL, EXEMPLARY OR CONSEQUENTIAL DAMAGES (INCLUDING,
27 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
28 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
29 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
30 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
31 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32 * SUCH DAMAGE.
33 */
34
35 #include <sys/cdefs.h>
36 #include <sys/types.h>
37 #include <sys/syscall.h>
38 #include <sys/upmap.h>
39 #include <sys/time.h>
40 #include <machine/cpufunc.h>
41 #include <errno.h>
42 #include <time.h>
43 #include <stdio.h>
44 #include <unistd.h>
45 /*#include "un-namespace.h"*/
46 #include "libc_private.h"
47 #include "upmap.h"
48
49 extern pid_t __sys_getpid(void);
50 int __getpid(void);
51
52 static int fast_getpid_state;
53 static int fast_getpid_count;
54 static pid_t *pidp;
55 static int *invforkp;
56
57 /*
58 * Optimize getpid() if it is called a lot. We have to be careful when
59 * getpid() is called in a vfork child prior to exec as the shared area
60 * is still the parent's shared area.
61 */
62 pid_t
__getpid(void)63 __getpid(void)
64 {
65 if (fast_getpid_state == 0 && fast_getpid_count++ >= 10) {
66 __upmap_map(&pidp, &fast_getpid_state, UPTYPE_PID);
67 __upmap_map(&invforkp, &fast_getpid_state, UPTYPE_INVFORK);
68 __upmap_map(NULL, &fast_getpid_state, 0);
69 }
70 if (fast_getpid_state > 0 && *invforkp == 0)
71 return(*pidp);
72 else
73 return(__sys_getpid());
74 }
75
76 __weak_reference(__getpid, getpid);
77
78 #if 0 /* DEBUG */
79 pid_t xxx_getpid(void);
80
81 pid_t
82 xxx_getpid(void)
83 {
84 return(__sys_getpid());
85 }
86 #endif
87