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Creates a unidirectional communication channel between two processes.

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

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

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

Returns the process ID of the calling process.

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

Writes data to a file descriptor from a buffer.

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

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.

Returns the user ID of the calling process.

Sends a signal to a specific process or process group.

Returns the effective user ID of the calling process.

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

Reads several directory entries from a directory file descriptor.

Duplicates a file descriptor.

Sets the effective user ID of the calling process.

Provides a device-specific command interface to hardware devices.

Creates a new process by duplicating the calling process.

Allows a program to monitor multiple file descriptors, waiting for one or more of the file descriptors to become 'ready'.

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

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

Replaces the current process image with a new program image.

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