1 /*- 2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD 3 * 4 * Copyright (c) 2012 Jukka A. Ukkonen 5 * All rights reserved. 6 * 7 * This software was developed by Jukka Ukkonen for FreeBSD. 8 * 9 * Redistribution and use in source and binary forms, with or without 10 * modification, are permitted provided that the following conditions 11 * are met: 12 * 1. Redistributions of source code must retain the above copyright 13 * notice, this list of conditions and the following disclaimer. 14 * 2. Redistributions in binary form must reproduce the above copyright 15 * notice, this list of conditions and the following disclaimer in the 16 * documentation and/or other materials provided with the distribution. 17 * 18 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 19 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 20 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 21 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 22 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 23 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 24 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 25 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 26 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 27 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 28 * SUCH DAMAGE. 29 */ 30 31 #include <sys/cdefs.h> 32 #include "namespace.h" 33 #include <sys/types.h> 34 #include <sys/wait.h> 35 #include <stddef.h> 36 #include <string.h> 37 #include <signal.h> 38 #include <errno.h> 39 #include "un-namespace.h" 40 #include "libc_private.h" 41 42 int __waitid(idtype_t, id_t, siginfo_t *, int); 43 44 int 45 __waitid(idtype_t idtype, id_t id, siginfo_t *info, int flags) 46 { 47 int status; 48 pid_t ret; 49 50 ret = _wait6(idtype, id, &status, flags, NULL, info); 51 52 /* 53 * According to SUSv4, waitid() shall not return a PID when a 54 * process is found, but only 0. If a process was actually 55 * found, siginfo_t fields si_signo and si_pid will be 56 * non-zero. In case WNOHANG was set in the flags and no 57 * process was found those fields are set to zero using 58 * memset() below. 59 */ 60 if (ret == 0 && info != NULL) 61 memset(info, 0, sizeof(*info)); 62 else if (ret > 0) 63 ret = 0; 64 return (ret); 65 } 66 67 __weak_reference(__waitid, waitid); 68 __weak_reference(__waitid, _waitid); 69