errno

ValueError:PyCapsule_GetPointer called with incorrect name with <from PyQt5.QtWebEngineWidgets import QWebEnginePage>

由 会有一股神秘感。 提交于 2019-12-10 17:49:37
问题 This is already solved by myself but I put this question for someone else. I think this kind of problem is better as much as we can. and there doesn't seem be in SOF. I updated spyder and PyQt5 . conda update spyder Collecting package metadata: done Solving environment: done ## Package Plan ## environment location: C:\Anaconda3 added / updated specs: - spyder The following packages will be downloaded: package | build ---------------------------|----------------- anaconda-custom | py36h363777c

How to get the errno from an IOError in haskell?

由 僤鯓⒐⒋嵵緔 提交于 2019-12-10 16:55:36
问题 I'm on the haskell platform, GHC 6.12.1 as apt-get installed on Debian Squeeze. How can I get the underlying errno out of an IOError, given that I need it on a different thread to where it was originally raised? The reason I need this is because I'm implementing a network protocol which exposes the actual errno value on the wire. Do I need to reconstruct it? 回答1: errno is thread-local in GHC. You'll need to trap the errno in one thread; then send the value down a Chan or other communication

linux c 获取终端光标的坐标

由 时间秒杀一切 提交于 2019-12-10 13:28:56
参考资料 http://www.linuxquestions.org/questions/programming-9/get-cursor-position-in-c-947833/ #include <unistd.h> #include <fcntl.h> #include <termios.h> #include <errno.h> #define RD_EOF -1 #define RD_EIO -2 static inline int rd(const int fd) { unsigned char buffer[4]; ssize_t n; while (1) { n = read(fd, buffer, 1); if (n > (ssize_t)0) return buffer[0]; else if (n == (ssize_t)0) return RD_EOF; else if (n != (ssize_t)-1) return RD_EIO; else if (errno != EINTR && errno != EAGAIN && errno != EWOULDBLOCK) return RD_EIO; } return 0; } static inline int wr(const int fd, const char *const data, const

How to set errno in Linux device driver?

由 别等时光非礼了梦想. 提交于 2019-12-10 02:02:16
问题 I am designing a Linux character device driver. I want to set errno when error occurs in ioctl() system call. long my_own_ioctl(struct file *file, unsigned int req, unsigned long arg) { long ret = 0; BOOL isErr = FALSE; // some operation // ... if (isErr) { // set errno // ... <--- What should I do? ret = -1; } return ret; } What should I do to achieve that? Thank you at advance! Please allow me to explain my application with more detail. My device is located in /dev/myCharDev. My user space

tmpfile() on windows 7 x64

由 只谈情不闲聊 提交于 2019-12-09 22:59:02
问题 Running the following code on Windows 7 x64 #include <stdio.h> #include <errno.h> int main() { int i; FILE *tmp; for (i = 0; i < 10000; i++) { errno = 0; if(!(tmp = tmpfile())) printf("Fail %d, err %d\n", i, errno); fclose(tmp); } return 0; } Gives errno 13 (Permission denied), on the 637th and 1004th call, it works fine on XP (haven't tried 7 x86). Am I missing something or is this a bug? 回答1: A bit of a refresher from the manpage of on tmpfile() , which returns a FILE* : The file will be

Linux socket

由 做~自己de王妃 提交于 2019-12-09 11:35:45
Linux下socket有select、poll、epoll和AIO等方式，其中，前三种为同步方式。 有很多种方法可以设置socket为非阻塞模式，常用的是使用fcntl(sockfd, F_SETFL, O_NONBLOCK); 在阻塞模式下，可以通过setsockopt来设置(读/写)超时，connect也可以用setsockopt来设置，与写参数一致: setsockopt(fd, SOL_SOCKET, SO_SNDTIMEO,&timeo, len); connect的超时一般是nonblocking+select。 同步、异步与阻塞、非阻塞的区别 参考 Linux IO模式及 select、poll、epoll详解 使用异步 I/O 大大提高应用程序的性能 TCP服务端 创建socket -> bind -> listen -> accept -> send/recv -> close 代码摘自http://blog.csdn.net/shallnet/article/details/17734919，后同 　　#include <stdio.h> 　　#include <unistd.h> 　　#include <errno.h> 　　#include <string.h> 　　#include <sys/types.h> 　　#include <sys/socket

2019-2020-1 20175304 20175303 20175327 20175335 实验五 通讯协议设计

由 混江龙づ霸主 提交于 2019-12-08 23:34:33
2019-2020-1 20175304 20175303 20175327 20175335 实验五 通讯协议设计 一、实验内容 通讯协议设计-1 1.在Ubuntu中完成 http://www.cnblogs.com/rocedu/p/5087623.html 中的作业 2.提交运行结果截图 通讯协议设计-2 1.在Ubuntu中实现对实验二中的“wc服务器”通过混合密码系统进行防护 2.提交测试截图 通讯协议设计-3 1 运行实验箱中，ARM调用Z32算法的实验，提交实验截图 2 用Z32的国密算法重新改写“wc服务器”的混合密码系统防护，提交运行截图 二、实验过程 通讯协议设计-1 1.OpenSSL简介 OpenSSL是一个SSL协议的开源实现，采用C语言作为开发语言，具备了跨平台的能力，支持Unix/Linux、Windows、Mac OS等多种平台。 2.OpenSSL整个软件包大概可以分成三个主要的功能部分： 密码算法库 SSL协议库 应用程序 OpenSSL源码的目录结构也是围绕这三个功能部分进行规划的。 密码算法库是一个强大完整的密码算法库，它是OpenSSL的基础部分，也是很值得一般密码安全技术人员研究的部分，它实现了目前大部分主流的密码算法和标准。主要包括对称算法、非对称算法、散列算法、数字签名和认证、X509数字证书标准、PKCS12、PKCS7等标准

2019-2020-1 20165213 20165224 20165311 《信息安全系统设计基础》实验五 通讯协议设计

由 孤者浪人 提交于 2019-12-08 18:12:42
学习到的内容 Linux下的应用大多可以直接使用，也可以获取源代码自己进行编译、安装，使用源代码安装的过程一般是： configure make make install gcc -o test_openssl test_openssl.c -I /usr/local/ssl/include -L /usr/local/ssl/lib -lcrypto -ldl -lpthread 上面这句表示在编译test_openssl.c时： -o test_openssl test_openssl.c： 将test_openssl.c编译生成可执行文件test_openssl(如果不给出这个选项，gcc就给出预设的可执行文件a.out) -I /usr/local/ssl/include： 将/usr/local/ssl/include目录作为第一个寻找头文件的目录，寻找的顺序是：/usr/local/ssl/include-->/usr/include-->/usr/local/include -L /usr/local/ssl/lib： 将/usr/local/ssl/lib目录作为第一个寻找库文件的目录，寻找的顺序是：/usr/local/ssl/lib-->/lib-->/usr/lib-->/usr/local/lib -L：指定链接库的文件夹地址 -ldl：加载动态库

Meaning of error numbers in Python exceptions

由 故事扮演 提交于 2019-12-08 17:09:44
问题 Catching Python's OverflowError after some dumb calculation, I checked the error's args and saw it's a tuple containing an integer as its first coordinate. I assume this is some kind of error number ( errno ). However, I could not find any documentation or reference for it. Example: try: 1e4**100 except OverflowError as ofe: print ofe.args ## prints '(34, 'Numerical result out of range')' Do you know what 34 means in this context? Do you know other possible error numbers for this exception?

Mysql: ERROR 1005 (HY000): Can't create table 'receitascakephp.recipes' (errno: 150)

由 你说的曾经没有我的故事 提交于 2019-12-08 01:32:13
问题 CREATE TABLE `users` ( `id` INT NOT NULL PRIMARY KEY AUTO_INCREMENT, `name` VARCHAR(255) NOT NULL, `username` VARCHAR(75) NOT NULL, `password` VARCHAR(75) NOT NULL, `image` VARCHAR(255) ); CREATE TABLE `recipes` ( `id` INT NOT NULL PRIMARY KEY AUTO_INCREMENT, `name` VARCHAR(255) NOT NULL, `method` TEXT NOT NULL, `image` VARCHAR(255), `user_id` INT NOT NULL, CONSTRAINT `fk_recipes_users` FOREIGN KEY(`user_id`) REFERENCES `users`(`id`) ON DELETE CASCADE ) ENGINE=InnoDB DEFAULT CHARSET=utf8; I
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