sigchld handler example

Overview This article mainly describes the process of Linux under the relevant operations, and later will write an article on the Linux thread operation. These two articles and I have to finish an article (IPC communication under Linux) to form a

To do a simple back-firing server:The client reads a line of text from the standard input, writes it to the server, reads the text from the network input, and returns it to the customer, and the customer reads the text back from the network input

1. Signal pending and blocking"Signal status: The "pending" Status of the signal refers to the period from the generation of the signal to the time before the signal is processed. The "blocking" Status of the signal is a switching action, it

These days tuning program (embedded Linux), the discovery program sometimes inexplicably die, each time is located in the program in the different system () function, directly under the shell Input system () function called in the command is also

Android--process of signal processing for INIT processIn Android, when a process exits (exit), a SIGCHLD signal is sent to its parent process. When the parent process receives the signal, the system resources assigned to the child process are freed,

1. Basic Knowledge Consolidation1.1 interrupts fall into two categories:A) hard interrupt, which is usually said interrupt, interrupt handler running in the kernel state, need some hardware support;b) Soft interrupt, is a simulation of the interrupt

The function sigaction allows us to obtain or modify (or acquire and modify) a handler function associated with a particular signal, which replaces the function signal in the earlier version of the UNIX system, and in fact, at the end of this

The function sigaction allows us to obtain or modify (or acquire and modify) a handler function associated with a particular signal, which replaces the function signal in the earlier version of the UNIX system, and in fact, at the end of this

PHP has a set of process control functions (enable-pcntl and posix extensions are required during compilation ), this allows php to create sub-processes, execute programs using exec functions, and process signals in * nix systems like c. PCNTL uses

This article describes the differences and relationships between wait and waitpid. To avoid zombie processes, the main process needs to wait for the sub-process to return no matter when we create a sub-process, so that the sub-process can be cleaned