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When a process calls fork, it is deemed the parent process and the newly created process is its child. After the fork, both processes not only run the same program, but they resume execution as though both had called the system call. They can then inspect the call's return value to determine their status, child or parent, and act accordingly.
The spawn() family of functions declared in process.h can replace it in cases where the call to fork() is followed directly by exec(). When a fork syscall is made on WSL, lxss.sys does some of the initial work to prepare for copying the process. It then calls internal NT APIs to create the process with the correct semantics and create a thread ...
A high-level overview of the Linux kernel's system call interface, which handles communication between its various components and the userspace. In computing, a system call (commonly abbreviated to syscall) is the programmatic way in which a computer program requests a service from the operating system [a] on which it is executed.
For instance, this includes Unix and Unix-like operating systems, such as GNU variants, distributions of Linux and BSD, and macOS, and compilers such as GCC and LLVM. On Unix-like systems, the interface defined by unistd.h is typically made up largely of system call wrapper functions such as fork, pipe and I/O primitives (read, write, close, etc.).
Linux 2.6 kernels adhere to this behavior, and FreeBSD supports both of these methods since version 5.0. [5] However, because of historical differences between System V and BSD behaviors with regard to ignoring SIGCHLD, calling wait remains the most portable paradigm for cleaning up after forked child processes.
Added support for subpage_prot POWER-specific syscall on Linux 4.5.17: 21 July 2008-F flag is deprecated, as -f traces vfork on Linux since long time 4.5.16: 3 August 2007: 4.5.15: 16 January 2007: Added support for new *at, inotify*, pselect6, ppoll and unshare syscalls on Linux 4.5.14: 16 January 2007: System call number can be supplied in -e ...
μClinux is a variation of the Linux kernel, previously maintained as a fork, that targets microcontrollers without a memory management unit (MMU). [1] It was integrated into the mainline kernel as of 2.5.46; [ 2 ] the project continues to develop patches and tools for microcontrollers.
The fork and execve functions in glibc are examples of this. They call the lower-level fork and execve system calls, respectively. This may lead to incorrectly using the terms "system call" and "syscall" to refer to higher-level library calls rather than the similarly named system calls, which they wrap. [4] [5]