fwrite

Does fwrite call any lock internally?

由 耗尽温柔 提交于 2019-12-01 11:54:09
In solaris when I attached dbx to one of the running stacks, I found the call to fwrite leading to __lll_lock_wait()? In what scenario will this happen? Does fwrite internally tries to acquire a lock? the standards that I looked through (C99 and POSIX) do say nothing about locked or unlocked IO concerning fwrite . On my linux system their is a not very precise mentioning of locking in the man page: For non-locking counterparts, see unlocked_stdio(3). and effectively, there is a fwrite_unlocked function. Standard unlocked functions in POSIX are only getc_unlocked() , getchar_unlocked() , putc

Does fwrite call any lock internally?

由 只愿长相守 提交于 2019-12-01 09:51:56
问题 In solaris when I attached dbx to one of the running stacks, I found the call to fwrite leading to __lll_lock_wait()? In what scenario will this happen? Does fwrite internally tries to acquire a lock? 回答1: the standards that I looked through (C99 and POSIX) do say nothing about locked or unlocked IO concerning fwrite . On my linux system their is a not very precise mentioning of locking in the man page: For non-locking counterparts, see unlocked_stdio(3). and effectively, there is a fwrite

Atomic file replacement in Python

由 有些话、适合烂在心里 提交于 2019-12-01 04:56:32
What's the recommended way to replace a file atomically in Python? i.e. if the Python script is interrupted, there is a power outage etc. files do not have a high probability of ending up in an inconsistent state (half written to the disk). A solution for Linux/UNIX platforms is preferred. (I know getting 100% atomic operations might depend on your file system, but at least make the chances for the corruption low) Create a new file and os.rename() it over the existing file. This is atomic on most platforms under most conditions . 来源： https://stackoverflow.com/questions/7645338/atomic-file

Is fopen() limited by the filesystem?

由 雨燕双飞 提交于 2019-12-01 04:48:09
问题 I wrote a program to generate large .SQL files for quickly populating very large databases. I scripted it in PHP. When I started coding I was using fopen() and fwrite() . When files got too large the program would return control to the shell and the file would be incomplete. Unfortunately I'm not sure exactly how large is 'too large'. I think it may have been around 4GB. To solve this problem I had the file echo to stdout. I redirected it when I called the program like so: [root@localhost]$

PHP fwrite() for writing a large string to file

由 拟墨画扇 提交于 2019-12-01 04:13:10
问题 I have to write a large string 10MB to file, and I am using this line to achieve that: fwrite($file, $content); the problem is: not the whole string is written to the file, and limited to a specific limit. and fwrite always return 7933594 . 回答1: Yes, fwrite function is limited to length, and for a large files you may split the file to a smaller pieces like the following: $file = fopen("file.json", "w"); $pieces = str_split($content, 1024 * 4); foreach ($pieces as $piece) { fwrite($file,

Atomic file replacement in Python

由 北慕城南 提交于 2019-12-01 01:43:21
问题 What's the recommended way to replace a file atomically in Python? i.e. if the Python script is interrupted, there is a power outage etc. files do not have a high probability of ending up in an inconsistent state (half written to the disk). A solution for Linux/UNIX platforms is preferred. (I know getting 100% atomic operations might depend on your file system, but at least make the chances for the corruption low) 回答1: Create a new file and os.rename() it over the existing file. This is

set utf-8 encoding for fread fwrite

由 可紊 提交于 2019-11-30 23:45:39
hi i use this code read and write text in file . $d = fopen("chat.txt", "r"); $content=fread($d,filesize('chat.txt')); $bn=explode('||',$content); foreach($bn as $bn) echo $bn.'<br>'; and $d = fopen("chat.txt", "a"); $c=$_GET['c']; if($c=='') die(); fwrite($d,$c.'||'); fclose($d); but in =ie only= utf-8 character show "?" or "[]" . my encoding Utf-8 Without BOM and i use this header('Content-type: text/html; charset=UTF-8'); and This : <meta http-equiv="content-type" content="text/html; charset=utf-8" /> my defult encoding in php.ini is utf-8 but yet show ? . i see chat.txt file and character

Make cURL write data as it receives it

由 ＊爱你＆永不变心＊ 提交于 2019-11-30 19:10:22
问题 I have the following php code which I found here: function download_xml() { $url = 'http://tv.sygko.net/tv.xml'; $ch = curl_init($url); $timeout = 5; curl_setopt($ch, CURLOPT_URL, $url); curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1); curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, $timeout); $data = curl_exec($ch); echo("curl_exec was succesful"); //This never gets called curl_close($ch); return $data; } $my_file = 'tvdata.xml'; $handle = fopen($my_file, 'w'); $data = download_xml(); fwrite($handle,

Using python ctypes and libc to write void pointer to binary file

由 可紊 提交于 2019-11-30 18:01:01
问题 I am using python ctypes and libc to interface with a vendor-provided DLL file. The purpose of the DLL file is to acquire an image from a camera. The image acquisition appears to run without error; the issue I am having is accessing the data. The image acquisition function takes a ctypes.c_void_p as an argument for the image data. simplified as follows: """ typedef struct AvailableData { void* initial_readout; int64 readout_count; } imageData; """ class AvailableData(ctypes.Structure):

PHP如何免费对接调用快递物流单号查询api接口

由 时光总嘲笑我的痴心妄想 提交于 2019-11-30 12:29:25
博主最近需要做一个物流信息轨迹查询的api接口，就去网上搜索，看到了一个快递鸟的API接口，返回值是以JSON格式，只需要返回是转成数组就能轻松实现各种实例了。真的很方便。 对接流程 快递鸟网站申请接口KEY并认证-对接接口-调试-上线使用 二、对接准备 1. 登录快递鸟注册快账号 2.获取开发者账号信息（ID ,API Key）， 登录快递鸟后台中查看 3.进行技术联调，并完成调试，物流查询api地址： http://www.kdniao.com/api-track 实名认证后需开通服务 下图是快递鸟API示意接口， 由于是免费的，所以限制很多，比如每天最多只能查询3000次和需要实名认证。 博主这里贴出博主的代码： `<?php //电商ID defined('EBusinessID') or define('EBusinessID', '电商ID'); //电商加密私钥，快递鸟提供，注意保管，不要泄漏 defined('AppKey') or define('AppKey', '电商加密私钥'); //请求url defined('ReqURL') or define('ReqURL', ' http://api.kdniao.cc/Ebusiness/EbusinessOrderHandle.aspx '); //调用查询物流轨迹 //-------------------
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