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<a name='TOP'><h2><a href='../mains.html'>root</a>/<a href='../files/99.html'>include</a>/<a href='../files/102.html'>sys</a>/wait.h</h2>
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<h2><a href='../J/47.html' title='Multiple included from 2 places.'>INCLUDED FROM</a></h2>
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<a name='L1'><font color='darkred'>#ifndef</font> <a href='../S/47.html#L2' title='Defined at 2 in include/sys/wait.h.'>_SYS_WAIT_H</a>
<a name='L2'><font color='darkred'>#define</font> <a href='../S/47.html#L1' title='Refered from 1 in include/sys/wait.h.'>_SYS_WAIT_H</a>
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<a name='L4'><font color='darkred'>#include</font> <<a href='45.html'>sys/types.h</a>>
<a name='L5'>
<a name='L6'><font color='darkred'>#define</font> _LOW(v) ( (v) & 0377) <i><font color='green'>// 取低字节（8 进制表示）。</font></i>
<a name='L7'><font color='darkred'>#define</font> _HIGH(v) ( ((v) >> 8) & 0377) <i><font color='green'>// 取高字节。</font></i>
<a name='L8'>
<a name='L9'><i><font color='green'>/* options for waitpid, WUNTRACED not supported */</font></i>
<a name='L10'><i><font color='green'>/* waitpid 的选项，其中WUNTRACED 未被支持 */</font></i>
<a name='L11'><font color='darkred'>#define</font> <a href='../S/67.html#L254' title='Refered from 254 in kernel/exit.c.'>WNOHANG</a> 1 <i><font color='green'>// 如果没有状态也不要挂起，并立刻返回。</font></i>
<a name='L12'><font color='darkred'>#define</font> <a href='../S/67.html#L235' title='Refered from 235 in kernel/exit.c.'>WUNTRACED</a> 2 <i><font color='green'>// 报告停止执行的子进程状态。</font></i>
<a name='L13'>
<a name='L14'><font color='darkred'>#define</font> WIFEXITED(s) (!((s)&0xFF) <i><font color='green'>// 如果子进程正常退出，则为真。</font></i>
<a name='L15'><font color='darkred'>#define</font> WIFSTOPPED(s) (((s)&0xFF)==0x7F) <i><font color='green'>// 如果子进程正停止着，则为true。</font></i>
<a name='L16'><font color='darkred'>#define</font> WEXITSTATUS(s) (((s)>>8)&0xFF) <i><font color='green'>// 返回退出状态。</font></i>
<a name='L17'><font color='darkred'>#define</font> WTERMSIG(s) ((s)&0x7F) <i><font color='green'>// 返回导致进程终止的信号值（信号量）。</font></i>
<a name='L18'><font color='darkred'>#define</font> WSTOPSIG(s) (((s)>>8)&0xFF) <i><font color='green'>// 返回导致进程停止的信号值。</font></i>
<a name='L19'><font color='darkred'>#define</font> WIFSIGNALED(s) (((<b>unsigned</b> <b>int</b>)(s)-1 & 0xFFFF) < 0xFF) <i><font color='green'>// 如果由于未捕捉到信号</font></i>
<a name='L20'><i><font color='green'>// 而导致子进程退出则为真。</font></i>
<a name='L21'>
<a name='L22'><i><font color='green'>// wait()和waitpit()函数允许进程获取与其子进程之一的状态信息。各种选项允许获取已经终止或</font></i>
<a name='L23'><i><font color='green'>// 停止的子进程状态信息。如果存在两个或两个以上子进程的状态信息，则报告的顺序是不指定的。</font></i>
<a name='L24'><i><font color='green'>// wait()将挂起当前进程，直到其子进程之一退出（终止），或者收到要求终止该进程的信号，</font></i>
<a name='L25'><i><font color='green'>// 或者是需要调用一个信号句柄（信号处理程序）。</font></i>
<a name='L26'><i><font color='green'>// waitpid()挂起当前进程，直到pid 指定的子进程退出（终止）或者收到要求终止该进程的信号，</font></i>
<a name='L27'><i><font color='green'>// 或者是需要调用一个信号句柄（信号处理程序）。</font></i>
<a name='L28'><i><font color='green'>// 如果pid= -1，options=0，则waitpid()的作用与wait()函数一样。否则其行为将随pid 和options</font></i>
<a name='L29'><i><font color='green'>// 参数的不同而不同。（参见kernel/exit.c,142）</font></i>
<a name='L30'><a href='../S/45.html#L23' title='Defined at 23 in include/sys/types.h.'>pid_t</a> wait (<b>int</b> *stat_loc);
<a name='L31'><a href='../S/45.html#L23' title='Defined at 23 in include/sys/types.h.'>pid_t</a> waitpid (<a href='../S/45.html#L23' title='Defined at 23 in include/sys/types.h.'>pid_t</a> pid, <b>int</b> *stat_loc, <b>int</b> options);
<a name='L32'>
<a name='L33'><font color='darkred'>#endif</font>
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