The difference between a process in Linux and exit Return and exit () gracefully

exit is a function that has parameters. void exit (int status). leave control to the system after exit executes.

Return is returned after the function has finished executing. After the return executes, give control to the calling function. return ()is the current function return. if it is in the main functionMain,naturally it will end the current process, if not, that is to return to the previous layer of the call. When multiple processes are in progress.If you sometimes want to detect whether the process exits gracefully.it is necessary to use the return value of the last process, and so on.

Return is the language level, which represents the return of the call stack, and exit is the system call level, which represents the end of a process.

In the main function, return (0) and exit (0) are the same, and the child function returns with return, while the child process exits with exit, calls a termination handler when the exit is called, and then closes all I/O streams.

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The difference between a process in Linux and exit Return and exit () gracefully