unix programming book

Original address: Lax Language TutorialsAndrew BinstockEvery year in the review of Jolt Awards books, I will be a number of language tutorial books are exhausted. Judging from these years of experience, these language tutorials are well written, but in addition, there are few bright spots. In other words, these books are very rigorous, very sophisticated, if the reader has sufficient strength, through their mastery of a language programming technology

returning a new file offset, an error returns 1 indicating that the file cannot set an offset(1) whence is Seek_set, set the file offset to the start of the file offset(2) whence is Seek_cup, set the file offset to the current value plus offset(3) whence is seek_end, the offset of the file is set to the file length plus offset, offset can be a positive negativeSome devices allow offsets to be negative , so be careful when comparing lseek return values, and do not test for less than 0, but equal

about permissions. permission management can only be applied to the operating system.Network transmission:SVN does not compress and transfers data after git compression.I have read chapter 6th and Chapter 3rd of UNIX network programming.Chapter 2: select and pollAll are Io reusable functions.Poll appears late and advanced.The endorsement of select is Apache.The endorsement of poll is nginx.Why is epoll so fast?BytesPreparations: The best epoll explan

Multi-thread programming in Unix/Linux 1. ThreadA thread is usually called a lightweight process. Although this method is somewhat simplified, it is helpful to understand the concept of thread.Because threads and processes are relatively small, threads consume less CPU resources. Processes often need their own resources,However, resources can be shared between thread

= +, effective uid= +lienhua34:demo$su# ChownRoot tsys#chmodu+s tsys#ls-L Tsys-rwsrwxr-x1Root Lienhua347358October the at:Panax Notoginsengtsys# exitexitlienhua34:demo$./tsys./printuidsreal UID= +, effective uid=0During the execution of the above, we set the owner of the Tsys file to Superuser root and set the user ID bit. Thus, when executing the Tsys file, the process has a valid user ID of 0 (that is, root). The child process that calls the system function to execute the Printuids file inher

Tags: abstract location Memory language version implements RAM execution machine A process is an instance of an executable program. A program is a file that contains a series of information that describes how to create a process at run time, including the following. Binary format identification: Each program file contains meta information (metainformation) that describes the format of the executable file. The kernel (kernel) uses this information to interpret other information in the file. His

dispose of it (gets the information about terminating the child process, releasing the resources it still occupies). The only way to eliminate a zombie process is to terminate its parent process.Orphan process: The process's parent process terminates before itself. It is characterized by the ppid=1 (the ID of the init process). An orphan process can be a self-made orphan process group.A process belongs to a process group, a process group belongs to a session, a session may or may not have a con

);//Lock the thread, and if the mutex has been locked, the program is blocked at that point until the other thread unlocks it to the resource. while(value//If Vallue is within the predetermined range if(value%2==0){//value is evenprintf"fun2 value =%d\n",value);value++; Pthread_cond_signal (dan);//Send as a dual signal. Notifies the odd processing thread pthread_fun1 ().}Else{pthread_cond_wait (shuang, mutex);//blocking the program and unlocking the mutex. Wait for the condition vari

queuing related knowledge #include See the UNIX Advanced Environment Programming 286 page, which explains why Sigsuspend is present, the most important of which is its atomic operation (first recover the signal screen word and then make the process hibernate (accurately suspend)) the signal screen word for the process is set to the Sigmask point value. Return conditional signal occurs, and the signal

, generally use I/O multiplexing; It is possible for a client to handle multiple sockets at the same time, but relatively rare; If a server is to process TCP, but also processing UDP, the general need to use I/O multiplexing. If a server is to handle multiple services or multiple protocols, I/O multiplexing is generally used. I/O multiplexing is not limited to network programming, and many important applications need to use this technology as well

UNIX programming is very easy to encounter this function, we can first look at the introduction of this function, with the man tool, man alarm. The introduction to the alarm function in online Help for UNIX systems is as follows: #include Its main function is to set the signal transmission alarm clock. Its main function is to set the signal SIGALRM to the cu

basic information of this bookShanyun (authored)Publisher: People's post and telecommunications publishing housePublication date: 2012-6-1isbn:9787115280640Edition: 1Number of pages: 265Number of words: 406000Printing time: 2012-6-1Folio: 16 OpenPaper: uncoatedImpressions: 1Package: PlainPrice: 39.00 RMBbook coverContent Introduction"C + + Hacker programming Disclosure and prevention" is designed through simple grammar knowledge and common system func

[07] UNIX process environment========================================1. Process TerminationAtexit () function registration termination processProgram.Exit () or return statement:Terminate the Handler-> terminate the Handler-> standard I/O cleanup-> _ exit ()-> enter the kernel._ Exit () directly enters the kernel. 2. Environment tableExtern char ** environ;Example:For (I = 0; Environ [I]! = NULL; I ++){Printf ("env [% d]: % s \ n", I, Environ [I]);}

The UNIX volume I bought last summer has only begun to look very ashamed, and I am ashamed that the first program has been on and off for a few days, so I have to write a program, and I am looking for a job soon, the following describes how to run the first program in this book: Search various blogs I use Ubuntu 13.04 as the system. Thanks to the blog: After the portal, you must record your various problems

Linux and Unix Secure Programming: environment variables-general Linux technology-Linux programming and kernel information. For details, see the following. Environment Variable By default, environment variables are inherited from the parent process of the process. However, when the program executes another program, the calling program can set the environment var

Chapter 1: The C/C ++ language provides two different programming modes: ipl32 and pl64.? Ipl32● The three data types integer, pointer, and long are 32-bit (4 bytes). In this mode, 32The theoretical memory usage limit is 4 GB.? Pl64● The pointer and long data types are 64-bit (8 bytes). The address space is 64-bit and the memory usage exceeds4 GB (up to 2 ^ 60 bytes = 1eb ). More infoabout ipl32 and pl64, please refer to http://www-31.ibm.com/cn/d

convenient way to access each element in the socket address (struct sockaddr) structure. Note that sin_zero [8] is used to ensure that the two structures have the same size in the memory. When using sockaddr_inSet sin_zero to zero (using the bzero () or memset () function ). Furthermore, it is very important that a pointer pointing to struct sockaddr_in can declare a structure pointing to a sturct sockaddr. So althoughThe socket () function requires a structaddr *. You can also give it a sockad

be executed, the shell will search the disk and find the specified program, and when found, the shell requests the kernel to initialize the program, and then the shell goes to "sleep" until the program finishes executing.Program Name parameter tableShell role:implementation procedures;Interpreting programming languages;Environmental control;Pipe line Connection;I/O redirection;Variable and file name substitution;The shell determines the starting and

' inet_ntop ':6INET_NTOP.C: the: at: Warning: ' Best.len ' may used uninitializedinchThisfunction[-wmaybe-Uninitialized]7 if(Best.base = =-1|| Cur.len >Best.len)8^9INET_NTOP.C:123: -: Note: ' Best.len ' was declared hereTenstruct {intbase, Len;} Best, cur; One^ A GCC-I.. /lib-g-o2-d_reentrant-wall-c-o inet_pton.o inet_pton.c - arRv.. /libunp.a in_cksum.o INET_NTOP.O inet_pton.o -AIN_CKSUM.O theAINET_NTOP.O -AINET_PTON.O -Ranlib. /libunp.aAt this point, the compilation succeeded in generatin

The recommended star rating for this book is: 5 stars. After all, it is a classic book, Nothing to say.As far as the Assembly itself is concerned, the preparation of high-efficiency programs and the optimization, commissioning, and reverse engineering of the project is a foundation; in terms of the theoretical operating system, the assembly lets you understand the CPU, understand the architecture of the com