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Creates a new process, which is a copy of the parent process.

Replaces the current process image with a new program image.

Terminates the calling process and returns an exit status to the operating system.

Blocks the calling process until one of its child processes exits or receives a signal.

Creates a unidirectional communication channel between two processes.

Duplicates a file descriptor.

Sends a signal to a specific process or process group.

Returns the process ID of the calling process.

Suspends the execution of the calling thread for a specified number of seconds.

Changes the current working directory of the calling process to the specified path.

Opens a file or device, returning a file descriptor that can be used to access the file.

Attempts to read bytes from a file descriptor into a buffer.

Writes data to a file descriptor from a buffer.

Closes a file descriptor, so it no longer refers to any file and may be reused.

Changes the file permissions of a specified file or directory.

Removes a link to a file and possibly the file itself from a file system.

Returns the user ID of the calling process.

Returns the effective user ID of the calling process.

Sets the effective user ID of the calling process.

Creates a new process by duplicating the calling process.

Attaches a file system to a specified directory, making it accessible to the process.

Detaches a file system from the directory tree, making it inaccessible to the process.

Provides a device-specific command interface to hardware devices.

Reads several directory entries from a directory file descriptor.