unix system programming book

number, and other related dates separately. Complete the end. See if you have a successful activation. Just follow the line as you would.The click "Yes" appears and a dialog box "License Wizard" will appear allowing you to enter the license number. Do not fill in at this time, direct next.Next, a dialog box appears, such as: Click "Enter License Manually" directly.Then the dialog box appears, filled in according to the "Name" and "Computer" Keygen.exe generated by the Shengh you run earlier. Mi

read mode, you need to call Pthread_rwlock_rdlock. To lock a read-write lock in write mode, you need to call Pthread_rwlock_wrlock. No matter how you lock a read-write lock, you can call Pthread_rwlock_unlock to unlock it. Similar to mutex, read-write locks can call Trylock to avoid thread clogging and to use Timedlock to set the waiting time.Barrier: A barrier is a synchronization mechanism in which users coordinate multiple processes to work in parallel. The barrier allows each thread to wait

Time-----Last visitedModify time-----Last modified content (LS-L)Change time-----Last modification of the attribute information (inode)8. Read the CatalogueOpendir (3);Readdir (3);Closedir (3);Glob (3);9. Understandmkdir (2);RmDir (2);Remove (3);//unlink (2)/rmdir (2);Rename (2);Chown (2);Fchown (2);Lchown (2);Umask (2);chmod (2);Fchmod (2);Link (2);Unlink (2);System data files and information1./etc/passwdMans 5 passwdGetpwuid (3);Getpwnam (3);2./etc

"Vfork function" before a child process calls exec or exit, he runs in the space of the parent process, and after calling exec, creates a new process . Vfork guarantees that the subroutine runs first before the parent process can be scheduled to run after calling exec or exit.4. The contents of the row buffer are flushed one line, with a newline character as the baseline. But the full buffer is flushed only when the cache is full. Before flushing, the contents are5. File sharing. A child process

In view of the need to use the GPU CUDA this technology, I want to find an introductory textbook, choose Jason Sanders and other books, CUDA by Example a Introduction to the general Purpose GPU Programmin G ". This book is very good as an introductory material. I think from the perspective of understanding and memory, many of the contents of the book can be omitted, so there is this blog post. This post rec

2016.8.12 23:20-23:501.2 Suggested BACKGROUND1.2 Reader's knowledge backgroundWe assume in this book so you have a certain amount of Linux or UNIX experience. In particular, you should has a general concept of what the system looks and feels from the user's perspective since we do N ' t review this material. Several good books can get to speed; See the Reading li

The basics and management of Linux applications introduces Linux fundamentals and management, including Linux installation, Linux GUI, Linux applications, Linux character interface, Linux text Editor, directory and file management, Linux common commands, kickstart configuration, shell programming, user and group account management, permissions, owners and ACLs, archive and compression, package installation and management, disk partitioning and formatt

int sigsuspend (const sigset_t * sigmask);The signal mask Word setting for the process is specified by Sigmask.The process is suspended until a signal is captured. Assuming a signal is captured, Sigsuspend returns, and the new high-screen word of the process is set to its previous value.Cases:#include "apue.h" static void Sig_int (int), void pr_mask (const char *STR)//print the current blocked signal {sigset_t sigset; int errno_save; Errno_save = errno; /* We can be called by signal hand

C Standard IO---io with cacheAdvantage:With cache (merge system calls)Disadvantages:Low real-time availabilityType of cache:Row cache: stdin stdout (buffer is size)Full cache: FileNo cache: stderr1. FlowThe identity of the open file2.FILE typestruct type:File descriptorThe address of the bufferSize of the cacheError ID3. Opening of the streamfopen (3);errno Global VariablesDefined macros:/usr/include/asm-generic/errno-base.h/usr/include/asm-generic/er

. File status flags (such as read, write, non-blocking, etc.)2. Current file offset3. Pointers to V-node table entries(3) V-node table entryEach open file has a V-node structure.Functions Pread and Pwritebelongs to atomic operations.Do not update the current file offsetfunction DUP and dup2To copy an existing file descriptorint dup (int fd)int dup2 (int fd, int fd2)A new file descriptor returned by the function shares the same file table entry as the parameter FDInvoke DUP (FD) equivalent to Fcn

program as an example, we know that this program if connected to the terminal, it will be output, because the terminal is a row buffer, here also provides a carriage return line.But if you run this program like this:a.out > OUT.txt. Where a.out is the executable file compiled for the above program, we redirect the output of A.out to OUT.txt. After running we will find that Hello World does not appear in the OUT.txt file. This is because if we are directing it from one file to another when we ru

the difference between Epool and select:Select the maximum FD opened in a process is limited, set by Fd_setsize, and the default value is 2048. However, Epoll does not have this restriction, it supports the FD limit is the maximum number of open files, this number is generally far greater than 2048, generally speaking, the larger the memory, the higher the FD cap, 1G memory can reach about 10w. Select polling mechanism is the system will go to find ea

is H_ERRNOP, not a global variable H_errnoIt is difficult to confirm the size of this buf. Not good to use.2> we can let the non-reentrant function itself be a new object, and finally return. Instead of returning a global static object. This is what the Getaddrinfo function does.The problem introduced: the space allocated within the function must require the caller to display the release, i.e. call function Freeaddrinfo. Otherwise, it causes a memory leak.Xi. Other Network informationWe mention

: # Include "apue. H "# include 3. Function sigsuspend # Include Int sigsuspend (const sigset_t * sigmask ); The signal shielding character setting of a process is specified by sigmask. The process is suspended before a signal is captured. If a signal is captured, sigsuspend returns, and the new value of the process is set to the previous value. Example: # Include "apue. H "static void sig_int (INT); void pr_mask (const char * Str) // print the current blocked signal {sigset_t sigset; int e

Transferred from csdn Forum Beginner "UNIX environment advanced programming" friends will encounter a problem, run inside the instance (download: http://www.apuebook.com/) problems, prompt "error: apue. h: No file or directory ". Apue. h is a header file customized by the author, including common header files and error handling functions required by the program. So it should be put into the

Let's start with a simple practice procedure:1#include 2 3 intMain ()4 {5 intC, n =0 ;6 while((c = GetChar ())! ='Q' )7printf"Char%3d is%ccode%d\n", n++, C, c);8 return 0 ;9}This is the program after the compilation of the effect of running, you can see after entering hello after hitting enter to run the program, that is, the characters entered in the terminal is actually buffered.In addition, the ENTER key itself is recognized as a newline, and is also recognized by the program, wh

This article describes how to use a PHP script to modify a Linux or Unix system password. Required Tools and Installation: You must install the following tools and software: – The shell script that modifies the password; –sudo access rights; –apache or LIGHTTPD Web server; –php Service-side program. Step 1: Install the shell foot that can modify the user's password the script could actually be used to

In Ruby's world, programmers enjoy all kinds of bizarre grammatical sugars, and also go through a variety of traps. And it's all about Ruby's powerful metaprogramming capabilities. Metaprogramming is like the magic of the Ruby World, and when it is white magic can help you to make the program very concise, beautiful, and when it is dark magic, you will be lost in some difficult to explain the bug. Ruby Metaprogramming is a cheat book that tells you h

This is a creation in Article, where the information may have evolved or changed. In November 2009, Google has been keeping an eye on it for the first time since it publicly disclosed the existence of Go. But the real start of the go language was in the first half of 2011, when a distributed object storage system was developed using the go language with the early members of our team. at the same time, there are few individuals or organizations on the

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