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31 * @(#)wait.h 8.2 (Berkeley) 7/10/94
38 #include <sys/cdefs.h>
41 * This file holds definitions relevant to the wait4 system call and the
42 * alternate interfaces that use it (wait, wait3, waitpid).
46 * Macros to test the exit status returned by wait and extract the relevant
50 #define WCOREFLAG 0200
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 */
64 #define WCOREDUMP(x) (_W_INT(x) & WCOREFLAG)
66 #define W_EXITCODE(ret, sig) ((ret) << 8 | (sig))
67 #define W_STOPCODE(sig) ((sig) << 8 | _WSTOPPED)
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.
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
90 #define WLINUXCLONE 0x80000000 /* Wait for kthread spawned from linux_clone. */
93 #ifndef _IDTYPE_T_DECLARED
96 idtype /* pollutes XPG4.2 namespace */
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.
106 * The numerical values are kept synchronized with the Solaris
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. */
128 #define P_ZONEID P_JAILID
130 #define _IDTYPE_T_DECLARED
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.
139 #define WAIT_ANY (-1) /* any process */
140 #define WAIT_MYPGRP 0 /* any process in my process group */
141 #endif /* __BSD_VISIBLE */
143 #if defined(_KERNEL) || defined(_WANT_KW_EXITCODE)
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.
150 #define KW_EXITCODE(ret, sig) W_EXITCODE((ret) & 0xff, (sig))
152 #endif /* _KERNEL || _WANT_KW_EXITCODE */
156 #include <sys/types.h>
161 pid_t waitpid(pid_t, int *, int);
162 #if __POSIX_VISIBLE >= 200112
163 int waitid(idtype_t, id_t, struct __siginfo *, int);
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 *,
174 #endif /* !_KERNEL */
176 #endif /* !_SYS_WAIT_H_ */