wuntraced
If you pass -1 and WNOHANG , waitpid() will check if any zombie-children exist. If yes, one of them is reaped and its exit status returned. If not, either 0 is returned (if unterminated children exist) or -1 is returned (if not) and ERRNO is set to ECHIL,WNOHANG：如果没有任何已经结束的子进程则马上返回, 不予以等待. WUNTRACED：如果子进程进入暂停执行情况则马上返回, 但结束状态不予以理会. 子进程的结束状态返回后存于status, 底下有几个宏可判别结束情况. WIFEXITED(status)：如果子进程正常结束则为非0 值. WEXITSTATUS(status)：取得子进程exit()返回的结束代码, ... ,Octave-Forge is a collection of packages providing extra functionality for GNU Octave. , 4. pid<-1时，等待一个指定进程组中的任何子进程，这个进程组的ID等于pid的绝对值。 options options提供了一些额外的选项来控制waitpid，目前在Linux中只支持WNOHANG和WUNTRACED两个选项，这是两个常数，可以用”|”运算符把它们连接起来使用，比如： ret=waitpid(-1,NULL,WNOHANG | WUNTRACED);,The options argument is a bit mask. Its value should be the bitwise OR (that is, the ' | ' operator) of zero or more of the WNOHANG and WUNTRACED flags. You can use the WNOHANG flag to indicate that the parent process shouldn't wait; and the W,If the information pointed to by stat_loc was stored by a call to waitpid() that did not specify the WUNTRACED flag and specified the WCONTINUED flag, or by a call to the wait() function, exactly one of the macros WIFEXITED(*stat_loc), WIFSIGNALED(*stat_l,ret=waitpid(-1,NULL,WNOHANG | WUNTRACED);. 如果我们不想使用它们，也可以把options设为0，如：. ret=waitpid(-1,NULL,0);. WNOHANG 若pid指定的子进程没有结束，则waitpid()函数返回0，不予以等待。若结束，则返回该子进程的ID。 WUNTRACED 若子进程进入暂停状态，则马上返回，但子进程的结束状态不予以理会。
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 wuntraced 相關參考資料
c - waitpid, wnohang, wuntraced. How do I use these - Stack Overflow
If you pass -1 and WNOHANG , waitpid() will check if any zombie-children exist. If yes, one of them is reaped and its exit status returned. If not, either 0 is returned (if unterminated children exis... https://stackoverflow.com C语言waitpid()函数：中断(结束)进程函数(等待子进程中断或_C语言中文网
WNOHANG：如果没有任何已经结束的子进程则马上返回, 不予以等待. WUNTRACED：如果子进程进入暂停执行情况则马上返回, 但结束状态不予以理会. 子进程的结束状态返回后存于status, 底下有几个宏可判别结束情况. WIFEXITED(status)：如果子进程正常结束则为非0 值. WEXITSTATUS(status)：取得子进程exit()返回的结束代码, ... http://c.biancheng.net Function Reference: WUNTRACED - Octave-Forge
Octave-Forge is a collection of packages providing extra functionality for GNU Octave. https://octave.sourceforge.io linux中waitpid系统调用- JamesDing - 博客园
4. pid<-1时，等待一个指定进程组中的任何子进程，这个进程组的ID等于pid的绝对值。 options options提供了一些额外的选项来控制waitpid，目前在Linux中只支持WNOHANG和WUNTRACED两个选项，这是两个常数，可以用”|”运算符把它们连接起来使用，比如： ret=waitpid(-1,NULL,WNOHANG | WUNTRACED); http://www.cnblogs.com Process Completion (The GNU C Library) - GNU.org
The options argument is a bit mask. Its value should be the bitwise OR (that is, the ' | ' operator) of zero or more of the WNOHANG and WUNTRACED flags. You can use the WNOHANG flag to indicat... https://www.gnu.org waitpid(3) - Linux man page
If the information pointed to by stat_loc was stored by a call to waitpid() that did not specify the WUNTRACED flag and specified the WCONTINUED flag, or by a call to the wait() function, exactly one ... https://linux.die.net waitpid_百度百科
ret=waitpid(-1,NULL,WNOHANG | WUNTRACED);. 如果我们不想使用它们，也可以把options设为0，如：. ret=waitpid(-1,NULL,0);. WNOHANG 若pid指定的子进程没有结束，则waitpid()函数返回0，不予以等待。若结束，则返回该子进程的ID。 WUNTRACED 若子进程进入暂停状态，则马上返回，但子进程的结束状态不予以理会... https://baike.baidu.com |