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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
In Linux, a signal is a way of communicating between processes, and it uses an asynchronous mechanism. When the signal is sent to a process, the operating system interrupts the normal process of the process and enters the appropriate signal handler
1, the process of independence and collaborationWhen the process runs in the operating system, each process is highly independent and closed! But some program problems require multiple processes to collaborate. At this time there is a
The concept of the signal
Signal (signal)--the way communication between processes is a software outage. Once a process receives a signal, it interrupts the original program execution process to process the signal.
Several common signals:
SIGINT
Signal, signal Korean DramaBasic concepts of signals:Each signal has a number and a macro definition name, which can be found in signal. h. Run the kill-l command to view the signal list defined in the system: 1-31 is a common signal; 34-64 is a
To execute a command every minute in the liunx system, the most common method is crontab. if you do not want to use crontab, the most common way to execute a command every minute in the liunx system is to use a timer. if you do not want to use
In the LIUNX system in order to execute a command every minute, the most common way is crontab, if you do not want to use Crontab, with colleagues in the program can use the timer to achieve this function, so began to grope, found that need some
This article mainly introduces the use of the signal package in Python, and mainly performs operations on process signals in Linux, if you want to execute a command every minute in the liunx system, the most common method is crontab. If you do not
In the LIUNX system in order to execute a command every minute, the most common way is crontab, if you do not want to use Crontab, with colleagues in the program can use the timer to achieve this function, so began to grope, found that need some
Transferred from: http://www.jb51.net/article/74844.htmIn the LIUNX system in order to execute a command every minute, the most common way is crontab, if you do not want to use Crontab, with colleagues in the program can use the timer to achieve
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