exit

从图中可以看出，_exit 函数的作用是：直接使进程停止运行，清除其使用的内存空间，并清除其在内核的各种数据结构；exit 函数则在这些基础上做了一些小动作，在执行退出之前还加了若干道工序。exit() 函数与 _exit() 函数的最大区别在于exit()函数在调用exit 系统调用前要检查文件的打开情况，把文件缓冲区中的内容写回文件。也就是图中的“清理I/O缓冲”。 所需头文件： exit: #include<stdlib.h> _exit: #include<unistd.h> 函数原型：exit: void exit(int status) _exit: void _exit(int status) 函数传入值：status 是一个整型的参数，可以利用这个参数传递进程结束时的状态。一般来说，0表示正常结束；其他的数值表示出现了错误，进程非正常结束。在实际编程时，父进程可以利用wait 系统调用接收子进程的返回值，从而针对不同的情况进行不同的处理。 exit()与_exit() 实例分析 printf(const char *fmt,...)函数使用的是缓冲I/O方式，该函数在遇到 "\n" 换行符时自动从缓冲区中将记录读出。 <代码示例> #include<stdio.h> #include<stdlib.h> #include<sys/types.h> #include

版权声明：本文为博主原创文章，未经博主允许不得转载。 从图中可以看出，_exit 函数的作用是：直接使进程停止运行，清除其使用的内存空间，并清除其在内核的各种数据结构；exit 函数则在这些基础上做了一些小动作，在执行退出之前还加了若干道工序。exit() 函数与 _exit() 函数的最大区别在于exit()函数在调用exit 系统调用前要检查文件的打开情况，把文件缓冲区中的内容写回文件。也就是图中的“清理I/O缓冲”。 所需头文件： exit: #include<stdlib.h> _exit: #include<unistd.h> 函数原型：exit: void exit(int status) _exit: void _exit(int status) 函数传入值：status 是一个整型的参数，可以利用这个参数传递进程结束时的状态。一般来说，0表示正常结束；其他的数值表示出现了错误，进程非正常结束。在实际编程时，父进程可以利用wait 系统调用接收子进程的返回值，从而针对不同的情况进行不同的处理。 exit()与_exit() 实例分析 printf(const char *fmt,...)函数使用的是缓冲I/O方式，该函数在遇到 "\n" 换行符时自动从缓冲区中将记录读出。 <代码示例> #include<stdio.h> #include<stdlib.h>

When a user presses the back button on an intent, the application should quit. How can I ensure the application quits when the back button is pressed? Immediately after you start a new activity, using startActivity , make sure you call finish() so that the current activity is not stacked behind the new one. EDIT With regards to your comment: What you're suggesting is not particularly how the android app flow usually works, and how the users expect it to work. What you can do if you really want to, is to make sure that every startActivity leading up to that activity, is a startActivityForResult

I am trying to create a WPF application that takes command line arguments. If no arguments are given, the main window should pop up. In cases of some specific command line arguments, code should be run with no GUI and exit when finished. Any suggestions on how this should properly be done would be appreciated. First, find this attribute at the top of your App.xaml file and remove it: StartupUri="Window1.xaml" That means that the application won't automatically instantiate your main window and show it. Next, override the OnStartup method in your App class to perform the logic: protected

Is there something similar to pipefail for multiple commands, like a 'try' statement but within bash. I would like to do something like this: echo "trying stuff" try { command1 command2 command3 } And at any point, if any command fails, drop out and echo out the error of that command. I don't want to have to do something like: command1 if [ $? -ne 0 ]; then echo "command1 borked it" fi command2 if [ $? -ne 0 ]; then echo "command2 borked it" fi And so on... or anything like: pipefail -o command1 "arg1" "arg2" | command2 "arg1" "arg2" | command3 Because the arguments of each command I believe

I would like to know how to I exit from Python without having an traceback dump on the output. I still want want to be able to return an error code but I do not want to display the traceback log. I want to be able to exit using exit(number) without trace but in case of an Exception (not an exit) I want the trace. jkp You are presumably encountering an exception and the program is exiting because of this (with a traceback). The first thing to do therefore is to catch that exception, before exiting cleanly (maybe with a message, example given). Try something like this in your main routine: