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 __weak_reference(__getpid, getpid); 53 54 static int fast_getpid_state; 55 static int fast_getpid_count; 56 static pid_t *pidp; 57 static int *invforkp; 58 59 /* 60 * Optimize getpid() if it is called a lot. We have to be careful when 61 * getpid() is called in a vfork child prior to exec as the shared area 62 * is still the parent's shared area. 63 */ 64 pid_t 65 __getpid(void) 66 { 67 if (fast_getpid_state == 0 && fast_getpid_count++ >= 10) { 68 __upmap_map(&pidp, &fast_getpid_state, UPTYPE_PID); 69 __upmap_map(&invforkp, &fast_getpid_state, UPTYPE_INVFORK); 70 __upmap_map(NULL, &fast_getpid_state, 0); 71 } 72 if (fast_getpid_state > 0 && *invforkp == 0) 73 return(*pidp); 74 else 75 return(__sys_getpid()); 76 } 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