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原创（Android系统）android property浅析

android property，相信各位android平台的开发人员用到的不会少，但是property的具体机制大家可能知道的不多，这里利用空闲时间大致了解了一些，特此分享跟大家，如有谬误，欢迎指正android 1号进程进程init进程在开机的时候就会调用property_init函数，至于init是怎么起来的，这里不是重点，所以暂时先不介绍，property_init的具体flo

2014-06-30 19:34:05 4528

原创（Android系统）android log机制浅析

在android下面debug，最主要的方式就是用logcat抓log了，我们可能有尝试过使用printf来打印，当然结果是不行的，这里有时间就看了一下android平台下log的flow，在此做个笔记以作记录我们一般使用ALOGD来打印log，所以这里就跟一下ALOGD的flowsystem/core/include/log/log.hsystem/core/include/

2014-06-26 16:57:04 6095

原创（程序员面试题）二叉树的基本操作

本文只说二叉树的最基本操作，建树和遍历，其他的只是后续再讲testcase如下：#include #include typedef struct biTreeNode { int data; struct biTreeNode *lchild, *rchild;} *btNode;void preorder(btNode head) {

2014-04-01 16:21:02 684

原创（程序员面试题）单链表的反转

只用一个额外的节点实现单链表的反转testcase如下：#include #include typedef struct num { int data; struct num *next;} *num_ptr;void print_num(num_ptr head) { num_ptr tmp = head; wh

2014-03-30 19:53:36 680

原创（程序员面试题）链队列的基本操作

队列的基本操作跟栈类似，有如下几种：入队列，出队列，判断队列满，判断队列空，遍历队列。但是跟栈不一样的是：栈的入栈和出栈操作始终是在栈顶，但是队列的入队列是在队列尾部，出队列是在队列的头部。详情请见testcase：#include #include #include #define QUEUE_MAX 3typedef struct queue { char d

2014-03-30 16:49:34 758

原创（程序员面试题）链栈的基本操作

链栈的基本操作有如下几种：入栈，出栈，判断栈满，判断栈空，遍历栈详情请见testcase：#include #include #include #define STACK_MAX 3typedef struct stack { char data[10]; struct stack *next;} *st_ptr;int is_stack_empty(st_p

2014-03-30 15:36:04 854

原创（程序员面试题）链表的基本操作

链表的基本操作有四种：建立，插入，删除，遍历在程序里面如下：#include #include #include typedef struct student { char name[10]; struct student *next;}* st_ptr;void print_st(st_ptr head) { st_ptr tmp = head; while (tm

2014-03-30 14:47:45 520

转载（work and tools）tcpdump的用法

此文转载于http://www.cnblogs.com/ggjucheng/archive/2012/01/14/2322659.html简介用简单的话来定义tcpdump，就是：dump the traffic on a network，根据使用者的定义对网络上的数据包进行截获的包分析工具。 tcpdump可以将网络中传送的数据包的“头”完全截获下来提供分析。它支持针对网络层、协议、

2014-03-11 21:23:35 741

转载（work and tools）ubuntu中文输入法

Ubuntu 12.04中文输入法的安装 Ubuntu上的输入法主要有小小输入平台（支持拼音/二笔/五笔等），Fcitx，Ibus，Scim等。其中Scim和Ibus是输入法框架。在Ubuntu的中文系统中自带了中文输入法，通过Ctrl+Space可切换中英文输入法。这里我们主要说下Ubuntu英文系统中，中文输入法的安装。第一步，是安装语言包。我们选择System Setti

2014-03-06 17:09:49 684

转载（work and tools）ubuntu安装tftp

ubuntu安装tftp server 1、安装相关软件包apt-get install tftpd （服务端）apt-get install tftp （客户端）apt-get install xinetd2、建立配置文件cd /etc/xinetd.d/vi tftp (/etc/xinetd.d/tftp

2014-03-06 13:56:56 741

翻译（wifi-display specification）RTSP交互信息详解

RTSP交互信息详解M1A WFD Source shall send an RTSP M1 request to a WFD Sink to begin the RTSP procedures and a WFD Capability Negotiation. The RTSP M1 request shall contain an RTSP OPTIONS request. A W

2014-03-01 16:05:08 4846

翻译（standard c libraries translation ）fileno

clearerr, feof, ferror, fileno - check and reset stream statusclearerr, feof, ferror, fileno - 检查和重置流状态所需头文件#include void clearerr(FILE *stream);int feof(FILE *stream);int ferror(FILE *s

2014-02-20 20:26:56 667

翻译（standard c libraries translation ）fcntl

fcntl - manipulate file descriptorfcntl - 操作文件描述符所需头文件#include #include int fcntl(int fd, int cmd, ... /* arg */ );fcntl() performs one of the operations described below on the ope

2014-02-20 11:34:03 1585

翻译（standard c libraries translation ）mkstemp

mkstemp, mkostemp, mkstemps, mkostemps - create a unique temporary filemkstemp, mkostemp, mkstemps, mkostemps - 创建一个唯一的临时文件所需头文件#include int mkstemp(char *template);int mkostemp(char *temp

2014-02-17 17:41:39 1247

翻译（tandard c libraries translation ）flock

flock - apply or remove an advisory lock on an open fileflock - 添加或者移除咨询性文件锁所需头文件#include int flock(int fd, int operation);Apply or remove an advisory lock on the open file specified b

2014-02-17 16:14:20 691

翻译（standard c libraries translation ）sync

sync, syncfs - commit buffer cache to disksync, syncfs - 提交buffer缓冲到磁盘所需头文件#include void sync(void);void syncfs(int fd);Feature Test Macro Requirements for glibc (see feature_test_

2014-02-15 15:25:22 996

翻译（standard c libraries translation ）lseek

lseek - reposition read/write file offsetlseek - 重定位读/写文件偏移量所需头文件#include #include off_t lseek(int fd, off_t offset, int whence);The lseek() function repositions the offset of the

2014-02-15 13:53:37 1041

翻译（standard c libraries translation ）write

write - write to a file descriptorwrite - 写到一个文件描述符所需头文件#include ssize_t write(int fd, const void *buf, size_t count);write() writes up to count bytes from the buffer pointed buf to

2014-02-14 17:10:43 602

翻译（standard c libraries translation ）read

read - read from a file descriptorread - 从一个文件描述符中读所需头文件#include ssize_t read(int fd, void *buf, size_t count);read() attempts to read up to count bytes from file descriptor fd into

2014-02-14 15:03:10 671

翻译（ standard c libraries translation ）dup

dup, dup2, dup3 - duplicate a file descriptordup, dup2, dup3 - 复制一个文件描述符所需头文件#include int dup(int oldfd);int dup2(int oldfd, int newfd);#define _GNU_SOURCE /* See feature

2014-02-14 11:55:34 677

翻译（ standard c libraries translation ）close

close - close a file descriptorclose - 关闭一个文件描述符所需头文件#include int close(int fd);close() closes a file descriptor, so that it no longer refers to any file and may be reused. Any re

2014-02-13 19:41:38 558

翻译（standard c libraries translation ）open

open, creat - open and possibly create a file or deviceopen, creat - 打开和可能创建一个文件或者设备所需头文件#include #include #include int open(const char *pathname, int flags);int open(const char *pat

2014-02-13 17:57:41 888

原创（about program）#if的使用

一般在写code时候会遇到需要使用宏来隔开的情况，最常见的就是使用：#ifdef XX ...#else ...#endif组合了，这个能隔开XX和非XX情况。但是如果是XX，YY和其他三种情况呢？就需要用下面方法来隔开：#if defined(XX) ...#elif defined(YY) ...#else

2014-02-11 15:44:30 575

翻译（standard c libraries translation ）getpass

getpass - get a passwordgetpass - 获取一个密码所需头文件：#include char *getpass( const char *prompt);This function is obsolete. Do not use it.这个函数已经被废弃，请勿使用The getpass() function opens

2014-01-09 11:55:06 767

翻译（standard c libraries translation ）setuid

setgid - set group identitysetgid - 设置组id所需头文件#include #include int setgid(gid_t gid);setgid() sets the effective group ID of the calling process. If the caller is the superuser, th

2014-01-07 20:28:41 665

翻译（standard c libraries translation ）setfsuid

setfsuid - set user identity used for file system checkssetfsuid - 为文件系统设置用户id所需头文件#include /* glibc uses */int setfsuid(uid_t fsuid);The system call setfsuid() sets the user ID that

2014-01-07 20:01:50 749

翻译（standard c libraries translation ）seteuid

seteuid, setegid - set effective user or group IDseteuid, setegid - 设置有效的用户和组id所需头文件#include #include int seteuid(uid_t euid);int setegid(gid_t egid);seteuid() sets the effective

2014-01-07 17:32:41 684

翻译（standard c libraries translation ）logwtmp

updwtmp, logwtmp - append an entry to the wtmp fileupdwtmp, logwtmp - 增加入口到wtmp文件尾部所需头文件#include void updwtmp(const char *wtmp_file, const struct utmp *ut);void logwtmp(const char *line,

2014-01-07 16:40:20 977

翻译（ standard c libraries translation ）fgetgrent

fgetpwent - get password file entryfgetpwent - 获取密码文件的入口所需头文件#include #include #include struct passwd *fgetpwent(FILE *stream);The fgetpwent() function returns a pointer to a str

2014-01-07 11:00:56 952

翻译（ standard c libraries translation ）getpwnam

getpwnam, getpwnam_r, getpwuid, getpwuid_r - get password file entrygetpwnam, getpwnam_r, getpwuid, getpwuid_r - 获取password文件的入口所需头文件#include #include struct passwd *getpwnam(const char

2014-01-06 21:07:33 1213

翻译（standard c libraries translation ）getpw

getpw - reconstruct password line entrygetpw - 重建password行入口所需头文件#define _GNU_SOURCE /* See feature_test_macros(7) */#include #include int getpw(uid_t uid, char *buf);T

2014-01-06 20:14:15 751

翻译（standard c libraries translation ）getgroups

getgroups, setgroups - get/set list of supplementary group IDsgetgroups, setgroups - 获取/设置附加组id的列表所需头文件#include #include int getgroups(int size, gid_t list[]);#include int setgroups(

2014-01-06 20:01:11 845

翻译（standard c libraries translation ）getgrgid

getgrnam, getgrnam_r, getgrgid, getgrgid_r - get group file entrygetgrnam, getgrnam_r, getgrgid, getgrgid_r - 获取group文件的入口所需头文件#include #include struct group *getgrnam(const char *name);

2014-01-06 17:50:34 1005

翻译（ standard c libraries translation ）getuid

getuid, geteuid - get user identitygetuid, geteuid - 获取用户id所需头文件#include #include uid_t getuid(void);uid_t geteuid(void);getuid() returns the real user ID of the calling process.

2014-01-06 16:42:50 757

翻译（standard c libraries translation ）getutent

getutent, getutid, getutline, pututline, setutent, endutent, utmpname - access utmp file entriesgetutent, getutid, getutline, pututline, setutent, endutent, utmpname - 获取utmp文件的入口所需头文件#include

2014-01-04 16:34:17 815

翻译（standard c libraries translation ）getpwent

getpwent, setpwent, endpwent - get password file entrygetpwent, setpwent, endpwent - 获取密码文件入口所需头文件#include #include struct passwd *getpwent(void);void setpwent(void);void endpwent(vo

2014-01-04 15:38:31 737

翻译（ standard c libraries translation ）getgrent

getgrent, setgrent, endgrent - get group file entrygetgrent, setgrent, endgrent - 获取group文件的入口所需头文件#include #include struct group *getgrent(void);void setgrent(void);void endgrent(vo

2014-01-03 18:02:29 779

翻译（standard c libraries translation ）getlogin

getlogin, getlogin_r, cuserid - get usernamegetlogin, getlogin_r, cuserid-获取用户名所需头文件#include char *getlogin(void);int getlogin_r(char *buf, size_t bufsize);#include char *cuserid(cha

2014-01-03 16:11:39 1723

翻译（standard c libraries translation ）strtok

strtok, strtok_r - extract tokens from stringsstrtok,strtok_r-从字符串中提取标记所需头文件：#include char *strtok(char *str, const char *delim);char *strtok_r(char *str, const char *delim, char **savep

2014-01-03 14:49:51 774

翻译（standard c libraries translation ）strstr

strstr, strcasestr - locate a substring定位子串所需头文件#include char *strstr(const char *haystack, const char *needle);#define _GNU_SOURCE /* See feature_test_macros(7) */#include

2014-01-02 20:58:08 708