主要内容翻译自QNX开发文档，根据自己理解翻译，错误之处在所难免，目的还是提供给大家对照阅读，我自己也写了一些代码，抽空后继也会放上
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如果应用程序需要处理信号 (signal) ，你需要设置信号处理函数 (signal handler) 。你不能在信号处理函数中调用 Photon 函数的原因是由于 widget library 是非可重入和信号安全的。
为了绕开这个问题， Photon library 包含了一个信号处理函数，你注册一个信号处理函数后， Photon 会稍后调用：
l Photon 的 signal handler 返回
和
l 所有当前 widget 的处理都已完成
注意 ：当你使用这种信号处理方式，你将得不到严格的实时性，这是因为信号处理函数不是立即调用的。
1.1 Adding a signal-processing function
调用 PtAppAddSignalProc() 函数来添加信号处理函数，典型应用与：
l 应用程序初始化函数
或
l 某窗口的设置函数
需要包含 <signal.h> 文件。
PtAppAddSignalProc() 函数语法如下：
int PtAppAddSignalProc( PtAppContext_t app,
sigset_t const *set,
PtSignalProc_t func,
void *data);
参数列表：
app
应用程序上下文。
set
可能导致信号处理函数被调用的信号集合的指针。使用 sigemptyset() 和 sigaddset() 函数建立该集合。更多信息参见 QNX Neutrino Library Reference 。
func
信号处理函数。参见 Photon Library Reference 中的 PtSignalProc_t 。
data
函数所传递数据。
PtAppAddSignalProc() 返回 0 表示成功， -1 表示失败。
信号处理函数原型如下：
int signalProcFunctions (int signum
void *data);
参数列表如下：
signum
处理的信号数量。
data
PtAppAddSignalProc() 函数中指定的 data 参数。
如果你希望保留该信号，返回 Pt_CONTINUE ，删除信号返回 Pt_END( 如果函数还被其他信号注册，在其他信号产生时将再次被调用 ) 。
1.2 Removing a signal-processing function
删除信号处理函数：
调用 PtAppRemoveSignal() 删除单个或所有信号处理函数、数据对。
在信号处理函数中返回 Pt_END ，如果函数被多次注册，将会保持安装状态。
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