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

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

Writes data to a file descriptor from a buffer.

Sets the effective user ID of the calling process.

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

Reads several directory entries from a directory file descriptor.

Sends a signal to a specific process or process group.

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

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

Returns the user ID of the calling process.

Returns the effective user ID of the calling process.

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

Duplicates a file descriptor.

Provides a device-specific command interface to hardware devices.

Replaces the current process image with a new program image.

Creates a new process by duplicating the calling process.

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

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

Returns the process ID of the calling process.

Changes the file permissions of a specified file or directory.

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

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

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

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