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  * Copyright (c) 1982, 1986, 1989, 1993, 1994
    3  *      The Regents of the University of California.  All rights reserved.
    4  *
    5  * Redistribution and use in source and binary forms, with or without
    6  * modification, are permitted provided that the following conditions
    7  * are met:
    8  * 1. Redistributions of source code must retain the above copyright
    9  *    notice, this list of conditions and the following disclaimer.
   10  * 2. Redistributions in binary form must reproduce the above copyright
   11  *    notice, this list of conditions and the following disclaimer in the
   12  *    documentation and/or other materials provided with the distribution.
   13  * 4. Neither the name of the University nor the names of its contributors
   14  *    may be used to endorse or promote products derived from this software
   15  *    without specific prior written permission.
   16  *
   17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
   18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
   19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
   20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
   21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
   22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
   23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
   24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
   25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
   26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
   27  * SUCH DAMAGE.
   28  *
   29  *      @(#)wait.h      8.2 (Berkeley) 7/10/94
   30  * $FreeBSD: releng/11.1/sys/sys/wait.h 285670 2015-07-18 09:02:50Z kib $
   31  */
   32 
   33 #ifndef _SYS_WAIT_H_
   34 #define _SYS_WAIT_H_
   35 
   36 #include <sys/cdefs.h>
   37 
   38 /*
   39  * This file holds definitions relevant to the wait4 system call and the
   40  * alternate interfaces that use it (wait, wait3, waitpid).
   41  */
   42 
   43 /*
   44  * Macros to test the exit status returned by wait and extract the relevant
   45  * values.
   46  */
   47 #if __BSD_VISIBLE
   48 #define WCOREFLAG       0200
   49 #endif
   50 #define _W_INT(i)       (i)
   51 
   52 #define _WSTATUS(x)     (_W_INT(x) & 0177)
   53 #define _WSTOPPED       0177            /* _WSTATUS if process is stopped */
   54 #define WIFSTOPPED(x)   (_WSTATUS(x) == _WSTOPPED)
   55 #define WSTOPSIG(x)     (_W_INT(x) >> 8)
   56 #define WIFSIGNALED(x)  (_WSTATUS(x) != _WSTOPPED && _WSTATUS(x) != 0 && (x) != 0x13)
   57 #define WTERMSIG(x)     (_WSTATUS(x))
   58 #define WIFEXITED(x)    (_WSTATUS(x) == 0)
   59 #define WEXITSTATUS(x)  (_W_INT(x) >> 8)
   60 #define WIFCONTINUED(x) (x == 0x13)     /* 0x13 == SIGCONT */
   61 #if __BSD_VISIBLE
   62 #define WCOREDUMP(x)    (_W_INT(x) & WCOREFLAG)
   63 
   64 #define W_EXITCODE(ret, sig)    ((ret) << 8 | (sig))
   65 #define W_STOPCODE(sig)         ((sig) << 8 | _WSTOPPED)
   66 #endif
   67 
   68 /*
   69  * Option bits for the third argument of wait4.  WNOHANG causes the
   70  * wait to not hang if there are no stopped or terminated processes, rather
   71  * returning an error indication in this case (pid==0).  WUNTRACED
   72  * indicates that the caller should receive status about untraced children
   73  * which stop due to signals.  If children are stopped and a wait without
   74  * this option is done, it is as though they were still running... nothing
   75  * about them is returned. WNOWAIT only request information about zombie,
   76  * leaving the proc around, available for later waits.
   77  */
   78 #define WNOHANG         1       /* Don't hang in wait. */
   79 #define WUNTRACED       2       /* Tell about stopped, untraced children. */
   80 #define WSTOPPED        WUNTRACED   /* SUS compatibility */
   81 #define WCONTINUED      4       /* Report a job control continued process. */
   82 #define WNOWAIT         8       /* Poll only. Don't delete the proc entry. */
   83 #define WEXITED         16      /* Wait for exited processes. */
   84 #define WTRAPPED        32      /* Wait for a process to hit a trap or
   85                                    a breakpoint. */
   86 
   87 #if __BSD_VISIBLE
   88 #define WLINUXCLONE 0x80000000  /* Wait for kthread spawned from linux_clone. */
   89 #endif
   90 
   91 #ifndef _IDTYPE_T_DECLARED
   92 typedef enum
   93 #if __BSD_VISIBLE
   94         idtype          /* pollutes XPG4.2 namespace */
   95 #endif
   96                 {
   97         /*
   98          * These names were mostly lifted from Solaris source code and
   99          * still use Solaris style naming to avoid breaking any
  100          * OpenSolaris code which has been ported to FreeBSD.  There
  101          * is no clear FreeBSD counterpart for all of the names, but
  102          * some have a clear correspondence to FreeBSD entities.
  103          *
  104          * The numerical values are kept synchronized with the Solaris
  105          * values.
  106          */
  107         P_PID,                  /* A process identifier. */
  108         P_PPID,                 /* A parent process identifier. */
  109         P_PGID,                 /* A process group identifier. */
  110         P_SID,                  /* A session identifier. */
  111         P_CID,                  /* A scheduling class identifier. */
  112         P_UID,                  /* A user identifier. */
  113         P_GID,                  /* A group identifier. */
  114         P_ALL,                  /* All processes. */
  115         P_LWPID,                /* An LWP identifier. */
  116         P_TASKID,               /* A task identifier. */
  117         P_PROJID,               /* A project identifier. */
  118         P_POOLID,               /* A pool identifier. */
  119         P_JAILID,               /* A zone identifier. */
  120         P_CTID,                 /* A (process) contract identifier. */
  121         P_CPUID,                /* CPU identifier. */
  122         P_PSETID                /* Processor set identifier. */
  123 } idtype_t;                     /* The type of id_t we are using. */
  124 
  125 #if __BSD_VISIBLE
  126 #define P_ZONEID        P_JAILID
  127 #endif
  128 #define _IDTYPE_T_DECLARED
  129 #endif
  130 
  131 /*
  132  * Tokens for special values of the "pid" parameter to wait4.
  133  * Extended struct __wrusage to collect rusage for both the target
  134  * process and its children within one wait6() call.
  135  */
  136 #if __BSD_VISIBLE
  137 #define WAIT_ANY        (-1)    /* any process */
  138 #define WAIT_MYPGRP     0       /* any process in my process group */
  139 #endif /* __BSD_VISIBLE */
  140 
  141 #if defined(_KERNEL) || defined(_WANT_KW_EXITCODE)
  142 
  143 /*
  144  * Clamp the return code to the low 8 bits from full 32 bit value.
  145  * Should be used in kernel to construct the wait(2)-compatible process
  146  * status to usermode.
  147  */
  148 #define KW_EXITCODE(ret, sig)   W_EXITCODE((ret) & 0xff, (sig))
  149 
  150 #endif  /* _KERNEL || _WANT_KW_EXITCODE */
  151 
  152 #ifndef _KERNEL
  153 
  154 #include <sys/types.h>
  155 
  156 __BEGIN_DECLS
  157 struct __siginfo;
  158 pid_t   wait(int *);
  159 pid_t   waitpid(pid_t, int *, int);
  160 #if __POSIX_VISIBLE >= 200112
  161 int     waitid(idtype_t, id_t, struct __siginfo *, int);
  162 #endif
  163 #if __BSD_VISIBLE
  164 struct rusage;
  165 struct __wrusage;
  166 pid_t   wait3(int *, int, struct rusage *);
  167 pid_t   wait4(pid_t, int *, int, struct rusage *);
  168 pid_t   wait6(idtype_t, id_t, int *, int, struct __wrusage *,
  169             struct __siginfo *);
  170 #endif
  171 __END_DECLS
  172 #endif /* !_KERNEL */
  173 
  174 #endif /* !_SYS_WAIT_H_ */

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