unix signal 15

Signal is a very important part of Linux programming, this article will detail the basic concept of signal mechanism, the approximate realization method of Linux to signal mechanism, how to use signal, and several system calls about signal.Signal

A signal (signal) is a software interrupt that provides a way to handle asynchronous events and is the only asynchronous communication between processes. In a Linux system, the subsequent signaling mechanism is extended according to the POSIX

1. Daemon list AMD: Automatic Installation of NFS (Network File System) Guard process apmd: Advanced Power governance arpwatch: record logs and build an ethernet address and IP address on the LAN interface to the database autofs: automatic

signal and its processing signal processing is an event that UNIX and Linux systems generate in response to certain conditions, usually the kernel generates a signal, and the process receives a signal and takes action accordingly .For example,

A signal is a software interrupt, an asynchronous communication method that handles an asynchronous event. For example, we run the program in the terminal, by pressing the keyboard "CTRL + C", you can send a SIGINT interrupt signal to stop the

Signal (signals)A signal is a soft interrupt and is a method of handling asynchronous events. In general, the operating system supports many signals. In particular, UNIX, a more important application typically processes signals. UNIX defines a

Signal System Function calls provide a simple example. However, the C prototype Declaration makes it look more complex than the actual one. The signal function associates a given function with a specific signal. Here is the definition in FreeBSD

1. sighup SignalIn UNIX, the process organization structure is session. It contains one foreground process group and one or more background process groups. A process group contains multiple processes. A session may have a session first process, and

$ kill -l1) SIGHUP 2) SIGINT 3) SIGQUIT 4) SIGILL5) SIGTRAP 6) SIGABRT 7) SIGBUS 8) SIGFPE9) SIGKILL 10) SIGUSR1 11) SIGSEGV 12) SIGUSR213) SIGPIPE 14) SIGALRM 15) SIGTERM 16) SIGSTKFLT 17)

From: http://www.dbafree.net /? P = 870 We can use kill-L to view all the semaphore interpretations, but we cannot see the signal 0 interpretations. [root@testdb~]# kill -l 1) SIGHUP 2) SIGINT 3) SIGQUIT 4) SIGILL 5) SIGTRAP 6)