process signal

System environment:CentOS 6.5/7.0 x86_64Fedora x86_64Download PHP Source Package# wget HTTP://CN2.PHP.NET/DISTRIBUTIONS/PHP-5.5.15.TAR.BZ2# Tar XF php-5.5.15.tar.bz2-c/usr/local/src/Add Epel Source# RPM-UVH http://dl.fedoraproject.org/pub/epel/6/x86_

First,Linux five restart command　　1, shutdown　　2, Poweroff　　3. Init　　4, reboot　　5, haltIi. Specific instructions for five restart commandsShutdownRebootIn Linux, some common shutdown/restart commands have shutdown, halt, reboot, and INIT, they can

Nameless Pipe (pipe): A pipe is a half-duplex mode of communication in which data can only flow in one direction and can only be used between processes that have affinity. A process's affinity usually refers to a parent-child process relationship.

We already know that we can terminate the process by signal, or through the signal to communicate between processes, the program can also specify the signal's associated processing function to change the signal's default processing mode, you can

1: Create file: Touch file nameThe touch command can also change the access time and modification time of an existing file without changing the contents of the file.Change modification time only touch-m file nameChange access time only touch-a file

/** Title: * Program, to achieve the following functions: The parent process to create sub-process 1 and child process 2, child process 1 to send a reliable signal to the child process 2, and transmit additional data for the child process 1 pid*2,

Test environment feedback from a department before a section Tomcat will exit unexpectedly, we found that the actual environment is not the JVM crash, the log has a process to destroy the record, from pause to destory the entire

We can use Kill-l to see all the semaphore interpretations, but we don't see the explanation for signal 0.[[Email protected]~]# kill-l 1] SIGHUP 2) SIGINT 3) sigquit 4) Sigill 5) SIGTRAP 6) SIGABRT 7) Sigbus SIGFPE 9)

System calls bridge the kernel and user spaceAll code runs in the processProcess has identity PID parent process PpidEverything is a file.The file descriptor exists only in the open process, which means that a resource that has already been opened

Blog gradually migrated to, independent blog, the original address http://www.woniubi.cn/two_groups_signal_difference/Before looking at the signal, there is not much attention to the comparison of different signals. When I see it again today, I

We can use Kill-l to see all the semaphore interpretations, but we don't see the explanation for signal 0.[[Email protected]~]# kill-l 1] SIGHUP 2) SIGINT 3) sigquit 4) Sigill 5) SIGTRAP 6) SIGABRT 7) Sigbus SIGFPE 9)

Process exitThe process end indicates that the process is about to end, and the process exit methods in the Linux system are divided into normal exit and exception exit.Exit functionThe process has three normal termination methods and two kinds of

ProcessThreadCommunication (native, network)The properties and concepts of the process:What is the difference between a process and a program:1 The process is dynamic2 The program is staticReadelf-a name Read all the contents of the programFile

Cat  /etc/passwd   All system user accounts list and basic information for each user cat/etc/meminfo the current state of the virtual memory ipcs-m   View the Shared memory page on the current system  [[email  protected]~] #当前shell的用户名, current

muge0913Link: Linux c sigprocmask blocking process1, sometimes do not want to receive the signal immediately stop the current execution, to deal with the signal, but also do not want to ignore the signal, but delay a period of time to call the

Nginx Inter-process communicationinter-process message deliveryShared Memoryshared memory is also the most important inter-process communication method available under Linux, which creates a contiguous linear address space in memory through MMAP and

# # # #1. Process Definition # # #Process is the work that the CPU does not complete# # # #2. PS Command # # #PsA # #关于当前环境的所有进程X| -A # #所有进程F # #显示进程从属关系E # #显示进程调用环境工具的详细信息L # #长列表显示进程的详细信息U # #显示进程的用户信息-A # #显示shell前台运行命令的进程 but does not

# # # #1. Process Definition # # #Process is the work that the CPU does not complete# # # #2. PS Command # # #PsA # #关于当前环境的所有进程X| -A # #所有进程F # #显示进程从属关系E # #显示进程调用环境工具的详细信息L # #长列表显示进程的详细信息U # #显示进程的用户信息-A # #显示shell前台运行命令的进程 but does not

1. Process definitionProcess is the work that the CPU does not complete2.ps commandPsl long format output;U displays the process in the order of the user name and start time;J Use the task format to display the process;F to display the process in a

What is a zombie process ?First the kernel releases all the stores used by the terminating process (called the exit system call), closes all open files, and so on, but the kernel holds a certain amount of information for each terminating child