unistd

/**************************************** * The file name :exit_differ.c * Description : Comparison functions exit(int status) And function _exit(int status) The difference between * #include <stdlib.h> * void exit(int status) * void _exit(int statu

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#include <sys/socket.h> #include <sys/types.h> #include <netinet/in.h> #include <arpa/inet.h> #include <unistd.h> #define PORT 17951 /************************** * Exercise socket bind listen accept * *********************/ in

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select () system call provides a mechanism to synchronize multiple I / O: # Include <sys/time.h> # Include <sys/types.h> # Include <unistd.h> int select (int n, fd_set * readfds, fd_set * writefds, fd_set * exceptfds, struct timeval * ti

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The pipe #include <unistd.h> int pipe(int filedes[2]); Returns: 0 if OK, 1 on error Parameters filedes returns two file descriptors: filedes [0] is opened for reading, filedes [1] opened for writing. Example: Father through pipes into the process of

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1.signal function #include <signal.h> void (*signal(int signo, void (*func)(int)))(int); Returns: previous disposition of signal (see following) if OK, SIG_ERR on error General prototype of the signal function can be written Sigfunc * signal (int, S

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By creating two threads to achieve a number of additive. Perhaps this instance there is no real use value, but slightly changed look, we can use other places to pull. # Include <pthread.h> # Include <stdio.h> # Include <sys/time.h> # Inc

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Simple tcp communication example. server side /* tcp_server.c */ #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <arpa/inet.h

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1 process identifier Each process has a unique non-negative integer process ID #include <unistd.h> pid_t getpid(void); Returns: process ID of calling process pid_t getppid(void); Returns: parent process ID of calling process uid_t getuid(void); Retu

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1 password file stored in the password file / etc / passwd, is an ASCII file with a user name or UID passwd structure information to obtain a function # Include <pwd.h> struct passwd * getpwuid (uid_t uid); struct passwd * getpwnam (const char * nam

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1.open function # Include <fcntl.h> int open (const char * pathname, int oflag, .../* mode_t mode * /); oflag parameters: O_RDONLY open read-only O_WRONLY Write only open O_RDWR Open to read and write must specify one of these three The following is

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Install Tokyo Cabinet, tokyotyrant ubuntu11.04 compile Tokyo Cabinet (referred to as: TC) tokyotyrant (TT) is an error: missing bzlib.h header files. configure: error: bzlib.h is required. "TC Manual" wrote As Tokyo Cabinet depends on the follow

suffix, default output, stat, memory, grep, tt, libraries, stdlib, trilogy, tc, ansi c, data compression, tokyo, c header, c preprocessor, virtualbox, unistd, tyrant, gnu c compilerJune 18

1.ISO c 2.IEEE POSIX 3.Single UNIX Specification (XSI) 4 View system limits the function # Include <unistd.h> long sysconf (int name); long pathconf (const char * pathname, int name); long fpathconf (int filedes, int name); Example: Print all possib

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Original: http://caterpillar.onlyfun.net/Gossip/GTKGossip/GIOChannelPipe.html Use pipe, also known as anonymous pipes, it directly into the memory area for communication, its biggest limitation is the need to have parent-child relationship in the pro

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property_serice.c / * * Copyright (C) 2007 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * You may not use this file except in compliance with the License. * You may obtain a copy of the Lice

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1, pipeline and related API Application Overview 1.1 The key concepts associated pipeline <br /> pipeline is the first Linux to support a form of Unix IPC, has the following characteristics: * Pipes are half duplex, data can only flow in one directi

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How to compile? gcc-Wall-o a.out $ (mysql_config - cflags) mysql_insert.c $ (mysql_config - libs) #include <stdio.h> #include <stdlib.h> #include <string.h> #include <sys/time.h> #include <unistd.h> #include <mysql/mysql.h

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This example comes from the Internet, debugging modifications, paste the following: #include <sys/time.h> #include <sys/types.h> #include <sys/stat.h> #include <assert.h> #include <unistd.h> #include <fcntl.h> int main(

lt, stat, sys, usec, unistd, fcntl, struct timeval, keyboard ampMay 4

The following function is not buffered I / O (unbuffered I / O) function For the kernel, all opened files by the description of a non-negative integer (called a descriptor). Here's the file I / O functions: (1) open This function opens or creates a f

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The following function is non-cached I / O (unbuffered I / O) functions For the kernel, all opened files by the description of a non-negative integer (called a descriptor). Here's the file I / O functions: (1) open This function to open or create a f

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#include <stdio.h> #include <unistd.h> #include <string.h> #include <errno.h> int main(int argc, char *argv[]) { char *addr = "192.168.0.222"; if (execl("/sbin/ifconfig", "ifconfig", "eth0",

lt, 192, sbin, stdio, unistd, static ip addressApril 16

First, what is the system call in Linux world, we often encounter the term system calls, the so-called system calls is provided by the kernel function is very powerful set of functions. These system calls are implemented in the kernel, and then a cer

lt, system implementation, execution, user interface, interaction, linux system, stdio, kernel function, system call, level 3, glibc, exit function, kernel mode, unistd, kernel implementation, privilege level, privilege levels, protection mechanisms, privileged class, programming functionsMarch 22

First, some Epoll need three levels of the main lock * 1) epmutex mutex mutex * 2) ep-> mtx mutex mutex * 3) ep-> lock spin lock spinlock Need to order from 1-3. 1) the need to spin locks: because we are in charge of the poll callback method within

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http://shake863.iteye.com/blog/187085 Will address the following Linux kernel several concepts 1) process group 2) Session 3) the concept of control from the previous front end, I was just standing on the shoulders of our predecessors with the kernel

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In front, we take a recursive approach to achieve, we take another way to create multiple child processes of a process Code is as follows: #include<stdio.h> #include<stdlib.h> #include<unistd.h> /* * Creates a specified number of child p

lt, stdlib, pid, printf, stdio, int num, exit 1, child processes, perror, unistd, getpid, recursive approachFebruary 25

I believe we all know that in linux environment, the use of fork () function to create a child process, but the books are often available in the market to tell you how to create a child process, then how to create a process of multiple sub-process? W

lt, sleep, linux, stdlib, pid, printf, nonsense, stdio, int num, exit 1, int max, recursive implementation, child processes, perror, unistd, max 3, getpidFebruary 25

With SetUID or SetGID property procedures, the process of implementation can call the system call setuid () or setgid (), called after the success of this process has a file on the owner and group permissions can be completed before the change of ide

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Start a new program, replacing the original process, so this new process was implemented PID exec will not change, and as the process of calling exec function. # Include <unistd.h> int execl (const char * path, const char * arg, ...); int execlp (co

suffix, lt, error return, subroutine, stdio, fprintf, stderr, exec function, unistd, strerrorJanuary 11

2009-12-29 11:46 Pipeline in unix-like systems is a very important concept , File redirection is to use the pipeline to achieve, in the shell Also provides "|" To directly use the pipe, then C , How to use the pipeline does ? Is through the pipe

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struct sigaction{ void (*sa_handler)(int); // Before calling join signal masking characters, only when the signal capture function returns process signal mask characters will then reset to the original value */ sigset_t sa_mask; //Signal options int

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1 #include <stdio.h> #include <stdlib.h> #include <unistd.h> int main() { printf("======0========"); sleep(4); int pfds[2]; if ( pipe(pfds) == 0 ){ if ( fork() == 0 ) { close(1);// Close the write end of pipe ( In the child pro

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from [url] http://www.xxlinux.com/linux/article/development/soft/20071214/13347.html [/ url] Time :2007-12-14 11:43:26 Source: Linux compiling of the Union : dup and dup2 are also two very useful to call, their role is to copy a file descriptor. They

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Today also face a printf () does not output the case, it appears that the water is very deep, find the Internet to find, recommend the following things to you, Source Connection: http://blog.163.com/coder_jack @ 126/blog/static/341526842010497315061

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Visiting Atlanta past the open source community, saw a copy Linux / Unix command under the tac article, I feel pretty good ideas, code as follows: /* *First ,read one ,then push this line to the stack *Then ,read the next line *Until read to the end

lt, amp, parameters, stat, array, rb, stack, unix command, stdlib, printf, fopen, stdio, open source community, buf, sys, open error, unistd, getline, fcntl, malloc sizeofDecember 27

Tossing the book for a long time this question, other issues are small, and soon have been written and is stuck in the last issue of line breaks. BS, first get the complete code: #include <stdio.h> #include <stdlib.h> #include <ctype.h>

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Many readers may have a release from this series of articles began to read, until there is a lot of confusion here: Since all the new processes are created by the fork and fork generated by the parent process child process and almost exactly the same

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[Transfer] wrote # Include <fcntl.h> # Include <sys/file.h> # Include <stdlib.h> # Include <stdio.h> # Include <unistd.h> # Include <sys/types.h> # Include <sys/stat.h> # Include <dirent.h> # Include <tim

lt, amp, stat, linux, stdlib, printf, c code, stdio, argv, command c, mtime, related properties, exit 1, ld, grp, unistd, readdir, fcntl, opendir, struct direntDecember 14

[Transfer] wrote # Include <fcntl.h> # Include <sys/file.h> # Include <stdlib.h> # Include <stdio.h> # Include <unistd.h> # Include <sys/types.h> # Include <sys/stat.h> # Include <dirent.h> # Include <tim

lt, amp, stat, linux, stdlib, printf, c code, stdio, argv, command c, mtime, related properties, exit 1, ld, grp, unistd, readdir, fcntl, opendir, struct direntDecember 14

#include <unistd.h>; #include <signal.h>; #include <stdlib.h>; #include <setjmp.h>; #include <sys/signal.h>; static jmp_buf jmpbuf; void int_proc(int sig) { siglongjmp(jmpbuf, 1); } int main() { int c, i; int m; m=sigsetjmp(j

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Use getuid () / setuid () function, so that the temporary gain root privileges program code: /* * gcc -g -o test-uid test-uid.c * chown root.root ./test-uid * chmod 4755 ./test-uid * ls -al /var * */ #include<stdio.h> #include<unistd.h> #inclu

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Use getuid () / setuid () function, so that the program temporarily get root access code: /* * gcc -g -o test-uid test-uid.c * chown root.root ./test-uid * chmod 4755 ./test-uid * ls -al /var * */ #include<stdio.h> #include<unistd.h> #include&

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/ * starclient.c Procedure: LIU Xing ([email protected]) [deepfuture.javaeye.com], Last modified: 2010.10.25 Function: Text client, multi-speed slow process to resolve the problem, there is the command buffer function * / # Include <stdio.h> #

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environ Storage system environment variables, after launch will copy System environment variables to environ, defined in unistd.h In Function: char * getenv (const char *name) Function: int setenv (const char *name, const char *value, int replace) Fu

lt, c language, extern, stdio, system environment variables, unistd, access systemOctober 25

Continued with the kernel key #include <sys/types.h> #include <sys/ipc.h> key_t ftok(char *pathname, char proj) pathname filename proj project name, not 0 to return the file name corresponding to the key Open the message queue #include <sys

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# Include <stdio> # include <stdlib> # include <unistd> # include <string> int main (int argc, char * argv []) {int pipe_fd [2]; pid_t pid; char buff_r [100]; char * p_wbuf, * wdata; wdata = "Hello world"; int r_num; / /

lt, sleep, pipeline, stdlib, printf, stdio, sizeof, unistd, int pipeOctober 21

Inter-process communication (IPC) role 1. Data transmission 2. Commons 3. Notification events 4. Process Control IPC 6 way 1. Pipe (pipe), and named pipe (FIFO) 2. Signal (signal) 3. Message Queue 4. Shared Memory 5. Semaphore 6. Socket The tail pipe

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Inter-process communication (IPC) role 1 data (2) shared resources 3. Notification events 4 Process Control IPC 6 kinds of ways 1 pipe (pipe) and a named pipe (FIFO) 2 signal (signal) 3. Message Queue 4 shared memory 5. Semaphore 6 socket The tail pi

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#include<stdio.h> #include<stdlib.h> #include<unistd.h> #include<signal.h> /* Anonymous pipes application examples */ /* Define */ int temp; void handle(); void handle(){ temp=0; } main(){ int pro1; int fileDesc[2]; /* Save the dat

lt, inter process communication, stdlib, pipes, printf, stdio, unistdOctober 19

1. To obtain ID #include <sys/types.h> #include <unistd.h> pid_t getpid(void) // Gets the process ID pid_t getppid(void) // Gets the parent process ID 2. Create child process #include <unistd.h> pid_t fork(void) Called once, back twice,

lt, pid, sys, unistd, lecture notes, getpidOctober 19

#include<stdio.h> #include<stdlib.h> #include<unistd.h> #include<signal.h> /* Inter-process communication-soft interrupt signal : Parent -> Child -> Parent synchronize sequence */ /* Define */ int temp; void handle(); void ha

lt, inter process communication, sleep, stdlib, stdio, unistd, pro1, signal 12October 19