The Design and Implementation of the FreeBSD Operating System, Second Edition
Now available: The Design and Implementation of the FreeBSD Operating System (Second Edition)


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FreeBSD/Linux Kernel Cross Reference
sys/sys/wait.h

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 1982, 1986, 1989, 1993, 1994
    5  *      The Regents of the University of California.  All rights reserved.
    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  * 1. Redistributions of source code must retain the above copyright
   11  *    notice, this list of conditions and the following disclaimer.
   12  * 2. Redistributions in binary form must reproduce the above copyright
   13  *    notice, this list of conditions and the following disclaimer in the
   14  *    documentation and/or other materials provided with the distribution.
   15  * 3. Neither the name of the University nor the names of its contributors
   16  *    may be used to endorse or promote products derived from this software
   17  *    without specific prior written permission.
   18  *
   19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   29  * SUCH DAMAGE.
   30  *
   31  *      @(#)wait.h      8.2 (Berkeley) 7/10/94
   32  * $FreeBSD: stable/12/sys/sys/wait.h 326023 2017-11-20 19:43:44Z pfg $
   33  */
   34 
   35 #ifndef _SYS_WAIT_H_
   36 #define _SYS_WAIT_H_
   37 
   38 #include <sys/cdefs.h>
   39 
   40 /*
   41  * This file holds definitions relevant to the wait4 system call and the
   42  * alternate interfaces that use it (wait, wait3, waitpid).
   43  */
   44 
   45 /*
   46  * Macros to test the exit status returned by wait and extract the relevant
   47  * values.
   48  */
   49 #if __BSD_VISIBLE
   50 #define WCOREFLAG       0200
   51 #endif
   52 #define _W_INT(i)       (i)
   53 
   54 #define _WSTATUS(x)     (_W_INT(x) & 0177)
   55 #define _WSTOPPED       0177            /* _WSTATUS if process is stopped */
   56 #define WIFSTOPPED(x)   (_WSTATUS(x) == _WSTOPPED)
   57 #define WSTOPSIG(x)     (_W_INT(x) >> 8)
   58 #define WIFSIGNALED(x)  (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0 && (x) != 0x13)
   59 #define WTERMSIG(x)     (_WSTATUS(x))
   60 #define WIFEXITED(x)    (_WSTATUS(x) == 0)
   61 #define WEXITSTATUS(x)  (_W_INT(x) >> 8)
   62 #define WIFCONTINUED(x) (x == 0x13)     /* 0x13 == SIGCONT */
   63 #if __BSD_VISIBLE
   64 #define WCOREDUMP(x)    (_W_INT(x) & WCOREFLAG)
   65 
   66 #define W_EXITCODE(ret, sig)    ((ret) << 8 | (sig))
   67 #define W_STOPCODE(sig)         ((sig) << 8 | _WSTOPPED)
   68 #endif
   69 
   70 /*
   71  * Option bits for the third argument of wait4.  WNOHANG causes the
   72  * wait to not hang if there are no stopped or terminated processes, rather
   73  * returning an error indication in this case (pid==0).  WUNTRACED
   74  * indicates that the caller should receive status about untraced children
   75  * which stop due to signals.  If children are stopped and a wait without
   76  * this option is done, it is as though they were still running... nothing
   77  * about them is returned. WNOWAIT only request information about zombie,
   78  * leaving the proc around, available for later waits.
   79  */
   80 #define WNOHANG         1       /* Don't hang in wait. */
   81 #define WUNTRACED       2       /* Tell about stopped, untraced children. */
   82 #define WSTOPPED        WUNTRACED   /* SUS compatibility */
   83 #define WCONTINUED      4       /* Report a job control continued process. */
   84 #define WNOWAIT         8       /* Poll only. Don't delete the proc entry. */
   85 #define WEXITED         16      /* Wait for exited processes. */
   86 #define WTRAPPED        32      /* Wait for a process to hit a trap or
   87                                    a breakpoint. */
   88 
   89 #if __BSD_VISIBLE
   90 #define WLINUXCLONE 0x80000000  /* Wait for kthread spawned from linux_clone. */
   91 #endif
   92 
   93 #ifndef _IDTYPE_T_DECLARED
   94 typedef enum
   95 #if __BSD_VISIBLE
   96         idtype          /* pollutes XPG4.2 namespace */
   97 #endif
   98                 {
   99         /*
  100          * These names were mostly lifted from Solaris source code and
  101          * still use Solaris style naming to avoid breaking any
  102          * OpenSolaris code which has been ported to FreeBSD.  There
  103          * is no clear FreeBSD counterpart for all of the names, but
  104          * some have a clear correspondence to FreeBSD entities.
  105          *
  106          * The numerical values are kept synchronized with the Solaris
  107          * values.
  108          */
  109         P_PID,                  /* A process identifier. */
  110         P_PPID,                 /* A parent process identifier. */
  111         P_PGID,                 /* A process group identifier. */
  112         P_SID,                  /* A session identifier. */
  113         P_CID,                  /* A scheduling class identifier. */
  114         P_UID,                  /* A user identifier. */
  115         P_GID,                  /* A group identifier. */
  116         P_ALL,                  /* All processes. */
  117         P_LWPID,                /* An LWP identifier. */
  118         P_TASKID,               /* A task identifier. */
  119         P_PROJID,               /* A project identifier. */
  120         P_POOLID,               /* A pool identifier. */
  121         P_JAILID,               /* A zone identifier. */
  122         P_CTID,                 /* A (process) contract identifier. */
  123         P_CPUID,                /* CPU identifier. */
  124         P_PSETID                /* Processor set identifier. */
  125 } idtype_t;                     /* The type of id_t we are using. */
  126 
  127 #if __BSD_VISIBLE
  128 #define P_ZONEID        P_JAILID
  129 #endif
  130 #define _IDTYPE_T_DECLARED
  131 #endif
  132 
  133 /*
  134  * Tokens for special values of the "pid" parameter to wait4.
  135  * Extended struct __wrusage to collect rusage for both the target
  136  * process and its children within one wait6() call.
  137  */
  138 #if __BSD_VISIBLE
  139 #define WAIT_ANY        (-1)    /* any process */
  140 #define WAIT_MYPGRP     0       /* any process in my process group */
  141 #endif /* __BSD_VISIBLE */
  142 
  143 #if defined(_KERNEL) || defined(_WANT_KW_EXITCODE)
  144 
  145 /*
  146  * Clamp the return code to the low 8 bits from full 32 bit value.
  147  * Should be used in kernel to construct the wait(2)-compatible process
  148  * status to usermode.
  149  */
  150 #define KW_EXITCODE(ret, sig)   W_EXITCODE((ret) & 0xff, (sig))
  151 
  152 #endif  /* _KERNEL || _WANT_KW_EXITCODE */
  153 
  154 #ifndef _KERNEL
  155 
  156 #include <sys/types.h>
  157 
  158 __BEGIN_DECLS
  159 struct __siginfo;
  160 pid_t   wait(int *);
  161 pid_t   waitpid(pid_t, int *, int);
  162 #if __POSIX_VISIBLE >= 200112
  163 int     waitid(idtype_t, id_t, struct __siginfo *, int);
  164 #endif
  165 #if __BSD_VISIBLE
  166 struct rusage;
  167 struct __wrusage;
  168 pid_t   wait3(int *, int, struct rusage *);
  169 pid_t   wait4(pid_t, int *, int, struct rusage *);
  170 pid_t   wait6(idtype_t, id_t, int *, int, struct __wrusage *,
  171             struct __siginfo *);
  172 #endif
  173 __END_DECLS
  174 #endif /* !_KERNEL */
  175 
  176 #endif /* !_SYS_WAIT_H_ */

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