pcntl_wifexited 总是返回 true
好吧，子进程可能会因错误退出，但 pcntl_wifexited 总是返回 true
<?php
//Sample code :
$child_pid = pcntl_fork();
if ($child_pid === 0)
{
//This is child process
$my_var = rand(1,5);
if($my_var == 2)
{
//2 is not allowed
exit(1); //exit with error
}
if($my_var == 4)
{
//4 is unknown
i_crash_now(); //crash
}
echo 'end of child' . "\n";
exit(0); //exit standard
}
else
{
sleep(1); //waiting for child with ninja code (don't do that at home, this was made by professional ninjas)
pcntl_waitpid($child_pid, $status, WNOHANG);
var_dump(pcntl_wstopsig($status)); //in case 2 > 1, in case 4 > 255, else 0
var_dump(pcntl_wifexited($status)); //always true;
}
exit(0);
我可以使用信号来查找错误，但我不明白 pcntl_wifexited() 有什么问题。
这与 WNOHANG 选项有关吗？
Well the child process may exit with error but pcntl_wifexited always return true
<?php
//Sample code :
$child_pid = pcntl_fork();
if ($child_pid === 0)
{
//This is child process
$my_var = rand(1,5);
if($my_var == 2)
{
//2 is not allowed
exit(1); //exit with error
}
if($my_var == 4)
{
//4 is unknown
i_crash_now(); //crash
}
echo 'end of child' . "\n";
exit(0); //exit standard
}
else
{
sleep(1); //waiting for child with ninja code (don't do that at home, this was made by professional ninjas)
pcntl_waitpid($child_pid, $status, WNOHANG);
var_dump(pcntl_wstopsig($status)); //in case 2 > 1, in case 4 > 255, else 0
var_dump(pcntl_wifexited($status)); //always true;
}
exit(0);
I may use the signal to find errors, but I don't get what's wrong with pcntl_wifexited().
Is this related to WNOHANG option?
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我想 pcntl_waitpid 的行为与正常的 waitpid 调用类似。
如果没有进程终止，WNOHANG 会强制 waitpid 返回 0 [类似于零超时]。
因此，退出代码看起来是正常的。
I imagine the pcntl_waitpid behaves similarly to the normal waitpid call.
WNOHANG forces waitpid to return 0 if no process is terminated [it's akin to a zero timeout].
Hence, exit code will appear to be normal.