sigchld handler

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

Often confusing two signals are SIGCLD and SIGCHLD, the signal SIGCLD originated from system V, the meaning of the signal and from the BSD signal sigchld inconsistent. The posix.1 signal is also known as SIGCHLD. The semantics of the signal sigchld

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

The two signals that are often obfuscated are sigcld and sigchld. The signal sigcld is derived from System V. The meaning of the signal is different from that of the signal sigchld originating from BSD. Posix.1 signal is also called sigchld. the

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

1. What is a zombie process? The zombie, defunct, PS, and top commands of zombie processes can be seen. It refers to a process in the "zombie" state. Such a process is dead, but it is still stored in some way. It is said that it has died because

Once, it was tortured by the system () function, because the system () function was not well understood. Simply knowing that using this function to execute a system command is not enough, it is not sufficient, its return value, the return value of

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

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

Once, it was tortured by the system () function, because the system () function was not well understood. Simply knowing that using this function to execute a system command is not enough, it is not sufficient, its return value, the return value of