FORK(2)

fork - create a child process

SYNOPSIS

       #include <unistd.h>

       pid_t fork(void);

What child process does not inherit from parent

The child process is an exact duplicate of the parent process except for the following points:

NOTE:

原文介绍了各种child process不会从parent继承的"process attribute"

The process attributes in the preceding list are all specified in POSIX.1. The parent and child also differ with respect to the following Linux-specific process attributes:

NOTE:

下面都是"Linux-specific process attributes"

Details

NOTE:

一些细节

Note the following further points:

RETURN VALUE

On success, the PID of the child process is returned in the parent, and 0 is returned in the child. On failure, -1 is returned in the parent, no child process is created, and errno is set to indicate the error.

ERRORS

NOTES

Under Linux, fork() is implemented using copy-on-write pages.