getpass - read string of characters without echo

Syntax	#include <unistd.h> char *getpass(const char *prompt);
Description	getpass() performs the following actions. It opens the process ́ controlling terminal, writes the null-terminated string prompt to that device, disables echoing, reads a string of characters up to the next newline character or EOF, restores the terminal state, and closes the special file for the terminal.
Return val.	Next option character from the command line
		upon successful completion. The return value consists of at most {PASS_MAX} bytes that were read from the terminal device..
	Null pointer	if an error occurs. The original state of the terminal is restored, and errno is set to indicate the error.
Errors	getpass() will fail if:
	EINTR	getpass() was interrupted by a signal.
	EIO	The process is a member of a background process attempting to read from its controlling terminal; the process is ignoring or blocking the SIGTTIN signal or the process group is orphaned.
	EMFILE	{OPEN_MAX} file descriptors are currently open in the calling process.
	ENFILE	The maximum allowable number of files is currently open in the system.
	ENXIO	The process does not have a controlling terminal.
Notes	The return value points to static data whose content may be overwritten by each call. pclose() is executed only for POSIX files. getpass() is not thread-safe. Will no longer be supported by the X/Open-Standard in future.
See also	limits.h, unistd.h.